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chromium / external / github.com / git / git / refs/tags/v2.6.0-rc0 / . / refs.c
blob: 4e15f60d98ea8affdef226bce199935fa694b195 [file] [log] [blame]
Daniel Barkalow95fc7512005-06-06 20:31:29[diff] [blame]1#include "cache.h"
Michael Haggerty697cc8e2014-10-01 10:28:42[diff] [blame]2#include "lockfile.h"
Junio C Hamano85023572006-12-19 22:34:12[diff] [blame]3#include "refs.h"
Junio C Hamanocf0adba2006-11-19 21:22:44[diff] [blame]4#include "object.h"
5#include "tag.h"
Johannes Schindelin7155b722007-09-28 15:28:54[diff] [blame]6#include "dir.h"
Junio C Hamanodaebaa72013-01-19 00:08:30[diff] [blame]7#include "string-list.h"
Daniel Barkalow95fc7512005-06-06 20:31:29[diff] [blame]8
Stefan Beller3581d792014-12-12 08:57:02[diff] [blame]9struct ref_lock {
10 char *ref_name;
11 char *orig_ref_name;
12 struct lock_file *lk;
Michael Haggerty5cb901a2015-05-25 18:39:22[diff] [blame]13 struct object_id old_oid;
Stefan Beller3581d792014-12-12 08:57:02[diff] [blame]14};
15
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]16/*
David Turnerdde8a902014-06-04 03:38:10[diff] [blame]17 * How to handle various characters in refnames:
18 * 0: An acceptable character for refs
Junio C Hamano5e650222014-07-28 17:41:53[diff] [blame]19 * 1: End-of-component
20 * 2: ., look for a preceding . to reject .. in refs
21 * 3: {, look for a preceding @ to reject @{ in refs
Jacob Keller53a85552015-07-22 21:05:32[diff] [blame]22 * 4: A bad character: ASCII control characters, and
Jacob Kellercd377f42015-07-22 21:05:33[diff] [blame]23 * ":", "?", "[", "\", "^", "~", SP, or TAB
24 * 5: *, reject unless REFNAME_REFSPEC_PATTERN is set
David Turnerdde8a902014-06-04 03:38:10[diff] [blame]25 */
26static unsigned char refname_disposition[256] = {
Junio C Hamano5e650222014-07-28 17:41:53[diff] [blame]27 1, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
28 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
Jacob Kellercd377f42015-07-22 21:05:33[diff] [blame]29 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 2, 1,
Junio C Hamano5e650222014-07-28 17:41:53[diff] [blame]30 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 4,
David Turnerdde8a902014-06-04 03:38:10[diff] [blame]31 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Junio C Hamano5e650222014-07-28 17:41:53[diff] [blame]32 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 4, 0, 4, 0,
33 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
34 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 4, 4
David Turnerdde8a902014-06-04 03:38:10[diff] [blame]35};
36
37/*
Michael Haggerty581d4e02015-02-12 11:12:12[diff] [blame]38 * Flag passed to lock_ref_sha1_basic() telling it to tolerate broken
39 * refs (i.e., because the reference is about to be deleted anyway).
40 */
41#define REF_DELETING 0x02
42
43/*
Michael Haggerty8df4e512015-02-17 17:00:14[diff] [blame]44 * Used as a flag in ref_update::flags when a loose ref is being
Ronnie Sahlberg029cdb42014-04-30 16:03:36[diff] [blame]45 * pruned.
46 */
Michael Haggerty31e79f02015-02-12 11:12:13[diff] [blame]47#define REF_ISPRUNING 0x04
48
Ronnie Sahlberg029cdb42014-04-30 16:03:36[diff] [blame]49/*
Michael Haggerty16180332015-02-17 17:00:21[diff] [blame]50 * Used as a flag in ref_update::flags when the reference should be
51 * updated to new_sha1.
52 */
53#define REF_HAVE_NEW 0x08
54
55/*
Michael Haggerty8df4e512015-02-17 17:00:14[diff] [blame]56 * Used as a flag in ref_update::flags when old_sha1 should be
57 * checked.
58 */
Michael Haggerty16180332015-02-17 17:00:21[diff] [blame]59#define REF_HAVE_OLD 0x10
Michael Haggerty8df4e512015-02-17 17:00:14[diff] [blame]60
61/*
Michael Haggertycf018ee2015-04-24 11:35:49[diff] [blame]62 * Used as a flag in ref_update::flags when the lockfile needs to be
63 * committed.
64 */
65#define REF_NEEDS_COMMIT 0x20
66
67/*
David Turner0f2a71d2015-07-21 21:04:54[diff] [blame]68 * 0x40 is REF_FORCE_CREATE_REFLOG, so skip it if you're adding a
69 * value to ref_update::flags
70 */
71
72/*
David Turnerdde8a902014-06-04 03:38:10[diff] [blame]73 * Try to read one refname component from the front of refname.
74 * Return the length of the component found, or -1 if the component is
75 * not legal. It is legal if it is something reasonable to have under
76 * ".git/refs/"; We do not like it if:
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]77 *
78 * - any path component of it begins with ".", or
79 * - it has double dots "..", or
Jacob Keller53a85552015-07-22 21:05:32[diff] [blame]80 * - it has ASCII control characters, or
Jacob Kellercd377f42015-07-22 21:05:33[diff] [blame]81 * - it has ":", "?", "[", "\", "^", "~", SP, or TAB anywhere, or
82 * - it has "*" anywhere unless REFNAME_REFSPEC_PATTERN is set, or
Jacob Keller53a85552015-07-22 21:05:32[diff] [blame]83 * - it ends with a "/", or
84 * - it ends with ".lock", or
85 * - it contains a "@{" portion
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]86 */
Jacob Kellercd377f42015-07-22 21:05:33[diff] [blame]87static int check_refname_component(const char *refname, int *flags)
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]88{
89 const char *cp;
90 char last = '\0';
91
92 for (cp = refname; ; cp++) {
David Turnerdde8a902014-06-04 03:38:10[diff] [blame]93 int ch = *cp & 255;
94 unsigned char disp = refname_disposition[ch];
95 switch (disp) {
Junio C Hamano5e650222014-07-28 17:41:53[diff] [blame]96 case 1:
David Turnerdde8a902014-06-04 03:38:10[diff] [blame]97 goto out;
Junio C Hamano5e650222014-07-28 17:41:53[diff] [blame]98 case 2:
David Turnerdde8a902014-06-04 03:38:10[diff] [blame]99 if (last == '.')
100 return -1; /* Refname contains "..". */
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]101 break;
Junio C Hamano5e650222014-07-28 17:41:53[diff] [blame]102 case 3:
David Turnerdde8a902014-06-04 03:38:10[diff] [blame]103 if (last == '@')
104 return -1; /* Refname contains "@{". */
105 break;
Junio C Hamano5e650222014-07-28 17:41:53[diff] [blame]106 case 4:
David Turnerdde8a902014-06-04 03:38:10[diff] [blame]107 return -1;
Jacob Kellercd377f42015-07-22 21:05:33[diff] [blame]108 case 5:
109 if (!(*flags & REFNAME_REFSPEC_PATTERN))
110 return -1; /* refspec can't be a pattern */
111
112 /*
113 * Unset the pattern flag so that we only accept
114 * a single asterisk for one side of refspec.
115 */
116 *flags &= ~ REFNAME_REFSPEC_PATTERN;
117 break;
David Turnerdde8a902014-06-04 03:38:10[diff] [blame]118 }
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]119 last = ch;
120 }
David Turnerdde8a902014-06-04 03:38:10[diff] [blame]121out:
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]122 if (cp == refname)
Michael Haggertydac529e2012-04-10 05:30:22[diff] [blame]123 return 0; /* Component has zero length. */
Jonathan Niederf3cc52d2014-09-26 19:22:22[diff] [blame]124 if (refname[0] == '.')
125 return -1; /* Component starts with '.'. */
Michael Haggerty7108ad22014-10-01 10:28:15[diff] [blame]126 if (cp - refname >= LOCK_SUFFIX_LEN &&
127 !memcmp(cp - LOCK_SUFFIX_LEN, LOCK_SUFFIX, LOCK_SUFFIX_LEN))
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]128 return -1; /* Refname ends with ".lock". */
129 return cp - refname;
130}
131
Junio C Hamano5e650222014-07-28 17:41:53[diff] [blame]132int check_refname_format(const char *refname, int flags)
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]133{
134 int component_len, component_count = 0;
135
Felipe Contreras9ba89f42013-09-02 06:34:30[diff] [blame]136 if (!strcmp(refname, "@"))
137 /* Refname is a single character '@'. */
138 return -1;
139
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]140 while (1) {
141 /* We are at the start of a path component. */
Jacob Kellercd377f42015-07-22 21:05:33[diff] [blame]142 component_len = check_refname_component(refname, &flags);
143 if (component_len <= 0)
144 return -1;
145
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]146 component_count++;
147 if (refname[component_len] == '\0')
148 break;
149 /* Skip to next component. */
150 refname += component_len + 1;
151 }
152
153 if (refname[component_len - 1] == '.')
154 return -1; /* Refname ends with '.'. */
155 if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2)
156 return -1; /* Refname has only one component. */
157 return 0;
158}
159
160struct ref_entry;
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]161
Michael Haggerty28e6a342012-04-26 22:27:07[diff] [blame]162/*
163 * Information used (along with the information in ref_entry) to
164 * describe a single cached reference. This data structure only
165 * occurs embedded in a union in struct ref_entry, and only when
166 * (ref_entry->flag & REF_DIR) is zero.
167 */
Michael Haggerty593f1bb2012-04-10 05:30:23[diff] [blame]168struct ref_value {
Michael Haggerty6c6f58d2013-04-14 12:54:17[diff] [blame]169 /*
170 * The name of the object to which this reference resolves
171 * (which may be a tag object). If REF_ISBROKEN, this is
172 * null. If REF_ISSYMREF, then this is the name of the object
173 * referred to by the last reference in the symlink chain.
174 */
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]175 struct object_id oid;
Michael Haggerty6c6f58d2013-04-14 12:54:17[diff] [blame]176
177 /*
178 * If REF_KNOWS_PEELED, then this field holds the peeled value
179 * of this reference, or null if the reference is known not to
Michael Haggerty2312a792013-04-22 19:52:21[diff] [blame]180 * be peelable. See the documentation for peel_ref() for an
181 * exact definition of "peelable".
Michael Haggerty6c6f58d2013-04-14 12:54:17[diff] [blame]182 */
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]183 struct object_id peeled;
Michael Haggerty593f1bb2012-04-10 05:30:23[diff] [blame]184};
185
Michael Haggertyf006c422012-04-26 22:27:05[diff] [blame]186struct ref_cache;
187
Michael Haggerty28e6a342012-04-26 22:27:07[diff] [blame]188/*
189 * Information used (along with the information in ref_entry) to
190 * describe a level in the hierarchy of references. This data
191 * structure only occurs embedded in a union in struct ref_entry, and
192 * only when (ref_entry.flag & REF_DIR) is set. In that case,
193 * (ref_entry.flag & REF_INCOMPLETE) determines whether the references
194 * in the directory have already been read:
195 *
196 * (ref_entry.flag & REF_INCOMPLETE) unset -- a directory of loose
197 * or packed references, already read.
198 *
199 * (ref_entry.flag & REF_INCOMPLETE) set -- a directory of loose
200 * references that hasn't been read yet (nor has any of its
201 * subdirectories).
202 *
203 * Entries within a directory are stored within a growable array of
204 * pointers to ref_entries (entries, nr, alloc). Entries 0 <= i <
205 * sorted are sorted by their component name in strcmp() order and the
206 * remaining entries are unsorted.
207 *
208 * Loose references are read lazily, one directory at a time. When a
209 * directory of loose references is read, then all of the references
210 * in that directory are stored, and REF_INCOMPLETE stubs are created
211 * for any subdirectories, but the subdirectories themselves are not
212 * read. The reading is triggered by get_ref_dir().
213 */
Michael Haggertyd3177272012-04-10 05:30:24[diff] [blame]214struct ref_dir {
Julian Phillipse9c4c112011-09-29 22:11:42[diff] [blame]215 int nr, alloc;
Michael Haggertye6ed3ca2012-01-17 05:50:32[diff] [blame]216
217 /*
218 * Entries with index 0 <= i < sorted are sorted by name. New
219 * entries are appended to the list unsorted, and are sorted
220 * only when required; thus we avoid the need to sort the list
221 * after the addition of every reference.
222 */
223 int sorted;
224
Michael Haggertyf006c422012-04-26 22:27:05[diff] [blame]225 /* A pointer to the ref_cache that contains this ref_dir. */
226 struct ref_cache *ref_cache;
227
Michael Haggertyd3177272012-04-10 05:30:24[diff] [blame]228 struct ref_entry **entries;
Julian Phillipse9c4c112011-09-29 22:11:42[diff] [blame]229};
230
Michael Haggerty89df9c82013-04-14 12:54:16[diff] [blame]231/*
232 * Bit values for ref_entry::flag. REF_ISSYMREF=0x01,
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]233 * REF_ISPACKED=0x02, REF_ISBROKEN=0x04 and REF_BAD_NAME=0x08 are
234 * public values; see refs.h.
Michael Haggerty89df9c82013-04-14 12:54:16[diff] [blame]235 */
236
237/*
238 * The field ref_entry->u.value.peeled of this value entry contains
239 * the correct peeled value for the reference, which might be
240 * null_sha1 if the reference is not a tag or if it is broken.
241 */
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]242#define REF_KNOWS_PEELED 0x10
Michael Haggerty28e6a342012-04-26 22:27:07[diff] [blame]243
244/* ref_entry represents a directory of references */
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]245#define REF_DIR 0x20
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]246
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]247/*
Michael Haggerty28e6a342012-04-26 22:27:07[diff] [blame]248 * Entry has not yet been read from disk (used only for REF_DIR
249 * entries representing loose references)
250 */
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]251#define REF_INCOMPLETE 0x40
Michael Haggerty28e6a342012-04-26 22:27:07[diff] [blame]252
253/*
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]254 * A ref_entry represents either a reference or a "subdirectory" of
Michael Haggerty28e6a342012-04-26 22:27:07[diff] [blame]255 * references.
256 *
257 * Each directory in the reference namespace is represented by a
258 * ref_entry with (flags & REF_DIR) set and containing a subdir member
259 * that holds the entries in that directory that have been read so
260 * far. If (flags & REF_INCOMPLETE) is set, then the directory and
261 * its subdirectories haven't been read yet. REF_INCOMPLETE is only
262 * used for loose reference directories.
263 *
264 * References are represented by a ref_entry with (flags & REF_DIR)
265 * unset and a value member that describes the reference's value. The
266 * flag member is at the ref_entry level, but it is also needed to
267 * interpret the contents of the value field (in other words, a
268 * ref_value object is not very much use without the enclosing
269 * ref_entry).
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]270 *
271 * Reference names cannot end with slash and directories' names are
272 * always stored with a trailing slash (except for the top-level
273 * directory, which is always denoted by ""). This has two nice
274 * consequences: (1) when the entries in each subdir are sorted
275 * lexicographically by name (as they usually are), the references in
276 * a whole tree can be generated in lexicographic order by traversing
277 * the tree in left-to-right, depth-first order; (2) the names of
278 * references and subdirectories cannot conflict, and therefore the
279 * presence of an empty subdirectory does not block the creation of a
280 * similarly-named reference. (The fact that reference names with the
281 * same leading components can conflict *with each other* is a
Michael Haggerty5baf37d2015-05-11 15:25:13[diff] [blame]282 * separate issue that is regulated by verify_refname_available().)
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]283 *
284 * Please note that the name field contains the fully-qualified
285 * reference (or subdirectory) name. Space could be saved by only
286 * storing the relative names. But that would require the full names
287 * to be generated on the fly when iterating in do_for_each_ref(), and
288 * would break callback functions, who have always been able to assume
289 * that the name strings that they are passed will not be freed during
290 * the iteration.
291 */
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]292struct ref_entry {
293 unsigned char flag; /* ISSYMREF? ISPACKED? */
Michael Haggerty593f1bb2012-04-10 05:30:23[diff] [blame]294 union {
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]295 struct ref_value value; /* if not (flags&REF_DIR) */
296 struct ref_dir subdir; /* if (flags&REF_DIR) */
Michael Haggerty593f1bb2012-04-10 05:30:23[diff] [blame]297 } u;
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]298 /*
299 * The full name of the reference (e.g., "refs/heads/master")
300 * or the full name of the directory with a trailing slash
301 * (e.g., "refs/heads/"):
302 */
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]303 char name[FLEX_ARRAY];
304};
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]305
Michael Haggerty28e6a342012-04-26 22:27:07[diff] [blame]306static void read_loose_refs(const char *dirname, struct ref_dir *dir);
307
Michael Haggertyd7826d52012-04-26 22:27:03[diff] [blame]308static struct ref_dir *get_ref_dir(struct ref_entry *entry)
309{
Michael Haggerty28e6a342012-04-26 22:27:07[diff] [blame]310 struct ref_dir *dir;
Michael Haggertyd7826d52012-04-26 22:27:03[diff] [blame]311 assert(entry->flag & REF_DIR);
Michael Haggerty28e6a342012-04-26 22:27:07[diff] [blame]312 dir = &entry->u.subdir;
313 if (entry->flag & REF_INCOMPLETE) {
314 read_loose_refs(entry->name, dir);
315 entry->flag &= ~REF_INCOMPLETE;
316 }
317 return dir;
Michael Haggertyd7826d52012-04-26 22:27:03[diff] [blame]318}
319
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]320/*
321 * Check if a refname is safe.
322 * For refs that start with "refs/" we consider it safe as long they do
323 * not try to resolve to outside of refs/.
324 *
325 * For all other refs we only consider them safe iff they only contain
326 * upper case characters and '_' (like "HEAD" AND "MERGE_HEAD", and not like
327 * "config").
328 */
329static int refname_is_safe(const char *refname)
330{
331 if (starts_with(refname, "refs/")) {
332 char *buf;
333 int result;
334
335 buf = xmalloc(strlen(refname) + 1);
336 /*
337 * Does the refname try to escape refs/?
338 * For example: refs/foo/../bar is safe but refs/foo/../../bar
339 * is not.
340 */
341 result = !normalize_path_copy(buf, refname + strlen("refs/"));
342 free(buf);
343 return result;
344 }
345 while (*refname) {
346 if (!isupper(*refname) && *refname != '_')
347 return 0;
348 refname++;
349 }
350 return 1;
351}
352
Michael Haggertycddc4252011-12-12 05:38:22[diff] [blame]353static struct ref_entry *create_ref_entry(const char *refname,
354 const unsigned char *sha1, int flag,
355 int check_name)
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]356{
357 int len;
Michael Haggertycddc4252011-12-12 05:38:22[diff] [blame]358 struct ref_entry *ref;
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]359
Junio C Hamano09116a12011-11-17 00:54:32[diff] [blame]360 if (check_name &&
Jonathan Niederf3cc52d2014-09-26 19:22:22[diff] [blame]361 check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]362 die("Reference has invalid format: '%s'", refname);
Michael Haggertycddc4252011-12-12 05:38:22[diff] [blame]363 len = strlen(refname) + 1;
364 ref = xmalloc(sizeof(struct ref_entry) + len);
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]365 hashcpy(ref->u.value.oid.hash, sha1);
366 oidclr(&ref->u.value.peeled);
Michael Haggertycddc4252011-12-12 05:38:22[diff] [blame]367 memcpy(ref->name, refname, len);
368 ref->flag = flag;
369 return ref;
370}
371
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]372static void clear_ref_dir(struct ref_dir *dir);
373
Michael Haggerty732134e2012-04-10 05:30:21[diff] [blame]374static void free_ref_entry(struct ref_entry *entry)
375{
Michael Haggerty27b55872012-05-20 06:49:32[diff] [blame]376 if (entry->flag & REF_DIR) {
377 /*
378 * Do not use get_ref_dir() here, as that might
379 * trigger the reading of loose refs.
380 */
381 clear_ref_dir(&entry->u.subdir);
382 }
Michael Haggerty732134e2012-04-10 05:30:21[diff] [blame]383 free(entry);
384}
385
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]386/*
387 * Add a ref_entry to the end of dir (unsorted). Entry is always
388 * stored directly in dir; no recursion into subdirectories is
389 * done.
390 */
391static void add_entry_to_dir(struct ref_dir *dir, struct ref_entry *entry)
Michael Haggertycddc4252011-12-12 05:38:22[diff] [blame]392{
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]393 ALLOC_GROW(dir->entries, dir->nr + 1, dir->alloc);
394 dir->entries[dir->nr++] = entry;
Michael Haggerty654ad402012-05-24 12:16:50[diff] [blame]395 /* optimize for the case that entries are added in order */
396 if (dir->nr == 1 ||
397 (dir->nr == dir->sorted + 1 &&
398 strcmp(dir->entries[dir->nr - 2]->name,
399 dir->entries[dir->nr - 1]->name) < 0))
400 dir->sorted = dir->nr;
Julian Phillipsc774aab2007-04-17 01:42:50[diff] [blame]401}
402
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]403/*
404 * Clear and free all entries in dir, recursively.
405 */
Michael Haggertyd3177272012-04-10 05:30:24[diff] [blame]406static void clear_ref_dir(struct ref_dir *dir)
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]407{
408 int i;
Michael Haggertyd3177272012-04-10 05:30:24[diff] [blame]409 for (i = 0; i < dir->nr; i++)
410 free_ref_entry(dir->entries[i]);
411 free(dir->entries);
412 dir->sorted = dir->nr = dir->alloc = 0;
413 dir->entries = NULL;
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]414}
415
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]416/*
417 * Create a struct ref_entry object for the specified dirname.
418 * dirname is the name of the directory with a trailing slash (e.g.,
419 * "refs/heads/") or "" for the top-level directory.
420 */
Michael Haggertyf006c422012-04-26 22:27:05[diff] [blame]421static struct ref_entry *create_dir_entry(struct ref_cache *ref_cache,
René Scharfeb9146f52012-05-22 18:50:52[diff] [blame]422 const char *dirname, size_t len,
423 int incomplete)
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]424{
425 struct ref_entry *direntry;
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]426 direntry = xcalloc(1, sizeof(struct ref_entry) + len + 1);
René Scharfeb9146f52012-05-22 18:50:52[diff] [blame]427 memcpy(direntry->name, dirname, len);
428 direntry->name[len] = '\0';
Michael Haggertyf006c422012-04-26 22:27:05[diff] [blame]429 direntry->u.subdir.ref_cache = ref_cache;
Michael Haggerty28e6a342012-04-26 22:27:07[diff] [blame]430 direntry->flag = REF_DIR | (incomplete ? REF_INCOMPLETE : 0);
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]431 return direntry;
432}
433
Julian Phillipse9c4c112011-09-29 22:11:42[diff] [blame]434static int ref_entry_cmp(const void *a, const void *b)
Julian Phillipsc774aab2007-04-17 01:42:50[diff] [blame]435{
Julian Phillipse9c4c112011-09-29 22:11:42[diff] [blame]436 struct ref_entry *one = *(struct ref_entry **)a;
437 struct ref_entry *two = *(struct ref_entry **)b;
438 return strcmp(one->name, two->name);
439}
Julian Phillipsc774aab2007-04-17 01:42:50[diff] [blame]440
Michael Haggertyd3177272012-04-10 05:30:24[diff] [blame]441static void sort_ref_dir(struct ref_dir *dir);
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]442
Junio C Hamanoe1980c92012-05-22 21:03:29[diff] [blame]443struct string_slice {
444 size_t len;
445 const char *str;
446};
447
448static int ref_entry_cmp_sslice(const void *key_, const void *ent_)
449{
René Scharfec971ddf2013-01-16 01:08:16[diff] [blame]450 const struct string_slice *key = key_;
451 const struct ref_entry *ent = *(const struct ref_entry * const *)ent_;
452 int cmp = strncmp(key->str, ent->name, key->len);
Junio C Hamanoe1980c92012-05-22 21:03:29[diff] [blame]453 if (cmp)
454 return cmp;
René Scharfec971ddf2013-01-16 01:08:16[diff] [blame]455 return '\0' - (unsigned char)ent->name[key->len];
Junio C Hamanoe1980c92012-05-22 21:03:29[diff] [blame]456}
457
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]458/*
Michael Haggerty9fc0a642013-04-22 19:52:26[diff] [blame]459 * Return the index of the entry with the given refname from the
460 * ref_dir (non-recursively), sorting dir if necessary. Return -1 if
461 * no such entry is found. dir must already be complete.
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]462 */
Michael Haggerty9fc0a642013-04-22 19:52:26[diff] [blame]463static int search_ref_dir(struct ref_dir *dir, const char *refname, size_t len)
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]464{
Junio C Hamanoe1980c92012-05-22 21:03:29[diff] [blame]465 struct ref_entry **r;
466 struct string_slice key;
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]467
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]468 if (refname == NULL || !dir->nr)
Michael Haggerty9fc0a642013-04-22 19:52:26[diff] [blame]469 return -1;
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]470
Michael Haggertyd3177272012-04-10 05:30:24[diff] [blame]471 sort_ref_dir(dir);
Junio C Hamanoe1980c92012-05-22 21:03:29[diff] [blame]472 key.len = len;
473 key.str = refname;
474 r = bsearch(&key, dir->entries, dir->nr, sizeof(*dir->entries),
475 ref_entry_cmp_sslice);
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]476
477 if (r == NULL)
Michael Haggerty9fc0a642013-04-22 19:52:26[diff] [blame]478 return -1;
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]479
Michael Haggerty9fc0a642013-04-22 19:52:26[diff] [blame]480 return r - dir->entries;
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]481}
482
Michael Haggerty202a56a2011-12-12 05:38:15[diff] [blame]483/*
Michael Haggertyf348ac92012-04-24 22:45:11[diff] [blame]484 * Search for a directory entry directly within dir (without
485 * recursing). Sort dir if necessary. subdirname must be a directory
486 * name (i.e., end in '/'). If mkdir is set, then create the
487 * directory if it is missing; otherwise, return NULL if the desired
Michael Haggerty28e6a342012-04-26 22:27:07[diff] [blame]488 * directory cannot be found. dir must already be complete.
Michael Haggertyf348ac92012-04-24 22:45:11[diff] [blame]489 */
Michael Haggerty3f3aa1b2012-04-26 22:27:04[diff] [blame]490static struct ref_dir *search_for_subdir(struct ref_dir *dir,
René Scharfedd02e722012-05-22 18:50:58[diff] [blame]491 const char *subdirname, size_t len,
492 int mkdir)
Michael Haggertyf348ac92012-04-24 22:45:11[diff] [blame]493{
Michael Haggerty9fc0a642013-04-22 19:52:26[diff] [blame]494 int entry_index = search_ref_dir(dir, subdirname, len);
495 struct ref_entry *entry;
496 if (entry_index == -1) {
Michael Haggertyf348ac92012-04-24 22:45:11[diff] [blame]497 if (!mkdir)
498 return NULL;
Michael Haggerty28e6a342012-04-26 22:27:07[diff] [blame]499 /*
500 * Since dir is complete, the absence of a subdir
501 * means that the subdir really doesn't exist;
502 * therefore, create an empty record for it but mark
503 * the record complete.
504 */
René Scharfeb9146f52012-05-22 18:50:52[diff] [blame]505 entry = create_dir_entry(dir->ref_cache, subdirname, len, 0);
Michael Haggertyf348ac92012-04-24 22:45:11[diff] [blame]506 add_entry_to_dir(dir, entry);
Michael Haggerty9fc0a642013-04-22 19:52:26[diff] [blame]507 } else {
508 entry = dir->entries[entry_index];
Michael Haggertyf348ac92012-04-24 22:45:11[diff] [blame]509 }
Michael Haggerty3f3aa1b2012-04-26 22:27:04[diff] [blame]510 return get_ref_dir(entry);
Michael Haggertyf348ac92012-04-24 22:45:11[diff] [blame]511}
512
513/*
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]514 * If refname is a reference name, find the ref_dir within the dir
515 * tree that should hold refname. If refname is a directory name
516 * (i.e., ends in '/'), then return that ref_dir itself. dir must
Michael Haggerty28e6a342012-04-26 22:27:07[diff] [blame]517 * represent the top-level directory and must already be complete.
518 * Sort ref_dirs and recurse into subdirectories as necessary. If
519 * mkdir is set, then create any missing directories; otherwise,
520 * return NULL if the desired directory cannot be found.
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]521 */
522static struct ref_dir *find_containing_dir(struct ref_dir *dir,
523 const char *refname, int mkdir)
524{
Michael Haggerty5fa04412012-04-26 22:27:00[diff] [blame]525 const char *slash;
Michael Haggerty5fa04412012-04-26 22:27:00[diff] [blame]526 for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) {
René Scharfedd02e722012-05-22 18:50:58[diff] [blame]527 size_t dirnamelen = slash - refname + 1;
Michael Haggerty3f3aa1b2012-04-26 22:27:04[diff] [blame]528 struct ref_dir *subdir;
René Scharfedd02e722012-05-22 18:50:58[diff] [blame]529 subdir = search_for_subdir(dir, refname, dirnamelen, mkdir);
Junio C Hamano663c1292012-05-03 22:12:54[diff] [blame]530 if (!subdir) {
531 dir = NULL;
Michael Haggertyf348ac92012-04-24 22:45:11[diff] [blame]532 break;
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]533 }
Michael Haggerty3f3aa1b2012-04-26 22:27:04[diff] [blame]534 dir = subdir;
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]535 }
536
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]537 return dir;
538}
539
540/*
541 * Find the value entry with the given name in dir, sorting ref_dirs
542 * and recursing into subdirectories as necessary. If the name is not
543 * found or it corresponds to a directory entry, return NULL.
544 */
545static struct ref_entry *find_ref(struct ref_dir *dir, const char *refname)
546{
Michael Haggerty9fc0a642013-04-22 19:52:26[diff] [blame]547 int entry_index;
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]548 struct ref_entry *entry;
549 dir = find_containing_dir(dir, refname, 0);
550 if (!dir)
551 return NULL;
Michael Haggerty9fc0a642013-04-22 19:52:26[diff] [blame]552 entry_index = search_ref_dir(dir, refname, strlen(refname));
553 if (entry_index == -1)
554 return NULL;
555 entry = dir->entries[entry_index];
556 return (entry->flag & REF_DIR) ? NULL : entry;
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]557}
558
559/*
Michael Haggerty506a7602013-04-22 19:52:27[diff] [blame]560 * Remove the entry with the given name from dir, recursing into
561 * subdirectories as necessary. If refname is the name of a directory
562 * (i.e., ends with '/'), then remove the directory and its contents.
563 * If the removal was successful, return the number of entries
564 * remaining in the directory entry that contained the deleted entry.
565 * If the name was not found, return -1. Please note that this
566 * function only deletes the entry from the cache; it does not delete
567 * it from the filesystem or ensure that other cache entries (which
568 * might be symbolic references to the removed entry) are updated.
569 * Nor does it remove any containing dir entries that might be made
570 * empty by the removal. dir must represent the top-level directory
571 * and must already be complete.
572 */
573static int remove_entry(struct ref_dir *dir, const char *refname)
574{
575 int refname_len = strlen(refname);
576 int entry_index;
577 struct ref_entry *entry;
578 int is_dir = refname[refname_len - 1] == '/';
579 if (is_dir) {
580 /*
581 * refname represents a reference directory. Remove
582 * the trailing slash; otherwise we will get the
583 * directory *representing* refname rather than the
584 * one *containing* it.
585 */
586 char *dirname = xmemdupz(refname, refname_len - 1);
587 dir = find_containing_dir(dir, dirname, 0);
588 free(dirname);
589 } else {
590 dir = find_containing_dir(dir, refname, 0);
591 }
592 if (!dir)
593 return -1;
594 entry_index = search_ref_dir(dir, refname, refname_len);
595 if (entry_index == -1)
596 return -1;
597 entry = dir->entries[entry_index];
598
599 memmove(&dir->entries[entry_index],
600 &dir->entries[entry_index + 1],
601 (dir->nr - entry_index - 1) * sizeof(*dir->entries)
602 );
603 dir->nr--;
604 if (dir->sorted > entry_index)
605 dir->sorted--;
606 free_ref_entry(entry);
607 return dir->nr;
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]608}
609
610/*
611 * Add a ref_entry to the ref_dir (unsorted), recursing into
612 * subdirectories as necessary. dir must represent the top-level
613 * directory. Return 0 on success.
614 */
615static int add_ref(struct ref_dir *dir, struct ref_entry *ref)
616{
617 dir = find_containing_dir(dir, ref->name, 1);
618 if (!dir)
619 return -1;
620 add_entry_to_dir(dir, ref);
621 return 0;
622}
623
624/*
Michael Haggerty202a56a2011-12-12 05:38:15[diff] [blame]625 * Emit a warning and return true iff ref1 and ref2 have the same name
626 * and the same sha1. Die if they have the same name but different
627 * sha1s.
628 */
629static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2)
630{
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]631 if (strcmp(ref1->name, ref2->name))
Michael Haggerty202a56a2011-12-12 05:38:15[diff] [blame]632 return 0;
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]633
634 /* Duplicate name; make sure that they don't conflict: */
635
636 if ((ref1->flag & REF_DIR) || (ref2->flag & REF_DIR))
637 /* This is impossible by construction */
638 die("Reference directory conflict: %s", ref1->name);
639
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]640 if (oidcmp(&ref1->u.value.oid, &ref2->u.value.oid))
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]641 die("Duplicated ref, and SHA1s don't match: %s", ref1->name);
642
643 warning("Duplicated ref: %s", ref1->name);
644 return 1;
Michael Haggerty202a56a2011-12-12 05:38:15[diff] [blame]645}
646
Michael Haggertye6ed3ca2012-01-17 05:50:32[diff] [blame]647/*
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]648 * Sort the entries in dir non-recursively (if they are not already
649 * sorted) and remove any duplicate entries.
Michael Haggertye6ed3ca2012-01-17 05:50:32[diff] [blame]650 */
Michael Haggertyd3177272012-04-10 05:30:24[diff] [blame]651static void sort_ref_dir(struct ref_dir *dir)
Julian Phillipse9c4c112011-09-29 22:11:42[diff] [blame]652{
Michael Haggerty202a56a2011-12-12 05:38:15[diff] [blame]653 int i, j;
Michael Haggerty81a79d82012-04-10 05:30:25[diff] [blame]654 struct ref_entry *last = NULL;
Julian Phillipsc774aab2007-04-17 01:42:50[diff] [blame]655
Michael Haggertye6ed3ca2012-01-17 05:50:32[diff] [blame]656 /*
657 * This check also prevents passing a zero-length array to qsort(),
658 * which is a problem on some platforms.
659 */
Michael Haggertyd3177272012-04-10 05:30:24[diff] [blame]660 if (dir->sorted == dir->nr)
Julian Phillipse9c4c112011-09-29 22:11:42[diff] [blame]661 return;
Julian Phillipsc774aab2007-04-17 01:42:50[diff] [blame]662
Michael Haggertyd3177272012-04-10 05:30:24[diff] [blame]663 qsort(dir->entries, dir->nr, sizeof(*dir->entries), ref_entry_cmp);
Julian Phillipsc774aab2007-04-17 01:42:50[diff] [blame]664
Michael Haggerty81a79d82012-04-10 05:30:25[diff] [blame]665 /* Remove any duplicates: */
666 for (i = 0, j = 0; j < dir->nr; j++) {
667 struct ref_entry *entry = dir->entries[j];
668 if (last && is_dup_ref(last, entry))
669 free_ref_entry(entry);
670 else
671 last = dir->entries[i++] = entry;
Julian Phillipse9c4c112011-09-29 22:11:42[diff] [blame]672 }
Michael Haggerty81a79d82012-04-10 05:30:25[diff] [blame]673 dir->sorted = dir->nr = i;
Julian Phillipse9c4c112011-09-29 22:11:42[diff] [blame]674}
Julian Phillipsc774aab2007-04-17 01:42:50[diff] [blame]675
Michael Haggertyfcce1702013-04-22 19:52:11[diff] [blame]676/* Include broken references in a do_for_each_ref*() iteration: */
677#define DO_FOR_EACH_INCLUDE_BROKEN 0x01
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]678
Michael Haggerty7d76fdc2013-04-22 19:52:12[diff] [blame]679/*
Michael Haggerty662428f2013-04-22 19:52:18[diff] [blame]680 * Return true iff the reference described by entry can be resolved to
681 * an object in the database. Emit a warning if the referred-to
682 * object does not exist.
683 */
684static int ref_resolves_to_object(struct ref_entry *entry)
685{
686 if (entry->flag & REF_ISBROKEN)
687 return 0;
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]688 if (!has_sha1_file(entry->u.value.oid.hash)) {
Michael Haggerty662428f2013-04-22 19:52:18[diff] [blame]689 error("%s does not point to a valid object!", entry->name);
690 return 0;
691 }
692 return 1;
693}
694
695/*
Michael Haggerty7d76fdc2013-04-22 19:52:12[diff] [blame]696 * current_ref is a performance hack: when iterating over references
697 * using the for_each_ref*() functions, current_ref is set to the
698 * current reference's entry before calling the callback function. If
699 * the callback function calls peel_ref(), then peel_ref() first
700 * checks whether the reference to be peeled is the current reference
701 * (it usually is) and if so, returns that reference's peeled version
702 * if it is available. This avoids a refname lookup in a common case.
703 */
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]704static struct ref_entry *current_ref;
705
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]706typedef int each_ref_entry_fn(struct ref_entry *entry, void *cb_data);
707
708struct ref_entry_cb {
709 const char *base;
710 int trim;
711 int flags;
712 each_ref_fn *fn;
713 void *cb_data;
714};
715
Michael Haggertyfcce1702013-04-22 19:52:11[diff] [blame]716/*
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]717 * Handle one reference in a do_for_each_ref*()-style iteration,
718 * calling an each_ref_fn for each entry.
Michael Haggertyfcce1702013-04-22 19:52:11[diff] [blame]719 */
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]720static int do_one_ref(struct ref_entry *entry, void *cb_data)
Julian Phillipse9c4c112011-09-29 22:11:42[diff] [blame]721{
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]722 struct ref_entry_cb *data = cb_data;
Michael Haggertyd0cf51e2013-07-15 15:24:17[diff] [blame]723 struct ref_entry *old_current_ref;
Michael Haggerty429213e2012-04-10 05:30:14[diff] [blame]724 int retval;
Michael Haggertyd0cf51e2013-07-15 15:24:17[diff] [blame]725
Christian Couder59556542013-11-30 20:55:40[diff] [blame]726 if (!starts_with(entry->name, data->base))
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]727 return 0;
Julian Phillipsc774aab2007-04-17 01:42:50[diff] [blame]728
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]729 if (!(data->flags & DO_FOR_EACH_INCLUDE_BROKEN) &&
Michael Haggerty662428f2013-04-22 19:52:18[diff] [blame]730 !ref_resolves_to_object(entry))
731 return 0;
732
Michael Haggertyd0cf51e2013-07-15 15:24:17[diff] [blame]733 /* Store the old value, in case this is a recursive call: */
734 old_current_ref = current_ref;
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]735 current_ref = entry;
Michael Haggerty2b2a5be2015-05-25 18:38:28[diff] [blame]736 retval = data->fn(entry->name + data->trim, &entry->u.value.oid,
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]737 entry->flag, data->cb_data);
Michael Haggertyd0cf51e2013-07-15 15:24:17[diff] [blame]738 current_ref = old_current_ref;
Michael Haggerty429213e2012-04-10 05:30:14[diff] [blame]739 return retval;
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]740}
Julian Phillipsc774aab2007-04-17 01:42:50[diff] [blame]741
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]742/*
Michael Haggertyd3177272012-04-10 05:30:24[diff] [blame]743 * Call fn for each reference in dir that has index in the range
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]744 * offset <= index < dir->nr. Recurse into subdirectories that are in
745 * that index range, sorting them before iterating. This function
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]746 * does not sort dir itself; it should be sorted beforehand. fn is
747 * called for all references, including broken ones.
Michael Haggertyc36b5bc2012-04-10 05:30:15[diff] [blame]748 */
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]749static int do_for_each_entry_in_dir(struct ref_dir *dir, int offset,
750 each_ref_entry_fn fn, void *cb_data)
Michael Haggertyc36b5bc2012-04-10 05:30:15[diff] [blame]751{
752 int i;
Michael Haggertyd3177272012-04-10 05:30:24[diff] [blame]753 assert(dir->sorted == dir->nr);
754 for (i = offset; i < dir->nr; i++) {
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]755 struct ref_entry *entry = dir->entries[i];
756 int retval;
757 if (entry->flag & REF_DIR) {
Michael Haggertyd7826d52012-04-26 22:27:03[diff] [blame]758 struct ref_dir *subdir = get_ref_dir(entry);
759 sort_ref_dir(subdir);
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]760 retval = do_for_each_entry_in_dir(subdir, 0, fn, cb_data);
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]761 } else {
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]762 retval = fn(entry, cb_data);
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]763 }
Michael Haggertyc36b5bc2012-04-10 05:30:15[diff] [blame]764 if (retval)
765 return retval;
766 }
767 return 0;
768}
769
770/*
Michael Haggertyd3177272012-04-10 05:30:24[diff] [blame]771 * Call fn for each reference in the union of dir1 and dir2, in order
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]772 * by refname. Recurse into subdirectories. If a value entry appears
773 * in both dir1 and dir2, then only process the version that is in
774 * dir2. The input dirs must already be sorted, but subdirs will be
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]775 * sorted as needed. fn is called for all references, including
776 * broken ones.
Michael Haggertyb3fd0602012-04-10 05:30:16[diff] [blame]777 */
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]778static int do_for_each_entry_in_dirs(struct ref_dir *dir1,
779 struct ref_dir *dir2,
780 each_ref_entry_fn fn, void *cb_data)
Michael Haggertyb3fd0602012-04-10 05:30:16[diff] [blame]781{
782 int retval;
783 int i1 = 0, i2 = 0;
784
Michael Haggertyd3177272012-04-10 05:30:24[diff] [blame]785 assert(dir1->sorted == dir1->nr);
786 assert(dir2->sorted == dir2->nr);
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]787 while (1) {
788 struct ref_entry *e1, *e2;
789 int cmp;
790 if (i1 == dir1->nr) {
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]791 return do_for_each_entry_in_dir(dir2, i2, fn, cb_data);
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]792 }
793 if (i2 == dir2->nr) {
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]794 return do_for_each_entry_in_dir(dir1, i1, fn, cb_data);
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]795 }
796 e1 = dir1->entries[i1];
797 e2 = dir2->entries[i2];
798 cmp = strcmp(e1->name, e2->name);
799 if (cmp == 0) {
800 if ((e1->flag & REF_DIR) && (e2->flag & REF_DIR)) {
801 /* Both are directories; descend them in parallel. */
Michael Haggertyd7826d52012-04-26 22:27:03[diff] [blame]802 struct ref_dir *subdir1 = get_ref_dir(e1);
803 struct ref_dir *subdir2 = get_ref_dir(e2);
804 sort_ref_dir(subdir1);
805 sort_ref_dir(subdir2);
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]806 retval = do_for_each_entry_in_dirs(
807 subdir1, subdir2, fn, cb_data);
Michael Haggertyb3fd0602012-04-10 05:30:16[diff] [blame]808 i1++;
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]809 i2++;
810 } else if (!(e1->flag & REF_DIR) && !(e2->flag & REF_DIR)) {
811 /* Both are references; ignore the one from dir1. */
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]812 retval = fn(e2, cb_data);
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]813 i1++;
814 i2++;
815 } else {
816 die("conflict between reference and directory: %s",
817 e1->name);
818 }
819 } else {
820 struct ref_entry *e;
821 if (cmp < 0) {
822 e = e1;
823 i1++;
824 } else {
825 e = e2;
826 i2++;
827 }
828 if (e->flag & REF_DIR) {
Michael Haggertyd7826d52012-04-26 22:27:03[diff] [blame]829 struct ref_dir *subdir = get_ref_dir(e);
830 sort_ref_dir(subdir);
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]831 retval = do_for_each_entry_in_dir(
832 subdir, 0, fn, cb_data);
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]833 } else {
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]834 retval = fn(e, cb_data);
Michael Haggertyb3fd0602012-04-10 05:30:16[diff] [blame]835 }
836 }
837 if (retval)
838 return retval;
839 }
Michael Haggertyb3fd0602012-04-10 05:30:16[diff] [blame]840}
841
842/*
Jeff King98eeb092013-06-20 08:37:53[diff] [blame]843 * Load all of the refs from the dir into our in-memory cache. The hard work
844 * of loading loose refs is done by get_ref_dir(), so we just need to recurse
845 * through all of the sub-directories. We do not even need to care about
846 * sorting, as traversal order does not matter to us.
847 */
848static void prime_ref_dir(struct ref_dir *dir)
849{
850 int i;
851 for (i = 0; i < dir->nr; i++) {
852 struct ref_entry *entry = dir->entries[i];
853 if (entry->flag & REF_DIR)
854 prime_ref_dir(get_ref_dir(entry));
855 }
856}
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]857
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]858struct nonmatching_ref_data {
Ronnie Sahlberg5fe7d822014-05-01 18:16:07[diff] [blame]859 const struct string_list *skip;
Michael Haggerty521331c2015-05-11 15:25:09[diff] [blame]860 const char *conflicting_refname;
Michael Haggerty5a4d4942012-04-10 05:30:19[diff] [blame]861};
862
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]863static int nonmatching_ref_fn(struct ref_entry *entry, void *vdata)
Michael Haggerty5a4d4942012-04-10 05:30:19[diff] [blame]864{
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]865 struct nonmatching_ref_data *data = vdata;
866
Michael Haggerty8bfac192015-05-11 15:25:07[diff] [blame]867 if (data->skip && string_list_has_string(data->skip, entry->name))
Michael Haggerty5a4d4942012-04-10 05:30:19[diff] [blame]868 return 0;
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]869
Michael Haggerty521331c2015-05-11 15:25:09[diff] [blame]870 data->conflicting_refname = entry->name;
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]871 return 1;
872}
873
Michael Haggertyd66da472012-04-10 05:30:17[diff] [blame]874/*
Michael Haggerty5baf37d2015-05-11 15:25:13[diff] [blame]875 * Return 0 if a reference named refname could be created without
876 * conflicting with the name of an existing reference in dir.
Michael Haggerty1146f172015-05-11 15:25:14[diff] [blame]877 * Otherwise, return a negative value and write an explanation to err.
878 * If extras is non-NULL, it is a list of additional refnames with
879 * which refname is not allowed to conflict. If skip is non-NULL,
880 * ignore potential conflicts with refs in skip (e.g., because they
881 * are scheduled for deletion in the same operation). Behavior is
882 * undefined if the same name is listed in both extras and skip.
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]883 *
884 * Two reference names conflict if one of them exactly matches the
Michael Haggerty49e81872015-05-11 15:25:04[diff] [blame]885 * leading components of the other; e.g., "refs/foo/bar" conflicts
886 * with both "refs/foo" and with "refs/foo/bar/baz" but not with
887 * "refs/foo/bar" or "refs/foo/barbados".
Ronnie Sahlberg5fe7d822014-05-01 18:16:07[diff] [blame]888 *
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]889 * extras and skip must be sorted.
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]890 */
Michael Haggerty5baf37d2015-05-11 15:25:13[diff] [blame]891static int verify_refname_available(const char *refname,
892 const struct string_list *extras,
893 const struct string_list *skip,
Michael Haggerty1146f172015-05-11 15:25:14[diff] [blame]894 struct ref_dir *dir,
895 struct strbuf *err)
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]896{
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]897 const char *slash;
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]898 int pos;
Michael Haggerty6075f302015-05-11 15:25:06[diff] [blame]899 struct strbuf dirname = STRBUF_INIT;
Michael Haggerty5baf37d2015-05-11 15:25:13[diff] [blame]900 int ret = -1;
Michael Haggerty5a4d4942012-04-10 05:30:19[diff] [blame]901
Michael Haggerty49e81872015-05-11 15:25:04[diff] [blame]902 /*
903 * For the sake of comments in this function, suppose that
904 * refname is "refs/foo/bar".
905 */
906
Michael Haggerty1146f172015-05-11 15:25:14[diff] [blame]907 assert(err);
908
Michael Haggerty61da5962015-05-11 15:25:10[diff] [blame]909 strbuf_grow(&dirname, strlen(refname) + 1);
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]910 for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) {
Michael Haggerty61da5962015-05-11 15:25:10[diff] [blame]911 /* Expand dirname to the new prefix, not including the trailing slash: */
912 strbuf_add(&dirname, refname + dirname.len, slash - refname - dirname.len);
913
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]914 /*
Michael Haggerty49e81872015-05-11 15:25:04[diff] [blame]915 * We are still at a leading dir of the refname (e.g.,
916 * "refs/foo"; if there is a reference with that name,
917 * it is a conflict, *unless* it is in skip.
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]918 */
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]919 if (dir) {
920 pos = search_ref_dir(dir, dirname.buf, dirname.len);
921 if (pos >= 0 &&
922 (!skip || !string_list_has_string(skip, dirname.buf))) {
Michael Haggerty49e81872015-05-11 15:25:04[diff] [blame]923 /*
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]924 * We found a reference whose name is
925 * a proper prefix of refname; e.g.,
926 * "refs/foo", and is not in skip.
Michael Haggerty49e81872015-05-11 15:25:04[diff] [blame]927 */
Michael Haggerty1146f172015-05-11 15:25:14[diff] [blame]928 strbuf_addf(err, "'%s' exists; cannot create '%s'",
929 dirname.buf, refname);
Michael Haggerty61da5962015-05-11 15:25:10[diff] [blame]930 goto cleanup;
Michael Haggerty49e81872015-05-11 15:25:04[diff] [blame]931 }
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]932 }
933
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]934 if (extras && string_list_has_string(extras, dirname.buf) &&
935 (!skip || !string_list_has_string(skip, dirname.buf))) {
Michael Haggerty1146f172015-05-11 15:25:14[diff] [blame]936 strbuf_addf(err, "cannot process '%s' and '%s' at the same time",
937 refname, dirname.buf);
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]938 goto cleanup;
939 }
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]940
941 /*
942 * Otherwise, we can try to continue our search with
Michael Haggerty49e81872015-05-11 15:25:04[diff] [blame]943 * the next component. So try to look up the
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]944 * directory, e.g., "refs/foo/". If we come up empty,
945 * we know there is nothing under this whole prefix,
946 * but even in that case we still have to continue the
947 * search for conflicts with extras.
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]948 */
Michael Haggerty61da5962015-05-11 15:25:10[diff] [blame]949 strbuf_addch(&dirname, '/');
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]950 if (dir) {
951 pos = search_ref_dir(dir, dirname.buf, dirname.len);
952 if (pos < 0) {
953 /*
954 * There was no directory "refs/foo/",
955 * so there is nothing under this
956 * whole prefix. So there is no need
957 * to continue looking for conflicting
958 * references. But we need to continue
959 * looking for conflicting extras.
960 */
961 dir = NULL;
962 } else {
963 dir = get_ref_dir(dir->entries[pos]);
964 }
Michael Haggerty49e81872015-05-11 15:25:04[diff] [blame]965 }
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]966 }
967
968 /*
Michael Haggerty49e81872015-05-11 15:25:04[diff] [blame]969 * We are at the leaf of our refname (e.g., "refs/foo/bar").
970 * There is no point in searching for a reference with that
971 * name, because a refname isn't considered to conflict with
972 * itself. But we still need to check for references whose
973 * names are in the "refs/foo/bar/" namespace, because they
974 * *do* conflict.
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]975 */
Michael Haggerty61da5962015-05-11 15:25:10[diff] [blame]976 strbuf_addstr(&dirname, refname + dirname.len);
Michael Haggerty6075f302015-05-11 15:25:06[diff] [blame]977 strbuf_addch(&dirname, '/');
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]978
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]979 if (dir) {
980 pos = search_ref_dir(dir, dirname.buf, dirname.len);
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]981
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]982 if (pos >= 0) {
983 /*
984 * We found a directory named "$refname/"
985 * (e.g., "refs/foo/bar/"). It is a problem
986 * iff it contains any ref that is not in
987 * "skip".
988 */
989 struct nonmatching_ref_data data;
990
991 data.skip = skip;
992 data.conflicting_refname = NULL;
993 dir = get_ref_dir(dir->entries[pos]);
994 sort_ref_dir(dir);
995 if (do_for_each_entry_in_dir(dir, 0, nonmatching_ref_fn, &data)) {
Michael Haggerty1146f172015-05-11 15:25:14[diff] [blame]996 strbuf_addf(err, "'%s' exists; cannot create '%s'",
997 data.conflicting_refname, refname);
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]998 goto cleanup;
999 }
Michael Haggerty61da5962015-05-11 15:25:10[diff] [blame]1000 }
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1001 }
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]1002
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]1003 if (extras) {
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]1004 /*
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]1005 * Check for entries in extras that start with
1006 * "$refname/". We do that by looking for the place
1007 * where "$refname/" would be inserted in extras. If
1008 * there is an entry at that position that starts with
1009 * "$refname/" and is not in skip, then we have a
1010 * conflict.
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]1011 */
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]1012 for (pos = string_list_find_insert_index(extras, dirname.buf, 0);
1013 pos < extras->nr; pos++) {
1014 const char *extra_refname = extras->items[pos].string;
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]1015
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]1016 if (!starts_with(extra_refname, dirname.buf))
1017 break;
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]1018
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]1019 if (!skip || !string_list_has_string(skip, extra_refname)) {
Michael Haggerty1146f172015-05-11 15:25:14[diff] [blame]1020 strbuf_addf(err, "cannot process '%s' and '%s' at the same time",
1021 refname, extra_refname);
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]1022 goto cleanup;
1023 }
1024 }
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1025 }
Jeff Kingcbe73332014-09-10 11:11:55[diff] [blame]1026
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]1027 /* No conflicts were found */
Michael Haggerty5baf37d2015-05-11 15:25:13[diff] [blame]1028 ret = 0;
Michael Haggerty61da5962015-05-11 15:25:10[diff] [blame]1029
1030cleanup:
1031 strbuf_release(&dirname);
1032 return ret;
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]1033}
1034
Michael Haggerty2fff7812013-06-20 08:37:45[diff] [blame]1035struct packed_ref_cache {
1036 struct ref_entry *root;
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]1037
1038 /*
Michael Haggerty5f5e2a82013-06-20 08:37:47[diff] [blame]1039 * Count of references to the data structure in this instance,
1040 * including the pointer from ref_cache::packed if any. The
1041 * data will not be freed as long as the reference count is
1042 * nonzero.
1043 */
1044 unsigned int referrers;
1045
1046 /*
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]1047 * Iff the packed-refs file associated with this instance is
1048 * currently locked for writing, this points at the associated
Michael Haggerty4f6b83e2013-06-20 08:37:49[diff] [blame]1049 * lock (which is owned by somebody else). The referrer count
1050 * is also incremented when the file is locked and decremented
1051 * when it is unlocked.
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]1052 */
1053 struct lock_file *lock;
Jeff Kingca919932013-06-20 08:37:52[diff] [blame]1054
1055 /* The metadata from when this packed-refs cache was read */
1056 struct stat_validity validity;
Michael Haggerty2fff7812013-06-20 08:37:45[diff] [blame]1057};
1058
Junio C Hamano5e290ff2006-09-30 19:37:37[diff] [blame]1059/*
1060 * Future: need to be in "struct repository"
1061 * when doing a full libification.
1062 */
Michael Haggerty79c7ca52011-10-17 02:38:05[diff] [blame]1063static struct ref_cache {
1064 struct ref_cache *next;
Michael Haggertyd12229f2012-04-26 22:27:01[diff] [blame]1065 struct ref_entry *loose;
Michael Haggerty2fff7812013-06-20 08:37:45[diff] [blame]1066 struct packed_ref_cache *packed;
Michael Haggerty9da31cb2013-04-22 19:52:41[diff] [blame]1067 /*
1068 * The submodule name, or "" for the main repo. We allocate
1069 * length 1 rather than FLEX_ARRAY so that the main ref_cache
1070 * is initialized correctly.
1071 */
1072 char name[1];
1073} ref_cache, *submodule_ref_caches;
Michael Haggerty0e88c132011-08-12 22:36:29[diff] [blame]1074
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]1075/* Lock used for the main packed-refs file: */
1076static struct lock_file packlock;
1077
Michael Haggerty5f5e2a82013-06-20 08:37:47[diff] [blame]1078/*
1079 * Increment the reference count of *packed_refs.
1080 */
1081static void acquire_packed_ref_cache(struct packed_ref_cache *packed_refs)
1082{
1083 packed_refs->referrers++;
1084}
1085
1086/*
1087 * Decrease the reference count of *packed_refs. If it goes to zero,
1088 * free *packed_refs and return true; otherwise return false.
1089 */
1090static int release_packed_ref_cache(struct packed_ref_cache *packed_refs)
1091{
1092 if (!--packed_refs->referrers) {
1093 free_ref_entry(packed_refs->root);
Jeff Kingca919932013-06-20 08:37:52[diff] [blame]1094 stat_validity_clear(&packed_refs->validity);
Michael Haggerty5f5e2a82013-06-20 08:37:47[diff] [blame]1095 free(packed_refs);
1096 return 1;
1097 } else {
1098 return 0;
1099 }
1100}
1101
Michael Haggerty760c4512011-10-17 02:38:09[diff] [blame]1102static void clear_packed_ref_cache(struct ref_cache *refs)
Junio C Hamano5e290ff2006-09-30 19:37:37[diff] [blame]1103{
Michael Haggertyd12229f2012-04-26 22:27:01[diff] [blame]1104 if (refs->packed) {
Michael Haggerty5f5e2a82013-06-20 08:37:47[diff] [blame]1105 struct packed_ref_cache *packed_refs = refs->packed;
1106
1107 if (packed_refs->lock)
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]1108 die("internal error: packed-ref cache cleared while locked");
Michael Haggertyd12229f2012-04-26 22:27:01[diff] [blame]1109 refs->packed = NULL;
Michael Haggerty5f5e2a82013-06-20 08:37:47[diff] [blame]1110 release_packed_ref_cache(packed_refs);
Michael Haggertyd12229f2012-04-26 22:27:01[diff] [blame]1111 }
Junio C Hamano5e290ff2006-09-30 19:37:37[diff] [blame]1112}
1113
Michael Haggerty760c4512011-10-17 02:38:09[diff] [blame]1114static void clear_loose_ref_cache(struct ref_cache *refs)
Junio C Hamano5e290ff2006-09-30 19:37:37[diff] [blame]1115{
Michael Haggertyd12229f2012-04-26 22:27:01[diff] [blame]1116 if (refs->loose) {
1117 free_ref_entry(refs->loose);
1118 refs->loose = NULL;
1119 }
Michael Haggerty760c4512011-10-17 02:38:09[diff] [blame]1120}
1121
Michael Haggerty79c7ca52011-10-17 02:38:05[diff] [blame]1122static struct ref_cache *create_ref_cache(const char *submodule)
Michael Haggertye5dbf602011-08-12 22:36:27[diff] [blame]1123{
Michael Haggertyce409792011-08-12 22:36:28[diff] [blame]1124 int len;
Michael Haggerty79c7ca52011-10-17 02:38:05[diff] [blame]1125 struct ref_cache *refs;
Michael Haggertyce409792011-08-12 22:36:28[diff] [blame]1126 if (!submodule)
1127 submodule = "";
1128 len = strlen(submodule) + 1;
Michael Haggerty79c7ca52011-10-17 02:38:05[diff] [blame]1129 refs = xcalloc(1, sizeof(struct ref_cache) + len);
Michael Haggertyce409792011-08-12 22:36:28[diff] [blame]1130 memcpy(refs->name, submodule, len);
Michael Haggertye5dbf602011-08-12 22:36:27[diff] [blame]1131 return refs;
1132}
1133
Michael Haggerty4349a662011-08-12 22:36:25[diff] [blame]1134/*
Michael Haggerty79c7ca52011-10-17 02:38:05[diff] [blame]1135 * Return a pointer to a ref_cache for the specified submodule. For
Michael Haggerty4349a662011-08-12 22:36:25[diff] [blame]1136 * the main repository, use submodule==NULL. The returned structure
1137 * will be allocated and initialized but not necessarily populated; it
1138 * should not be freed.
1139 */
Michael Haggerty79c7ca52011-10-17 02:38:05[diff] [blame]1140static struct ref_cache *get_ref_cache(const char *submodule)
Michael Haggerty4349a662011-08-12 22:36:25[diff] [blame]1141{
Michael Haggerty9da31cb2013-04-22 19:52:41[diff] [blame]1142 struct ref_cache *refs;
1143
1144 if (!submodule || !*submodule)
1145 return &ref_cache;
1146
1147 for (refs = submodule_ref_caches; refs; refs = refs->next)
Michael Haggerty0e88c132011-08-12 22:36:29[diff] [blame]1148 if (!strcmp(submodule, refs->name))
1149 return refs;
Michael Haggerty0e88c132011-08-12 22:36:29[diff] [blame]1150
Michael Haggerty79c7ca52011-10-17 02:38:05[diff] [blame]1151 refs = create_ref_cache(submodule);
Michael Haggerty9da31cb2013-04-22 19:52:41[diff] [blame]1152 refs->next = submodule_ref_caches;
1153 submodule_ref_caches = refs;
Michael Haggerty0e88c132011-08-12 22:36:29[diff] [blame]1154 return refs;
Michael Haggerty4349a662011-08-12 22:36:25[diff] [blame]1155}
1156
Michael Haggerty3feb4f02013-04-22 19:52:13[diff] [blame]1157/* The length of a peeled reference line in packed-refs, including EOL: */
1158#define PEELED_LINE_LENGTH 42
1159
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1160/*
Michael Haggerty694b7a12013-04-22 19:52:29[diff] [blame]1161 * The packed-refs header line that we write out. Perhaps other
1162 * traits will be added later. The trailing space is required.
1163 */
1164static const char PACKED_REFS_HEADER[] =
1165 "# pack-refs with: peeled fully-peeled \n";
1166
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1167/*
1168 * Parse one line from a packed-refs file. Write the SHA1 to sha1.
1169 * Return a pointer to the refname within the line (null-terminated),
1170 * or NULL if there was a problem.
1171 */
Jeff King6a498702014-12-10 10:40:19[diff] [blame]1172static const char *parse_ref_line(struct strbuf *line, unsigned char *sha1)
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1173{
Jeff King6a498702014-12-10 10:40:19[diff] [blame]1174 const char *ref;
1175
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1176 /*
1177 * 42: the answer to everything.
1178 *
1179 * In this case, it happens to be the answer to
1180 * 40 (length of sha1 hex representation)
1181 * +1 (space in between hex and name)
1182 * +1 (newline at the end of the line)
1183 */
Jeff King6a498702014-12-10 10:40:19[diff] [blame]1184 if (line->len <= 42)
1185 return NULL;
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1186
Jeff King6a498702014-12-10 10:40:19[diff] [blame]1187 if (get_sha1_hex(line->buf, sha1) < 0)
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1188 return NULL;
Jeff King6a498702014-12-10 10:40:19[diff] [blame]1189 if (!isspace(line->buf[40]))
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1190 return NULL;
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1191
Jeff King6a498702014-12-10 10:40:19[diff] [blame]1192 ref = line->buf + 41;
1193 if (isspace(*ref))
1194 return NULL;
1195
1196 if (line->buf[line->len - 1] != '\n')
1197 return NULL;
1198 line->buf[--line->len] = 0;
1199
1200 return ref;
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1201}
1202
Michael Haggertyc29c46f2013-03-18 11:37:32[diff] [blame]1203/*
1204 * Read f, which is a packed-refs file, into dir.
1205 *
1206 * A comment line of the form "# pack-refs with: " may contain zero or
1207 * more traits. We interpret the traits as follows:
1208 *
1209 * No traits:
1210 *
1211 * Probably no references are peeled. But if the file contains a
1212 * peeled value for a reference, we will use it.
1213 *
1214 * peeled:
1215 *
1216 * References under "refs/tags/", if they *can* be peeled, *are*
1217 * peeled in this file. References outside of "refs/tags/" are
1218 * probably not peeled even if they could have been, but if we find
1219 * a peeled value for such a reference we will use it.
1220 *
1221 * fully-peeled:
1222 *
1223 * All references in the file that can be peeled are peeled.
1224 * Inversely (and this is more important), any references in the
1225 * file for which no peeled value is recorded is not peelable. This
1226 * trait should typically be written alongside "peeled" for
1227 * compatibility with older clients, but we do not require it
1228 * (i.e., "peeled" is a no-op if "fully-peeled" is set).
1229 */
Michael Haggertyd3177272012-04-10 05:30:24[diff] [blame]1230static void read_packed_refs(FILE *f, struct ref_dir *dir)
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]1231{
Julian Phillipse9c4c112011-09-29 22:11:42[diff] [blame]1232 struct ref_entry *last = NULL;
Jeff King10c497a2014-12-10 10:40:07[diff] [blame]1233 struct strbuf line = STRBUF_INIT;
Michael Haggertyc29c46f2013-03-18 11:37:32[diff] [blame]1234 enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE;
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]1235
Jeff King10c497a2014-12-10 10:40:07[diff] [blame]1236 while (strbuf_getwholeline(&line, f, '\n') != EOF) {
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]1237 unsigned char sha1[20];
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]1238 const char *refname;
Jeff Kingea417832014-12-10 10:40:36[diff] [blame]1239 const char *traits;
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]1240
Jeff Kingea417832014-12-10 10:40:36[diff] [blame]1241 if (skip_prefix(line.buf, "# pack-refs with:", &traits)) {
Michael Haggertyc29c46f2013-03-18 11:37:32[diff] [blame]1242 if (strstr(traits, " fully-peeled "))
1243 peeled = PEELED_FULLY;
1244 else if (strstr(traits, " peeled "))
1245 peeled = PEELED_TAGS;
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]1246 /* perhaps other traits later as well */
1247 continue;
1248 }
1249
Jeff King6a498702014-12-10 10:40:19[diff] [blame]1250 refname = parse_ref_line(&line, sha1);
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]1251 if (refname) {
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]1252 int flag = REF_ISPACKED;
1253
1254 if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
Jeff King03afcbe2015-04-16 09:03:26[diff] [blame]1255 if (!refname_is_safe(refname))
1256 die("packed refname is dangerous: %s", refname);
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]1257 hashclr(sha1);
1258 flag |= REF_BAD_NAME | REF_ISBROKEN;
1259 }
1260 last = create_ref_entry(refname, sha1, flag, 0);
Michael Haggertyc29c46f2013-03-18 11:37:32[diff] [blame]1261 if (peeled == PEELED_FULLY ||
Christian Couder59556542013-11-30 20:55:40[diff] [blame]1262 (peeled == PEELED_TAGS && starts_with(refname, "refs/tags/")))
Michael Haggertyc29c46f2013-03-18 11:37:32[diff] [blame]1263 last->flag |= REF_KNOWS_PEELED;
Michael Haggertyd3177272012-04-10 05:30:24[diff] [blame]1264 add_ref(dir, last);
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]1265 continue;
1266 }
1267 if (last &&
Jeff King10c497a2014-12-10 10:40:07[diff] [blame]1268 line.buf[0] == '^' &&
1269 line.len == PEELED_LINE_LENGTH &&
1270 line.buf[PEELED_LINE_LENGTH - 1] == '\n' &&
1271 !get_sha1_hex(line.buf + 1, sha1)) {
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]1272 hashcpy(last->u.value.peeled.hash, sha1);
Michael Haggertyc29c46f2013-03-18 11:37:32[diff] [blame]1273 /*
1274 * Regardless of what the file header said,
1275 * we definitely know the value of *this*
1276 * reference:
1277 */
1278 last->flag |= REF_KNOWS_PEELED;
1279 }
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]1280 }
Jeff King10c497a2014-12-10 10:40:07[diff] [blame]1281
1282 strbuf_release(&line);
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]1283}
1284
Michael Haggerty2fff7812013-06-20 08:37:45[diff] [blame]1285/*
1286 * Get the packed_ref_cache for the specified ref_cache, creating it
1287 * if necessary.
1288 */
1289static struct packed_ref_cache *get_packed_ref_cache(struct ref_cache *refs)
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]1290{
Jeff Kingfcd12db2015-08-10 09:35:31[diff] [blame]1291 char *packed_refs_file;
Jeff Kingca919932013-06-20 08:37:52[diff] [blame]1292
1293 if (*refs->name)
Jeff Kingfcd12db2015-08-10 09:35:31[diff] [blame]1294 packed_refs_file = git_pathdup_submodule(refs->name, "packed-refs");
Jeff Kingca919932013-06-20 08:37:52[diff] [blame]1295 else
Jeff Kingfcd12db2015-08-10 09:35:31[diff] [blame]1296 packed_refs_file = git_pathdup("packed-refs");
Jeff Kingca919932013-06-20 08:37:52[diff] [blame]1297
1298 if (refs->packed &&
1299 !stat_validity_check(&refs->packed->validity, packed_refs_file))
1300 clear_packed_ref_cache(refs);
1301
Michael Haggertyd12229f2012-04-26 22:27:01[diff] [blame]1302 if (!refs->packed) {
Michael Haggerty4349a662011-08-12 22:36:25[diff] [blame]1303 FILE *f;
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]1304
Michael Haggerty2fff7812013-06-20 08:37:45[diff] [blame]1305 refs->packed = xcalloc(1, sizeof(*refs->packed));
Michael Haggerty5f5e2a82013-06-20 08:37:47[diff] [blame]1306 acquire_packed_ref_cache(refs->packed);
Michael Haggerty2fff7812013-06-20 08:37:45[diff] [blame]1307 refs->packed->root = create_dir_entry(refs, "", 0, 0);
Michael Haggerty4349a662011-08-12 22:36:25[diff] [blame]1308 f = fopen(packed_refs_file, "r");
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]1309 if (f) {
Jeff Kingca919932013-06-20 08:37:52[diff] [blame]1310 stat_validity_update(&refs->packed->validity, fileno(f));
Michael Haggerty2fff7812013-06-20 08:37:45[diff] [blame]1311 read_packed_refs(f, get_ref_dir(refs->packed->root));
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]1312 fclose(f);
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]1313 }
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]1314 }
Jeff Kingfcd12db2015-08-10 09:35:31[diff] [blame]1315 free(packed_refs_file);
Michael Haggerty2fff7812013-06-20 08:37:45[diff] [blame]1316 return refs->packed;
1317}
1318
1319static struct ref_dir *get_packed_ref_dir(struct packed_ref_cache *packed_ref_cache)
1320{
1321 return get_ref_dir(packed_ref_cache->root);
1322}
1323
1324static struct ref_dir *get_packed_refs(struct ref_cache *refs)
1325{
1326 return get_packed_ref_dir(get_packed_ref_cache(refs));
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]1327}
1328
Michael Haggerty0a4b24f2015-06-22 14:03:02[diff] [blame]1329/*
1330 * Add a reference to the in-memory packed reference cache. This may
1331 * only be called while the packed-refs file is locked (see
1332 * lock_packed_refs()). To actually write the packed-refs file, call
1333 * commit_packed_refs().
1334 */
1335static void add_packed_ref(const char *refname, const unsigned char *sha1)
Michael Haggerty30249ee2012-01-17 05:50:33[diff] [blame]1336{
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]1337 struct packed_ref_cache *packed_ref_cache =
1338 get_packed_ref_cache(&ref_cache);
1339
1340 if (!packed_ref_cache->lock)
1341 die("internal error: packed refs not locked");
1342 add_ref(get_packed_ref_dir(packed_ref_cache),
Michael Haggerty9da31cb2013-04-22 19:52:41[diff] [blame]1343 create_ref_entry(refname, sha1, REF_ISPACKED, 1));
Michael Haggerty30249ee2012-01-17 05:50:33[diff] [blame]1344}
1345
Michael Haggertyabc39092012-04-24 22:45:10[diff] [blame]1346/*
Michael Haggerty28e6a342012-04-26 22:27:07[diff] [blame]1347 * Read the loose references from the namespace dirname into dir
1348 * (without recursing). dirname must end with '/'. dir must be the
1349 * directory entry corresponding to dirname.
Michael Haggertyabc39092012-04-24 22:45:10[diff] [blame]1350 */
Michael Haggerty423a1af2012-04-26 22:27:06[diff] [blame]1351static void read_loose_refs(const char *dirname, struct ref_dir *dir)
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]1352{
Michael Haggerty423a1af2012-04-26 22:27:06[diff] [blame]1353 struct ref_cache *refs = dir->ref_cache;
Michael Haggertyd3177272012-04-10 05:30:24[diff] [blame]1354 DIR *d;
Michael Haggertyd5fdae62012-04-24 22:45:07[diff] [blame]1355 struct dirent *de;
Michael Haggertyabc39092012-04-24 22:45:10[diff] [blame]1356 int dirnamelen = strlen(dirname);
Michael Haggerty72b64b42012-04-24 22:45:08[diff] [blame]1357 struct strbuf refname;
Jeff Kingf5b2dec2015-08-10 09:36:19[diff] [blame]1358 struct strbuf path = STRBUF_INIT;
1359 size_t path_baselen;
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]1360
Michael Haggerty3b124822011-12-12 05:38:17[diff] [blame]1361 if (*refs->name)
Jeff Kingf5b2dec2015-08-10 09:36:19[diff] [blame]1362 strbuf_git_path_submodule(&path, refs->name, "%s", dirname);
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]1363 else
Jeff Kingf5b2dec2015-08-10 09:36:19[diff] [blame]1364 strbuf_git_path(&path, "%s", dirname);
1365 path_baselen = path.len;
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]1366
Jeff Kingf5b2dec2015-08-10 09:36:19[diff] [blame]1367 d = opendir(path.buf);
1368 if (!d) {
1369 strbuf_release(&path);
Michael Haggertyd5fdae62012-04-24 22:45:07[diff] [blame]1370 return;
Jeff Kingf5b2dec2015-08-10 09:36:19[diff] [blame]1371 }
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]1372
Michael Haggerty66a3d202012-04-24 22:45:09[diff] [blame]1373 strbuf_init(&refname, dirnamelen + 257);
1374 strbuf_add(&refname, dirname, dirnamelen);
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]1375
Michael Haggertyd5fdae62012-04-24 22:45:07[diff] [blame]1376 while ((de = readdir(d)) != NULL) {
1377 unsigned char sha1[20];
1378 struct stat st;
1379 int flag;
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]1380
Michael Haggertyd5fdae62012-04-24 22:45:07[diff] [blame]1381 if (de->d_name[0] == '.')
1382 continue;
Jeff King2975c772014-06-30 16:58:25[diff] [blame]1383 if (ends_with(de->d_name, ".lock"))
Michael Haggertyd5fdae62012-04-24 22:45:07[diff] [blame]1384 continue;
Michael Haggerty72b64b42012-04-24 22:45:08[diff] [blame]1385 strbuf_addstr(&refname, de->d_name);
Jeff Kingf5b2dec2015-08-10 09:36:19[diff] [blame]1386 strbuf_addstr(&path, de->d_name);
1387 if (stat(path.buf, &st) < 0) {
Michael Haggerty72b64b42012-04-24 22:45:08[diff] [blame]1388 ; /* silently ignore */
1389 } else if (S_ISDIR(st.st_mode)) {
Michael Haggertyabc39092012-04-24 22:45:10[diff] [blame]1390 strbuf_addch(&refname, '/');
Michael Haggerty28e6a342012-04-26 22:27:07[diff] [blame]1391 add_entry_to_dir(dir,
René Scharfeb9146f52012-05-22 18:50:52[diff] [blame]1392 create_dir_entry(refs, refname.buf,
1393 refname.len, 1));
Michael Haggerty72b64b42012-04-24 22:45:08[diff] [blame]1394 } else {
Michael Haggertyf5517072015-06-03 13:51:58[diff] [blame]1395 int read_ok;
1396
Michael Haggerty3b124822011-12-12 05:38:17[diff] [blame]1397 if (*refs->name) {
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]1398 hashclr(sha1);
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]1399 flag = 0;
Michael Haggertyf5517072015-06-03 13:51:58[diff] [blame]1400 read_ok = !resolve_gitlink_ref(refs->name,
1401 refname.buf, sha1);
1402 } else {
1403 read_ok = !read_ref_full(refname.buf,
1404 RESOLVE_REF_READING,
1405 sha1, &flag);
1406 }
1407
1408 if (!read_ok) {
Junio C Hamano09116a12011-11-17 00:54:32[diff] [blame]1409 hashclr(sha1);
1410 flag |= REF_ISBROKEN;
Michael Haggerty501cf472015-06-03 13:51:59[diff] [blame]1411 } else if (is_null_sha1(sha1)) {
1412 /*
1413 * It is so astronomically unlikely
1414 * that NULL_SHA1 is the SHA-1 of an
1415 * actual object that we consider its
1416 * appearance in a loose reference
1417 * file to be repo corruption
1418 * (probably due to a software bug).
1419 */
1420 flag |= REF_ISBROKEN;
Junio C Hamano09116a12011-11-17 00:54:32[diff] [blame]1421 }
Michael Haggertyf5517072015-06-03 13:51:58[diff] [blame]1422
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]1423 if (check_refname_format(refname.buf,
1424 REFNAME_ALLOW_ONELEVEL)) {
Jeff King03afcbe2015-04-16 09:03:26[diff] [blame]1425 if (!refname_is_safe(refname.buf))
1426 die("loose refname is dangerous: %s", refname.buf);
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]1427 hashclr(sha1);
1428 flag |= REF_BAD_NAME | REF_ISBROKEN;
1429 }
Michael Haggerty9f2fb4a2012-04-24 22:45:12[diff] [blame]1430 add_entry_to_dir(dir,
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]1431 create_ref_entry(refname.buf, sha1, flag, 0));
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]1432 }
Michael Haggerty66a3d202012-04-24 22:45:09[diff] [blame]1433 strbuf_setlen(&refname, dirnamelen);
Jeff Kingf5b2dec2015-08-10 09:36:19[diff] [blame]1434 strbuf_setlen(&path, path_baselen);
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]1435 }
Michael Haggerty72b64b42012-04-24 22:45:08[diff] [blame]1436 strbuf_release(&refname);
Jeff Kingf5b2dec2015-08-10 09:36:19[diff] [blame]1437 strbuf_release(&path);
Michael Haggertyd5fdae62012-04-24 22:45:07[diff] [blame]1438 closedir(d);
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]1439}
1440
Michael Haggertyd3177272012-04-10 05:30:24[diff] [blame]1441static struct ref_dir *get_loose_refs(struct ref_cache *refs)
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]1442{
Michael Haggertyd12229f2012-04-26 22:27:01[diff] [blame]1443 if (!refs->loose) {
Michael Haggerty28e6a342012-04-26 22:27:07[diff] [blame]1444 /*
1445 * Mark the top-level directory complete because we
1446 * are about to read the only subdirectory that can
1447 * hold references:
1448 */
René Scharfeb9146f52012-05-22 18:50:52[diff] [blame]1449 refs->loose = create_dir_entry(refs, "", 0, 0);
Michael Haggerty28e6a342012-04-26 22:27:07[diff] [blame]1450 /*
1451 * Create an incomplete entry for "refs/":
1452 */
1453 add_entry_to_dir(get_ref_dir(refs->loose),
René Scharfeb9146f52012-05-22 18:50:52[diff] [blame]1454 create_dir_entry(refs, "refs/", 5, 1));
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]1455 }
Michael Haggertyd7826d52012-04-26 22:27:03[diff] [blame]1456 return get_ref_dir(refs->loose);
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]1457}
1458
Linus Torvaldsca8db142005-09-25 16:59:37[diff] [blame]1459/* We allow "recursive" symbolic refs. Only within reason, though */
1460#define MAXDEPTH 5
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]1461#define MAXREFLEN (1024)
1462
Junio C Hamanoe5fa45c2011-10-17 18:43:30[diff] [blame]1463/*
1464 * Called by resolve_gitlink_ref_recursive() after it failed to read
Michael Haggertyb0626602011-12-12 05:38:19[diff] [blame]1465 * from the loose refs in ref_cache refs. Find <refname> in the
1466 * packed-refs file for the submodule.
Junio C Hamanoe5fa45c2011-10-17 18:43:30[diff] [blame]1467 */
Michael Haggertyb0626602011-12-12 05:38:19[diff] [blame]1468static int resolve_gitlink_packed_ref(struct ref_cache *refs,
Michael Haggerty85be1fe2011-12-12 05:38:10[diff] [blame]1469 const char *refname, unsigned char *sha1)
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]1470{
Junio C Hamano2c5c66b2011-10-10 22:56:19[diff] [blame]1471 struct ref_entry *ref;
Michael Haggertyd3177272012-04-10 05:30:24[diff] [blame]1472 struct ref_dir *dir = get_packed_refs(refs);
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]1473
Michael Haggerty432ad412012-04-10 05:30:26[diff] [blame]1474 ref = find_ref(dir, refname);
Michael Haggertyb0626602011-12-12 05:38:19[diff] [blame]1475 if (ref == NULL)
1476 return -1;
1477
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]1478 hashcpy(sha1, ref->u.value.oid.hash);
Michael Haggertyb0626602011-12-12 05:38:19[diff] [blame]1479 return 0;
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]1480}
1481
Michael Haggertyb0626602011-12-12 05:38:19[diff] [blame]1482static int resolve_gitlink_ref_recursive(struct ref_cache *refs,
Michael Haggerty85be1fe2011-12-12 05:38:10[diff] [blame]1483 const char *refname, unsigned char *sha1,
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]1484 int recursion)
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]1485{
Michael Haggerty064d51d2011-12-12 05:38:20[diff] [blame]1486 int fd, len;
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]1487 char buffer[128], *p;
Jeff Kingfcd12db2015-08-10 09:35:31[diff] [blame]1488 char *path;
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]1489
Michael Haggerty064d51d2011-12-12 05:38:20[diff] [blame]1490 if (recursion > MAXDEPTH || strlen(refname) > MAXREFLEN)
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]1491 return -1;
Michael Haggerty064d51d2011-12-12 05:38:20[diff] [blame]1492 path = *refs->name
Jeff Kingfcd12db2015-08-10 09:35:31[diff] [blame]1493 ? git_pathdup_submodule(refs->name, "%s", refname)
1494 : git_pathdup("%s", refname);
Michael Haggerty064d51d2011-12-12 05:38:20[diff] [blame]1495 fd = open(path, O_RDONLY);
Jeff Kingfcd12db2015-08-10 09:35:31[diff] [blame]1496 free(path);
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]1497 if (fd < 0)
Michael Haggertyb0626602011-12-12 05:38:19[diff] [blame]1498 return resolve_gitlink_packed_ref(refs, refname, sha1);
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]1499
1500 len = read(fd, buffer, sizeof(buffer)-1);
1501 close(fd);
1502 if (len < 0)
1503 return -1;
1504 while (len && isspace(buffer[len-1]))
1505 len--;
1506 buffer[len] = 0;
1507
1508 /* Was it a detached head or an old-fashioned symlink? */
Michael Haggerty85be1fe2011-12-12 05:38:10[diff] [blame]1509 if (!get_sha1_hex(buffer, sha1))
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]1510 return 0;
1511
1512 /* Symref? */
1513 if (strncmp(buffer, "ref:", 4))
1514 return -1;
1515 p = buffer + 4;
1516 while (isspace(*p))
1517 p++;
1518
Michael Haggerty064d51d2011-12-12 05:38:20[diff] [blame]1519 return resolve_gitlink_ref_recursive(refs, p, sha1, recursion+1);
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]1520}
1521
Michael Haggerty85be1fe2011-12-12 05:38:10[diff] [blame]1522int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1)
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]1523{
1524 int len = strlen(path), retval;
Michael Haggerty064d51d2011-12-12 05:38:20[diff] [blame]1525 char *submodule;
Michael Haggertyb0626602011-12-12 05:38:19[diff] [blame]1526 struct ref_cache *refs;
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]1527
1528 while (len && path[len-1] == '/')
1529 len--;
1530 if (!len)
1531 return -1;
Michael Haggertyb0626602011-12-12 05:38:19[diff] [blame]1532 submodule = xstrndup(path, len);
1533 refs = get_ref_cache(submodule);
1534 free(submodule);
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]1535
Michael Haggerty064d51d2011-12-12 05:38:20[diff] [blame]1536 retval = resolve_gitlink_ref_recursive(refs, refname, sha1, 0);
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]1537 return retval;
1538}
Linus Torvaldsca8db142005-09-25 16:59:37[diff] [blame]1539
Christian Couder4886b892008-09-09 05:10:56[diff] [blame]1540/*
Michael Haggerty63331582013-04-22 19:52:15[diff] [blame]1541 * Return the ref_entry for the given refname from the packed
1542 * references. If it does not exist, return NULL.
Christian Couder4886b892008-09-09 05:10:56[diff] [blame]1543 */
Michael Haggerty63331582013-04-22 19:52:15[diff] [blame]1544static struct ref_entry *get_packed_ref(const char *refname)
Michael Haggertyc224ca72011-09-15 21:10:35[diff] [blame]1545{
Michael Haggerty9da31cb2013-04-22 19:52:41[diff] [blame]1546 return find_ref(get_packed_refs(&ref_cache), refname);
Michael Haggertyc224ca72011-09-15 21:10:35[diff] [blame]1547}
1548
Michael Haggerty47f534b2013-06-19 06:36:26[diff] [blame]1549/*
1550 * A loose ref file doesn't exist; check for a packed ref. The
1551 * options are forwarded from resolve_safe_unsafe().
1552 */
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]1553static int resolve_missing_loose_ref(const char *refname,
1554 int resolve_flags,
1555 unsigned char *sha1,
1556 int *flags)
Michael Haggerty47f534b2013-06-19 06:36:26[diff] [blame]1557{
1558 struct ref_entry *entry;
1559
1560 /*
1561 * The loose reference file does not exist; check for a packed
1562 * reference.
1563 */
1564 entry = get_packed_ref(refname);
1565 if (entry) {
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]1566 hashcpy(sha1, entry->u.value.oid.hash);
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]1567 if (flags)
1568 *flags |= REF_ISPACKED;
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]1569 return 0;
Michael Haggerty47f534b2013-06-19 06:36:26[diff] [blame]1570 }
1571 /* The reference is not a packed reference, either. */
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]1572 if (resolve_flags & RESOLVE_REF_READING) {
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]1573 errno = ENOENT;
1574 return -1;
Michael Haggerty47f534b2013-06-19 06:36:26[diff] [blame]1575 } else {
1576 hashclr(sha1);
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]1577 return 0;
Michael Haggerty47f534b2013-06-19 06:36:26[diff] [blame]1578 }
1579}
1580
Ronnie Sahlberg76d70dc2014-06-20 14:42:54[diff] [blame]1581/* This function needs to return a meaningful errno on failure */
Nguyễn Thái Ngọc Duy1a83c242014-11-30 08:24:28[diff] [blame]1582static const char *resolve_ref_unsafe_1(const char *refname,
1583 int resolve_flags,
1584 unsigned char *sha1,
1585 int *flags,
1586 struct strbuf *sb_path)
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]1587{
Heikki Orsila0104ca02008-04-27 18:21:58[diff] [blame]1588 int depth = MAXDEPTH;
1589 ssize_t len;
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]1590 char buffer[256];
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]1591 static char refname_buffer[256];
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]1592 int bad_name = 0;
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]1593
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]1594 if (flags)
1595 *flags = 0;
Junio C Hamano8da19772006-09-21 05:02:01[diff] [blame]1596
Ronnie Sahlberg76d70dc2014-06-20 14:42:54[diff] [blame]1597 if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]1598 if (flags)
1599 *flags |= REF_BAD_NAME;
1600
1601 if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
1602 !refname_is_safe(refname)) {
1603 errno = EINVAL;
1604 return NULL;
1605 }
1606 /*
1607 * dwim_ref() uses REF_ISBROKEN to distinguish between
1608 * missing refs and refs that were present but invalid,
1609 * to complain about the latter to stderr.
1610 *
1611 * We don't know whether the ref exists, so don't set
1612 * REF_ISBROKEN yet.
1613 */
1614 bad_name = 1;
Ronnie Sahlberg76d70dc2014-06-20 14:42:54[diff] [blame]1615 }
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]1616 for (;;) {
Nguyễn Thái Ngọc Duy1a83c242014-11-30 08:24:28[diff] [blame]1617 const char *path;
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]1618 struct stat st;
1619 char *buf;
1620 int fd;
1621
Ronnie Sahlberg76d70dc2014-06-20 14:42:54[diff] [blame]1622 if (--depth < 0) {
1623 errno = ELOOP;
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]1624 return NULL;
Ronnie Sahlberg76d70dc2014-06-20 14:42:54[diff] [blame]1625 }
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]1626
Nguyễn Thái Ngọc Duy1a83c242014-11-30 08:24:28[diff] [blame]1627 strbuf_reset(sb_path);
1628 strbuf_git_path(sb_path, "%s", refname);
1629 path = sb_path->buf;
Michael Haggertyc224ca72011-09-15 21:10:35[diff] [blame]1630
Michael Haggertyfcb7c762013-06-19 06:36:28[diff] [blame]1631 /*
1632 * We might have to loop back here to avoid a race
1633 * condition: first we lstat() the file, then we try
1634 * to read it as a link or as a file. But if somebody
1635 * changes the type of the file (file <-> directory
1636 * <-> symlink) between the lstat() and reading, then
1637 * we don't want to report that as an error but rather
1638 * try again starting with the lstat().
1639 */
1640 stat_ref:
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]1641 if (lstat(path, &st) < 0) {
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]1642 if (errno != ENOENT)
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]1643 return NULL;
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]1644 if (resolve_missing_loose_ref(refname, resolve_flags,
1645 sha1, flags))
1646 return NULL;
1647 if (bad_name) {
1648 hashclr(sha1);
1649 if (flags)
1650 *flags |= REF_ISBROKEN;
1651 }
1652 return refname;
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]1653 }
1654
1655 /* Follow "normalized" - ie "refs/.." symlinks by hand */
1656 if (S_ISLNK(st.st_mode)) {
1657 len = readlink(path, buffer, sizeof(buffer)-1);
Michael Haggertyfcb7c762013-06-19 06:36:28[diff] [blame]1658 if (len < 0) {
1659 if (errno == ENOENT || errno == EINVAL)
1660 /* inconsistent with lstat; retry */
1661 goto stat_ref;
1662 else
1663 return NULL;
1664 }
Michael Haggertyb54cb792011-09-15 21:10:32[diff] [blame]1665 buffer[len] = 0;
Christian Couder59556542013-11-30 20:55:40[diff] [blame]1666 if (starts_with(buffer, "refs/") &&
Michael Haggerty1f58a032011-09-15 21:10:33[diff] [blame]1667 !check_refname_format(buffer, 0)) {
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]1668 strcpy(refname_buffer, buffer);
1669 refname = refname_buffer;
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]1670 if (flags)
1671 *flags |= REF_ISSYMREF;
Jonathan Nieder62a2d522014-09-11 01:22:48[diff] [blame]1672 if (resolve_flags & RESOLVE_REF_NO_RECURSE) {
1673 hashclr(sha1);
1674 return refname;
1675 }
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]1676 continue;
1677 }
1678 }
1679
Dennis Stosberg7a216322006-10-02 17:23:53[diff] [blame]1680 /* Is it a directory? */
1681 if (S_ISDIR(st.st_mode)) {
1682 errno = EISDIR;
1683 return NULL;
1684 }
1685
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]1686 /*
1687 * Anything else, just open it and try to use it as
1688 * a ref
1689 */
1690 fd = open(path, O_RDONLY);
Michael Haggertyfcb7c762013-06-19 06:36:28[diff] [blame]1691 if (fd < 0) {
1692 if (errno == ENOENT)
1693 /* inconsistent with lstat; retry */
1694 goto stat_ref;
1695 else
1696 return NULL;
1697 }
Andy Whitcroft93d26e42007-01-08 15:58:08[diff] [blame]1698 len = read_in_full(fd, buffer, sizeof(buffer)-1);
Ronnie Sahlberg76d70dc2014-06-20 14:42:54[diff] [blame]1699 if (len < 0) {
1700 int save_errno = errno;
1701 close(fd);
1702 errno = save_errno;
Michael Haggerty28775052011-09-15 21:10:34[diff] [blame]1703 return NULL;
Ronnie Sahlberg76d70dc2014-06-20 14:42:54[diff] [blame]1704 }
1705 close(fd);
Michael Haggerty28775052011-09-15 21:10:34[diff] [blame]1706 while (len && isspace(buffer[len-1]))
1707 len--;
1708 buffer[len] = '\0';
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]1709
1710 /*
1711 * Is it a symbolic ref?
1712 */
Christian Couder59556542013-11-30 20:55:40[diff] [blame]1713 if (!starts_with(buffer, "ref:")) {
Michael Haggerty2884c062013-06-19 06:36:27[diff] [blame]1714 /*
1715 * Please note that FETCH_HEAD has a second
1716 * line containing other data.
1717 */
1718 if (get_sha1_hex(buffer, sha1) ||
1719 (buffer[40] != '\0' && !isspace(buffer[40]))) {
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]1720 if (flags)
1721 *flags |= REF_ISBROKEN;
Ronnie Sahlberg76d70dc2014-06-20 14:42:54[diff] [blame]1722 errno = EINVAL;
Michael Haggerty2884c062013-06-19 06:36:27[diff] [blame]1723 return NULL;
1724 }
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]1725 if (bad_name) {
1726 hashclr(sha1);
1727 if (flags)
1728 *flags |= REF_ISBROKEN;
1729 }
Michael Haggerty2884c062013-06-19 06:36:27[diff] [blame]1730 return refname;
1731 }
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]1732 if (flags)
1733 *flags |= REF_ISSYMREF;
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]1734 buf = buffer + 4;
Michael Haggerty28775052011-09-15 21:10:34[diff] [blame]1735 while (isspace(*buf))
1736 buf++;
Jonathan Nieder62a2d522014-09-11 01:22:48[diff] [blame]1737 refname = strcpy(refname_buffer, buf);
1738 if (resolve_flags & RESOLVE_REF_NO_RECURSE) {
1739 hashclr(sha1);
1740 return refname;
1741 }
Michael Haggerty313fb012011-09-15 21:10:36[diff] [blame]1742 if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) {
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]1743 if (flags)
1744 *flags |= REF_ISBROKEN;
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]1745
1746 if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
1747 !refname_is_safe(buf)) {
1748 errno = EINVAL;
1749 return NULL;
1750 }
1751 bad_name = 1;
Michael Haggerty313fb012011-09-15 21:10:36[diff] [blame]1752 }
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]1753 }
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]1754}
1755
Nguyễn Thái Ngọc Duy1a83c242014-11-30 08:24:28[diff] [blame]1756const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
1757 unsigned char *sha1, int *flags)
1758{
1759 struct strbuf sb_path = STRBUF_INIT;
1760 const char *ret = resolve_ref_unsafe_1(refname, resolve_flags,
1761 sha1, flags, &sb_path);
1762 strbuf_release(&sb_path);
1763 return ret;
1764}
1765
Michael Haggertyfb58c8d2015-06-22 14:03:05[diff] [blame]1766char *resolve_refdup(const char *refname, int resolve_flags,
1767 unsigned char *sha1, int *flags)
Nguyễn Thái Ngọc Duy96ec7b12011-12-13 14:17:48[diff] [blame]1768{
Michael Haggertyfb58c8d2015-06-22 14:03:05[diff] [blame]1769 return xstrdup_or_null(resolve_ref_unsafe(refname, resolve_flags,
1770 sha1, flags));
Nguyễn Thái Ngọc Duy96ec7b12011-12-13 14:17:48[diff] [blame]1771}
1772
Ilari Liusvaarad08bae72010-01-20 09:48:25[diff] [blame]1773/* The argument to filter_refs */
1774struct ref_filter {
1775 const char *pattern;
1776 each_ref_fn *fn;
1777 void *cb_data;
1778};
1779
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]1780int read_ref_full(const char *refname, int resolve_flags, unsigned char *sha1, int *flags)
Linus Torvalds8a65ff72005-07-03 03:23:36[diff] [blame]1781{
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]1782 if (resolve_ref_unsafe(refname, resolve_flags, sha1, flags))
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]1783 return 0;
1784 return -1;
Linus Torvalds8a65ff72005-07-03 03:23:36[diff] [blame]1785}
1786
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]1787int read_ref(const char *refname, unsigned char *sha1)
Nguyễn Thái Ngọc Duyc6893322011-11-13 10:22:14[diff] [blame]1788{
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]1789 return read_ref_full(refname, RESOLVE_REF_READING, sha1, NULL);
Nguyễn Thái Ngọc Duyc6893322011-11-13 10:22:14[diff] [blame]1790}
1791
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1792int ref_exists(const char *refname)
Junio C Hamanoef06b912006-11-19 06:13:33[diff] [blame]1793{
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1794 unsigned char sha1[20];
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]1795 return !!resolve_ref_unsafe(refname, RESOLVE_REF_READING, sha1, NULL);
Junio C Hamanoef06b912006-11-19 06:13:33[diff] [blame]1796}
1797
Michael Haggerty2b2a5be2015-05-25 18:38:28[diff] [blame]1798static int filter_refs(const char *refname, const struct object_id *oid,
Michael Haggerty4e675d12015-05-25 18:39:21[diff] [blame]1799 int flags, void *data)
Ilari Liusvaarad08bae72010-01-20 09:48:25[diff] [blame]1800{
1801 struct ref_filter *filter = (struct ref_filter *)data;
Michael Haggerty2b2a5be2015-05-25 18:38:28[diff] [blame]1802
Nguyễn Thái Ngọc Duyeb078942014-02-15 02:01:46[diff] [blame]1803 if (wildmatch(filter->pattern, refname, 0, NULL))
Ilari Liusvaarad08bae72010-01-20 09:48:25[diff] [blame]1804 return 0;
Michael Haggerty2b2a5be2015-05-25 18:38:28[diff] [blame]1805 return filter->fn(refname, oid, flags, filter->cb_data);
Ilari Liusvaarad08bae72010-01-20 09:48:25[diff] [blame]1806}
1807
Michael Haggerty68cf8702013-04-22 19:52:20[diff] [blame]1808enum peel_status {
1809 /* object was peeled successfully: */
1810 PEEL_PEELED = 0,
1811
1812 /*
1813 * object cannot be peeled because the named object (or an
1814 * object referred to by a tag in the peel chain), does not
1815 * exist.
1816 */
1817 PEEL_INVALID = -1,
1818
1819 /* object cannot be peeled because it is not a tag: */
Michael Haggerty9a489f32013-04-22 19:52:22[diff] [blame]1820 PEEL_NON_TAG = -2,
1821
1822 /* ref_entry contains no peeled value because it is a symref: */
1823 PEEL_IS_SYMREF = -3,
1824
1825 /*
1826 * ref_entry cannot be peeled because it is broken (i.e., the
1827 * symbolic reference cannot even be resolved to an object
1828 * name):
1829 */
1830 PEEL_BROKEN = -4
Michael Haggerty68cf8702013-04-22 19:52:20[diff] [blame]1831};
1832
Michael Haggertycb2ae1c2013-04-22 19:52:19[diff] [blame]1833/*
1834 * Peel the named object; i.e., if the object is a tag, resolve the
Michael Haggerty68cf8702013-04-22 19:52:20[diff] [blame]1835 * tag recursively until a non-tag is found. If successful, store the
1836 * result to sha1 and return PEEL_PEELED. If the object is not a tag
1837 * or is not valid, return PEEL_NON_TAG or PEEL_INVALID, respectively,
1838 * and leave sha1 unchanged.
Michael Haggertycb2ae1c2013-04-22 19:52:19[diff] [blame]1839 */
Michael Haggerty68cf8702013-04-22 19:52:20[diff] [blame]1840static enum peel_status peel_object(const unsigned char *name, unsigned char *sha1)
Michael Haggertycb2ae1c2013-04-22 19:52:19[diff] [blame]1841{
1842 struct object *o = lookup_unknown_object(name);
1843
1844 if (o->type == OBJ_NONE) {
1845 int type = sha1_object_info(name, NULL);
Jeff King8ff226a2014-07-13 06:42:03[diff] [blame]1846 if (type < 0 || !object_as_type(o, type, 0))
Michael Haggerty68cf8702013-04-22 19:52:20[diff] [blame]1847 return PEEL_INVALID;
Michael Haggertycb2ae1c2013-04-22 19:52:19[diff] [blame]1848 }
1849
1850 if (o->type != OBJ_TAG)
Michael Haggerty68cf8702013-04-22 19:52:20[diff] [blame]1851 return PEEL_NON_TAG;
Michael Haggertycb2ae1c2013-04-22 19:52:19[diff] [blame]1852
1853 o = deref_tag_noverify(o);
1854 if (!o)
Michael Haggerty68cf8702013-04-22 19:52:20[diff] [blame]1855 return PEEL_INVALID;
Michael Haggertycb2ae1c2013-04-22 19:52:19[diff] [blame]1856
1857 hashcpy(sha1, o->sha1);
Michael Haggerty68cf8702013-04-22 19:52:20[diff] [blame]1858 return PEEL_PEELED;
Michael Haggertycb2ae1c2013-04-22 19:52:19[diff] [blame]1859}
1860
Michael Haggerty9a489f32013-04-22 19:52:22[diff] [blame]1861/*
Michael Haggertyf85354b2013-04-22 19:52:37[diff] [blame]1862 * Peel the entry (if possible) and return its new peel_status. If
1863 * repeel is true, re-peel the entry even if there is an old peeled
1864 * value that is already stored in it.
Michael Haggerty694b7a12013-04-22 19:52:29[diff] [blame]1865 *
1866 * It is OK to call this function with a packed reference entry that
1867 * might be stale and might even refer to an object that has since
1868 * been garbage-collected. In such a case, if the entry has
1869 * REF_KNOWS_PEELED then leave the status unchanged and return
1870 * PEEL_PEELED or PEEL_NON_TAG; otherwise, return PEEL_INVALID.
Michael Haggerty9a489f32013-04-22 19:52:22[diff] [blame]1871 */
Michael Haggertyf85354b2013-04-22 19:52:37[diff] [blame]1872static enum peel_status peel_entry(struct ref_entry *entry, int repeel)
Michael Haggerty9a489f32013-04-22 19:52:22[diff] [blame]1873{
1874 enum peel_status status;
1875
Michael Haggertyf85354b2013-04-22 19:52:37[diff] [blame]1876 if (entry->flag & REF_KNOWS_PEELED) {
1877 if (repeel) {
1878 entry->flag &= ~REF_KNOWS_PEELED;
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]1879 oidclr(&entry->u.value.peeled);
Michael Haggertyf85354b2013-04-22 19:52:37[diff] [blame]1880 } else {
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]1881 return is_null_oid(&entry->u.value.peeled) ?
Michael Haggertyf85354b2013-04-22 19:52:37[diff] [blame]1882 PEEL_NON_TAG : PEEL_PEELED;
1883 }
1884 }
Michael Haggerty9a489f32013-04-22 19:52:22[diff] [blame]1885 if (entry->flag & REF_ISBROKEN)
1886 return PEEL_BROKEN;
1887 if (entry->flag & REF_ISSYMREF)
1888 return PEEL_IS_SYMREF;
1889
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]1890 status = peel_object(entry->u.value.oid.hash, entry->u.value.peeled.hash);
Michael Haggerty9a489f32013-04-22 19:52:22[diff] [blame]1891 if (status == PEEL_PEELED || status == PEEL_NON_TAG)
1892 entry->flag |= REF_KNOWS_PEELED;
1893 return status;
1894}
1895
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]1896int peel_ref(const char *refname, unsigned char *sha1)
Junio C Hamanocf0adba2006-11-19 21:22:44[diff] [blame]1897{
1898 int flag;
1899 unsigned char base[20];
Junio C Hamanocf0adba2006-11-19 21:22:44[diff] [blame]1900
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]1901 if (current_ref && (current_ref->name == refname
Michael Haggerty9a489f32013-04-22 19:52:22[diff] [blame]1902 || !strcmp(current_ref->name, refname))) {
Michael Haggertyf85354b2013-04-22 19:52:37[diff] [blame]1903 if (peel_entry(current_ref, 0))
Michael Haggerty9a489f32013-04-22 19:52:22[diff] [blame]1904 return -1;
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]1905 hashcpy(sha1, current_ref->u.value.peeled.hash);
Michael Haggerty9a489f32013-04-22 19:52:22[diff] [blame]1906 return 0;
Shawn O. Pearce0ae91be2008-02-24 08:07:22[diff] [blame]1907 }
1908
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]1909 if (read_ref_full(refname, RESOLVE_REF_READING, base, &flag))
Junio C Hamanocf0adba2006-11-19 21:22:44[diff] [blame]1910 return -1;
1911
Michael Haggerty9a489f32013-04-22 19:52:22[diff] [blame]1912 /*
1913 * If the reference is packed, read its ref_entry from the
1914 * cache in the hope that we already know its peeled value.
1915 * We only try this optimization on packed references because
1916 * (a) forcing the filling of the loose reference cache could
1917 * be expensive and (b) loose references anyway usually do not
1918 * have REF_KNOWS_PEELED.
1919 */
1920 if (flag & REF_ISPACKED) {
Michael Haggertyf361bae2013-04-22 19:52:16[diff] [blame]1921 struct ref_entry *r = get_packed_ref(refname);
Michael Haggerty9a489f32013-04-22 19:52:22[diff] [blame]1922 if (r) {
Michael Haggertyf85354b2013-04-22 19:52:37[diff] [blame]1923 if (peel_entry(r, 0))
Michael Haggerty9a489f32013-04-22 19:52:22[diff] [blame]1924 return -1;
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]1925 hashcpy(sha1, r->u.value.peeled.hash);
Julian Phillipse9c4c112011-09-29 22:11:42[diff] [blame]1926 return 0;
Junio C Hamanocf0adba2006-11-19 21:22:44[diff] [blame]1927 }
Junio C Hamanocf0adba2006-11-19 21:22:44[diff] [blame]1928 }
1929
Michael Haggertycb2ae1c2013-04-22 19:52:19[diff] [blame]1930 return peel_object(base, sha1);
Junio C Hamanocf0adba2006-11-19 21:22:44[diff] [blame]1931}
1932
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1933struct warn_if_dangling_data {
1934 FILE *fp;
1935 const char *refname;
Jens Lindströme6bea662014-05-23 10:30:25[diff] [blame]1936 const struct string_list *refnames;
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1937 const char *msg_fmt;
1938};
1939
Michael Haggerty2b2a5be2015-05-25 18:38:28[diff] [blame]1940static int warn_if_dangling_symref(const char *refname, const struct object_id *oid,
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1941 int flags, void *cb_data)
1942{
1943 struct warn_if_dangling_data *d = cb_data;
1944 const char *resolves_to;
Michael Haggerty4e675d12015-05-25 18:39:21[diff] [blame]1945 struct object_id junk;
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1946
1947 if (!(flags & REF_ISSYMREF))
1948 return 0;
1949
Michael Haggerty4e675d12015-05-25 18:39:21[diff] [blame]1950 resolves_to = resolve_ref_unsafe(refname, 0, junk.hash, NULL);
Jens Lindströme6bea662014-05-23 10:30:25[diff] [blame]1951 if (!resolves_to
1952 || (d->refname
1953 ? strcmp(resolves_to, d->refname)
1954 : !string_list_has_string(d->refnames, resolves_to))) {
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1955 return 0;
Jens Lindströme6bea662014-05-23 10:30:25[diff] [blame]1956 }
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1957
1958 fprintf(d->fp, d->msg_fmt, refname);
Junio C Hamano1be65ed2012-05-02 20:51:35[diff] [blame]1959 fputc('\n', d->fp);
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1960 return 0;
1961}
1962
1963void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
1964{
1965 struct warn_if_dangling_data data;
1966
1967 data.fp = fp;
1968 data.refname = refname;
Jens Lindströme6bea662014-05-23 10:30:25[diff] [blame]1969 data.refnames = NULL;
1970 data.msg_fmt = msg_fmt;
1971 for_each_rawref(warn_if_dangling_symref, &data);
1972}
1973
1974void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames)
1975{
1976 struct warn_if_dangling_data data;
1977
1978 data.fp = fp;
1979 data.refname = NULL;
1980 data.refnames = refnames;
Michael Haggertybc5fd6d2012-04-10 05:30:13[diff] [blame]1981 data.msg_fmt = msg_fmt;
1982 for_each_rawref(warn_if_dangling_symref, &data);
1983}
1984
Michael Haggertyfcce1702013-04-22 19:52:11[diff] [blame]1985/*
Michael Haggerty65cf1022013-04-22 19:52:40[diff] [blame]1986 * Call fn for each reference in the specified ref_cache, omitting
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]1987 * references not in the containing_dir of base. fn is called for all
1988 * references, including broken ones. If fn ever returns a non-zero
Michael Haggertyfcce1702013-04-22 19:52:11[diff] [blame]1989 * value, stop the iteration and return that value; otherwise, return
1990 * 0.
1991 */
Michael Haggerty65cf1022013-04-22 19:52:40[diff] [blame]1992static int do_for_each_entry(struct ref_cache *refs, const char *base,
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]1993 each_ref_entry_fn fn, void *cb_data)
Linus Torvalds8a65ff72005-07-03 03:23:36[diff] [blame]1994{
Jeff King98eeb092013-06-20 08:37:53[diff] [blame]1995 struct packed_ref_cache *packed_ref_cache;
1996 struct ref_dir *loose_dir;
1997 struct ref_dir *packed_dir;
Michael Haggerty933ac032012-04-10 05:30:27[diff] [blame]1998 int retval = 0;
1999
Jeff King98eeb092013-06-20 08:37:53[diff] [blame]2000 /*
2001 * We must make sure that all loose refs are read before accessing the
2002 * packed-refs file; this avoids a race condition in which loose refs
2003 * are migrated to the packed-refs file by a simultaneous process, but
2004 * our in-memory view is from before the migration. get_packed_ref_cache()
2005 * takes care of making sure our view is up to date with what is on
2006 * disk.
2007 */
2008 loose_dir = get_loose_refs(refs);
2009 if (base && *base) {
2010 loose_dir = find_containing_dir(loose_dir, base, 0);
2011 }
2012 if (loose_dir)
2013 prime_ref_dir(loose_dir);
2014
2015 packed_ref_cache = get_packed_ref_cache(refs);
Michael Haggerty8baf2bb2013-06-20 08:37:48[diff] [blame]2016 acquire_packed_ref_cache(packed_ref_cache);
Jeff King98eeb092013-06-20 08:37:53[diff] [blame]2017 packed_dir = get_packed_ref_dir(packed_ref_cache);
Michael Haggerty933ac032012-04-10 05:30:27[diff] [blame]2018 if (base && *base) {
2019 packed_dir = find_containing_dir(packed_dir, base, 0);
Michael Haggerty933ac032012-04-10 05:30:27[diff] [blame]2020 }
2021
2022 if (packed_dir && loose_dir) {
2023 sort_ref_dir(packed_dir);
2024 sort_ref_dir(loose_dir);
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]2025 retval = do_for_each_entry_in_dirs(
2026 packed_dir, loose_dir, fn, cb_data);
Michael Haggerty933ac032012-04-10 05:30:27[diff] [blame]2027 } else if (packed_dir) {
2028 sort_ref_dir(packed_dir);
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]2029 retval = do_for_each_entry_in_dir(
2030 packed_dir, 0, fn, cb_data);
Michael Haggerty933ac032012-04-10 05:30:27[diff] [blame]2031 } else if (loose_dir) {
2032 sort_ref_dir(loose_dir);
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]2033 retval = do_for_each_entry_in_dir(
2034 loose_dir, 0, fn, cb_data);
Michael Haggerty933ac032012-04-10 05:30:27[diff] [blame]2035 }
2036
Michael Haggerty8baf2bb2013-06-20 08:37:48[diff] [blame]2037 release_packed_ref_cache(packed_ref_cache);
Michael Haggerty933ac032012-04-10 05:30:27[diff] [blame]2038 return retval;
Linus Torvalds8a65ff72005-07-03 03:23:36[diff] [blame]2039}
2040
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]2041/*
Michael Haggerty65cf1022013-04-22 19:52:40[diff] [blame]2042 * Call fn for each reference in the specified ref_cache for which the
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]2043 * refname begins with base. If trim is non-zero, then trim that many
2044 * characters off the beginning of each refname before passing the
2045 * refname to fn. flags can be DO_FOR_EACH_INCLUDE_BROKEN to include
2046 * broken references in the iteration. If fn ever returns a non-zero
2047 * value, stop the iteration and return that value; otherwise, return
2048 * 0.
2049 */
Michael Haggerty65cf1022013-04-22 19:52:40[diff] [blame]2050static int do_for_each_ref(struct ref_cache *refs, const char *base,
2051 each_ref_fn fn, int trim, int flags, void *cb_data)
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]2052{
2053 struct ref_entry_cb data;
2054 data.base = base;
2055 data.trim = trim;
2056 data.flags = flags;
2057 data.fn = fn;
2058 data.cb_data = cb_data;
2059
Jeff King49672f22015-03-20 18:43:06[diff] [blame]2060 if (ref_paranoia < 0)
2061 ref_paranoia = git_env_bool("GIT_REF_PARANOIA", 0);
2062 if (ref_paranoia)
2063 data.flags |= DO_FOR_EACH_INCLUDE_BROKEN;
2064
Michael Haggerty65cf1022013-04-22 19:52:40[diff] [blame]2065 return do_for_each_entry(refs, base, do_one_ref, &data);
Michael Haggerty624cac32013-04-22 19:52:23[diff] [blame]2066}
2067
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]2068static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data)
Linus Torvalds723c31f2005-07-05 18:31:32[diff] [blame]2069{
Michael Haggerty2b2a5be2015-05-25 18:38:28[diff] [blame]2070 struct object_id oid;
Junio C Hamano8da19772006-09-21 05:02:01[diff] [blame]2071 int flag;
2072
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]2073 if (submodule) {
Michael Haggerty2b2a5be2015-05-25 18:38:28[diff] [blame]2074 if (resolve_gitlink_ref(submodule, "HEAD", oid.hash) == 0)
2075 return fn("HEAD", &oid, 0, cb_data);
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]2076
2077 return 0;
2078 }
2079
Michael Haggerty2b2a5be2015-05-25 18:38:28[diff] [blame]2080 if (!read_ref_full("HEAD", RESOLVE_REF_READING, oid.hash, &flag))
2081 return fn("HEAD", &oid, flag, cb_data);
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]2082
Linus Torvalds2f34ba32005-07-05 22:45:00[diff] [blame]2083 return 0;
Linus Torvalds723c31f2005-07-05 18:31:32[diff] [blame]2084}
2085
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]2086int head_ref(each_ref_fn fn, void *cb_data)
2087{
2088 return do_head_ref(NULL, fn, cb_data);
2089}
2090
Heiko Voigt9ef6aeb2010-07-07 13:39:12[diff] [blame]2091int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
2092{
2093 return do_head_ref(submodule, fn, cb_data);
2094}
2095
Junio C Hamanocb5d7092006-09-21 04:47:42[diff] [blame]2096int for_each_ref(each_ref_fn fn, void *cb_data)
Linus Torvalds8a65ff72005-07-03 03:23:36[diff] [blame]2097{
Michael Haggerty9da31cb2013-04-22 19:52:41[diff] [blame]2098 return do_for_each_ref(&ref_cache, "", fn, 0, 0, cb_data);
Seana62be772006-05-14 01:43:00[diff] [blame]2099}
2100
Heiko Voigt9ef6aeb2010-07-07 13:39:12[diff] [blame]2101int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
2102{
Michael Haggerty65cf1022013-04-22 19:52:40[diff] [blame]2103 return do_for_each_ref(get_ref_cache(submodule), "", fn, 0, 0, cb_data);
Seana62be772006-05-14 01:43:00[diff] [blame]2104}
2105
Christian Couder2a8177b2009-03-30 03:07:15[diff] [blame]2106int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
2107{
Michael Haggerty9da31cb2013-04-22 19:52:41[diff] [blame]2108 return do_for_each_ref(&ref_cache, prefix, fn, strlen(prefix), 0, cb_data);
Christian Couder2a8177b2009-03-30 03:07:15[diff] [blame]2109}
2110
Heiko Voigt9ef6aeb2010-07-07 13:39:12[diff] [blame]2111int for_each_ref_in_submodule(const char *submodule, const char *prefix,
2112 each_ref_fn fn, void *cb_data)
2113{
Michael Haggerty65cf1022013-04-22 19:52:40[diff] [blame]2114 return do_for_each_ref(get_ref_cache(submodule), prefix, fn, strlen(prefix), 0, cb_data);
Christian Couder2a8177b2009-03-30 03:07:15[diff] [blame]2115}
2116
Junio C Hamanocb5d7092006-09-21 04:47:42[diff] [blame]2117int for_each_tag_ref(each_ref_fn fn, void *cb_data)
Seana62be772006-05-14 01:43:00[diff] [blame]2118{
Christian Couder2a8177b2009-03-30 03:07:15[diff] [blame]2119 return for_each_ref_in("refs/tags/", fn, cb_data);
Seana62be772006-05-14 01:43:00[diff] [blame]2120}
2121
Heiko Voigt9ef6aeb2010-07-07 13:39:12[diff] [blame]2122int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
2123{
2124 return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data);
2125}
2126
Junio C Hamanocb5d7092006-09-21 04:47:42[diff] [blame]2127int for_each_branch_ref(each_ref_fn fn, void *cb_data)
Seana62be772006-05-14 01:43:00[diff] [blame]2128{
Christian Couder2a8177b2009-03-30 03:07:15[diff] [blame]2129 return for_each_ref_in("refs/heads/", fn, cb_data);
Seana62be772006-05-14 01:43:00[diff] [blame]2130}
2131
Heiko Voigt9ef6aeb2010-07-07 13:39:12[diff] [blame]2132int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
2133{
2134 return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data);
2135}
2136
Junio C Hamanocb5d7092006-09-21 04:47:42[diff] [blame]2137int for_each_remote_ref(each_ref_fn fn, void *cb_data)
Seana62be772006-05-14 01:43:00[diff] [blame]2138{
Christian Couder2a8177b2009-03-30 03:07:15[diff] [blame]2139 return for_each_ref_in("refs/remotes/", fn, cb_data);
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]2140}
2141
Heiko Voigt9ef6aeb2010-07-07 13:39:12[diff] [blame]2142int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
2143{
2144 return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data);
2145}
2146
Christian Couder29268702009-01-23 09:06:38[diff] [blame]2147int for_each_replace_ref(each_ref_fn fn, void *cb_data)
2148{
Mike Hommey58d121b2015-06-11 21:34:59[diff] [blame]2149 return do_for_each_ref(&ref_cache, git_replace_ref_base, fn,
2150 strlen(git_replace_ref_base), 0, cb_data);
Christian Couder29268702009-01-23 09:06:38[diff] [blame]2151}
2152
Josh Tripletta1bea2c2011-07-05 17:54:44[diff] [blame]2153int head_ref_namespaced(each_ref_fn fn, void *cb_data)
2154{
2155 struct strbuf buf = STRBUF_INIT;
2156 int ret = 0;
Michael Haggerty2b2a5be2015-05-25 18:38:28[diff] [blame]2157 struct object_id oid;
Josh Tripletta1bea2c2011-07-05 17:54:44[diff] [blame]2158 int flag;
2159
2160 strbuf_addf(&buf, "%sHEAD", get_git_namespace());
Michael Haggerty2b2a5be2015-05-25 18:38:28[diff] [blame]2161 if (!read_ref_full(buf.buf, RESOLVE_REF_READING, oid.hash, &flag))
2162 ret = fn(buf.buf, &oid, flag, cb_data);
Josh Tripletta1bea2c2011-07-05 17:54:44[diff] [blame]2163 strbuf_release(&buf);
2164
2165 return ret;
2166}
2167
2168int for_each_namespaced_ref(each_ref_fn fn, void *cb_data)
2169{
2170 struct strbuf buf = STRBUF_INIT;
2171 int ret;
2172 strbuf_addf(&buf, "%srefs/", get_git_namespace());
Michael Haggerty9da31cb2013-04-22 19:52:41[diff] [blame]2173 ret = do_for_each_ref(&ref_cache, buf.buf, fn, 0, 0, cb_data);
Josh Tripletta1bea2c2011-07-05 17:54:44[diff] [blame]2174 strbuf_release(&buf);
2175 return ret;
2176}
2177
Ilari Liusvaarab09fe972010-01-20 09:48:26[diff] [blame]2178int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
2179 const char *prefix, void *cb_data)
Ilari Liusvaarad08bae72010-01-20 09:48:25[diff] [blame]2180{
2181 struct strbuf real_pattern = STRBUF_INIT;
2182 struct ref_filter filter;
Ilari Liusvaarad08bae72010-01-20 09:48:25[diff] [blame]2183 int ret;
2184
Christian Couder59556542013-11-30 20:55:40[diff] [blame]2185 if (!prefix && !starts_with(pattern, "refs/"))
Ilari Liusvaarad08bae72010-01-20 09:48:25[diff] [blame]2186 strbuf_addstr(&real_pattern, "refs/");
Ilari Liusvaarab09fe972010-01-20 09:48:26[diff] [blame]2187 else if (prefix)
2188 strbuf_addstr(&real_pattern, prefix);
Ilari Liusvaarad08bae72010-01-20 09:48:25[diff] [blame]2189 strbuf_addstr(&real_pattern, pattern);
2190
Thomas Rast894a9d32010-03-12 17:04:26[diff] [blame]2191 if (!has_glob_specials(pattern)) {
Junio C Hamano9517e6b2010-02-04 05:23:18[diff] [blame]2192 /* Append implied '/' '*' if not present. */
Ilari Liusvaarad08bae72010-01-20 09:48:25[diff] [blame]2193 if (real_pattern.buf[real_pattern.len - 1] != '/')
2194 strbuf_addch(&real_pattern, '/');
2195 /* No need to check for '*', there is none. */
2196 strbuf_addch(&real_pattern, '*');
2197 }
2198
2199 filter.pattern = real_pattern.buf;
2200 filter.fn = fn;
2201 filter.cb_data = cb_data;
2202 ret = for_each_ref(filter_refs, &filter);
2203
2204 strbuf_release(&real_pattern);
2205 return ret;
2206}
2207
Ilari Liusvaarab09fe972010-01-20 09:48:26[diff] [blame]2208int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data)
2209{
2210 return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
2211}
2212
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]2213int for_each_rawref(each_ref_fn fn, void *cb_data)
2214{
Michael Haggerty9da31cb2013-04-22 19:52:41[diff] [blame]2215 return do_for_each_ref(&ref_cache, "", fn, 0,
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]2216 DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
Linus Torvalds8a65ff72005-07-03 03:23:36[diff] [blame]2217}
2218
Felipe Contreras4577e482009-05-13 21:22:04[diff] [blame]2219const char *prettify_refname(const char *name)
Daniel Barkalowa9c37a72009-03-09 01:06:05[diff] [blame]2220{
Daniel Barkalowa9c37a72009-03-09 01:06:05[diff] [blame]2221 return name + (
Christian Couder59556542013-11-30 20:55:40[diff] [blame]2222 starts_with(name, "refs/heads/") ? 11 :
2223 starts_with(name, "refs/tags/") ? 10 :
2224 starts_with(name, "refs/remotes/") ? 13 :
Daniel Barkalowa9c37a72009-03-09 01:06:05[diff] [blame]2225 0);
2226}
2227
Michael Haggerty54457fe2014-01-14 03:16:07[diff] [blame]2228static const char *ref_rev_parse_rules[] = {
Steffen Prohaska79803322007-11-11 14:01:46[diff] [blame]2229 "%.*s",
2230 "refs/%.*s",
2231 "refs/tags/%.*s",
2232 "refs/heads/%.*s",
2233 "refs/remotes/%.*s",
2234 "refs/remotes/%.*s/HEAD",
2235 NULL
2236};
2237
Michael Haggerty54457fe2014-01-14 03:16:07[diff] [blame]2238int refname_match(const char *abbrev_name, const char *full_name)
Steffen Prohaska79803322007-11-11 14:01:46[diff] [blame]2239{
2240 const char **p;
2241 const int abbrev_name_len = strlen(abbrev_name);
2242
Michael Haggerty54457fe2014-01-14 03:16:07[diff] [blame]2243 for (p = ref_rev_parse_rules; *p; p++) {
Steffen Prohaska79803322007-11-11 14:01:46[diff] [blame]2244 if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
2245 return 1;
2246 }
2247 }
2248
2249 return 0;
2250}
2251
Ronnie Sahlberg0b1e6542014-12-12 08:57:00[diff] [blame]2252static void unlock_ref(struct ref_lock *lock)
2253{
2254 /* Do not free lock->lk -- atexit() still looks at them */
2255 if (lock->lk)
2256 rollback_lock_file(lock->lk);
2257 free(lock->ref_name);
2258 free(lock->orig_ref_name);
2259 free(lock);
2260}
2261
Michael Haggertya5e24992015-05-22 23:34:53[diff] [blame]2262/*
2263 * Verify that the reference locked by lock has the value old_sha1.
2264 * Fail if the reference doesn't exist and mustexist is set. Return 0
Michael Haggerty33ffc172015-05-22 23:34:55[diff] [blame]2265 * on success. On error, write an error message to err, set errno, and
2266 * return a negative value.
Michael Haggertya5e24992015-05-22 23:34:53[diff] [blame]2267 */
2268static int verify_lock(struct ref_lock *lock,
Michael Haggerty33ffc172015-05-22 23:34:55[diff] [blame]2269 const unsigned char *old_sha1, int mustexist,
2270 struct strbuf *err)
Daniel Barkalow95fc7512005-06-06 20:31:29[diff] [blame]2271{
Michael Haggerty33ffc172015-05-22 23:34:55[diff] [blame]2272 assert(err);
2273
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]2274 if (read_ref_full(lock->ref_name,
2275 mustexist ? RESOLVE_REF_READING : 0,
Michael Haggerty5cb901a2015-05-25 18:39:22[diff] [blame]2276 lock->old_oid.hash, NULL)) {
Ronnie Sahlberg835e3c92014-06-20 14:42:51[diff] [blame]2277 int save_errno = errno;
Michael Haggerty000f0da2015-05-22 23:34:56[diff] [blame]2278 strbuf_addf(err, "can't verify ref %s", lock->ref_name);
Ronnie Sahlberg835e3c92014-06-20 14:42:51[diff] [blame]2279 errno = save_errno;
Michael Haggertya5e24992015-05-22 23:34:53[diff] [blame]2280 return -1;
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]2281 }
Michael Haggerty5cb901a2015-05-25 18:39:22[diff] [blame]2282 if (hashcmp(lock->old_oid.hash, old_sha1)) {
Michael Haggerty000f0da2015-05-22 23:34:56[diff] [blame]2283 strbuf_addf(err, "ref %s is at %s but expected %s",
Michael Haggerty33ffc172015-05-22 23:34:55[diff] [blame]2284 lock->ref_name,
Junio C Hamano829f03e2015-06-11 16:29:54[diff] [blame]2285 sha1_to_hex(lock->old_oid.hash),
Michael Haggerty33ffc172015-05-22 23:34:55[diff] [blame]2286 sha1_to_hex(old_sha1));
Ronnie Sahlberg835e3c92014-06-20 14:42:51[diff] [blame]2287 errno = EBUSY;
Michael Haggertya5e24992015-05-22 23:34:53[diff] [blame]2288 return -1;
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]2289 }
Michael Haggertya5e24992015-05-22 23:34:53[diff] [blame]2290 return 0;
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]2291}
2292
Jeff King470e28d2015-08-10 09:37:27[diff] [blame]2293static int remove_empty_directories(struct strbuf *path)
Junio C Hamanobc7127e2006-09-30 09:25:30[diff] [blame]2294{
Jeff King470e28d2015-08-10 09:37:27[diff] [blame]2295 /*
2296 * we want to create a file but there is a directory there;
Junio C Hamanobc7127e2006-09-30 09:25:30[diff] [blame]2297 * if that is an empty directory (or a directory that contains
2298 * only empty directories), remove them.
2299 */
Jeff King470e28d2015-08-10 09:37:27[diff] [blame]2300 return remove_dir_recursively(path, REMOVE_DIR_EMPTY_ONLY);
Junio C Hamanobc7127e2006-09-30 09:25:30[diff] [blame]2301}
2302
Michael Haggerty19b68b12011-12-12 05:38:12[diff] [blame]2303/*
Junio C Hamanoff74f7f2011-10-12 17:35:38[diff] [blame]2304 * *string and *len will only be substituted, and *string returned (for
2305 * later free()ing) if the string passed in is a magic short-hand form
2306 * to name a branch.
2307 */
2308static char *substitute_branch_name(const char **string, int *len)
2309{
2310 struct strbuf buf = STRBUF_INIT;
Felipe Contrerascf99a762013-09-02 06:34:29[diff] [blame]2311 int ret = interpret_branch_name(*string, *len, &buf);
Junio C Hamanoff74f7f2011-10-12 17:35:38[diff] [blame]2312
2313 if (ret == *len) {
2314 size_t size;
2315 *string = strbuf_detach(&buf, &size);
2316 *len = size;
2317 return (char *)*string;
2318 }
2319
2320 return NULL;
2321}
2322
2323int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
2324{
2325 char *last_branch = substitute_branch_name(&str, &len);
2326 const char **p, *r;
2327 int refs_found = 0;
2328
2329 *ref = NULL;
2330 for (p = ref_rev_parse_rules; *p; p++) {
2331 char fullref[PATH_MAX];
2332 unsigned char sha1_from_ref[20];
2333 unsigned char *this_result;
2334 int flag;
2335
2336 this_result = refs_found ? sha1_from_ref : sha1;
2337 mksnpath(fullref, sizeof(fullref), *p, len, str);
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]2338 r = resolve_ref_unsafe(fullref, RESOLVE_REF_READING,
2339 this_result, &flag);
Junio C Hamanoff74f7f2011-10-12 17:35:38[diff] [blame]2340 if (r) {
2341 if (!refs_found++)
2342 *ref = xstrdup(r);
2343 if (!warn_ambiguous_refs)
2344 break;
Junio C Hamano55956352011-10-19 20:55:49[diff] [blame]2345 } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) {
Junio C Hamanoff74f7f2011-10-12 17:35:38[diff] [blame]2346 warning("ignoring dangling symref %s.", fullref);
Junio C Hamano55956352011-10-19 20:55:49[diff] [blame]2347 } else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) {
2348 warning("ignoring broken ref %s.", fullref);
2349 }
Junio C Hamanoff74f7f2011-10-12 17:35:38[diff] [blame]2350 }
2351 free(last_branch);
2352 return refs_found;
2353}
2354
2355int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
2356{
2357 char *last_branch = substitute_branch_name(&str, &len);
2358 const char **p;
2359 int logs_found = 0;
2360
2361 *log = NULL;
2362 for (p = ref_rev_parse_rules; *p; p++) {
Junio C Hamanoff74f7f2011-10-12 17:35:38[diff] [blame]2363 unsigned char hash[20];
2364 char path[PATH_MAX];
2365 const char *ref, *it;
2366
2367 mksnpath(path, sizeof(path), *p, len, str);
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]2368 ref = resolve_ref_unsafe(path, RESOLVE_REF_READING,
2369 hash, NULL);
Junio C Hamanoff74f7f2011-10-12 17:35:38[diff] [blame]2370 if (!ref)
2371 continue;
Ronnie Sahlberg4da58832014-05-06 22:45:52[diff] [blame]2372 if (reflog_exists(path))
Junio C Hamanoff74f7f2011-10-12 17:35:38[diff] [blame]2373 it = path;
Ronnie Sahlberg4da58832014-05-06 22:45:52[diff] [blame]2374 else if (strcmp(ref, path) && reflog_exists(ref))
Junio C Hamanoff74f7f2011-10-12 17:35:38[diff] [blame]2375 it = ref;
2376 else
2377 continue;
2378 if (!logs_found++) {
2379 *log = xstrdup(it);
2380 hashcpy(sha1, hash);
2381 }
2382 if (!warn_ambiguous_refs)
2383 break;
2384 }
2385 free(last_branch);
2386 return logs_found;
2387}
2388
Ronnie Sahlberg88b680a2014-04-28 22:38:47[diff] [blame]2389/*
Ronnie Sahlberg3c93c842014-10-02 14:59:02[diff] [blame]2390 * Locks a ref returning the lock on success and NULL on failure.
Ronnie Sahlberg88b680a2014-04-28 22:38:47[diff] [blame]2391 * On failure errno is set to something meaningful.
2392 */
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]2393static struct ref_lock *lock_ref_sha1_basic(const char *refname,
2394 const unsigned char *old_sha1,
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]2395 const struct string_list *extras,
Ronnie Sahlberg5fe7d822014-05-01 18:16:07[diff] [blame]2396 const struct string_list *skip,
Michael Haggerty4a32b2e2015-05-11 15:25:15[diff] [blame]2397 unsigned int flags, int *type_p,
2398 struct strbuf *err)
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]2399{
Jeff King5f8ef5b2015-08-10 09:37:12[diff] [blame]2400 struct strbuf ref_file = STRBUF_INIT;
2401 struct strbuf orig_ref_file = STRBUF_INIT;
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]2402 const char *orig_refname = refname;
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]2403 struct ref_lock *lock;
Junio C Hamano5cc3cef2006-09-30 21:14:31[diff] [blame]2404 int last_errno = 0;
Junio C Hamanoacd3b9e2008-10-17 22:44:39[diff] [blame]2405 int type, lflags;
Junio C Hamano4431fcc2006-09-27 08:09:18[diff] [blame]2406 int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]2407 int resolve_flags = 0;
Michael Haggertyc4c61c72014-01-18 22:48:54[diff] [blame]2408 int attempts_remaining = 3;
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]2409
Michael Haggerty4a32b2e2015-05-11 15:25:15[diff] [blame]2410 assert(err);
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]2411
2412 lock = xcalloc(1, sizeof(struct ref_lock));
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]2413
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]2414 if (mustexist)
2415 resolve_flags |= RESOLVE_REF_READING;
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]2416 if (flags & REF_DELETING) {
2417 resolve_flags |= RESOLVE_REF_ALLOW_BAD_NAME;
2418 if (flags & REF_NODEREF)
2419 resolve_flags |= RESOLVE_REF_NO_RECURSE;
2420 }
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]2421
2422 refname = resolve_ref_unsafe(refname, resolve_flags,
Michael Haggerty5cb901a2015-05-25 18:39:22[diff] [blame]2423 lock->old_oid.hash, &type);
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]2424 if (!refname && errno == EISDIR) {
Jeff King5f8ef5b2015-08-10 09:37:12[diff] [blame]2425 /*
2426 * we are trying to lock foo but we used to
Junio C Hamanobc7127e2006-09-30 09:25:30[diff] [blame]2427 * have foo/bar which now does not exist;
2428 * it is normal for the empty directory 'foo'
2429 * to remain.
2430 */
Jeff King5f8ef5b2015-08-10 09:37:12[diff] [blame]2431 strbuf_git_path(&orig_ref_file, "%s", orig_refname);
Jeff King470e28d2015-08-10 09:37:27[diff] [blame]2432 if (remove_empty_directories(&orig_ref_file)) {
Junio C Hamano5cc3cef2006-09-30 21:14:31[diff] [blame]2433 last_errno = errno;
Michael Haggerty5b2d8d62015-05-11 15:25:16[diff] [blame]2434 if (!verify_refname_available(orig_refname, extras, skip,
2435 get_loose_refs(&ref_cache), err))
2436 strbuf_addf(err, "there are still refs under '%s'",
2437 orig_refname);
Junio C Hamano5cc3cef2006-09-30 21:14:31[diff] [blame]2438 goto error_return;
2439 }
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]2440 refname = resolve_ref_unsafe(orig_refname, resolve_flags,
Michael Haggerty5cb901a2015-05-25 18:39:22[diff] [blame]2441 lock->old_oid.hash, &type);
Junio C Hamanobc7127e2006-09-30 09:25:30[diff] [blame]2442 }
Sven Verdoolaege68db31c2007-05-09 10:33:20[diff] [blame]2443 if (type_p)
2444 *type_p = type;
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]2445 if (!refname) {
Junio C Hamano5cc3cef2006-09-30 21:14:31[diff] [blame]2446 last_errno = errno;
Michael Haggerty5b2d8d62015-05-11 15:25:16[diff] [blame]2447 if (last_errno != ENOTDIR ||
2448 !verify_refname_available(orig_refname, extras, skip,
2449 get_loose_refs(&ref_cache), err))
2450 strbuf_addf(err, "unable to resolve reference %s: %s",
2451 orig_refname, strerror(last_errno));
2452
Junio C Hamano5cc3cef2006-09-30 21:14:31[diff] [blame]2453 goto error_return;
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]2454 }
Michael Haggerty074336e2015-03-02 09:29:53[diff] [blame]2455 /*
2456 * If the ref did not exist and we are creating it, make sure
2457 * there is no existing packed ref whose name begins with our
2458 * refname, nor a packed ref whose name is a proper prefix of
2459 * our refname.
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]2460 */
Michael Haggerty5cb901a2015-05-25 18:39:22[diff] [blame]2461 if (is_null_oid(&lock->old_oid) &&
Michael Haggerty1146f172015-05-11 15:25:14[diff] [blame]2462 verify_refname_available(refname, extras, skip,
Michael Haggerty4a32b2e2015-05-11 15:25:15[diff] [blame]2463 get_packed_refs(&ref_cache), err)) {
Jeff Kingf475e082009-05-25 10:37:15[diff] [blame]2464 last_errno = ENOTDIR;
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]2465 goto error_return;
Jeff Kingf475e082009-05-25 10:37:15[diff] [blame]2466 }
Junio C Hamano22a38442006-09-30 21:19:25[diff] [blame]2467
Junio C Hamanoc33d5172006-06-06 20:54:14[diff] [blame]2468 lock->lk = xcalloc(1, sizeof(struct lock_file));
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]2469
Michael Haggertye5c223e2014-01-18 22:48:55[diff] [blame]2470 lflags = 0;
Junio C Hamanoacd3b9e2008-10-17 22:44:39[diff] [blame]2471 if (flags & REF_NODEREF) {
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]2472 refname = orig_refname;
Michael Haggerty47ba4662014-10-01 10:28:37[diff] [blame]2473 lflags |= LOCK_NO_DEREF;
Junio C Hamanoacd3b9e2008-10-17 22:44:39[diff] [blame]2474 }
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]2475 lock->ref_name = xstrdup(refname);
2476 lock->orig_ref_name = xstrdup(orig_refname);
Jeff King5f8ef5b2015-08-10 09:37:12[diff] [blame]2477 strbuf_git_path(&ref_file, "%s", refname);
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]2478
Michael Haggertyc4c61c72014-01-18 22:48:54[diff] [blame]2479 retry:
Jeff King5f8ef5b2015-08-10 09:37:12[diff] [blame]2480 switch (safe_create_leading_directories_const(ref_file.buf)) {
Michael Haggertyc4c61c72014-01-18 22:48:54[diff] [blame]2481 case SCLD_OK:
2482 break; /* success */
2483 case SCLD_VANISHED:
2484 if (--attempts_remaining > 0)
2485 goto retry;
2486 /* fall through */
2487 default:
Junio C Hamano5cc3cef2006-09-30 21:14:31[diff] [blame]2488 last_errno = errno;
Jeff King5f8ef5b2015-08-10 09:37:12[diff] [blame]2489 strbuf_addf(err, "unable to create directory for %s",
2490 ref_file.buf);
Junio C Hamano5cc3cef2006-09-30 21:14:31[diff] [blame]2491 goto error_return;
2492 }
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]2493
Jeff King5f8ef5b2015-08-10 09:37:12[diff] [blame]2494 if (hold_lock_file_for_update(lock->lk, ref_file.buf, lflags) < 0) {
Ronnie Sahlberg06839512014-11-19 22:28:52[diff] [blame]2495 last_errno = errno;
Michael Haggertye5c223e2014-01-18 22:48:55[diff] [blame]2496 if (errno == ENOENT && --attempts_remaining > 0)
2497 /*
2498 * Maybe somebody just deleted one of the
2499 * directories leading to ref_file. Try
2500 * again:
2501 */
2502 goto retry;
Ronnie Sahlberg06839512014-11-19 22:28:52[diff] [blame]2503 else {
Jeff King5f8ef5b2015-08-10 09:37:12[diff] [blame]2504 unable_to_lock_message(ref_file.buf, errno, err);
Ronnie Sahlberg06839512014-11-19 22:28:52[diff] [blame]2505 goto error_return;
2506 }
Michael Haggertye5c223e2014-01-18 22:48:55[diff] [blame]2507 }
Michael Haggerty33ffc172015-05-22 23:34:55[diff] [blame]2508 if (old_sha1 && verify_lock(lock, old_sha1, mustexist, err)) {
Michael Haggertyf41d6322015-05-22 23:34:54[diff] [blame]2509 last_errno = errno;
2510 goto error_return;
2511 }
Jeff King5f8ef5b2015-08-10 09:37:12[diff] [blame]2512 goto out;
Junio C Hamano5cc3cef2006-09-30 21:14:31[diff] [blame]2513
2514 error_return:
2515 unlock_ref(lock);
Jeff King5f8ef5b2015-08-10 09:37:12[diff] [blame]2516 lock = NULL;
2517
2518 out:
2519 strbuf_release(&ref_file);
2520 strbuf_release(&orig_ref_file);
Junio C Hamano5cc3cef2006-09-30 21:14:31[diff] [blame]2521 errno = last_errno;
Jeff King5f8ef5b2015-08-10 09:37:12[diff] [blame]2522 return lock;
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]2523}
2524
Michael Haggertyfec31372013-04-22 19:52:30[diff] [blame]2525/*
2526 * Write an entry to the packed-refs file for the specified refname.
2527 * If peeled is non-NULL, write it as the entry's peeled value.
2528 */
Jeff King9540ce52014-09-10 10:03:52[diff] [blame]2529static void write_packed_entry(FILE *fh, char *refname, unsigned char *sha1,
Michael Haggertyfec31372013-04-22 19:52:30[diff] [blame]2530 unsigned char *peeled)
Michael Haggertyd66da472012-04-10 05:30:17[diff] [blame]2531{
Jeff King9540ce52014-09-10 10:03:52[diff] [blame]2532 fprintf_or_die(fh, "%s %s\n", sha1_to_hex(sha1), refname);
2533 if (peeled)
2534 fprintf_or_die(fh, "^%s\n", sha1_to_hex(peeled));
Michael Haggertyfec31372013-04-22 19:52:30[diff] [blame]2535}
2536
Michael Haggerty7b40d392013-06-20 08:37:43[diff] [blame]2537/*
2538 * An each_ref_entry_fn that writes the entry to a packed-refs file.
2539 */
2540static int write_packed_entry_fn(struct ref_entry *entry, void *cb_data)
2541{
Michael Haggerty7b40d392013-06-20 08:37:43[diff] [blame]2542 enum peel_status peel_status = peel_entry(entry, 0);
2543
2544 if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG)
2545 error("internal error: %s is not a valid packed reference!",
2546 entry->name);
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]2547 write_packed_entry(cb_data, entry->name, entry->u.value.oid.hash,
Michael Haggerty7b40d392013-06-20 08:37:43[diff] [blame]2548 peel_status == PEEL_PEELED ?
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]2549 entry->u.value.peeled.hash : NULL);
Michael Haggerty7b40d392013-06-20 08:37:43[diff] [blame]2550 return 0;
2551}
2552
Michael Haggerty0a4b24f2015-06-22 14:03:02[diff] [blame]2553/*
2554 * Lock the packed-refs file for writing. Flags is passed to
2555 * hold_lock_file_for_update(). Return 0 on success. On errors, set
2556 * errno appropriately and return a nonzero value.
2557 */
2558static int lock_packed_refs(int flags)
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2559{
Michael Haggertyf4ab4f32015-05-11 10:35:26[diff] [blame]2560 static int timeout_configured = 0;
2561 static int timeout_value = 1000;
2562
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2563 struct packed_ref_cache *packed_ref_cache;
2564
Michael Haggertyf4ab4f32015-05-11 10:35:26[diff] [blame]2565 if (!timeout_configured) {
2566 git_config_get_int("core.packedrefstimeout", &timeout_value);
2567 timeout_configured = 1;
2568 }
2569
2570 if (hold_lock_file_for_update_timeout(
2571 &packlock, git_path("packed-refs"),
2572 flags, timeout_value) < 0)
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2573 return -1;
Michael Haggerty5d478f52013-06-20 08:37:54[diff] [blame]2574 /*
2575 * Get the current packed-refs while holding the lock. If the
2576 * packed-refs file has been modified since we last read it,
2577 * this will automatically invalidate the cache and re-read
2578 * the packed-refs file.
2579 */
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2580 packed_ref_cache = get_packed_ref_cache(&ref_cache);
2581 packed_ref_cache->lock = &packlock;
Michael Haggerty4f6b83e2013-06-20 08:37:49[diff] [blame]2582 /* Increment the reference count to prevent it from being freed: */
2583 acquire_packed_ref_cache(packed_ref_cache);
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2584 return 0;
2585}
2586
Ronnie Sahlbergd3f66552014-06-20 14:42:53[diff] [blame]2587/*
Michael Haggerty0a4b24f2015-06-22 14:03:02[diff] [blame]2588 * Write the current version of the packed refs cache from memory to
2589 * disk. The packed-refs file must already be locked for writing (see
2590 * lock_packed_refs()). Return zero on success. On errors, set errno
2591 * and return a nonzero value
Ronnie Sahlbergd3f66552014-06-20 14:42:53[diff] [blame]2592 */
Michael Haggerty0a4b24f2015-06-22 14:03:02[diff] [blame]2593static int commit_packed_refs(void)
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2594{
2595 struct packed_ref_cache *packed_ref_cache =
2596 get_packed_ref_cache(&ref_cache);
2597 int error = 0;
Ronnie Sahlbergd3f66552014-06-20 14:42:53[diff] [blame]2598 int save_errno = 0;
Jeff King9540ce52014-09-10 10:03:52[diff] [blame]2599 FILE *out;
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2600
2601 if (!packed_ref_cache->lock)
2602 die("internal error: packed-refs not locked");
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2603
Michael Haggerty6e578a32014-10-01 11:14:49[diff] [blame]2604 out = fdopen_lock_file(packed_ref_cache->lock, "w");
Jeff King9540ce52014-09-10 10:03:52[diff] [blame]2605 if (!out)
2606 die_errno("unable to fdopen packed-refs descriptor");
2607
2608 fprintf_or_die(out, "%s", PACKED_REFS_HEADER);
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2609 do_for_each_entry_in_dir(get_packed_ref_dir(packed_ref_cache),
Jeff King9540ce52014-09-10 10:03:52[diff] [blame]2610 0, write_packed_entry_fn, out);
Jeff King9540ce52014-09-10 10:03:52[diff] [blame]2611
Ronnie Sahlbergd3f66552014-06-20 14:42:53[diff] [blame]2612 if (commit_lock_file(packed_ref_cache->lock)) {
2613 save_errno = errno;
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2614 error = -1;
Ronnie Sahlbergd3f66552014-06-20 14:42:53[diff] [blame]2615 }
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2616 packed_ref_cache->lock = NULL;
Michael Haggerty4f6b83e2013-06-20 08:37:49[diff] [blame]2617 release_packed_ref_cache(packed_ref_cache);
Ronnie Sahlbergd3f66552014-06-20 14:42:53[diff] [blame]2618 errno = save_errno;
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2619 return error;
2620}
2621
Michael Haggerty0a4b24f2015-06-22 14:03:02[diff] [blame]2622/*
2623 * Rollback the lockfile for the packed-refs file, and discard the
2624 * in-memory packed reference cache. (The packed-refs file will be
2625 * read anew if it is needed again after this function is called.)
2626 */
2627static void rollback_packed_refs(void)
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2628{
2629 struct packed_ref_cache *packed_ref_cache =
2630 get_packed_ref_cache(&ref_cache);
2631
2632 if (!packed_ref_cache->lock)
2633 die("internal error: packed-refs not locked");
2634 rollback_lock_file(packed_ref_cache->lock);
2635 packed_ref_cache->lock = NULL;
Michael Haggerty4f6b83e2013-06-20 08:37:49[diff] [blame]2636 release_packed_ref_cache(packed_ref_cache);
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2637 clear_packed_ref_cache(&ref_cache);
2638}
2639
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2640struct ref_to_prune {
2641 struct ref_to_prune *next;
2642 unsigned char sha1[20];
2643 char name[FLEX_ARRAY];
2644};
2645
2646struct pack_refs_cb_data {
2647 unsigned int flags;
Michael Haggerty267f9a82013-06-20 08:37:44[diff] [blame]2648 struct ref_dir *packed_refs;
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2649 struct ref_to_prune *ref_to_prune;
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2650};
2651
Michael Haggerty267f9a82013-06-20 08:37:44[diff] [blame]2652/*
2653 * An each_ref_entry_fn that is run over loose references only. If
2654 * the loose reference can be packed, add an entry in the packed ref
2655 * cache. If the reference should be pruned, also add it to
2656 * ref_to_prune in the pack_refs_cb_data.
2657 */
2658static int pack_if_possible_fn(struct ref_entry *entry, void *cb_data)
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2659{
2660 struct pack_refs_cb_data *cb = cb_data;
Michael Haggertyf85354b2013-04-22 19:52:37[diff] [blame]2661 enum peel_status peel_status;
Michael Haggerty267f9a82013-06-20 08:37:44[diff] [blame]2662 struct ref_entry *packed_entry;
Christian Couder59556542013-11-30 20:55:40[diff] [blame]2663 int is_tag_ref = starts_with(entry->name, "refs/tags/");
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2664
Michael Haggerty267f9a82013-06-20 08:37:44[diff] [blame]2665 /* ALWAYS pack tags */
2666 if (!(cb->flags & PACK_REFS_ALL) && !is_tag_ref)
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2667 return 0;
2668
Michael Haggertyb2a82262013-04-22 19:52:39[diff] [blame]2669 /* Do not pack symbolic or broken refs: */
2670 if ((entry->flag & REF_ISSYMREF) || !ref_resolves_to_object(entry))
2671 return 0;
2672
Michael Haggerty267f9a82013-06-20 08:37:44[diff] [blame]2673 /* Add a packed ref cache entry equivalent to the loose entry. */
Michael Haggertyf85354b2013-04-22 19:52:37[diff] [blame]2674 peel_status = peel_entry(entry, 1);
Michael Haggerty0f299202013-04-22 19:52:38[diff] [blame]2675 if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG)
Michael Haggertyf85354b2013-04-22 19:52:37[diff] [blame]2676 die("internal error peeling reference %s (%s)",
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]2677 entry->name, oid_to_hex(&entry->u.value.oid));
Michael Haggerty267f9a82013-06-20 08:37:44[diff] [blame]2678 packed_entry = find_ref(cb->packed_refs, entry->name);
2679 if (packed_entry) {
2680 /* Overwrite existing packed entry with info from loose entry */
2681 packed_entry->flag = REF_ISPACKED | REF_KNOWS_PEELED;
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]2682 oidcpy(&packed_entry->u.value.oid, &entry->u.value.oid);
Michael Haggerty267f9a82013-06-20 08:37:44[diff] [blame]2683 } else {
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]2684 packed_entry = create_ref_entry(entry->name, entry->u.value.oid.hash,
Michael Haggerty267f9a82013-06-20 08:37:44[diff] [blame]2685 REF_ISPACKED | REF_KNOWS_PEELED, 0);
2686 add_ref(cb->packed_refs, packed_entry);
2687 }
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]2688 oidcpy(&packed_entry->u.value.peeled, &entry->u.value.peeled);
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2689
Michael Haggerty267f9a82013-06-20 08:37:44[diff] [blame]2690 /* Schedule the loose reference for pruning if requested. */
2691 if ((cb->flags & PACK_REFS_PRUNE)) {
Michael Haggerty12e77552013-04-22 19:52:35[diff] [blame]2692 int namelen = strlen(entry->name) + 1;
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2693 struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen);
brian m. carlson83538472015-05-25 18:38:27[diff] [blame]2694 hashcpy(n->sha1, entry->u.value.oid.hash);
Michael Haggerty12e77552013-04-22 19:52:35[diff] [blame]2695 strcpy(n->name, entry->name);
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2696 n->next = cb->ref_to_prune;
2697 cb->ref_to_prune = n;
2698 }
Michael Haggertyd66da472012-04-10 05:30:17[diff] [blame]2699 return 0;
2700}
2701
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2702/*
2703 * Remove empty parents, but spare refs/ and immediate subdirs.
2704 * Note: munges *name.
2705 */
2706static void try_remove_empty_parents(char *name)
2707{
2708 char *p, *q;
2709 int i;
2710 p = name;
2711 for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */
2712 while (*p && *p != '/')
2713 p++;
2714 /* tolerate duplicate slashes; see check_refname_format() */
2715 while (*p == '/')
2716 p++;
2717 }
2718 for (q = p; *q; q++)
2719 ;
2720 while (1) {
2721 while (q > p && *q != '/')
2722 q--;
2723 while (q > p && *(q-1) == '/')
2724 q--;
2725 if (q == p)
2726 break;
2727 *q = '\0';
2728 if (rmdir(git_path("%s", name)))
2729 break;
2730 }
2731}
2732
2733/* make sure nobody touched the ref, and unlink */
2734static void prune_ref(struct ref_to_prune *r)
2735{
Ronnie Sahlberg029cdb42014-04-30 16:03:36[diff] [blame]2736 struct ref_transaction *transaction;
2737 struct strbuf err = STRBUF_INIT;
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2738
Junio C Hamano88e7dff2014-09-11 17:33:33[diff] [blame]2739 if (check_refname_format(r->name, 0))
Ronnie Sahlbergcba12022014-04-29 22:45:52[diff] [blame]2740 return;
2741
Ronnie Sahlberg029cdb42014-04-30 16:03:36[diff] [blame]2742 transaction = ref_transaction_begin(&err);
2743 if (!transaction ||
2744 ref_transaction_delete(transaction, r->name, r->sha1,
Michael Haggertyfb5a6bb2015-02-17 17:00:16[diff] [blame]2745 REF_ISPRUNING, NULL, &err) ||
Ronnie Sahlbergdb7516a2014-04-30 19:22:42[diff] [blame]2746 ref_transaction_commit(transaction, &err)) {
Ronnie Sahlberg029cdb42014-04-30 16:03:36[diff] [blame]2747 ref_transaction_free(transaction);
2748 error("%s", err.buf);
2749 strbuf_release(&err);
2750 return;
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2751 }
Ronnie Sahlberg029cdb42014-04-30 16:03:36[diff] [blame]2752 ref_transaction_free(transaction);
2753 strbuf_release(&err);
2754 try_remove_empty_parents(r->name);
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2755}
2756
2757static void prune_refs(struct ref_to_prune *r)
2758{
2759 while (r) {
2760 prune_ref(r);
2761 r = r->next;
2762 }
2763}
2764
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2765int pack_refs(unsigned int flags)
2766{
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2767 struct pack_refs_cb_data cbdata;
2768
2769 memset(&cbdata, 0, sizeof(cbdata));
2770 cbdata.flags = flags;
2771
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2772 lock_packed_refs(LOCK_DIE_ON_ERROR);
Michael Haggerty267f9a82013-06-20 08:37:44[diff] [blame]2773 cbdata.packed_refs = get_packed_refs(&ref_cache);
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2774
Michael Haggerty267f9a82013-06-20 08:37:44[diff] [blame]2775 do_for_each_entry_in_dir(get_loose_refs(&ref_cache), 0,
2776 pack_if_possible_fn, &cbdata);
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2777
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2778 if (commit_packed_refs())
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2779 die_errno("unable to overwrite old ref-pack file");
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2780
Michael Haggerty32d462c2013-04-22 19:52:32[diff] [blame]2781 prune_refs(cbdata.ref_to_prune);
2782 return 0;
2783}
2784
Michael Haggerty79e4d8a2015-06-22 14:03:00[diff] [blame]2785/*
2786 * Rewrite the packed-refs file, omitting any refs listed in
2787 * 'refnames'. On error, leave packed-refs unchanged, write an error
2788 * message to 'err', and return a nonzero value.
2789 *
2790 * The refs in 'refnames' needn't be sorted. `err` must not be NULL.
2791 */
2792static int repack_without_refs(struct string_list *refnames, struct strbuf *err)
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]2793{
Michael Haggerty7618fd82013-04-22 19:52:17[diff] [blame]2794 struct ref_dir *packed;
Jeff Kingea56c4e2015-03-20 18:43:17[diff] [blame]2795 struct string_list_item *refname;
Michael Haggerty4a45b2f2014-11-25 08:02:32[diff] [blame]2796 int ret, needs_repacking = 0, removed = 0;
Michael Haggerty7618fd82013-04-22 19:52:17[diff] [blame]2797
Jonathan Nieder5a603b02014-08-28 23:42:37[diff] [blame]2798 assert(err);
2799
Brad King61cee0d2013-09-04 15:22:42[diff] [blame]2800 /* Look for a packed ref */
Michael Haggerty4a45b2f2014-11-25 08:02:32[diff] [blame]2801 for_each_string_list_item(refname, refnames) {
2802 if (get_packed_ref(refname->string)) {
2803 needs_repacking = 1;
Brad King61cee0d2013-09-04 15:22:42[diff] [blame]2804 break;
Michael Haggerty4a45b2f2014-11-25 08:02:32[diff] [blame]2805 }
2806 }
Brad King61cee0d2013-09-04 15:22:42[diff] [blame]2807
2808 /* Avoid locking if we have nothing to do */
Michael Haggerty4a45b2f2014-11-25 08:02:32[diff] [blame]2809 if (!needs_repacking)
Brad King61cee0d2013-09-04 15:22:42[diff] [blame]2810 return 0; /* no refname exists in packed refs */
Michael Haggerty7618fd82013-04-22 19:52:17[diff] [blame]2811
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2812 if (lock_packed_refs(0)) {
Jonathan Nieder5a603b02014-08-28 23:42:37[diff] [blame]2813 unable_to_lock_message(git_path("packed-refs"), errno, err);
2814 return -1;
Miklos Vajna1b018fd2009-09-26 23:15:09[diff] [blame]2815 }
Michael Haggerty9da31cb2013-04-22 19:52:41[diff] [blame]2816 packed = get_packed_refs(&ref_cache);
Michael Haggerty7b40d392013-06-20 08:37:43[diff] [blame]2817
Brad King61cee0d2013-09-04 15:22:42[diff] [blame]2818 /* Remove refnames from the cache */
Michael Haggerty4a45b2f2014-11-25 08:02:32[diff] [blame]2819 for_each_string_list_item(refname, refnames)
2820 if (remove_entry(packed, refname->string) != -1)
Brad King61cee0d2013-09-04 15:22:42[diff] [blame]2821 removed = 1;
2822 if (!removed) {
Michael Haggerty506a7602013-04-22 19:52:27[diff] [blame]2823 /*
Brad King61cee0d2013-09-04 15:22:42[diff] [blame]2824 * All packed entries disappeared while we were
Michael Haggerty506a7602013-04-22 19:52:27[diff] [blame]2825 * acquiring the lock.
2826 */
Michael Haggerty9f69d292013-06-20 08:37:46[diff] [blame]2827 rollback_packed_refs();
Michael Haggerty506a7602013-04-22 19:52:27[diff] [blame]2828 return 0;
2829 }
Michael Haggerty7b40d392013-06-20 08:37:43[diff] [blame]2830
Brad King61cee0d2013-09-04 15:22:42[diff] [blame]2831 /* Write what remains */
Ronnie Sahlberg60bca082014-06-20 14:42:49[diff] [blame]2832 ret = commit_packed_refs();
Jonathan Nieder5a603b02014-08-28 23:42:37[diff] [blame]2833 if (ret)
Ronnie Sahlberg60bca082014-06-20 14:42:49[diff] [blame]2834 strbuf_addf(err, "unable to overwrite old ref-pack file: %s",
2835 strerror(errno));
2836 return ret;
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]2837}
2838
Ronnie Sahlbergdbdcac72014-05-15 15:25:23[diff] [blame]2839static int delete_ref_loose(struct ref_lock *lock, int flag, struct strbuf *err)
Brad King2ddb5d12013-09-04 15:22:41[diff] [blame]2840{
Jonathan Nieder5a603b02014-08-28 23:42:37[diff] [blame]2841 assert(err);
2842
Brad King2ddb5d12013-09-04 15:22:41[diff] [blame]2843 if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
Michael Haggerty91f1f192014-10-01 10:28:16[diff] [blame]2844 /*
2845 * loose. The loose file name is the same as the
2846 * lockfile name, minus ".lock":
2847 */
Michael Haggertyec38b4e2014-10-01 10:28:39[diff] [blame]2848 char *loose_filename = get_locked_file_path(lock->lk);
Ronnie Sahlbergdbdcac72014-05-15 15:25:23[diff] [blame]2849 int res = unlink_or_msg(loose_filename, err);
Michael Haggerty91f1f192014-10-01 10:28:16[diff] [blame]2850 free(loose_filename);
Ronnie Sahlbergdbdcac72014-05-15 15:25:23[diff] [blame]2851 if (res)
Brad King2ddb5d12013-09-04 15:22:41[diff] [blame]2852 return 1;
2853 }
2854 return 0;
2855}
2856
David Turner266b1822015-07-31 06:06:18[diff] [blame]2857static int is_per_worktree_ref(const char *refname)
2858{
2859 return !strcmp(refname, "HEAD");
2860}
2861
2862static int is_pseudoref_syntax(const char *refname)
2863{
2864 const char *c;
2865
2866 for (c = refname; *c; c++) {
2867 if (!isupper(*c) && *c != '-' && *c != '_')
2868 return 0;
2869 }
2870
2871 return 1;
2872}
2873
2874enum ref_type ref_type(const char *refname)
2875{
2876 if (is_per_worktree_ref(refname))
2877 return REF_TYPE_PER_WORKTREE;
2878 if (is_pseudoref_syntax(refname))
2879 return REF_TYPE_PSEUDOREF;
2880 return REF_TYPE_NORMAL;
2881}
2882
David Turner74ec19d2015-07-31 06:06:19[diff] [blame]2883static int write_pseudoref(const char *pseudoref, const unsigned char *sha1,
2884 const unsigned char *old_sha1, struct strbuf *err)
2885{
2886 const char *filename;
2887 int fd;
2888 static struct lock_file lock;
2889 struct strbuf buf = STRBUF_INIT;
2890 int ret = -1;
2891
2892 strbuf_addf(&buf, "%s\n", sha1_to_hex(sha1));
2893
2894 filename = git_path("%s", pseudoref);
2895 fd = hold_lock_file_for_update(&lock, filename, LOCK_DIE_ON_ERROR);
2896 if (fd < 0) {
2897 strbuf_addf(err, "Could not open '%s' for writing: %s",
2898 filename, strerror(errno));
2899 return -1;
2900 }
2901
2902 if (old_sha1) {
2903 unsigned char actual_old_sha1[20];
David Turner2c3aed12015-07-15 22:05:28[diff] [blame]2904
2905 if (read_ref(pseudoref, actual_old_sha1))
2906 die("could not read ref '%s'", pseudoref);
David Turner74ec19d2015-07-31 06:06:19[diff] [blame]2907 if (hashcmp(actual_old_sha1, old_sha1)) {
2908 strbuf_addf(err, "Unexpected sha1 when writing %s", pseudoref);
2909 rollback_lock_file(&lock);
2910 goto done;
2911 }
2912 }
2913
2914 if (write_in_full(fd, buf.buf, buf.len) != buf.len) {
2915 strbuf_addf(err, "Could not write to '%s'", filename);
2916 rollback_lock_file(&lock);
2917 goto done;
2918 }
2919
2920 commit_lock_file(&lock);
2921 ret = 0;
2922done:
2923 strbuf_release(&buf);
2924 return ret;
2925}
2926
2927static int delete_pseudoref(const char *pseudoref, const unsigned char *old_sha1)
2928{
2929 static struct lock_file lock;
2930 const char *filename;
2931
2932 filename = git_path("%s", pseudoref);
2933
2934 if (old_sha1 && !is_null_sha1(old_sha1)) {
2935 int fd;
2936 unsigned char actual_old_sha1[20];
2937
2938 fd = hold_lock_file_for_update(&lock, filename,
2939 LOCK_DIE_ON_ERROR);
2940 if (fd < 0)
2941 die_errno(_("Could not open '%s' for writing"), filename);
David Turner2c3aed12015-07-15 22:05:28[diff] [blame]2942 if (read_ref(pseudoref, actual_old_sha1))
2943 die("could not read ref '%s'", pseudoref);
David Turner74ec19d2015-07-31 06:06:19[diff] [blame]2944 if (hashcmp(actual_old_sha1, old_sha1)) {
2945 warning("Unexpected sha1 when deleting %s", pseudoref);
2946 rollback_lock_file(&lock);
2947 return -1;
2948 }
2949
2950 unlink(filename);
2951 rollback_lock_file(&lock);
2952 } else {
2953 unlink(filename);
2954 }
2955
2956 return 0;
2957}
2958
Michael Haggertyfc1c2162015-06-22 14:02:52[diff] [blame]2959int delete_ref(const char *refname, const unsigned char *old_sha1,
2960 unsigned int flags)
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]2961{
Ronnie Sahlberg7521cc42014-04-30 16:22:45[diff] [blame]2962 struct ref_transaction *transaction;
2963 struct strbuf err = STRBUF_INIT;
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]2964
David Turner74ec19d2015-07-31 06:06:19[diff] [blame]2965 if (ref_type(refname) == REF_TYPE_PSEUDOREF)
Junio C Hamano080cc642015-08-25 21:57:08[diff] [blame]2966 return delete_pseudoref(refname, old_sha1);
David Turner74ec19d2015-07-31 06:06:19[diff] [blame]2967
Ronnie Sahlberg7521cc42014-04-30 16:22:45[diff] [blame]2968 transaction = ref_transaction_begin(&err);
2969 if (!transaction ||
Michael Haggertyfc67a082015-06-22 14:02:54[diff] [blame]2970 ref_transaction_delete(transaction, refname, old_sha1,
Michael Haggertyfb5a6bb2015-02-17 17:00:16[diff] [blame]2971 flags, NULL, &err) ||
Ronnie Sahlbergdb7516a2014-04-30 19:22:42[diff] [blame]2972 ref_transaction_commit(transaction, &err)) {
Ronnie Sahlberg7521cc42014-04-30 16:22:45[diff] [blame]2973 error("%s", err.buf);
2974 ref_transaction_free(transaction);
2975 strbuf_release(&err);
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]2976 return 1;
Ronnie Sahlberg7521cc42014-04-30 16:22:45[diff] [blame]2977 }
2978 ref_transaction_free(transaction);
2979 strbuf_release(&err);
2980 return 0;
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]2981}
2982
Michael Haggerty98ffd5f2015-06-22 14:02:55[diff] [blame]2983int delete_refs(struct string_list *refnames)
2984{
2985 struct strbuf err = STRBUF_INIT;
2986 int i, result = 0;
2987
Michael Haggerty7fa7dc82015-06-22 14:02:57[diff] [blame]2988 if (!refnames->nr)
2989 return 0;
2990
2991 result = repack_without_refs(refnames, &err);
2992 if (result) {
2993 /*
2994 * If we failed to rewrite the packed-refs file, then
2995 * it is unsafe to try to remove loose refs, because
2996 * doing so might expose an obsolete packed value for
2997 * a reference that might even point at an object that
2998 * has been garbage collected.
2999 */
3000 if (refnames->nr == 1)
3001 error(_("could not delete reference %s: %s"),
3002 refnames->items[0].string, err.buf);
3003 else
3004 error(_("could not delete references: %s"), err.buf);
3005
3006 goto out;
3007 }
Michael Haggerty98ffd5f2015-06-22 14:02:55[diff] [blame]3008
3009 for (i = 0; i < refnames->nr; i++) {
3010 const char *refname = refnames->items[i].string;
3011
3012 if (delete_ref(refname, NULL, 0))
Michael Haggerty5d978612015-06-22 14:02:56[diff] [blame]3013 result |= error(_("could not remove reference %s"), refname);
Michael Haggerty98ffd5f2015-06-22 14:02:55[diff] [blame]3014 }
3015
Michael Haggerty7fa7dc82015-06-22 14:02:57[diff] [blame]3016out:
3017 strbuf_release(&err);
Michael Haggerty98ffd5f2015-06-22 14:02:55[diff] [blame]3018 return result;
3019}
3020
Pierre Habouzit765c2252010-07-07 07:47:20[diff] [blame]3021/*
3022 * People using contrib's git-new-workdir have .git/logs/refs ->
3023 * /some/other/path/.git/logs/refs, and that may live on another device.
3024 *
3025 * IOW, to avoid cross device rename errors, the temporary renamed log must
3026 * live into logs/refs.
3027 */
3028#define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
3029
Michael Haggertyfa59ae72014-01-18 22:48:58[diff] [blame]3030static int rename_tmp_log(const char *newrefname)
3031{
Michael Haggertyf1e9e9a2014-01-18 22:49:00[diff] [blame]3032 int attempts_remaining = 4;
Jeff Kingd6549f32015-08-10 09:36:53[diff] [blame]3033 struct strbuf path = STRBUF_INIT;
3034 int ret = -1;
Michael Haggertyae4a2832014-01-18 22:48:59[diff] [blame]3035
3036 retry:
Jeff Kingd6549f32015-08-10 09:36:53[diff] [blame]3037 strbuf_reset(&path);
3038 strbuf_git_path(&path, "logs/%s", newrefname);
3039 switch (safe_create_leading_directories_const(path.buf)) {
Michael Haggerty08f555c2014-01-18 22:49:01[diff] [blame]3040 case SCLD_OK:
3041 break; /* success */
3042 case SCLD_VANISHED:
3043 if (--attempts_remaining > 0)
3044 goto retry;
3045 /* fall through */
3046 default:
Michael Haggertyfa59ae72014-01-18 22:48:58[diff] [blame]3047 error("unable to create directory for %s", newrefname);
Jeff Kingd6549f32015-08-10 09:36:53[diff] [blame]3048 goto out;
Michael Haggertyfa59ae72014-01-18 22:48:58[diff] [blame]3049 }
3050
Jeff Kingd6549f32015-08-10 09:36:53[diff] [blame]3051 if (rename(git_path(TMP_RENAMED_LOG), path.buf)) {
Michael Haggertyf1e9e9a2014-01-18 22:49:00[diff] [blame]3052 if ((errno==EISDIR || errno==ENOTDIR) && --attempts_remaining > 0) {
Michael Haggertyfa59ae72014-01-18 22:48:58[diff] [blame]3053 /*
3054 * rename(a, b) when b is an existing
3055 * directory ought to result in ISDIR, but
3056 * Solaris 5.8 gives ENOTDIR. Sheesh.
3057 */
Jeff King470e28d2015-08-10 09:37:27[diff] [blame]3058 if (remove_empty_directories(&path)) {
Michael Haggertyfa59ae72014-01-18 22:48:58[diff] [blame]3059 error("Directory not empty: logs/%s", newrefname);
Jeff Kingd6549f32015-08-10 09:36:53[diff] [blame]3060 goto out;
Michael Haggertyfa59ae72014-01-18 22:48:58[diff] [blame]3061 }
3062 goto retry;
Michael Haggertyae4a2832014-01-18 22:48:59[diff] [blame]3063 } else if (errno == ENOENT && --attempts_remaining > 0) {
3064 /*
3065 * Maybe another process just deleted one of
3066 * the directories in the path to newrefname.
3067 * Try again from the beginning.
3068 */
3069 goto retry;
Michael Haggertyfa59ae72014-01-18 22:48:58[diff] [blame]3070 } else {
3071 error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
3072 newrefname, strerror(errno));
Jeff Kingd6549f32015-08-10 09:36:53[diff] [blame]3073 goto out;
Michael Haggertyfa59ae72014-01-18 22:48:58[diff] [blame]3074 }
3075 }
Jeff Kingd6549f32015-08-10 09:36:53[diff] [blame]3076 ret = 0;
3077out:
3078 strbuf_release(&path);
3079 return ret;
Michael Haggertyfa59ae72014-01-18 22:48:58[diff] [blame]3080}
3081
Ronnie Sahlberg5fe7d822014-05-01 18:16:07[diff] [blame]3082static int rename_ref_available(const char *oldname, const char *newname)
3083{
3084 struct string_list skip = STRING_LIST_INIT_NODUP;
Michael Haggerty1146f172015-05-11 15:25:14[diff] [blame]3085 struct strbuf err = STRBUF_INIT;
Ronnie Sahlberg5fe7d822014-05-01 18:16:07[diff] [blame]3086 int ret;
3087
3088 string_list_insert(&skip, oldname);
Michael Haggerty5baf37d2015-05-11 15:25:13[diff] [blame]3089 ret = !verify_refname_available(newname, NULL, &skip,
Michael Haggerty1146f172015-05-11 15:25:14[diff] [blame]3090 get_packed_refs(&ref_cache), &err)
Michael Haggerty5baf37d2015-05-11 15:25:13[diff] [blame]3091 && !verify_refname_available(newname, NULL, &skip,
Michael Haggerty1146f172015-05-11 15:25:14[diff] [blame]3092 get_loose_refs(&ref_cache), &err);
3093 if (!ret)
3094 error("%s", err.buf);
3095
Ronnie Sahlberg5fe7d822014-05-01 18:16:07[diff] [blame]3096 string_list_clear(&skip, 0);
Michael Haggerty1146f172015-05-11 15:25:14[diff] [blame]3097 strbuf_release(&err);
Ronnie Sahlberg5fe7d822014-05-01 18:16:07[diff] [blame]3098 return ret;
3099}
3100
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3101static int write_ref_to_lockfile(struct ref_lock *lock,
3102 const unsigned char *sha1, struct strbuf *err);
Michael Haggertyba43b7f2015-05-09 15:20:39[diff] [blame]3103static int commit_ref_update(struct ref_lock *lock,
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3104 const unsigned char *sha1, const char *logmsg,
David Turner0f2a71d2015-07-21 21:04:54[diff] [blame]3105 int flags, struct strbuf *err);
Ronnie Sahlbergaae383d2014-04-28 22:36:58[diff] [blame]3106
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]3107int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg)
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3108{
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3109 unsigned char sha1[20], orig_sha1[20];
3110 int flag = 0, logmoved = 0;
3111 struct ref_lock *lock;
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3112 struct stat loginfo;
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]3113 int log = !lstat(git_path("logs/%s", oldrefname), &loginfo);
Miklos Vajnaeca35a22008-10-26 02:33:56[diff] [blame]3114 const char *symref = NULL;
Michael Haggerty4a32b2e2015-05-11 15:25:15[diff] [blame]3115 struct strbuf err = STRBUF_INIT;
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3116
Miklos Vajna450d4c02008-10-26 02:33:57[diff] [blame]3117 if (log && S_ISLNK(loginfo.st_mode))
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]3118 return error("reflog for %s is a symlink", oldrefname);
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3119
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]3120 symref = resolve_ref_unsafe(oldrefname, RESOLVE_REF_READING,
3121 orig_sha1, &flag);
Miklos Vajnaeca35a22008-10-26 02:33:56[diff] [blame]3122 if (flag & REF_ISSYMREF)
Miklos Vajnafa58186c2008-10-29 00:05:27[diff] [blame]3123 return error("refname %s is a symbolic ref, renaming it is not supported",
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]3124 oldrefname);
Miklos Vajnaeca35a22008-10-26 02:33:56[diff] [blame]3125 if (!symref)
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]3126 return error("refname %s not found", oldrefname);
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3127
Ronnie Sahlberg5fe7d822014-05-01 18:16:07[diff] [blame]3128 if (!rename_ref_available(oldrefname, newrefname))
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3129 return 1;
3130
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]3131 if (log && rename(git_path("logs/%s", oldrefname), git_path(TMP_RENAMED_LOG)))
Pierre Habouzit765c2252010-07-07 07:47:20[diff] [blame]3132 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]3133 oldrefname, strerror(errno));
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3134
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]3135 if (delete_ref(oldrefname, orig_sha1, REF_NODEREF)) {
3136 error("unable to delete old %s", oldrefname);
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3137 goto rollback;
3138 }
3139
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]3140 if (!read_ref_full(newrefname, RESOLVE_REF_READING, sha1, NULL) &&
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]3141 delete_ref(newrefname, sha1, REF_NODEREF)) {
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3142 if (errno==EISDIR) {
Jeff King470e28d2015-08-10 09:37:27[diff] [blame]3143 struct strbuf path = STRBUF_INIT;
3144 int result;
3145
3146 strbuf_git_path(&path, "%s", newrefname);
3147 result = remove_empty_directories(&path);
3148 strbuf_release(&path);
3149
3150 if (result) {
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]3151 error("Directory not empty: %s", newrefname);
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3152 goto rollback;
3153 }
3154 } else {
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]3155 error("unable to delete existing %s", newrefname);
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3156 goto rollback;
3157 }
3158 }
3159
Michael Haggertyfa59ae72014-01-18 22:48:58[diff] [blame]3160 if (log && rename_tmp_log(newrefname))
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3161 goto rollback;
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3162
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3163 logmoved = log;
3164
Michael Haggerty4a32b2e2015-05-11 15:25:15[diff] [blame]3165 lock = lock_ref_sha1_basic(newrefname, NULL, NULL, NULL, 0, NULL, &err);
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3166 if (!lock) {
Michael Haggertyabeef9c2015-05-11 15:25:17[diff] [blame]3167 error("unable to rename '%s' to '%s': %s", oldrefname, newrefname, err.buf);
Michael Haggerty4a32b2e2015-05-11 15:25:15[diff] [blame]3168 strbuf_release(&err);
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3169 goto rollback;
3170 }
Michael Haggerty5cb901a2015-05-25 18:39:22[diff] [blame]3171 hashcpy(lock->old_oid.hash, orig_sha1);
Michael Haggertyba43b7f2015-05-09 15:20:39[diff] [blame]3172
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3173 if (write_ref_to_lockfile(lock, orig_sha1, &err) ||
David Turner0f2a71d2015-07-21 21:04:54[diff] [blame]3174 commit_ref_update(lock, orig_sha1, logmsg, 0, &err)) {
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3175 error("unable to write current sha1 into %s: %s", newrefname, err.buf);
3176 strbuf_release(&err);
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3177 goto rollback;
3178 }
3179
3180 return 0;
3181
3182 rollback:
Michael Haggerty4a32b2e2015-05-11 15:25:15[diff] [blame]3183 lock = lock_ref_sha1_basic(oldrefname, NULL, NULL, NULL, 0, NULL, &err);
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3184 if (!lock) {
Michael Haggertyabeef9c2015-05-11 15:25:17[diff] [blame]3185 error("unable to lock %s for rollback: %s", oldrefname, err.buf);
Michael Haggerty4a32b2e2015-05-11 15:25:15[diff] [blame]3186 strbuf_release(&err);
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3187 goto rollbacklog;
3188 }
3189
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3190 flag = log_all_ref_updates;
3191 log_all_ref_updates = 0;
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3192 if (write_ref_to_lockfile(lock, orig_sha1, &err) ||
David Turner0f2a71d2015-07-21 21:04:54[diff] [blame]3193 commit_ref_update(lock, orig_sha1, NULL, 0, &err)) {
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3194 error("unable to write current sha1 into %s: %s", oldrefname, err.buf);
3195 strbuf_release(&err);
3196 }
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3197 log_all_ref_updates = flag;
3198
3199 rollbacklog:
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]3200 if (logmoved && rename(git_path("logs/%s", newrefname), git_path("logs/%s", oldrefname)))
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3201 error("unable to restore logfile %s from %s: %s",
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]3202 oldrefname, newrefname, strerror(errno));
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3203 if (!logmoved && log &&
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]3204 rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldrefname)))
Pierre Habouzit765c2252010-07-07 07:47:20[diff] [blame]3205 error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s",
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]3206 oldrefname, strerror(errno));
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]3207
3208 return 1;
3209}
3210
Ronnie Sahlberg0b1e6542014-12-12 08:57:00[diff] [blame]3211static int close_ref(struct ref_lock *lock)
Brandon Caseyb5313942008-01-16 19:14:30[diff] [blame]3212{
3213 if (close_lock_file(lock->lk))
3214 return -1;
Brandon Caseyb5313942008-01-16 19:14:30[diff] [blame]3215 return 0;
3216}
3217
Ronnie Sahlberg0b1e6542014-12-12 08:57:00[diff] [blame]3218static int commit_ref(struct ref_lock *lock)
Brandon Caseyb5313942008-01-16 19:14:30[diff] [blame]3219{
3220 if (commit_lock_file(lock->lk))
3221 return -1;
Brandon Caseyb5313942008-01-16 19:14:30[diff] [blame]3222 return 0;
3223}
3224
Junio C Hamano0ec29a42007-07-29 00:17:17[diff] [blame]3225/*
3226 * copy the reflog message msg to buf, which has been allocated sufficiently
3227 * large, while cleaning up the whitespaces. Especially, convert LF to space,
3228 * because reflog file is one line per entry.
3229 */
3230static int copy_msg(char *buf, const char *msg)
3231{
3232 char *cp = buf;
3233 char c;
3234 int wasspace = 1;
3235
3236 *cp++ = '\t';
3237 while ((c = *msg++)) {
3238 if (wasspace && isspace(c))
3239 continue;
3240 wasspace = isspace(c);
3241 if (wasspace)
3242 c = ' ';
3243 *cp++ = c;
3244 }
3245 while (buf < cp && isspace(cp[-1]))
3246 cp--;
3247 *cp++ = '\n';
3248 return cp - buf;
3249}
3250
David Turner4e2bef52015-07-21 21:04:51[diff] [blame]3251static int should_autocreate_reflog(const char *refname)
3252{
3253 if (!log_all_ref_updates)
3254 return 0;
3255 return starts_with(refname, "refs/heads/") ||
3256 starts_with(refname, "refs/remotes/") ||
3257 starts_with(refname, "refs/notes/") ||
3258 !strcmp(refname, "HEAD");
3259}
3260
David Turnerabd0cd32015-07-21 21:04:52[diff] [blame]3261/*
3262 * Create a reflog for a ref. If force_create = 0, the reflog will
3263 * only be created for certain refs (those for which
3264 * should_autocreate_reflog returns non-zero. Otherwise, create it
3265 * regardless of the ref name. Fill in *err and return -1 on failure.
3266 */
Jeff King54b418f2015-08-10 12:26:38[diff] [blame]3267static int log_ref_setup(const char *refname, struct strbuf *logfile, struct strbuf *err, int force_create)
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]3268{
3269 int logfd, oflags = O_APPEND | O_WRONLY;
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]3270
Jeff King54b418f2015-08-10 12:26:38[diff] [blame]3271 strbuf_git_path(logfile, "logs/%s", refname);
David Turnerabd0cd32015-07-21 21:04:52[diff] [blame]3272 if (force_create || should_autocreate_reflog(refname)) {
Jeff King54b418f2015-08-10 12:26:38[diff] [blame]3273 if (safe_create_leading_directories(logfile->buf) < 0) {
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3274 strbuf_addf(err, "unable to create directory for %s: "
Jeff King54b418f2015-08-10 12:26:38[diff] [blame]3275 "%s", logfile->buf, strerror(errno));
Ronnie Sahlbergbd3b02d2014-06-20 14:42:50[diff] [blame]3276 return -1;
3277 }
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]3278 oflags |= O_CREAT;
3279 }
3280
Jeff King54b418f2015-08-10 12:26:38[diff] [blame]3281 logfd = open(logfile->buf, oflags, 0666);
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]3282 if (logfd < 0) {
Jeff King92338872014-11-04 13:24:53[diff] [blame]3283 if (!(oflags & O_CREAT) && (errno == ENOENT || errno == EISDIR))
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]3284 return 0;
3285
Jeff King92338872014-11-04 13:24:53[diff] [blame]3286 if (errno == EISDIR) {
Thomas Rast157aaea2010-06-10 12:54:03[diff] [blame]3287 if (remove_empty_directories(logfile)) {
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3288 strbuf_addf(err, "There are still logs under "
Jeff King54b418f2015-08-10 12:26:38[diff] [blame]3289 "'%s'", logfile->buf);
Ronnie Sahlbergbd3b02d2014-06-20 14:42:50[diff] [blame]3290 return -1;
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]3291 }
Jeff King54b418f2015-08-10 12:26:38[diff] [blame]3292 logfd = open(logfile->buf, oflags, 0666);
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]3293 }
3294
Ronnie Sahlbergbd3b02d2014-06-20 14:42:50[diff] [blame]3295 if (logfd < 0) {
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3296 strbuf_addf(err, "unable to append to %s: %s",
Jeff King54b418f2015-08-10 12:26:38[diff] [blame]3297 logfile->buf, strerror(errno));
Ronnie Sahlbergbd3b02d2014-06-20 14:42:50[diff] [blame]3298 return -1;
3299 }
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]3300 }
3301
Jeff King54b418f2015-08-10 12:26:38[diff] [blame]3302 adjust_shared_perm(logfile->buf);
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]3303 close(logfd);
3304 return 0;
3305}
3306
David Turnerabd0cd32015-07-21 21:04:52[diff] [blame]3307
3308int safe_create_reflog(const char *refname, int force_create, struct strbuf *err)
3309{
3310 int ret;
3311 struct strbuf sb = STRBUF_INIT;
3312
3313 ret = log_ref_setup(refname, &sb, err, force_create);
3314 strbuf_release(&sb);
3315 return ret;
3316}
3317
Ronnie Sahlberg2c6207a2014-12-12 08:56:42[diff] [blame]3318static int log_ref_write_fd(int fd, const unsigned char *old_sha1,
3319 const unsigned char *new_sha1,
3320 const char *committer, const char *msg)
3321{
3322 int msglen, written;
3323 unsigned maxlen, len;
3324 char *logrec;
3325
3326 msglen = msg ? strlen(msg) : 0;
3327 maxlen = strlen(committer) + msglen + 100;
3328 logrec = xmalloc(maxlen);
3329 len = sprintf(logrec, "%s %s %s\n",
3330 sha1_to_hex(old_sha1),
3331 sha1_to_hex(new_sha1),
3332 committer);
3333 if (msglen)
3334 len += copy_msg(logrec + len - 1, msg) - 1;
3335
3336 written = len <= maxlen ? write_in_full(fd, logrec, len) : -1;
3337 free(logrec);
3338 if (written != len)
3339 return -1;
3340
3341 return 0;
3342}
3343
Nguyễn Thái Ngọc Duy1a83c242014-11-30 08:24:28[diff] [blame]3344static int log_ref_write_1(const char *refname, const unsigned char *old_sha1,
3345 const unsigned char *new_sha1, const char *msg,
Jeff King54b418f2015-08-10 12:26:38[diff] [blame]3346 struct strbuf *logfile, int flags,
David Turner0f2a71d2015-07-21 21:04:54[diff] [blame]3347 struct strbuf *err)
Shawn Pearce6de08ae2006-05-17 09:55:40[diff] [blame]3348{
Ronnie Sahlberg2c6207a2014-12-12 08:56:42[diff] [blame]3349 int logfd, result, oflags = O_APPEND | O_WRONLY;
Shawn Pearce6de08ae2006-05-17 09:55:40[diff] [blame]3350
Junio C Hamano510c5a82007-01-07 09:35:34[diff] [blame]3351 if (log_all_ref_updates < 0)
Junio C Hamano7d1864c2007-01-07 10:00:28[diff] [blame]3352 log_all_ref_updates = !is_bare_repository();
Junio C Hamano510c5a82007-01-07 09:35:34[diff] [blame]3353
Jeff King54b418f2015-08-10 12:26:38[diff] [blame]3354 result = log_ref_setup(refname, logfile, err, flags & REF_FORCE_CREATE_REFLOG);
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3355
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]3356 if (result)
3357 return result;
Nicolas Pitre9a13f0b2007-01-26 22:26:05[diff] [blame]3358
Jeff King54b418f2015-08-10 12:26:38[diff] [blame]3359 logfd = open(logfile->buf, oflags);
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]3360 if (logfd < 0)
3361 return 0;
Ronnie Sahlberg2c6207a2014-12-12 08:56:42[diff] [blame]3362 result = log_ref_write_fd(logfd, old_sha1, new_sha1,
3363 git_committer_info(0), msg);
3364 if (result) {
Jeff King54b418f2015-08-10 12:26:38[diff] [blame]3365 strbuf_addf(err, "unable to append to %s: %s", logfile->buf,
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3366 strerror(errno));
Ronnie Sahlbergdc615de2014-06-20 14:42:55[diff] [blame]3367 close(logfd);
Ronnie Sahlbergdc615de2014-06-20 14:42:55[diff] [blame]3368 return -1;
3369 }
3370 if (close(logfd)) {
Jeff King54b418f2015-08-10 12:26:38[diff] [blame]3371 strbuf_addf(err, "unable to append to %s: %s", logfile->buf,
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3372 strerror(errno));
Ronnie Sahlbergdc615de2014-06-20 14:42:55[diff] [blame]3373 return -1;
3374 }
Shawn Pearce6de08ae2006-05-17 09:55:40[diff] [blame]3375 return 0;
3376}
3377
Nguyễn Thái Ngọc Duy1a83c242014-11-30 08:24:28[diff] [blame]3378static int log_ref_write(const char *refname, const unsigned char *old_sha1,
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3379 const unsigned char *new_sha1, const char *msg,
David Turner0f2a71d2015-07-21 21:04:54[diff] [blame]3380 int flags, struct strbuf *err)
Nguyễn Thái Ngọc Duy1a83c242014-11-30 08:24:28[diff] [blame]3381{
3382 struct strbuf sb = STRBUF_INIT;
David Turner0f2a71d2015-07-21 21:04:54[diff] [blame]3383 int ret = log_ref_write_1(refname, old_sha1, new_sha1, msg, &sb, flags,
3384 err);
Nguyễn Thái Ngọc Duy1a83c242014-11-30 08:24:28[diff] [blame]3385 strbuf_release(&sb);
3386 return ret;
3387}
3388
Ronnie Sahlberge7e0f262014-07-15 23:02:38[diff] [blame]3389int is_branch(const char *refname)
Linus Torvaldsc3b0dec2008-01-15 23:50:17[diff] [blame]3390{
Christian Couder59556542013-11-30 20:55:40[diff] [blame]3391 return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/");
Linus Torvaldsc3b0dec2008-01-15 23:50:17[diff] [blame]3392}
3393
Ronnie Sahlbergaae383d2014-04-28 22:36:58[diff] [blame]3394/*
Michael Haggertye6fd3c62015-04-24 11:35:45[diff] [blame]3395 * Write sha1 into the open lockfile, then close the lockfile. On
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3396 * errors, rollback the lockfile, fill in *err and
3397 * return -1.
Ronnie Sahlbergaae383d2014-04-28 22:36:58[diff] [blame]3398 */
Michael Haggertye6fd3c62015-04-24 11:35:45[diff] [blame]3399static int write_ref_to_lockfile(struct ref_lock *lock,
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3400 const unsigned char *sha1, struct strbuf *err)
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]3401{
3402 static char term = '\n';
Linus Torvaldsc3b0dec2008-01-15 23:50:17[diff] [blame]3403 struct object *o;
Michael Haggertyc99a4c22015-08-10 09:47:38[diff] [blame]3404 int fd;
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]3405
Linus Torvaldsc3b0dec2008-01-15 23:50:17[diff] [blame]3406 o = parse_object(sha1);
3407 if (!o) {
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3408 strbuf_addf(err,
3409 "Trying to write ref %s with nonexistent object %s",
3410 lock->ref_name, sha1_to_hex(sha1));
Linus Torvaldsc3b0dec2008-01-15 23:50:17[diff] [blame]3411 unlock_ref(lock);
Linus Torvaldsc3b0dec2008-01-15 23:50:17[diff] [blame]3412 return -1;
3413 }
3414 if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3415 strbuf_addf(err,
3416 "Trying to write non-commit object %s to branch %s",
3417 sha1_to_hex(sha1), lock->ref_name);
Linus Torvaldsc3b0dec2008-01-15 23:50:17[diff] [blame]3418 unlock_ref(lock);
Linus Torvaldsc3b0dec2008-01-15 23:50:17[diff] [blame]3419 return -1;
3420 }
Michael Haggertyc99a4c22015-08-10 09:47:38[diff] [blame]3421 fd = get_lock_file_fd(lock->lk);
3422 if (write_in_full(fd, sha1_to_hex(sha1), 40) != 40 ||
3423 write_in_full(fd, &term, 1) != 1 ||
Ronnie Sahlbergdc615de2014-06-20 14:42:55[diff] [blame]3424 close_ref(lock) < 0) {
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3425 strbuf_addf(err,
Junio C Hamanodb86e612015-08-25 21:57:09[diff] [blame]3426 "Couldn't write %s", get_lock_file_path(lock->lk));
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]3427 unlock_ref(lock);
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]3428 return -1;
3429 }
Michael Haggertye6fd3c62015-04-24 11:35:45[diff] [blame]3430 return 0;
3431}
3432
3433/*
Michael Haggertyad4cd6c2015-05-09 15:18:36[diff] [blame]3434 * Commit a change to a loose reference that has already been written
3435 * to the loose reference lockfile. Also update the reflogs if
3436 * necessary, using the specified lockmsg (which can be NULL).
Michael Haggertye6fd3c62015-04-24 11:35:45[diff] [blame]3437 */
Michael Haggertyad4cd6c2015-05-09 15:18:36[diff] [blame]3438static int commit_ref_update(struct ref_lock *lock,
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3439 const unsigned char *sha1, const char *logmsg,
David Turner0f2a71d2015-07-21 21:04:54[diff] [blame]3440 int flags, struct strbuf *err)
Michael Haggertye6fd3c62015-04-24 11:35:45[diff] [blame]3441{
Michael Haggerty9da31cb2013-04-22 19:52:41[diff] [blame]3442 clear_loose_ref_cache(&ref_cache);
David Turner0f2a71d2015-07-21 21:04:54[diff] [blame]3443 if (log_ref_write(lock->ref_name, lock->old_oid.hash, sha1, logmsg, flags, err) < 0 ||
Nicolas Pitrebd104db2007-01-26 22:26:07[diff] [blame]3444 (strcmp(lock->ref_name, lock->orig_ref_name) &&
David Turner0f2a71d2015-07-21 21:04:54[diff] [blame]3445 log_ref_write(lock->orig_ref_name, lock->old_oid.hash, sha1, logmsg, flags, err) < 0)) {
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3446 char *old_msg = strbuf_detach(err, NULL);
3447 strbuf_addf(err, "Cannot update the ref '%s': %s",
3448 lock->ref_name, old_msg);
3449 free(old_msg);
Shawn Pearce6de08ae2006-05-17 09:55:40[diff] [blame]3450 unlock_ref(lock);
3451 return -1;
3452 }
Nicolas Pitre605fac82007-03-21 21:11:44[diff] [blame]3453 if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
3454 /*
3455 * Special hack: If a branch is updated directly and HEAD
3456 * points to it (may happen on the remote side of a push
3457 * for example) then logically the HEAD reflog should be
3458 * updated too.
3459 * A generic solution implies reverse symref information,
3460 * but finding all symrefs pointing to the given branch
3461 * would be rather costly for this rare event (the direct
3462 * update of a branch) to be worth it. So let's cheat and
3463 * check with HEAD only which should cover 99% of all usage
3464 * scenarios (even 100% of the default ones).
3465 */
3466 unsigned char head_sha1[20];
3467 int head_flag;
3468 const char *head_ref;
Ronnie Sahlberg7695d112014-07-15 19:59:36[diff] [blame]3469 head_ref = resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
3470 head_sha1, &head_flag);
Nicolas Pitre605fac82007-03-21 21:11:44[diff] [blame]3471 if (head_ref && (head_flag & REF_ISSYMREF) &&
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3472 !strcmp(head_ref, lock->ref_name)) {
3473 struct strbuf log_err = STRBUF_INIT;
3474 if (log_ref_write("HEAD", lock->old_oid.hash, sha1,
David Turner0f2a71d2015-07-21 21:04:54[diff] [blame]3475 logmsg, 0, &log_err)) {
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3476 error("%s", log_err.buf);
3477 strbuf_release(&log_err);
3478 }
3479 }
Nicolas Pitre605fac82007-03-21 21:11:44[diff] [blame]3480 }
Brandon Caseyb5313942008-01-16 19:14:30[diff] [blame]3481 if (commit_ref(lock)) {
Linus Torvalds434cd0c2006-09-14 17:14:47[diff] [blame]3482 error("Couldn't set %s", lock->ref_name);
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]3483 unlock_ref(lock);
3484 return -1;
3485 }
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3486
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]3487 unlock_ref(lock);
3488 return 0;
Daniel Barkalow95fc7512005-06-06 20:31:29[diff] [blame]3489}
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]3490
Nicolas Pitre8b5157e2007-01-26 22:26:10[diff] [blame]3491int create_symref(const char *ref_target, const char *refs_heads_master,
3492 const char *logmsg)
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]3493{
Jeff Kinge3cf2302015-08-10 09:35:38[diff] [blame]3494 char *lockpath = NULL;
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]3495 char ref[1000];
3496 int fd, len, written;
Alex Riesena4f34cb2008-10-27 10:22:09[diff] [blame]3497 char *git_HEAD = git_pathdup("%s", ref_target);
Nicolas Pitre8b5157e2007-01-26 22:26:10[diff] [blame]3498 unsigned char old_sha1[20], new_sha1[20];
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3499 struct strbuf err = STRBUF_INIT;
Nicolas Pitre8b5157e2007-01-26 22:26:10[diff] [blame]3500
3501 if (logmsg && read_ref(ref_target, old_sha1))
3502 hashclr(old_sha1);
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]3503
Junio C Hamanod48744d2007-02-08 07:41:43[diff] [blame]3504 if (safe_create_leading_directories(git_HEAD) < 0)
3505 return error("unable to create directory for %s", git_HEAD);
3506
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]3507#ifndef NO_SYMLINK_HEAD
3508 if (prefer_symlink_refs) {
3509 unlink(git_HEAD);
3510 if (!symlink(refs_heads_master, git_HEAD))
Nicolas Pitre8b5157e2007-01-26 22:26:10[diff] [blame]3511 goto done;
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]3512 fprintf(stderr, "no symlink - falling back to symbolic ref\n");
3513 }
3514#endif
3515
3516 len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
3517 if (sizeof(ref) <= len) {
3518 error("refname too long: %s", refs_heads_master);
Junio C Hamano47fc52e2007-01-27 01:49:00[diff] [blame]3519 goto error_free_return;
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]3520 }
Jeff Kinge3cf2302015-08-10 09:35:38[diff] [blame]3521 lockpath = mkpathdup("%s.lock", git_HEAD);
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]3522 fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
3523 if (fd < 0) {
3524 error("Unable to open %s for writing", lockpath);
Junio C Hamano47fc52e2007-01-27 01:49:00[diff] [blame]3525 goto error_free_return;
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]3526 }
3527 written = write_in_full(fd, ref, len);
Jim Meyering91c8d592007-06-24 19:20:41[diff] [blame]3528 if (close(fd) != 0 || written != len) {
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]3529 error("Unable to write to %s", lockpath);
Junio C Hamano47fc52e2007-01-27 01:49:00[diff] [blame]3530 goto error_unlink_return;
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]3531 }
3532 if (rename(lockpath, git_HEAD) < 0) {
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]3533 error("Unable to create %s", git_HEAD);
Junio C Hamano47fc52e2007-01-27 01:49:00[diff] [blame]3534 goto error_unlink_return;
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]3535 }
3536 if (adjust_shared_perm(git_HEAD)) {
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]3537 error("Unable to fix permissions on %s", lockpath);
Junio C Hamano47fc52e2007-01-27 01:49:00[diff] [blame]3538 error_unlink_return:
Alex Riesen691f1a22009-04-29 21:22:56[diff] [blame]3539 unlink_or_warn(lockpath);
Junio C Hamano47fc52e2007-01-27 01:49:00[diff] [blame]3540 error_free_return:
Jeff Kinge3cf2302015-08-10 09:35:38[diff] [blame]3541 free(lockpath);
Junio C Hamano47fc52e2007-01-27 01:49:00[diff] [blame]3542 free(git_HEAD);
3543 return -1;
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]3544 }
Jeff Kinge3cf2302015-08-10 09:35:38[diff] [blame]3545 free(lockpath);
Nicolas Pitre8b5157e2007-01-26 22:26:10[diff] [blame]3546
Ramsay Jonesee96d112007-03-03 18:28:46[diff] [blame]3547#ifndef NO_SYMLINK_HEAD
Nicolas Pitre8b5157e2007-01-26 22:26:10[diff] [blame]3548 done:
Ramsay Jonesee96d112007-03-03 18:28:46[diff] [blame]3549#endif
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3550 if (logmsg && !read_ref(refs_heads_master, new_sha1) &&
David Turner0f2a71d2015-07-21 21:04:54[diff] [blame]3551 log_ref_write(ref_target, old_sha1, new_sha1, logmsg, 0, &err)) {
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]3552 error("%s", err.buf);
3553 strbuf_release(&err);
3554 }
Nicolas Pitre8b5157e2007-01-26 22:26:10[diff] [blame]3555
Junio C Hamano47fc52e2007-01-27 01:49:00[diff] [blame]3556 free(git_HEAD);
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]3557 return 0;
3558}
3559
Ronnie Sahlberg4207ed22014-06-03 16:09:59[diff] [blame]3560struct read_ref_at_cb {
3561 const char *refname;
3562 unsigned long at_time;
3563 int cnt;
3564 int reccnt;
3565 unsigned char *sha1;
3566 int found_it;
3567
3568 unsigned char osha1[20];
3569 unsigned char nsha1[20];
3570 int tz;
3571 unsigned long date;
3572 char **msg;
3573 unsigned long *cutoff_time;
3574 int *cutoff_tz;
3575 int *cutoff_cnt;
3576};
3577
3578static int read_ref_at_ent(unsigned char *osha1, unsigned char *nsha1,
3579 const char *email, unsigned long timestamp, int tz,
3580 const char *message, void *cb_data)
Junio C Hamano16d7cc92007-01-19 09:19:05[diff] [blame]3581{
Ronnie Sahlberg4207ed22014-06-03 16:09:59[diff] [blame]3582 struct read_ref_at_cb *cb = cb_data;
3583
3584 cb->reccnt++;
3585 cb->tz = tz;
3586 cb->date = timestamp;
3587
3588 if (timestamp <= cb->at_time || cb->cnt == 0) {
3589 if (cb->msg)
3590 *cb->msg = xstrdup(message);
3591 if (cb->cutoff_time)
3592 *cb->cutoff_time = timestamp;
3593 if (cb->cutoff_tz)
3594 *cb->cutoff_tz = tz;
3595 if (cb->cutoff_cnt)
3596 *cb->cutoff_cnt = cb->reccnt - 1;
3597 /*
3598 * we have not yet updated cb->[n|o]sha1 so they still
3599 * hold the values for the previous record.
3600 */
3601 if (!is_null_sha1(cb->osha1)) {
3602 hashcpy(cb->sha1, nsha1);
3603 if (hashcmp(cb->osha1, nsha1))
3604 warning("Log for ref %s has gap after %s.",
Jeff Kinga5481a62015-06-25 16:55:02[diff] [blame]3605 cb->refname, show_date(cb->date, cb->tz, DATE_MODE(RFC2822)));
Ronnie Sahlberg4207ed22014-06-03 16:09:59[diff] [blame]3606 }
3607 else if (cb->date == cb->at_time)
3608 hashcpy(cb->sha1, nsha1);
3609 else if (hashcmp(nsha1, cb->sha1))
3610 warning("Log for ref %s unexpectedly ended on %s.",
3611 cb->refname, show_date(cb->date, cb->tz,
Jeff Kinga5481a62015-06-25 16:55:02[diff] [blame]3612 DATE_MODE(RFC2822)));
Ronnie Sahlberg4207ed22014-06-03 16:09:59[diff] [blame]3613 hashcpy(cb->osha1, osha1);
3614 hashcpy(cb->nsha1, nsha1);
3615 cb->found_it = 1;
3616 return 1;
3617 }
3618 hashcpy(cb->osha1, osha1);
3619 hashcpy(cb->nsha1, nsha1);
3620 if (cb->cnt > 0)
3621 cb->cnt--;
3622 return 0;
3623}
3624
3625static int read_ref_at_ent_oldest(unsigned char *osha1, unsigned char *nsha1,
3626 const char *email, unsigned long timestamp,
3627 int tz, const char *message, void *cb_data)
3628{
3629 struct read_ref_at_cb *cb = cb_data;
3630
3631 if (cb->msg)
3632 *cb->msg = xstrdup(message);
3633 if (cb->cutoff_time)
3634 *cb->cutoff_time = timestamp;
3635 if (cb->cutoff_tz)
3636 *cb->cutoff_tz = tz;
3637 if (cb->cutoff_cnt)
3638 *cb->cutoff_cnt = cb->reccnt;
3639 hashcpy(cb->sha1, osha1);
3640 if (is_null_sha1(cb->sha1))
3641 hashcpy(cb->sha1, nsha1);
3642 /* We just want the first entry */
3643 return 1;
Junio C Hamano16d7cc92007-01-19 09:19:05[diff] [blame]3644}
3645
David Aguilarc41a87d2014-09-19 03:45:37[diff] [blame]3646int read_ref_at(const char *refname, unsigned int flags, unsigned long at_time, int cnt,
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]3647 unsigned char *sha1, char **msg,
3648 unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]3649{
Ronnie Sahlberg4207ed22014-06-03 16:09:59[diff] [blame]3650 struct read_ref_at_cb cb;
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]3651
Ronnie Sahlberg4207ed22014-06-03 16:09:59[diff] [blame]3652 memset(&cb, 0, sizeof(cb));
3653 cb.refname = refname;
3654 cb.at_time = at_time;
3655 cb.cnt = cnt;
3656 cb.msg = msg;
3657 cb.cutoff_time = cutoff_time;
3658 cb.cutoff_tz = cutoff_tz;
3659 cb.cutoff_cnt = cutoff_cnt;
3660 cb.sha1 = sha1;
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]3661
Ronnie Sahlberg4207ed22014-06-03 16:09:59[diff] [blame]3662 for_each_reflog_ent_reverse(refname, read_ref_at_ent, &cb);
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]3663
David Aguilarc41a87d2014-09-19 03:45:37[diff] [blame]3664 if (!cb.reccnt) {
3665 if (flags & GET_SHA1_QUIETLY)
3666 exit(128);
3667 else
3668 die("Log for %s is empty.", refname);
3669 }
Ronnie Sahlberg4207ed22014-06-03 16:09:59[diff] [blame]3670 if (cb.found_it)
3671 return 0;
Junio C Hamano16d7cc92007-01-19 09:19:05[diff] [blame]3672
Ronnie Sahlberg4207ed22014-06-03 16:09:59[diff] [blame]3673 for_each_reflog_ent(refname, read_ref_at_ent_oldest, &cb);
3674
Junio C Hamano16d7cc92007-01-19 09:19:05[diff] [blame]3675 return 1;
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]3676}
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]3677
Ronnie Sahlberg4da58832014-05-06 22:45:52[diff] [blame]3678int reflog_exists(const char *refname)
3679{
3680 struct stat st;
3681
3682 return !lstat(git_path("logs/%s", refname), &st) &&
3683 S_ISREG(st.st_mode);
3684}
3685
3686int delete_reflog(const char *refname)
3687{
3688 return remove_path(git_path("logs/%s", refname));
3689}
3690
Junio C Hamano9a7a1832013-03-08 18:36:43[diff] [blame]3691static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data)
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]3692{
Junio C Hamano9a7a1832013-03-08 18:36:43[diff] [blame]3693 unsigned char osha1[20], nsha1[20];
3694 char *email_end, *message;
3695 unsigned long timestamp;
3696 int tz;
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]3697
Junio C Hamano9a7a1832013-03-08 18:36:43[diff] [blame]3698 /* old SP new SP name <email> SP time TAB msg LF */
3699 if (sb->len < 83 || sb->buf[sb->len - 1] != '\n' ||
3700 get_sha1_hex(sb->buf, osha1) || sb->buf[40] != ' ' ||
3701 get_sha1_hex(sb->buf + 41, nsha1) || sb->buf[81] != ' ' ||
3702 !(email_end = strchr(sb->buf + 82, '>')) ||
3703 email_end[1] != ' ' ||
3704 !(timestamp = strtoul(email_end + 2, &message, 10)) ||
3705 !message || message[0] != ' ' ||
3706 (message[1] != '+' && message[1] != '-') ||
3707 !isdigit(message[2]) || !isdigit(message[3]) ||
3708 !isdigit(message[4]) || !isdigit(message[5]))
3709 return 0; /* corrupt? */
3710 email_end[1] = '\0';
3711 tz = strtol(message + 1, NULL, 10);
3712 if (message[6] != '\t')
3713 message += 6;
3714 else
3715 message += 7;
3716 return fn(osha1, nsha1, sb->buf + 82, timestamp, tz, message, cb_data);
3717}
3718
Junio C Hamano98f85ff2013-03-08 21:27:37[diff] [blame]3719static char *find_beginning_of_line(char *bob, char *scan)
3720{
3721 while (bob < scan && *(--scan) != '\n')
3722 ; /* keep scanning backwards */
3723 /*
3724 * Return either beginning of the buffer, or LF at the end of
3725 * the previous line.
3726 */
3727 return scan;
3728}
3729
3730int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void *cb_data)
3731{
3732 struct strbuf sb = STRBUF_INIT;
3733 FILE *logfp;
3734 long pos;
3735 int ret = 0, at_tail = 1;
3736
3737 logfp = fopen(git_path("logs/%s", refname), "r");
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]3738 if (!logfp)
Johannes Schindelin883d60f2007-01-08 00:59:54[diff] [blame]3739 return -1;
Junio C Hamano101d15e2009-01-20 06:18:29[diff] [blame]3740
Junio C Hamano98f85ff2013-03-08 21:27:37[diff] [blame]3741 /* Jump to the end */
3742 if (fseek(logfp, 0, SEEK_END) < 0)
3743 return error("cannot seek back reflog for %s: %s",
3744 refname, strerror(errno));
3745 pos = ftell(logfp);
3746 while (!ret && 0 < pos) {
3747 int cnt;
3748 size_t nread;
3749 char buf[BUFSIZ];
3750 char *endp, *scanp;
3751
3752 /* Fill next block from the end */
3753 cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos;
3754 if (fseek(logfp, pos - cnt, SEEK_SET))
3755 return error("cannot seek back reflog for %s: %s",
3756 refname, strerror(errno));
3757 nread = fread(buf, cnt, 1, logfp);
John Keepinge4ca8192013-03-23 17:16:46[diff] [blame]3758 if (nread != 1)
Junio C Hamano98f85ff2013-03-08 21:27:37[diff] [blame]3759 return error("cannot read %d bytes from reflog for %s: %s",
3760 cnt, refname, strerror(errno));
3761 pos -= cnt;
3762
3763 scanp = endp = buf + cnt;
3764 if (at_tail && scanp[-1] == '\n')
3765 /* Looking at the final LF at the end of the file */
3766 scanp--;
3767 at_tail = 0;
3768
3769 while (buf < scanp) {
3770 /*
3771 * terminating LF of the previous line, or the beginning
3772 * of the buffer.
3773 */
3774 char *bp;
3775
3776 bp = find_beginning_of_line(buf, scanp);
3777
Jeff Kinge5e73ff2014-12-05 01:28:54[diff] [blame]3778 if (*bp == '\n') {
Junio C Hamano98f85ff2013-03-08 21:27:37[diff] [blame]3779 /*
Jeff Kinge5e73ff2014-12-05 01:28:54[diff] [blame]3780 * The newline is the end of the previous line,
3781 * so we know we have complete line starting
3782 * at (bp + 1). Prefix it onto any prior data
3783 * we collected for the line and process it.
Junio C Hamano98f85ff2013-03-08 21:27:37[diff] [blame]3784 */
3785 strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1));
3786 scanp = bp;
3787 endp = bp + 1;
Jeff Kinge5e73ff2014-12-05 01:28:54[diff] [blame]3788 ret = show_one_reflog_ent(&sb, fn, cb_data);
3789 strbuf_reset(&sb);
3790 if (ret)
3791 break;
3792 } else if (!pos) {
3793 /*
3794 * We are at the start of the buffer, and the
3795 * start of the file; there is no previous
3796 * line, and we have everything for this one.
3797 * Process it, and we can end the loop.
3798 */
3799 strbuf_splice(&sb, 0, 0, buf, endp - buf);
3800 ret = show_one_reflog_ent(&sb, fn, cb_data);
3801 strbuf_reset(&sb);
Junio C Hamano98f85ff2013-03-08 21:27:37[diff] [blame]3802 break;
Jeff Kinge5e73ff2014-12-05 01:28:54[diff] [blame]3803 }
3804
3805 if (bp == buf) {
3806 /*
3807 * We are at the start of the buffer, and there
3808 * is more file to read backwards. Which means
3809 * we are in the middle of a line. Note that we
3810 * may get here even if *bp was a newline; that
3811 * just means we are at the exact end of the
3812 * previous line, rather than some spot in the
3813 * middle.
3814 *
3815 * Save away what we have to be combined with
3816 * the data from the next read.
3817 */
3818 strbuf_splice(&sb, 0, 0, buf, endp - buf);
3819 break;
3820 }
Brandon Casey9d33f7c2009-07-16 21:25:18[diff] [blame]3821 }
Junio C Hamano101d15e2009-01-20 06:18:29[diff] [blame]3822
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]3823 }
Junio C Hamano98f85ff2013-03-08 21:27:37[diff] [blame]3824 if (!ret && sb.len)
Jeff King69216bf2014-12-05 01:32:44[diff] [blame]3825 die("BUG: reverse reflog parser had leftover data");
Junio C Hamano98f85ff2013-03-08 21:27:37[diff] [blame]3826
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]3827 fclose(logfp);
René Scharfe8ca78802010-03-13 17:37:50[diff] [blame]3828 strbuf_release(&sb);
Junio C Hamano2266bf22007-01-19 07:25:54[diff] [blame]3829 return ret;
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]3830}
Junio C Hamanoe29cb532006-12-19 06:07:45[diff] [blame]3831
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]3832int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data)
Junio C Hamano101d15e2009-01-20 06:18:29[diff] [blame]3833{
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]3834 FILE *logfp;
René Scharfe8ca78802010-03-13 17:37:50[diff] [blame]3835 struct strbuf sb = STRBUF_INIT;
Junio C Hamano2266bf22007-01-19 07:25:54[diff] [blame]3836 int ret = 0;
Junio C Hamano101d15e2009-01-20 06:18:29[diff] [blame]3837
Junio C Hamano7ae07c12013-03-08 18:45:25[diff] [blame]3838 logfp = fopen(git_path("logs/%s", refname), "r");
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]3839 if (!logfp)
Johannes Schindelin883d60f2007-01-08 00:59:54[diff] [blame]3840 return -1;
Junio C Hamano101d15e2009-01-20 06:18:29[diff] [blame]3841
Junio C Hamano9a7a1832013-03-08 18:36:43[diff] [blame]3842 while (!ret && !strbuf_getwholeline(&sb, logfp, '\n'))
3843 ret = show_one_reflog_ent(&sb, fn, cb_data);
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]3844 fclose(logfp);
René Scharfe8ca78802010-03-13 17:37:50[diff] [blame]3845 strbuf_release(&sb);
Junio C Hamano2266bf22007-01-19 07:25:54[diff] [blame]3846 return ret;
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]3847}
Michael Haggerty989c0e52012-04-24 22:45:14[diff] [blame]3848/*
3849 * Call fn for each reflog in the namespace indicated by name. name
3850 * must be empty or end with '/'. Name will be used as a scratch
3851 * space, but its contents will be restored before return.
3852 */
3853static int do_for_each_reflog(struct strbuf *name, each_ref_fn fn, void *cb_data)
Nicolas Pitreeb8381c2007-02-03 18:25:43[diff] [blame]3854{
Michael Haggerty989c0e52012-04-24 22:45:14[diff] [blame]3855 DIR *d = opendir(git_path("logs/%s", name->buf));
Junio C Hamanofcee5a12007-02-07 17:18:57[diff] [blame]3856 int retval = 0;
Michael Haggerty93c603f2012-04-24 22:45:13[diff] [blame]3857 struct dirent *de;
Michael Haggerty989c0e52012-04-24 22:45:14[diff] [blame]3858 int oldlen = name->len;
Nicolas Pitreeb8381c2007-02-03 18:25:43[diff] [blame]3859
Michael Haggerty93c603f2012-04-24 22:45:13[diff] [blame]3860 if (!d)
Michael Haggerty989c0e52012-04-24 22:45:14[diff] [blame]3861 return name->len ? errno : 0;
Nicolas Pitreeb8381c2007-02-03 18:25:43[diff] [blame]3862
Michael Haggerty93c603f2012-04-24 22:45:13[diff] [blame]3863 while ((de = readdir(d)) != NULL) {
3864 struct stat st;
Nicolas Pitreeb8381c2007-02-03 18:25:43[diff] [blame]3865
Michael Haggerty93c603f2012-04-24 22:45:13[diff] [blame]3866 if (de->d_name[0] == '.')
3867 continue;
Jeff King2975c772014-06-30 16:58:25[diff] [blame]3868 if (ends_with(de->d_name, ".lock"))
Michael Haggerty93c603f2012-04-24 22:45:13[diff] [blame]3869 continue;
Michael Haggerty989c0e52012-04-24 22:45:14[diff] [blame]3870 strbuf_addstr(name, de->d_name);
3871 if (stat(git_path("logs/%s", name->buf), &st) < 0) {
3872 ; /* silently ignore */
Michael Haggerty93c603f2012-04-24 22:45:13[diff] [blame]3873 } else {
Nicolas Pitreeb8381c2007-02-03 18:25:43[diff] [blame]3874 if (S_ISDIR(st.st_mode)) {
Michael Haggerty989c0e52012-04-24 22:45:14[diff] [blame]3875 strbuf_addch(name, '/');
3876 retval = do_for_each_reflog(name, fn, cb_data);
Nicolas Pitreeb8381c2007-02-03 18:25:43[diff] [blame]3877 } else {
Michael Haggerty2b2a5be2015-05-25 18:38:28[diff] [blame]3878 struct object_id oid;
3879
3880 if (read_ref_full(name->buf, 0, oid.hash, NULL))
Michael Haggerty989c0e52012-04-24 22:45:14[diff] [blame]3881 retval = error("bad ref for %s", name->buf);
Nicolas Pitreeb8381c2007-02-03 18:25:43[diff] [blame]3882 else
Michael Haggerty2b2a5be2015-05-25 18:38:28[diff] [blame]3883 retval = fn(name->buf, &oid, 0, cb_data);
Nicolas Pitreeb8381c2007-02-03 18:25:43[diff] [blame]3884 }
3885 if (retval)
3886 break;
3887 }
Michael Haggerty989c0e52012-04-24 22:45:14[diff] [blame]3888 strbuf_setlen(name, oldlen);
Nicolas Pitreeb8381c2007-02-03 18:25:43[diff] [blame]3889 }
Michael Haggerty93c603f2012-04-24 22:45:13[diff] [blame]3890 closedir(d);
Nicolas Pitreeb8381c2007-02-03 18:25:43[diff] [blame]3891 return retval;
3892}
3893
3894int for_each_reflog(each_ref_fn fn, void *cb_data)
3895{
Michael Haggerty989c0e52012-04-24 22:45:14[diff] [blame]3896 int retval;
3897 struct strbuf name;
3898 strbuf_init(&name, PATH_MAX);
3899 retval = do_for_each_reflog(&name, fn, cb_data);
3900 strbuf_release(&name);
3901 return retval;
Nicolas Pitreeb8381c2007-02-03 18:25:43[diff] [blame]3902}
Carlos Rica3d9f0372007-09-05 01:38:24[diff] [blame]3903
Michael Haggertyb5c8ea22014-04-07 13:48:12[diff] [blame]3904/**
Michael Haggerty8df4e512015-02-17 17:00:14[diff] [blame]3905 * Information needed for a single ref update. Set new_sha1 to the new
3906 * value or to null_sha1 to delete the ref. To check the old value
3907 * while the ref is locked, set (flags & REF_HAVE_OLD) and set
3908 * old_sha1 to the old value, or to null_sha1 to ensure the ref does
3909 * not exist before update.
Michael Haggertyb5c8ea22014-04-07 13:48:12[diff] [blame]3910 */
3911struct ref_update {
Michael Haggerty16180332015-02-17 17:00:21[diff] [blame]3912 /*
3913 * If (flags & REF_HAVE_NEW), set the reference to this value:
3914 */
Michael Haggertyb5c8ea22014-04-07 13:48:12[diff] [blame]3915 unsigned char new_sha1[20];
Michael Haggerty16180332015-02-17 17:00:21[diff] [blame]3916 /*
3917 * If (flags & REF_HAVE_OLD), check that the reference
3918 * previously had this value:
3919 */
Michael Haggertyb5c8ea22014-04-07 13:48:12[diff] [blame]3920 unsigned char old_sha1[20];
Michael Haggerty8df4e512015-02-17 17:00:14[diff] [blame]3921 /*
Michael Haggerty16180332015-02-17 17:00:21[diff] [blame]3922 * One or more of REF_HAVE_NEW, REF_HAVE_OLD, REF_NODEREF,
Michael Haggerty8df4e512015-02-17 17:00:14[diff] [blame]3923 * REF_DELETING, and REF_ISPRUNING:
3924 */
3925 unsigned int flags;
Michael Haggerty81c960e2014-04-07 13:48:16[diff] [blame]3926 struct ref_lock *lock;
Michael Haggerty84178db2014-04-07 13:48:17[diff] [blame]3927 int type;
Ronnie Sahlbergdb7516a2014-04-30 19:22:42[diff] [blame]3928 char *msg;
Michael Haggerty88615912014-04-07 13:48:14[diff] [blame]3929 const char refname[FLEX_ARRAY];
Michael Haggertyb5c8ea22014-04-07 13:48:12[diff] [blame]3930};
3931
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]3932/*
Ronnie Sahlberg2bdc7852014-04-29 19:06:19[diff] [blame]3933 * Transaction states.
3934 * OPEN: The transaction is in a valid state and can accept new updates.
3935 * An OPEN transaction can be committed.
3936 * CLOSED: A closed transaction is no longer active and no other operations
3937 * than free can be used on it in this state.
3938 * A transaction can either become closed by successfully committing
3939 * an active transaction or if there is a failure while building
3940 * the transaction thus rendering it failed/inactive.
3941 */
3942enum ref_transaction_state {
3943 REF_TRANSACTION_OPEN = 0,
3944 REF_TRANSACTION_CLOSED = 1
3945};
3946
3947/*
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]3948 * Data structure for holding a reference transaction, which can
3949 * consist of checks and updates to multiple references, carried out
3950 * as atomically as possible. This structure is opaque to callers.
3951 */
3952struct ref_transaction {
3953 struct ref_update **updates;
3954 size_t alloc;
3955 size_t nr;
Ronnie Sahlberg2bdc7852014-04-29 19:06:19[diff] [blame]3956 enum ref_transaction_state state;
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]3957};
3958
Ronnie Sahlberg93a644e2014-05-19 17:42:34[diff] [blame]3959struct ref_transaction *ref_transaction_begin(struct strbuf *err)
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]3960{
Jonathan Nieder5a603b02014-08-28 23:42:37[diff] [blame]3961 assert(err);
3962
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]3963 return xcalloc(1, sizeof(struct ref_transaction));
3964}
3965
Ronnie Sahlberg026bd1d2014-06-20 14:42:42[diff] [blame]3966void ref_transaction_free(struct ref_transaction *transaction)
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]3967{
3968 int i;
3969
Ronnie Sahlberg1b072552014-06-20 14:42:45[diff] [blame]3970 if (!transaction)
3971 return;
3972
Ronnie Sahlbergdb7516a2014-04-30 19:22:42[diff] [blame]3973 for (i = 0; i < transaction->nr; i++) {
3974 free(transaction->updates[i]->msg);
Michael Haggerty88615912014-04-07 13:48:14[diff] [blame]3975 free(transaction->updates[i]);
Ronnie Sahlbergdb7516a2014-04-30 19:22:42[diff] [blame]3976 }
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]3977 free(transaction->updates);
3978 free(transaction);
3979}
3980
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]3981static struct ref_update *add_update(struct ref_transaction *transaction,
3982 const char *refname)
3983{
Michael Haggerty88615912014-04-07 13:48:14[diff] [blame]3984 size_t len = strlen(refname);
3985 struct ref_update *update = xcalloc(1, sizeof(*update) + len + 1);
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]3986
Michael Haggerty88615912014-04-07 13:48:14[diff] [blame]3987 strcpy((char *)update->refname, refname);
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]3988 ALLOC_GROW(transaction->updates, transaction->nr + 1, transaction->alloc);
3989 transaction->updates[transaction->nr++] = update;
3990 return update;
3991}
3992
Ronnie Sahlberg8e348002014-06-20 14:43:00[diff] [blame]3993int ref_transaction_update(struct ref_transaction *transaction,
3994 const char *refname,
3995 const unsigned char *new_sha1,
3996 const unsigned char *old_sha1,
Michael Haggerty1d147bd2015-02-17 17:00:15[diff] [blame]3997 unsigned int flags, const char *msg,
Ronnie Sahlberg8e348002014-06-20 14:43:00[diff] [blame]3998 struct strbuf *err)
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]3999{
Ronnie Sahlberg8e348002014-06-20 14:43:00[diff] [blame]4000 struct ref_update *update;
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]4001
Jonathan Nieder5a603b02014-08-28 23:42:37[diff] [blame]4002 assert(err);
4003
Ronnie Sahlberg2bdc7852014-04-29 19:06:19[diff] [blame]4004 if (transaction->state != REF_TRANSACTION_OPEN)
4005 die("BUG: update called for transaction that is not open");
4006
Michael Haggerty16180332015-02-17 17:00:21[diff] [blame]4007 if (new_sha1 && !is_null_sha1(new_sha1) &&
Ronnie Sahlbergd0f810f2014-09-03 18:45:43[diff] [blame]4008 check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
4009 strbuf_addf(err, "refusing to update ref with bad name %s",
4010 refname);
4011 return -1;
4012 }
4013
Ronnie Sahlberg8e348002014-06-20 14:43:00[diff] [blame]4014 update = add_update(transaction, refname);
Michael Haggerty16180332015-02-17 17:00:21[diff] [blame]4015 if (new_sha1) {
4016 hashcpy(update->new_sha1, new_sha1);
4017 flags |= REF_HAVE_NEW;
4018 }
Michael Haggerty1d147bd2015-02-17 17:00:15[diff] [blame]4019 if (old_sha1) {
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]4020 hashcpy(update->old_sha1, old_sha1);
Michael Haggerty8df4e512015-02-17 17:00:14[diff] [blame]4021 flags |= REF_HAVE_OLD;
4022 }
4023 update->flags = flags;
Ronnie Sahlbergdb7516a2014-04-30 19:22:42[diff] [blame]4024 if (msg)
4025 update->msg = xstrdup(msg);
Ronnie Sahlberg8e348002014-06-20 14:43:00[diff] [blame]4026 return 0;
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]4027}
4028
Ronnie Sahlbergb416af52014-04-16 22:26:44[diff] [blame]4029int ref_transaction_create(struct ref_transaction *transaction,
4030 const char *refname,
4031 const unsigned char *new_sha1,
Michael Haggertyfec14ec2015-02-17 17:00:13[diff] [blame]4032 unsigned int flags, const char *msg,
Ronnie Sahlbergb416af52014-04-16 22:26:44[diff] [blame]4033 struct strbuf *err)
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]4034{
Michael Haggertyf04c5b52015-02-17 17:00:19[diff] [blame]4035 if (!new_sha1 || is_null_sha1(new_sha1))
4036 die("BUG: create called without valid new_sha1");
Ronnie Sahlbergbc9f2922014-12-04 23:08:13[diff] [blame]4037 return ref_transaction_update(transaction, refname, new_sha1,
Michael Haggerty1d147bd2015-02-17 17:00:15[diff] [blame]4038 null_sha1, flags, msg, err);
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]4039}
4040
Ronnie Sahlberg8c8bdc02014-04-16 22:27:45[diff] [blame]4041int ref_transaction_delete(struct ref_transaction *transaction,
4042 const char *refname,
4043 const unsigned char *old_sha1,
Michael Haggertyfb5a6bb2015-02-17 17:00:16[diff] [blame]4044 unsigned int flags, const char *msg,
Ronnie Sahlberg8c8bdc02014-04-16 22:27:45[diff] [blame]4045 struct strbuf *err)
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]4046{
Michael Haggerty60294592015-02-17 17:00:20[diff] [blame]4047 if (old_sha1 && is_null_sha1(old_sha1))
4048 die("BUG: delete called with old_sha1 set to zeros");
Michael Haggerty1d147bd2015-02-17 17:00:15[diff] [blame]4049 return ref_transaction_update(transaction, refname,
Michael Haggertyfb5a6bb2015-02-17 17:00:16[diff] [blame]4050 null_sha1, old_sha1,
Michael Haggerty1d147bd2015-02-17 17:00:15[diff] [blame]4051 flags, msg, err);
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]4052}
4053
Michael Haggerty16180332015-02-17 17:00:21[diff] [blame]4054int ref_transaction_verify(struct ref_transaction *transaction,
4055 const char *refname,
4056 const unsigned char *old_sha1,
4057 unsigned int flags,
4058 struct strbuf *err)
4059{
4060 if (!old_sha1)
4061 die("BUG: verify called with old_sha1 set to NULL");
4062 return ref_transaction_update(transaction, refname,
4063 NULL, old_sha1,
4064 flags, NULL, err);
4065}
4066
Michael Haggerty4b7b5202015-02-17 17:00:22[diff] [blame]4067int update_ref(const char *msg, const char *refname,
4068 const unsigned char *new_sha1, const unsigned char *old_sha1,
Michael Haggertyfec14ec2015-02-17 17:00:13[diff] [blame]4069 unsigned int flags, enum action_on_err onerr)
Brad King4738a332013-09-04 15:22:40[diff] [blame]4070{
David Turner74ec19d2015-07-31 06:06:19[diff] [blame]4071 struct ref_transaction *t = NULL;
Ronnie Sahlbergb4d75ac2014-04-24 23:36:55[diff] [blame]4072 struct strbuf err = STRBUF_INIT;
David Turner74ec19d2015-07-31 06:06:19[diff] [blame]4073 int ret = 0;
Ronnie Sahlbergb4d75ac2014-04-24 23:36:55[diff] [blame]4074
David Turner74ec19d2015-07-31 06:06:19[diff] [blame]4075 if (ref_type(refname) == REF_TYPE_PSEUDOREF) {
4076 ret = write_pseudoref(refname, new_sha1, old_sha1, &err);
4077 } else {
4078 t = ref_transaction_begin(&err);
4079 if (!t ||
4080 ref_transaction_update(t, refname, new_sha1, old_sha1,
4081 flags, msg, &err) ||
4082 ref_transaction_commit(t, &err)) {
4083 ret = 1;
4084 ref_transaction_free(t);
4085 }
4086 }
4087 if (ret) {
Ronnie Sahlbergb4d75ac2014-04-24 23:36:55[diff] [blame]4088 const char *str = "update_ref failed for ref '%s': %s";
4089
Ronnie Sahlbergb4d75ac2014-04-24 23:36:55[diff] [blame]4090 switch (onerr) {
4091 case UPDATE_REFS_MSG_ON_ERR:
4092 error(str, refname, err.buf);
4093 break;
4094 case UPDATE_REFS_DIE_ON_ERR:
4095 die(str, refname, err.buf);
4096 break;
4097 case UPDATE_REFS_QUIET_ON_ERR:
4098 break;
4099 }
4100 strbuf_release(&err);
Brad King4738a332013-09-04 15:22:40[diff] [blame]4101 return 1;
Ronnie Sahlbergb4d75ac2014-04-24 23:36:55[diff] [blame]4102 }
4103 strbuf_release(&err);
David Turner74ec19d2015-07-31 06:06:19[diff] [blame]4104 if (t)
4105 ref_transaction_free(t);
Ronnie Sahlbergb4d75ac2014-04-24 23:36:55[diff] [blame]4106 return 0;
Brad King4738a332013-09-04 15:22:40[diff] [blame]4107}
4108
Michael Haggerty07f9c882015-05-11 15:25:11[diff] [blame]4109static int ref_update_reject_duplicates(struct string_list *refnames,
Ronnie Sahlberg013198372014-06-20 14:42:59[diff] [blame]4110 struct strbuf *err)
Brad King98aee922013-09-04 15:22:43[diff] [blame]4111{
Michael Haggerty07f9c882015-05-11 15:25:11[diff] [blame]4112 int i, n = refnames->nr;
Jonathan Nieder5a603b02014-08-28 23:42:37[diff] [blame]4113
4114 assert(err);
4115
Brad King98aee922013-09-04 15:22:43[diff] [blame]4116 for (i = 1; i < n; i++)
Michael Haggerty07f9c882015-05-11 15:25:11[diff] [blame]4117 if (!strcmp(refnames->items[i - 1].string, refnames->items[i].string)) {
Jonathan Nieder5a603b02014-08-28 23:42:37[diff] [blame]4118 strbuf_addf(err,
4119 "Multiple updates for ref '%s' not allowed.",
Michael Haggerty07f9c882015-05-11 15:25:11[diff] [blame]4120 refnames->items[i].string);
Brad King98aee922013-09-04 15:22:43[diff] [blame]4121 return 1;
4122 }
4123 return 0;
4124}
4125
Michael Haggertyb5c8ea22014-04-07 13:48:12[diff] [blame]4126int ref_transaction_commit(struct ref_transaction *transaction,
Ronnie Sahlbergdb7516a2014-04-30 19:22:42[diff] [blame]4127 struct strbuf *err)
Brad King98aee922013-09-04 15:22:43[diff] [blame]4128{
Michael Haggerty4a45b2f2014-11-25 08:02:32[diff] [blame]4129 int ret = 0, i;
Michael Haggertyb5c8ea22014-04-07 13:48:12[diff] [blame]4130 int n = transaction->nr;
Michael Haggerty6a402332014-04-07 13:48:18[diff] [blame]4131 struct ref_update **updates = transaction->updates;
Michael Haggerty4a45b2f2014-11-25 08:02:32[diff] [blame]4132 struct string_list refs_to_delete = STRING_LIST_INIT_NODUP;
4133 struct string_list_item *ref_to_delete;
Michael Haggerty07f9c882015-05-11 15:25:11[diff] [blame]4134 struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
Brad King98aee922013-09-04 15:22:43[diff] [blame]4135
Jonathan Nieder5a603b02014-08-28 23:42:37[diff] [blame]4136 assert(err);
4137
Ronnie Sahlberg2bdc7852014-04-29 19:06:19[diff] [blame]4138 if (transaction->state != REF_TRANSACTION_OPEN)
4139 die("BUG: commit called for transaction that is not open");
4140
4141 if (!n) {
4142 transaction->state = REF_TRANSACTION_CLOSED;
Brad King98aee922013-09-04 15:22:43[diff] [blame]4143 return 0;
Ronnie Sahlberg2bdc7852014-04-29 19:06:19[diff] [blame]4144 }
Brad King98aee922013-09-04 15:22:43[diff] [blame]4145
Michael Haggerty07f9c882015-05-11 15:25:11[diff] [blame]4146 /* Fail if a refname appears more than once in the transaction: */
4147 for (i = 0; i < n; i++)
4148 string_list_append(&affected_refnames, updates[i]->refname);
4149 string_list_sort(&affected_refnames);
4150 if (ref_update_reject_duplicates(&affected_refnames, err)) {
Ronnie Sahlberg28e6a972014-05-16 21:14:38[diff] [blame]4151 ret = TRANSACTION_GENERIC_ERROR;
Brad King98aee922013-09-04 15:22:43[diff] [blame]4152 goto cleanup;
Ronnie Sahlberg28e6a972014-05-16 21:14:38[diff] [blame]4153 }
Brad King98aee922013-09-04 15:22:43[diff] [blame]4154
Michael Haggertycf018ee2015-04-24 11:35:49[diff] [blame]4155 /*
4156 * Acquire all locks, verify old values if provided, check
4157 * that new values are valid, and write new values to the
4158 * lockfiles, ready to be activated. Only keep one lockfile
4159 * open at a time to avoid running out of file descriptors.
4160 */
Brad King98aee922013-09-04 15:22:43[diff] [blame]4161 for (i = 0; i < n; i++) {
Michael Haggertycb198d22014-04-07 13:48:15[diff] [blame]4162 struct ref_update *update = updates[i];
Michael Haggertycb198d22014-04-07 13:48:15[diff] [blame]4163
Michael Haggertycbf50f92015-04-24 11:35:48[diff] [blame]4164 if ((update->flags & REF_HAVE_NEW) &&
4165 is_null_sha1(update->new_sha1))
4166 update->flags |= REF_DELETING;
Michael Haggerty8df4e512015-02-17 17:00:14[diff] [blame]4167 update->lock = lock_ref_sha1_basic(
4168 update->refname,
4169 ((update->flags & REF_HAVE_OLD) ?
4170 update->old_sha1 : NULL),
Michael Haggertye9111042015-05-11 15:25:12[diff] [blame]4171 &affected_refnames, NULL,
Michael Haggertycbf50f92015-04-24 11:35:48[diff] [blame]4172 update->flags,
Michael Haggerty4a32b2e2015-05-11 15:25:15[diff] [blame]4173 &update->type,
4174 err);
Michael Haggerty81c960e2014-04-07 13:48:16[diff] [blame]4175 if (!update->lock) {
Michael Haggertycbaabcb2015-05-11 15:25:18[diff] [blame]4176 char *reason;
4177
Ronnie Sahlberg28e6a972014-05-16 21:14:38[diff] [blame]4178 ret = (errno == ENOTDIR)
4179 ? TRANSACTION_NAME_CONFLICT
4180 : TRANSACTION_GENERIC_ERROR;
Michael Haggertycbaabcb2015-05-11 15:25:18[diff] [blame]4181 reason = strbuf_detach(err, NULL);
Michael Haggertyc2e0a712015-05-22 23:34:57[diff] [blame]4182 strbuf_addf(err, "cannot lock ref '%s': %s",
Michael Haggertycbaabcb2015-05-11 15:25:18[diff] [blame]4183 update->refname, reason);
4184 free(reason);
Brad King98aee922013-09-04 15:22:43[diff] [blame]4185 goto cleanup;
4186 }
Michael Haggertycf018ee2015-04-24 11:35:49[diff] [blame]4187 if ((update->flags & REF_HAVE_NEW) &&
4188 !(update->flags & REF_DELETING)) {
Stefan Beller5a6f4702015-03-03 11:43:14[diff] [blame]4189 int overwriting_symref = ((update->type & REF_ISSYMREF) &&
4190 (update->flags & REF_NODEREF));
4191
Michael Haggertycf018ee2015-04-24 11:35:49[diff] [blame]4192 if (!overwriting_symref &&
Michael Haggerty5cb901a2015-05-25 18:39:22[diff] [blame]4193 !hashcmp(update->lock->old_oid.hash, update->new_sha1)) {
Stefan Beller5a6f4702015-03-03 11:43:14[diff] [blame]4194 /*
4195 * The reference already has the desired
4196 * value, so we don't need to write it.
4197 */
Michael Haggerty61e51e02015-05-09 15:29:20[diff] [blame]4198 } else if (write_ref_to_lockfile(update->lock,
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]4199 update->new_sha1,
4200 err)) {
4201 char *write_err = strbuf_detach(err, NULL);
4202
Michael Haggertycf018ee2015-04-24 11:35:49[diff] [blame]4203 /*
4204 * The lock was freed upon failure of
4205 * write_ref_to_lockfile():
4206 */
Michael Haggerty706d5f82015-03-02 09:29:52[diff] [blame]4207 update->lock = NULL;
David Turnera4c653d2015-07-21 21:04:50[diff] [blame]4208 strbuf_addf(err,
4209 "cannot update the ref '%s': %s",
4210 update->refname, write_err);
4211 free(write_err);
Ronnie Sahlberg28e6a972014-05-16 21:14:38[diff] [blame]4212 ret = TRANSACTION_GENERIC_ERROR;
Brad King98aee922013-09-04 15:22:43[diff] [blame]4213 goto cleanup;
Michael Haggerty706d5f82015-03-02 09:29:52[diff] [blame]4214 } else {
Michael Haggertycf018ee2015-04-24 11:35:49[diff] [blame]4215 update->flags |= REF_NEEDS_COMMIT;
4216 }
4217 }
4218 if (!(update->flags & REF_NEEDS_COMMIT)) {
4219 /*
4220 * We didn't have to write anything to the lockfile.
4221 * Close it to free up the file descriptor:
4222 */
4223 if (close_ref(update->lock)) {
4224 strbuf_addf(err, "Couldn't close %s.lock",
4225 update->refname);
4226 goto cleanup;
4227 }
4228 }
4229 }
4230
4231 /* Perform updates first so live commits remain referenced */
4232 for (i = 0; i < n; i++) {
4233 struct ref_update *update = updates[i];
4234
4235 if (update->flags & REF_NEEDS_COMMIT) {
4236 if (commit_ref_update(update->lock,
David Turner0f2a71d2015-07-21 21:04:54[diff] [blame]4237 update->new_sha1, update->msg,
4238 update->flags, err)) {
Michael Haggertycf018ee2015-04-24 11:35:49[diff] [blame]4239 /* freed by commit_ref_update(): */
4240 update->lock = NULL;
Michael Haggertycf018ee2015-04-24 11:35:49[diff] [blame]4241 ret = TRANSACTION_GENERIC_ERROR;
4242 goto cleanup;
4243 } else {
4244 /* freed by commit_ref_update(): */
Michael Haggerty706d5f82015-03-02 09:29:52[diff] [blame]4245 update->lock = NULL;
Ronnie Sahlberg04ad6222014-04-29 20:42:07[diff] [blame]4246 }
Brad King98aee922013-09-04 15:22:43[diff] [blame]4247 }
Michael Haggertycb198d22014-04-07 13:48:15[diff] [blame]4248 }
Brad King98aee922013-09-04 15:22:43[diff] [blame]4249
4250 /* Perform deletes now that updates are safely completed */
Michael Haggerty81c960e2014-04-07 13:48:16[diff] [blame]4251 for (i = 0; i < n; i++) {
4252 struct ref_update *update = updates[i];
4253
Michael Haggertycf018ee2015-04-24 11:35:49[diff] [blame]4254 if (update->flags & REF_DELETING) {
Jonathan Nieder65732842014-08-29 00:01:35[diff] [blame]4255 if (delete_ref_loose(update->lock, update->type, err)) {
Ronnie Sahlberg28e6a972014-05-16 21:14:38[diff] [blame]4256 ret = TRANSACTION_GENERIC_ERROR;
Jonathan Nieder65732842014-08-29 00:01:35[diff] [blame]4257 goto cleanup;
4258 }
Ronnie Sahlberg28e6a972014-05-16 21:14:38[diff] [blame]4259
Michael Haggertycbf50f92015-04-24 11:35:48[diff] [blame]4260 if (!(update->flags & REF_ISPRUNING))
Michael Haggerty4a45b2f2014-11-25 08:02:32[diff] [blame]4261 string_list_append(&refs_to_delete,
4262 update->lock->ref_name);
Brad King98aee922013-09-04 15:22:43[diff] [blame]4263 }
Michael Haggerty81c960e2014-04-07 13:48:16[diff] [blame]4264 }
4265
Michael Haggerty4a45b2f2014-11-25 08:02:32[diff] [blame]4266 if (repack_without_refs(&refs_to_delete, err)) {
Ronnie Sahlberg28e6a972014-05-16 21:14:38[diff] [blame]4267 ret = TRANSACTION_GENERIC_ERROR;
Jonathan Nieder65732842014-08-29 00:01:35[diff] [blame]4268 goto cleanup;
4269 }
Michael Haggerty4a45b2f2014-11-25 08:02:32[diff] [blame]4270 for_each_string_list_item(ref_to_delete, &refs_to_delete)
4271 unlink_or_warn(git_path("logs/%s", ref_to_delete->string));
Brad King98aee922013-09-04 15:22:43[diff] [blame]4272 clear_loose_ref_cache(&ref_cache);
4273
4274cleanup:
Ronnie Sahlberg2bdc7852014-04-29 19:06:19[diff] [blame]4275 transaction->state = REF_TRANSACTION_CLOSED;
4276
Brad King98aee922013-09-04 15:22:43[diff] [blame]4277 for (i = 0; i < n; i++)
Michael Haggerty81c960e2014-04-07 13:48:16[diff] [blame]4278 if (updates[i]->lock)
4279 unlock_ref(updates[i]->lock);
Michael Haggerty4a45b2f2014-11-25 08:02:32[diff] [blame]4280 string_list_clear(&refs_to_delete, 0);
Michael Haggerty07f9c882015-05-11 15:25:11[diff] [blame]4281 string_list_clear(&affected_refnames, 0);
Michael Haggertycaa40462014-04-07 13:48:10[diff] [blame]4282 return ret;
4283}
4284
Michael Haggertye426ff42015-06-22 14:03:04[diff] [blame]4285static int ref_present(const char *refname,
4286 const struct object_id *oid, int flags, void *cb_data)
4287{
4288 struct string_list *affected_refnames = cb_data;
4289
4290 return string_list_has_string(affected_refnames, refname);
4291}
4292
Michael Haggerty58f233c2015-06-22 14:03:01[diff] [blame]4293int initial_ref_transaction_commit(struct ref_transaction *transaction,
4294 struct strbuf *err)
4295{
Michael Haggertye426ff42015-06-22 14:03:04[diff] [blame]4296 struct ref_dir *loose_refs = get_loose_refs(&ref_cache);
4297 struct ref_dir *packed_refs = get_packed_refs(&ref_cache);
Michael Haggerty58f233c2015-06-22 14:03:01[diff] [blame]4298 int ret = 0, i;
4299 int n = transaction->nr;
4300 struct ref_update **updates = transaction->updates;
Michael Haggertyfb802b32015-06-22 14:03:03[diff] [blame]4301 struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
Michael Haggerty58f233c2015-06-22 14:03:01[diff] [blame]4302
4303 assert(err);
4304
4305 if (transaction->state != REF_TRANSACTION_OPEN)
4306 die("BUG: commit called for transaction that is not open");
4307
Michael Haggertyfb802b32015-06-22 14:03:03[diff] [blame]4308 /* Fail if a refname appears more than once in the transaction: */
4309 for (i = 0; i < n; i++)
4310 string_list_append(&affected_refnames, updates[i]->refname);
4311 string_list_sort(&affected_refnames);
4312 if (ref_update_reject_duplicates(&affected_refnames, err)) {
4313 ret = TRANSACTION_GENERIC_ERROR;
4314 goto cleanup;
4315 }
4316
Michael Haggertye426ff42015-06-22 14:03:04[diff] [blame]4317 /*
4318 * It's really undefined to call this function in an active
4319 * repository or when there are existing references: we are
4320 * only locking and changing packed-refs, so (1) any
4321 * simultaneous processes might try to change a reference at
4322 * the same time we do, and (2) any existing loose versions of
4323 * the references that we are setting would have precedence
4324 * over our values. But some remote helpers create the remote
4325 * "HEAD" and "master" branches before calling this function,
4326 * so here we really only check that none of the references
4327 * that we are creating already exists.
4328 */
4329 if (for_each_rawref(ref_present, &affected_refnames))
4330 die("BUG: initial ref transaction called with existing refs");
4331
Michael Haggerty58f233c2015-06-22 14:03:01[diff] [blame]4332 for (i = 0; i < n; i++) {
4333 struct ref_update *update = updates[i];
4334
4335 if ((update->flags & REF_HAVE_OLD) &&
4336 !is_null_sha1(update->old_sha1))
4337 die("BUG: initial ref transaction with old_sha1 set");
Michael Haggertye426ff42015-06-22 14:03:04[diff] [blame]4338 if (verify_refname_available(update->refname,
4339 &affected_refnames, NULL,
4340 loose_refs, err) ||
4341 verify_refname_available(update->refname,
4342 &affected_refnames, NULL,
4343 packed_refs, err)) {
4344 ret = TRANSACTION_NAME_CONFLICT;
4345 goto cleanup;
4346 }
Michael Haggerty58f233c2015-06-22 14:03:01[diff] [blame]4347 }
4348
4349 if (lock_packed_refs(0)) {
4350 strbuf_addf(err, "unable to lock packed-refs file: %s",
4351 strerror(errno));
4352 ret = TRANSACTION_GENERIC_ERROR;
4353 goto cleanup;
4354 }
4355
4356 for (i = 0; i < n; i++) {
4357 struct ref_update *update = updates[i];
4358
4359 if ((update->flags & REF_HAVE_NEW) &&
4360 !is_null_sha1(update->new_sha1))
4361 add_packed_ref(update->refname, update->new_sha1);
4362 }
4363
4364 if (commit_packed_refs()) {
4365 strbuf_addf(err, "unable to commit packed-refs file: %s",
4366 strerror(errno));
4367 ret = TRANSACTION_GENERIC_ERROR;
4368 goto cleanup;
4369 }
4370
4371cleanup:
4372 transaction->state = REF_TRANSACTION_CLOSED;
Michael Haggertyfb802b32015-06-22 14:03:03[diff] [blame]4373 string_list_clear(&affected_refnames, 0);
Michael Haggerty58f233c2015-06-22 14:03:01[diff] [blame]4374 return ret;
4375}
4376
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]4377char *shorten_unambiguous_ref(const char *refname, int strict)
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]4378{
4379 int i;
4380 static char **scanf_fmts;
4381 static int nr_rules;
4382 char *short_name;
4383
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]4384 if (!nr_rules) {
Michael Haggerty43466632014-01-08 14:43:39[diff] [blame]4385 /*
4386 * Pre-generate scanf formats from ref_rev_parse_rules[].
4387 * Generate a format suitable for scanf from a
4388 * ref_rev_parse_rules rule by interpolating "%s" at the
4389 * location of the "%.*s".
4390 */
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]4391 size_t total_len = 0;
Michael Haggerty84d56332014-01-08 14:43:38[diff] [blame]4392 size_t offset = 0;
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]4393
4394 /* the rule list is NULL terminated, count them first */
Jeff Kinga4165852013-10-24 08:45:13[diff] [blame]4395 for (nr_rules = 0; ref_rev_parse_rules[nr_rules]; nr_rules++)
Michael Haggerty7902fe02014-01-08 14:43:40[diff] [blame]4396 /* -2 for strlen("%.*s") - strlen("%s"); +1 for NUL */
4397 total_len += strlen(ref_rev_parse_rules[nr_rules]) - 2 + 1;
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]4398
4399 scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len);
4400
Michael Haggerty84d56332014-01-08 14:43:38[diff] [blame]4401 offset = 0;
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]4402 for (i = 0; i < nr_rules; i++) {
Michael Haggerty43466632014-01-08 14:43:39[diff] [blame]4403 assert(offset < total_len);
Michael Haggerty84d56332014-01-08 14:43:38[diff] [blame]4404 scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] + offset;
Michael Haggerty43466632014-01-08 14:43:39[diff] [blame]4405 offset += snprintf(scanf_fmts[i], total_len - offset,
4406 ref_rev_parse_rules[i], 2, "%s") + 1;
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]4407 }
4408 }
4409
4410 /* bail out if there are no rules */
4411 if (!nr_rules)
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]4412 return xstrdup(refname);
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]4413
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]4414 /* buffer for scanf result, at most refname must fit */
4415 short_name = xstrdup(refname);
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]4416
4417 /* skip first rule, it will always match */
4418 for (i = nr_rules - 1; i > 0 ; --i) {
4419 int j;
Bert Wesarg6e7b3302009-04-13 10:25:46[diff] [blame]4420 int rules_to_fail = i;
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]4421 int short_name_len;
4422
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]4423 if (1 != sscanf(refname, scanf_fmts[i], short_name))
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]4424 continue;
4425
4426 short_name_len = strlen(short_name);
4427
4428 /*
Bert Wesarg6e7b3302009-04-13 10:25:46[diff] [blame]4429 * in strict mode, all (except the matched one) rules
4430 * must fail to resolve to a valid non-ambiguous ref
4431 */
4432 if (strict)
4433 rules_to_fail = nr_rules;
4434
4435 /*
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]4436 * check if the short name resolves to a valid ref,
4437 * but use only rules prior to the matched one
4438 */
Bert Wesarg6e7b3302009-04-13 10:25:46[diff] [blame]4439 for (j = 0; j < rules_to_fail; j++) {
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]4440 const char *rule = ref_rev_parse_rules[j];
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]4441 char refname[PATH_MAX];
4442
Bert Wesarg6e7b3302009-04-13 10:25:46[diff] [blame]4443 /* skip matched rule */
4444 if (i == j)
4445 continue;
4446
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]4447 /*
4448 * the short name is ambiguous, if it resolves
4449 * (with this previous rule) to a valid ref
4450 * read_ref() returns 0 on success
4451 */
4452 mksnpath(refname, sizeof(refname),
4453 rule, short_name_len, short_name);
Nguyễn Thái Ngọc Duyc6893322011-11-13 10:22:14[diff] [blame]4454 if (ref_exists(refname))
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]4455 break;
4456 }
4457
4458 /*
4459 * short name is non-ambiguous if all previous rules
4460 * haven't resolved to a valid ref
4461 */
Bert Wesarg6e7b3302009-04-13 10:25:46[diff] [blame]4462 if (j == rules_to_fail)
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]4463 return short_name;
4464 }
4465
4466 free(short_name);
Michael Haggertydfefa932011-12-12 05:38:09[diff] [blame]4467 return xstrdup(refname);
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]4468}
Junio C Hamanodaebaa72013-01-19 00:08:30[diff] [blame]4469
4470static struct string_list *hide_refs;
4471
4472int parse_hide_refs_config(const char *var, const char *value, const char *section)
4473{
4474 if (!strcmp("transfer.hiderefs", var) ||
4475 /* NEEDSWORK: use parse_config_key() once both are merged */
Christian Couder59556542013-11-30 20:55:40[diff] [blame]4476 (starts_with(var, section) && var[strlen(section)] == '.' &&
Junio C Hamanodaebaa72013-01-19 00:08:30[diff] [blame]4477 !strcmp(var + strlen(section), ".hiderefs"))) {
4478 char *ref;
4479 int len;
4480
4481 if (!value)
4482 return config_error_nonbool(var);
4483 ref = xstrdup(value);
4484 len = strlen(ref);
4485 while (len && ref[len - 1] == '/')
4486 ref[--len] = '\0';
4487 if (!hide_refs) {
4488 hide_refs = xcalloc(1, sizeof(*hide_refs));
4489 hide_refs->strdup_strings = 1;
4490 }
4491 string_list_append(hide_refs, ref);
4492 }
4493 return 0;
4494}
4495
4496int ref_is_hidden(const char *refname)
4497{
Jeff King2bc31d12015-07-28 20:23:26[diff] [blame]4498 int i;
Junio C Hamanodaebaa72013-01-19 00:08:30[diff] [blame]4499
4500 if (!hide_refs)
4501 return 0;
Jeff King2bc31d12015-07-28 20:23:26[diff] [blame]4502 for (i = hide_refs->nr - 1; i >= 0; i--) {
4503 const char *match = hide_refs->items[i].string;
4504 int neg = 0;
Junio C Hamanodaebaa72013-01-19 00:08:30[diff] [blame]4505 int len;
Jeff King2bc31d12015-07-28 20:23:26[diff] [blame]4506
4507 if (*match == '!') {
4508 neg = 1;
4509 match++;
4510 }
4511
4512 if (!starts_with(refname, match))
Junio C Hamanodaebaa72013-01-19 00:08:30[diff] [blame]4513 continue;
Jeff King2bc31d12015-07-28 20:23:26[diff] [blame]4514 len = strlen(match);
Junio C Hamanodaebaa72013-01-19 00:08:30[diff] [blame]4515 if (!refname[len] || refname[len] == '/')
Jeff King2bc31d12015-07-28 20:23:26[diff] [blame]4516 return !neg;
Junio C Hamanodaebaa72013-01-19 00:08:30[diff] [blame]4517 }
4518 return 0;
4519}
Michael Haggertyfa5b1832014-12-12 08:56:59[diff] [blame]4520
4521struct expire_reflog_cb {
4522 unsigned int flags;
4523 reflog_expiry_should_prune_fn *should_prune_fn;
4524 void *policy_cb;
4525 FILE *newlog;
4526 unsigned char last_kept_sha1[20];
4527};
4528
4529static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
4530 const char *email, unsigned long timestamp, int tz,
4531 const char *message, void *cb_data)
4532{
4533 struct expire_reflog_cb *cb = cb_data;
4534 struct expire_reflog_policy_cb *policy_cb = cb->policy_cb;
4535
4536 if (cb->flags & EXPIRE_REFLOGS_REWRITE)
4537 osha1 = cb->last_kept_sha1;
4538
4539 if ((*cb->should_prune_fn)(osha1, nsha1, email, timestamp, tz,
4540 message, policy_cb)) {
4541 if (!cb->newlog)
4542 printf("would prune %s", message);
4543 else if (cb->flags & EXPIRE_REFLOGS_VERBOSE)
4544 printf("prune %s", message);
4545 } else {
4546 if (cb->newlog) {
Stefan Bellerc653e032014-12-12 08:57:03[diff] [blame]4547 fprintf(cb->newlog, "%s %s %s %lu %+05d\t%s",
Michael Haggertyfa5b1832014-12-12 08:56:59[diff] [blame]4548 sha1_to_hex(osha1), sha1_to_hex(nsha1),
Stefan Bellerc653e032014-12-12 08:57:03[diff] [blame]4549 email, timestamp, tz, message);
Michael Haggertyfa5b1832014-12-12 08:56:59[diff] [blame]4550 hashcpy(cb->last_kept_sha1, nsha1);
4551 }
4552 if (cb->flags & EXPIRE_REFLOGS_VERBOSE)
4553 printf("keep %s", message);
4554 }
4555 return 0;
4556}
4557
4558int reflog_expire(const char *refname, const unsigned char *sha1,
4559 unsigned int flags,
4560 reflog_expiry_prepare_fn prepare_fn,
4561 reflog_expiry_should_prune_fn should_prune_fn,
4562 reflog_expiry_cleanup_fn cleanup_fn,
4563 void *policy_cb_data)
4564{
4565 static struct lock_file reflog_lock;
4566 struct expire_reflog_cb cb;
4567 struct ref_lock *lock;
4568 char *log_file;
4569 int status = 0;
Michael Haggerty5e6f0032015-03-03 11:43:16[diff] [blame]4570 int type;
Michael Haggerty4a32b2e2015-05-11 15:25:15[diff] [blame]4571 struct strbuf err = STRBUF_INIT;
Michael Haggertyfa5b1832014-12-12 08:56:59[diff] [blame]4572
4573 memset(&cb, 0, sizeof(cb));
4574 cb.flags = flags;
4575 cb.policy_cb = policy_cb_data;
4576 cb.should_prune_fn = should_prune_fn;
4577
4578 /*
4579 * The reflog file is locked by holding the lock on the
4580 * reference itself, plus we might need to update the
4581 * reference if --updateref was specified:
4582 */
Michael Haggerty4a32b2e2015-05-11 15:25:15[diff] [blame]4583 lock = lock_ref_sha1_basic(refname, sha1, NULL, NULL, 0, &type, &err);
4584 if (!lock) {
Michael Haggertyc628edf2015-05-11 15:25:20[diff] [blame]4585 error("cannot lock ref '%s': %s", refname, err.buf);
Michael Haggerty4a32b2e2015-05-11 15:25:15[diff] [blame]4586 strbuf_release(&err);
Michael Haggertyc628edf2015-05-11 15:25:20[diff] [blame]4587 return -1;
Michael Haggerty4a32b2e2015-05-11 15:25:15[diff] [blame]4588 }
Michael Haggertyfa5b1832014-12-12 08:56:59[diff] [blame]4589 if (!reflog_exists(refname)) {
4590 unlock_ref(lock);
4591 return 0;
4592 }
4593
4594 log_file = git_pathdup("logs/%s", refname);
4595 if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) {
4596 /*
4597 * Even though holding $GIT_DIR/logs/$reflog.lock has
4598 * no locking implications, we use the lock_file
4599 * machinery here anyway because it does a lot of the
4600 * work we need, including cleaning up if the program
4601 * exits unexpectedly.
4602 */
4603 if (hold_lock_file_for_update(&reflog_lock, log_file, 0) < 0) {
4604 struct strbuf err = STRBUF_INIT;
4605 unable_to_lock_message(log_file, errno, &err);
4606 error("%s", err.buf);
4607 strbuf_release(&err);
4608 goto failure;
4609 }
4610 cb.newlog = fdopen_lock_file(&reflog_lock, "w");
4611 if (!cb.newlog) {
4612 error("cannot fdopen %s (%s)",
Michael Haggertyb4fb09e2015-08-10 09:47:39[diff] [blame]4613 get_lock_file_path(&reflog_lock), strerror(errno));
Michael Haggertyfa5b1832014-12-12 08:56:59[diff] [blame]4614 goto failure;
4615 }
4616 }
4617
4618 (*prepare_fn)(refname, sha1, cb.policy_cb);
4619 for_each_reflog_ent(refname, expire_reflog_ent, &cb);
4620 (*cleanup_fn)(cb.policy_cb);
4621
4622 if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) {
Michael Haggerty5e6f0032015-03-03 11:43:16[diff] [blame]4623 /*
4624 * It doesn't make sense to adjust a reference pointed
4625 * to by a symbolic ref based on expiring entries in
Michael Haggerty423c6882015-03-03 11:43:17[diff] [blame]4626 * the symbolic reference's reflog. Nor can we update
4627 * a reference if there are no remaining reflog
4628 * entries.
Michael Haggerty5e6f0032015-03-03 11:43:16[diff] [blame]4629 */
4630 int update = (flags & EXPIRE_REFLOGS_UPDATE_REF) &&
Michael Haggerty423c6882015-03-03 11:43:17[diff] [blame]4631 !(type & REF_ISSYMREF) &&
4632 !is_null_sha1(cb.last_kept_sha1);
Michael Haggerty5e6f0032015-03-03 11:43:16[diff] [blame]4633
Michael Haggertyfa5b1832014-12-12 08:56:59[diff] [blame]4634 if (close_lock_file(&reflog_lock)) {
4635 status |= error("couldn't write %s: %s", log_file,
4636 strerror(errno));
Michael Haggerty5e6f0032015-03-03 11:43:16[diff] [blame]4637 } else if (update &&
Michael Haggertyc99a4c22015-08-10 09:47:38[diff] [blame]4638 (write_in_full(get_lock_file_fd(lock->lk),
Michael Haggertyfa5b1832014-12-12 08:56:59[diff] [blame]4639 sha1_to_hex(cb.last_kept_sha1), 40) != 40 ||
Michael Haggertyc99a4c22015-08-10 09:47:38[diff] [blame]4640 write_str_in_full(get_lock_file_fd(lock->lk), "\n") != 1 ||
4641 close_ref(lock) < 0)) {
Michael Haggertyfa5b1832014-12-12 08:56:59[diff] [blame]4642 status |= error("couldn't write %s",
Michael Haggertyb4fb09e2015-08-10 09:47:39[diff] [blame]4643 get_lock_file_path(lock->lk));
Michael Haggertyfa5b1832014-12-12 08:56:59[diff] [blame]4644 rollback_lock_file(&reflog_lock);
4645 } else if (commit_lock_file(&reflog_lock)) {
4646 status |= error("unable to commit reflog '%s' (%s)",
4647 log_file, strerror(errno));
Michael Haggerty5e6f0032015-03-03 11:43:16[diff] [blame]4648 } else if (update && commit_ref(lock)) {
Michael Haggertyfa5b1832014-12-12 08:56:59[diff] [blame]4649 status |= error("couldn't set %s", lock->ref_name);
4650 }
4651 }
4652 free(log_file);
4653 unlock_ref(lock);
4654 return status;
4655
4656 failure:
4657 rollback_lock_file(&reflog_lock);
4658 free(log_file);
4659 unlock_ref(lock);
4660 return -1;
4661}