🌐 AI搜索 & 代理 主页
Google Git
Sign in
chromium / external / github.com / git / git / refs/tags/v1.7.7 / . / refs.c
blob: a615043b34cd6d0507d8a30f7bd69445ec9f2456 [file] [log] [blame]
Daniel Barkalow95fc7512005-06-06 20:31:29[diff] [blame]1#include "cache.h"
Junio C Hamano85023572006-12-19 22:34:12[diff] [blame]2#include "refs.h"
Junio C Hamanocf0adba2006-11-19 21:22:44[diff] [blame]3#include "object.h"
4#include "tag.h"
Johannes Schindelin7155b722007-09-28 15:28:54[diff] [blame]5#include "dir.h"
Daniel Barkalow95fc7512005-06-06 20:31:29[diff] [blame]6
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]7/* ISSYMREF=01 and ISPACKED=02 are public interfaces */
8#define REF_KNOWS_PEELED 04
Junio C Hamanoe01de1c2010-03-16 05:12:55[diff] [blame]9#define REF_BROKEN 010
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]10
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]11struct ref_list {
12 struct ref_list *next;
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]13 unsigned char flag; /* ISSYMREF? ISPACKED? */
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]14 unsigned char sha1[20];
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]15 unsigned char peeled[20];
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]16 char name[FLEX_ARRAY];
17};
18
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]19static const char *parse_ref_line(char *line, unsigned char *sha1)
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]20{
21 /*
22 * 42: the answer to everything.
23 *
24 * In this case, it happens to be the answer to
25 * 40 (length of sha1 hex representation)
26 * +1 (space in between hex and name)
27 * +1 (newline at the end of the line)
28 */
29 int len = strlen(line) - 42;
30
31 if (len <= 0)
32 return NULL;
33 if (get_sha1_hex(line, sha1) < 0)
34 return NULL;
35 if (!isspace(line[40]))
36 return NULL;
37 line += 41;
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]38 if (isspace(*line))
39 return NULL;
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]40 if (line[len] != '\n')
41 return NULL;
42 line[len] = 0;
Junio C Hamanocf0adba2006-11-19 21:22:44[diff] [blame]43
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]44 return line;
45}
46
Junio C Hamano8da19772006-09-21 05:02:01[diff] [blame]47static struct ref_list *add_ref(const char *name, const unsigned char *sha1,
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]48 int flag, struct ref_list *list,
49 struct ref_list **new_entry)
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]50{
51 int len;
Julian Phillipsc774aab2007-04-17 01:42:50[diff] [blame]52 struct ref_list *entry;
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]53
54 /* Allocate it and add it in.. */
55 len = strlen(name) + 1;
56 entry = xmalloc(sizeof(struct ref_list) + len);
57 hashcpy(entry->sha1, sha1);
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]58 hashclr(entry->peeled);
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]59 memcpy(entry->name, name, len);
Junio C Hamano8da19772006-09-21 05:02:01[diff] [blame]60 entry->flag = flag;
Julian Phillipsc774aab2007-04-17 01:42:50[diff] [blame]61 entry->next = list;
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]62 if (new_entry)
63 *new_entry = entry;
Julian Phillipsc774aab2007-04-17 01:42:50[diff] [blame]64 return entry;
65}
66
67/* merge sort the ref list */
68static struct ref_list *sort_ref_list(struct ref_list *list)
69{
70 int psize, qsize, last_merge_count, cmp;
71 struct ref_list *p, *q, *l, *e;
72 struct ref_list *new_list = list;
73 int k = 1;
74 int merge_count = 0;
75
76 if (!list)
77 return list;
78
79 do {
80 last_merge_count = merge_count;
81 merge_count = 0;
82
83 psize = 0;
84
85 p = new_list;
86 q = new_list;
87 new_list = NULL;
88 l = NULL;
89
90 while (p) {
91 merge_count++;
92
93 while (psize < k && q->next) {
94 q = q->next;
95 psize++;
96 }
97 qsize = k;
98
99 while ((psize > 0) || (qsize > 0 && q)) {
100 if (qsize == 0 || !q) {
101 e = p;
102 p = p->next;
103 psize--;
104 } else if (psize == 0) {
105 e = q;
106 q = q->next;
107 qsize--;
108 } else {
109 cmp = strcmp(q->name, p->name);
110 if (cmp < 0) {
111 e = q;
112 q = q->next;
113 qsize--;
114 } else if (cmp > 0) {
115 e = p;
116 p = p->next;
117 psize--;
118 } else {
119 if (hashcmp(q->sha1, p->sha1))
120 die("Duplicated ref, and SHA1s don't match: %s",
121 q->name);
122 warning("Duplicated ref: %s", q->name);
123 e = q;
124 q = q->next;
125 qsize--;
126 free(e);
127 e = p;
128 p = p->next;
129 psize--;
130 }
131 }
132
133 e->next = NULL;
134
135 if (l)
136 l->next = e;
137 if (!new_list)
138 new_list = e;
139 l = e;
140 }
141
142 p = q;
143 };
144
145 k = k * 2;
146 } while ((last_merge_count != merge_count) || (last_merge_count != 1));
147
148 return new_list;
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]149}
150
Junio C Hamano5e290ff2006-09-30 19:37:37[diff] [blame]151/*
152 * Future: need to be in "struct repository"
153 * when doing a full libification.
154 */
Junio C Hamano4175e9e2007-06-13 08:42:05[diff] [blame]155static struct cached_refs {
Junio C Hamano5e290ff2006-09-30 19:37:37[diff] [blame]156 char did_loose;
157 char did_packed;
158 struct ref_list *loose;
159 struct ref_list *packed;
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]160} cached_refs, submodule_refs;
Shawn O. Pearce0ae91be2008-02-24 08:07:22[diff] [blame]161static struct ref_list *current_ref;
Junio C Hamano5e290ff2006-09-30 19:37:37[diff] [blame]162
Daniel Barkalowe142a3c2008-04-27 17:39:24[diff] [blame]163static struct ref_list *extra_refs;
164
Junio C Hamano5e290ff2006-09-30 19:37:37[diff] [blame]165static void free_ref_list(struct ref_list *list)
166{
167 struct ref_list *next;
168 for ( ; list; list = next) {
169 next = list->next;
170 free(list);
171 }
172}
173
174static void invalidate_cached_refs(void)
175{
176 struct cached_refs *ca = &cached_refs;
177
178 if (ca->did_loose && ca->loose)
179 free_ref_list(ca->loose);
180 if (ca->did_packed && ca->packed)
181 free_ref_list(ca->packed);
182 ca->loose = ca->packed = NULL;
183 ca->did_loose = ca->did_packed = 0;
184}
185
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]186static void read_packed_refs(FILE *f, struct cached_refs *cached_refs)
187{
188 struct ref_list *list = NULL;
189 struct ref_list *last = NULL;
190 char refline[PATH_MAX];
191 int flag = REF_ISPACKED;
192
193 while (fgets(refline, sizeof(refline), f)) {
194 unsigned char sha1[20];
195 const char *name;
196 static const char header[] = "# pack-refs with:";
197
198 if (!strncmp(refline, header, sizeof(header)-1)) {
199 const char *traits = refline + sizeof(header) - 1;
200 if (strstr(traits, " peeled "))
201 flag |= REF_KNOWS_PEELED;
202 /* perhaps other traits later as well */
203 continue;
204 }
205
206 name = parse_ref_line(refline, sha1);
207 if (name) {
208 list = add_ref(name, sha1, flag, list, &last);
209 continue;
210 }
211 if (last &&
212 refline[0] == '^' &&
213 strlen(refline) == 42 &&
214 refline[41] == '\n' &&
215 !get_sha1_hex(refline + 1, sha1))
216 hashcpy(last->peeled, sha1);
217 }
Julian Phillipsc774aab2007-04-17 01:42:50[diff] [blame]218 cached_refs->packed = sort_ref_list(list);
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]219}
220
Daniel Barkalowe142a3c2008-04-27 17:39:24[diff] [blame]221void add_extra_ref(const char *name, const unsigned char *sha1, int flag)
222{
223 extra_refs = add_ref(name, sha1, flag, extra_refs, NULL);
224}
225
226void clear_extra_refs(void)
227{
228 free_ref_list(extra_refs);
229 extra_refs = NULL;
230}
231
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]232static struct ref_list *get_packed_refs(const char *submodule)
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]233{
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]234 const char *packed_refs_file;
235 struct cached_refs *refs;
236
237 if (submodule) {
238 packed_refs_file = git_path_submodule(submodule, "packed-refs");
239 refs = &submodule_refs;
240 free_ref_list(refs->packed);
241 } else {
242 packed_refs_file = git_path("packed-refs");
243 refs = &cached_refs;
244 }
245
246 if (!refs->did_packed || submodule) {
247 FILE *f = fopen(packed_refs_file, "r");
248 refs->packed = NULL;
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]249 if (f) {
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]250 read_packed_refs(f, refs);
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]251 fclose(f);
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]252 }
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]253 refs->did_packed = 1;
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]254 }
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]255 return refs->packed;
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]256}
257
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]258static struct ref_list *get_ref_dir(const char *submodule, const char *base,
259 struct ref_list *list)
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]260{
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]261 DIR *dir;
262 const char *path;
263
264 if (submodule)
265 path = git_path_submodule(submodule, "%s", base);
266 else
267 path = git_path("%s", base);
268
269
270 dir = opendir(path);
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]271
272 if (dir) {
273 struct dirent *de;
274 int baselen = strlen(base);
Linus Torvaldsed378ec2006-09-12 03:17:35[diff] [blame]275 char *ref = xmalloc(baselen + 257);
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]276
Linus Torvaldsed378ec2006-09-12 03:17:35[diff] [blame]277 memcpy(ref, base, baselen);
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]278 if (baselen && base[baselen-1] != '/')
Linus Torvaldsed378ec2006-09-12 03:17:35[diff] [blame]279 ref[baselen++] = '/';
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]280
281 while ((de = readdir(dir)) != NULL) {
282 unsigned char sha1[20];
283 struct stat st;
Junio C Hamano8da19772006-09-21 05:02:01[diff] [blame]284 int flag;
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]285 int namelen;
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]286 const char *refdir;
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]287
288 if (de->d_name[0] == '.')
289 continue;
290 namelen = strlen(de->d_name);
291 if (namelen > 255)
292 continue;
293 if (has_extension(de->d_name, ".lock"))
294 continue;
Linus Torvaldsed378ec2006-09-12 03:17:35[diff] [blame]295 memcpy(ref + baselen, de->d_name, namelen+1);
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]296 refdir = submodule
297 ? git_path_submodule(submodule, "%s", ref)
298 : git_path("%s", ref);
299 if (stat(refdir, &st) < 0)
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]300 continue;
301 if (S_ISDIR(st.st_mode)) {
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]302 list = get_ref_dir(submodule, ref, list);
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]303 continue;
304 }
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]305 if (submodule) {
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]306 hashclr(sha1);
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]307 flag = 0;
308 if (resolve_gitlink_ref(submodule, ref, sha1) < 0) {
309 hashclr(sha1);
310 flag |= REF_BROKEN;
311 }
312 } else
313 if (!resolve_ref(ref, sha1, 1, &flag)) {
314 hashclr(sha1);
315 flag |= REF_BROKEN;
316 }
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]317 list = add_ref(ref, sha1, flag, list, NULL);
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]318 }
Linus Torvaldsed378ec2006-09-12 03:17:35[diff] [blame]319 free(ref);
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]320 closedir(dir);
321 }
Julian Phillipsc774aab2007-04-17 01:42:50[diff] [blame]322 return sort_ref_list(list);
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]323}
324
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]325struct warn_if_dangling_data {
Jay Soffian3cf61342009-11-10 05:03:32[diff] [blame]326 FILE *fp;
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]327 const char *refname;
328 const char *msg_fmt;
329};
330
331static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1,
332 int flags, void *cb_data)
333{
334 struct warn_if_dangling_data *d = cb_data;
335 const char *resolves_to;
336 unsigned char junk[20];
337
338 if (!(flags & REF_ISSYMREF))
339 return 0;
340
341 resolves_to = resolve_ref(refname, junk, 0, NULL);
342 if (!resolves_to || strcmp(resolves_to, d->refname))
343 return 0;
344
Jay Soffian3cf61342009-11-10 05:03:32[diff] [blame]345 fprintf(d->fp, d->msg_fmt, refname);
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]346 return 0;
347}
348
Jay Soffian3cf61342009-11-10 05:03:32[diff] [blame]349void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]350{
Gary V. Vaughan66dbfd52010-05-14 09:31:33[diff] [blame]351 struct warn_if_dangling_data data;
352
353 data.fp = fp;
354 data.refname = refname;
355 data.msg_fmt = msg_fmt;
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]356 for_each_rawref(warn_if_dangling_symref, &data);
357}
358
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]359static struct ref_list *get_loose_refs(const char *submodule)
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]360{
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]361 if (submodule) {
362 free_ref_list(submodule_refs.loose);
363 submodule_refs.loose = get_ref_dir(submodule, "refs", NULL);
364 return submodule_refs.loose;
365 }
366
Junio C Hamano5e290ff2006-09-30 19:37:37[diff] [blame]367 if (!cached_refs.did_loose) {
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]368 cached_refs.loose = get_ref_dir(NULL, "refs", NULL);
Junio C Hamano5e290ff2006-09-30 19:37:37[diff] [blame]369 cached_refs.did_loose = 1;
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]370 }
Junio C Hamano5e290ff2006-09-30 19:37:37[diff] [blame]371 return cached_refs.loose;
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]372}
373
Linus Torvaldsca8db142005-09-25 16:59:37[diff] [blame]374/* We allow "recursive" symbolic refs. Only within reason, though */
375#define MAXDEPTH 5
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]376#define MAXREFLEN (1024)
377
378static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result)
379{
380 FILE *f;
381 struct cached_refs refs;
382 struct ref_list *ref;
383 int retval;
384
385 strcpy(name + pathlen, "packed-refs");
386 f = fopen(name, "r");
387 if (!f)
388 return -1;
389 read_packed_refs(f, &refs);
390 fclose(f);
391 ref = refs.packed;
392 retval = -1;
393 while (ref) {
394 if (!strcmp(ref->name, refname)) {
395 retval = 0;
396 memcpy(result, ref->sha1, 20);
397 break;
398 }
399 ref = ref->next;
400 }
401 free_ref_list(refs.packed);
402 return retval;
403}
404
405static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion)
406{
407 int fd, len = strlen(refname);
408 char buffer[128], *p;
409
410 if (recursion > MAXDEPTH || len > MAXREFLEN)
411 return -1;
412 memcpy(name + pathlen, refname, len+1);
413 fd = open(name, O_RDONLY);
414 if (fd < 0)
415 return resolve_gitlink_packed_ref(name, pathlen, refname, result);
416
417 len = read(fd, buffer, sizeof(buffer)-1);
418 close(fd);
419 if (len < 0)
420 return -1;
421 while (len && isspace(buffer[len-1]))
422 len--;
423 buffer[len] = 0;
424
425 /* Was it a detached head or an old-fashioned symlink? */
426 if (!get_sha1_hex(buffer, result))
427 return 0;
428
429 /* Symref? */
430 if (strncmp(buffer, "ref:", 4))
431 return -1;
432 p = buffer + 4;
433 while (isspace(*p))
434 p++;
435
436 return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1);
437}
438
439int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result)
440{
441 int len = strlen(path), retval;
442 char *gitdir;
Lars Hjemli842abf02008-02-20 22:13:14[diff] [blame]443 const char *tmp;
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]444
445 while (len && path[len-1] == '/')
446 len--;
447 if (!len)
448 return -1;
449 gitdir = xmalloc(len + MAXREFLEN + 8);
450 memcpy(gitdir, path, len);
Lars Hjemli842abf02008-02-20 22:13:14[diff] [blame]451 memcpy(gitdir + len, "/.git", 6);
452 len += 5;
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]453
Junio C Hamano13d6ec92011-08-22 21:04:56[diff] [blame]454 tmp = read_gitfile(gitdir);
Lars Hjemli842abf02008-02-20 22:13:14[diff] [blame]455 if (tmp) {
456 free(gitdir);
457 len = strlen(tmp);
458 gitdir = xmalloc(len + MAXREFLEN + 3);
459 memcpy(gitdir, tmp, len);
460 }
461 gitdir[len] = '/';
462 gitdir[++len] = '\0';
463 retval = resolve_gitlink_ref_recursive(gitdir, len, refname, result, 0);
Linus Torvalds0ebde322007-04-10 04:14:26[diff] [blame]464 free(gitdir);
465 return retval;
466}
Linus Torvaldsca8db142005-09-25 16:59:37[diff] [blame]467
Christian Couder4886b892008-09-09 05:10:56[diff] [blame]468/*
469 * If the "reading" argument is set, this function finds out what _object_
470 * the ref points at by "reading" the ref. The ref, if it is not symbolic,
471 * has to exist, and if it is symbolic, it has to point at an existing ref,
472 * because the "read" goes through the symref to the ref it points at.
473 *
474 * The access that is not "reading" may often be "writing", but does not
475 * have to; it can be merely checking _where it leads to_. If it is a
476 * prelude to "writing" to the ref, a write to a symref that points at
477 * yet-to-be-born ref will create the real ref pointed by the symref.
478 * reading=0 allows the caller to check where such a symref leads to.
479 */
Junio C Hamano8da19772006-09-21 05:02:01[diff] [blame]480const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag)
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]481{
Heikki Orsila0104ca02008-04-27 18:21:58[diff] [blame]482 int depth = MAXDEPTH;
483 ssize_t len;
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]484 char buffer[256];
Linus Torvaldsed378ec2006-09-12 03:17:35[diff] [blame]485 static char ref_buffer[256];
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]486
Junio C Hamano8da19772006-09-21 05:02:01[diff] [blame]487 if (flag)
488 *flag = 0;
489
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]490 for (;;) {
Alex Riesen958a4782008-10-27 10:11:40[diff] [blame]491 char path[PATH_MAX];
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]492 struct stat st;
493 char *buf;
494 int fd;
495
496 if (--depth < 0)
497 return NULL;
498
Alex Riesen958a4782008-10-27 10:11:40[diff] [blame]499 git_snpath(path, sizeof(path), "%s", ref);
Christian Couder4886b892008-09-09 05:10:56[diff] [blame]500 /* Special case: non-existing file. */
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]501 if (lstat(path, &st) < 0) {
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]502 struct ref_list *list = get_packed_refs(NULL);
Linus Torvalds434cd0c2006-09-14 17:14:47[diff] [blame]503 while (list) {
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]504 if (!strcmp(ref, list->name)) {
Linus Torvalds434cd0c2006-09-14 17:14:47[diff] [blame]505 hashcpy(sha1, list->sha1);
Junio C Hamano8da19772006-09-21 05:02:01[diff] [blame]506 if (flag)
507 *flag |= REF_ISPACKED;
Linus Torvalds434cd0c2006-09-14 17:14:47[diff] [blame]508 return ref;
509 }
510 list = list->next;
511 }
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]512 if (reading || errno != ENOENT)
513 return NULL;
Shawn Pearcee7024962006-08-23 06:49:00[diff] [blame]514 hashclr(sha1);
Linus Torvaldsed378ec2006-09-12 03:17:35[diff] [blame]515 return ref;
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]516 }
517
518 /* Follow "normalized" - ie "refs/.." symlinks by hand */
519 if (S_ISLNK(st.st_mode)) {
520 len = readlink(path, buffer, sizeof(buffer)-1);
521 if (len >= 5 && !memcmp("refs/", buffer, 5)) {
Linus Torvaldsed378ec2006-09-12 03:17:35[diff] [blame]522 buffer[len] = 0;
523 strcpy(ref_buffer, buffer);
524 ref = ref_buffer;
Junio C Hamano8da19772006-09-21 05:02:01[diff] [blame]525 if (flag)
526 *flag |= REF_ISSYMREF;
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]527 continue;
528 }
529 }
530
Dennis Stosberg7a216322006-10-02 17:23:53[diff] [blame]531 /* Is it a directory? */
532 if (S_ISDIR(st.st_mode)) {
533 errno = EISDIR;
534 return NULL;
535 }
536
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]537 /*
538 * Anything else, just open it and try to use it as
539 * a ref
540 */
541 fd = open(path, O_RDONLY);
542 if (fd < 0)
543 return NULL;
Andy Whitcroft93d26e42007-01-08 15:58:08[diff] [blame]544 len = read_in_full(fd, buffer, sizeof(buffer)-1);
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]545 close(fd);
546
547 /*
548 * Is it a symbolic ref?
549 */
550 if (len < 4 || memcmp("ref:", buffer, 4))
551 break;
552 buf = buffer + 4;
553 len -= 4;
554 while (len && isspace(*buf))
555 buf++, len--;
556 while (len && isspace(buf[len-1]))
Linus Torvaldsed378ec2006-09-12 03:17:35[diff] [blame]557 len--;
558 buf[len] = 0;
559 memcpy(ref_buffer, buf, len + 1);
560 ref = ref_buffer;
Junio C Hamano8da19772006-09-21 05:02:01[diff] [blame]561 if (flag)
562 *flag |= REF_ISSYMREF;
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]563 }
564 if (len < 40 || get_sha1_hex(buffer, sha1))
565 return NULL;
Linus Torvaldsed378ec2006-09-12 03:17:35[diff] [blame]566 return ref;
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]567}
568
Ilari Liusvaarad08bae72010-01-20 09:48:25[diff] [blame]569/* The argument to filter_refs */
570struct ref_filter {
571 const char *pattern;
572 each_ref_fn *fn;
573 void *cb_data;
574};
575
Linus Torvaldsed378ec2006-09-12 03:17:35[diff] [blame]576int read_ref(const char *ref, unsigned char *sha1)
Linus Torvalds8a65ff72005-07-03 03:23:36[diff] [blame]577{
Junio C Hamano8da19772006-09-21 05:02:01[diff] [blame]578 if (resolve_ref(ref, sha1, 1, NULL))
Junio C Hamanoa876ed82005-09-30 21:08:25[diff] [blame]579 return 0;
580 return -1;
Linus Torvalds8a65ff72005-07-03 03:23:36[diff] [blame]581}
582
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]583#define DO_FOR_EACH_INCLUDE_BROKEN 01
Junio C Hamanoef06b912006-11-19 06:13:33[diff] [blame]584static int do_one_ref(const char *base, each_ref_fn fn, int trim,
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]585 int flags, void *cb_data, struct ref_list *entry)
Junio C Hamanoef06b912006-11-19 06:13:33[diff] [blame]586{
Josh Triplettb3cfc402011-07-05 17:54:21[diff] [blame]587 if (prefixcmp(entry->name, base))
Junio C Hamanoef06b912006-11-19 06:13:33[diff] [blame]588 return 0;
Junio C Hamanoe01de1c2010-03-16 05:12:55[diff] [blame]589
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]590 if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) {
Junio C Hamanoe01de1c2010-03-16 05:12:55[diff] [blame]591 if (entry->flag & REF_BROKEN)
592 return 0; /* ignore dangling symref */
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]593 if (!has_sha1_file(entry->sha1)) {
594 error("%s does not point to a valid object!", entry->name);
595 return 0;
596 }
Junio C Hamanoef06b912006-11-19 06:13:33[diff] [blame]597 }
Shawn O. Pearce0ae91be2008-02-24 08:07:22[diff] [blame]598 current_ref = entry;
Junio C Hamanoef06b912006-11-19 06:13:33[diff] [blame]599 return fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
600}
601
Ilari Liusvaarad08bae72010-01-20 09:48:25[diff] [blame]602static int filter_refs(const char *ref, const unsigned char *sha, int flags,
603 void *data)
604{
605 struct ref_filter *filter = (struct ref_filter *)data;
606 if (fnmatch(filter->pattern, ref, 0))
607 return 0;
608 return filter->fn(ref, sha, flags, filter->cb_data);
609}
610
Junio C Hamanocf0adba2006-11-19 21:22:44[diff] [blame]611int peel_ref(const char *ref, unsigned char *sha1)
612{
613 int flag;
614 unsigned char base[20];
615 struct object *o;
616
Shawn O. Pearce0ae91be2008-02-24 08:07:22[diff] [blame]617 if (current_ref && (current_ref->name == ref
618 || !strcmp(current_ref->name, ref))) {
619 if (current_ref->flag & REF_KNOWS_PEELED) {
620 hashcpy(sha1, current_ref->peeled);
621 return 0;
622 }
623 hashcpy(base, current_ref->sha1);
624 goto fallback;
625 }
626
Junio C Hamanocf0adba2006-11-19 21:22:44[diff] [blame]627 if (!resolve_ref(ref, base, 1, &flag))
628 return -1;
629
630 if ((flag & REF_ISPACKED)) {
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]631 struct ref_list *list = get_packed_refs(NULL);
Junio C Hamanocf0adba2006-11-19 21:22:44[diff] [blame]632
633 while (list) {
Junio C Hamanof4204ab2006-11-22 07:36:35[diff] [blame]634 if (!strcmp(list->name, ref)) {
635 if (list->flag & REF_KNOWS_PEELED) {
636 hashcpy(sha1, list->peeled);
637 return 0;
638 }
639 /* older pack-refs did not leave peeled ones */
640 break;
Junio C Hamanocf0adba2006-11-19 21:22:44[diff] [blame]641 }
642 list = list->next;
643 }
Junio C Hamanocf0adba2006-11-19 21:22:44[diff] [blame]644 }
645
Shawn O. Pearce0ae91be2008-02-24 08:07:22[diff] [blame]646fallback:
Junio C Hamanocf0adba2006-11-19 21:22:44[diff] [blame]647 o = parse_object(base);
Shawn O. Pearce8c87dc72008-02-24 08:07:19[diff] [blame]648 if (o && o->type == OBJ_TAG) {
Junio C Hamanocf0adba2006-11-19 21:22:44[diff] [blame]649 o = deref_tag(o, ref, 0);
650 if (o) {
651 hashcpy(sha1, o->sha1);
652 return 0;
653 }
654 }
655 return -1;
656}
657
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]658static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn,
659 int trim, int flags, void *cb_data)
Linus Torvalds8a65ff72005-07-03 03:23:36[diff] [blame]660{
Shawn O. Pearce0ae91be2008-02-24 08:07:22[diff] [blame]661 int retval = 0;
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]662 struct ref_list *packed = get_packed_refs(submodule);
663 struct ref_list *loose = get_loose_refs(submodule);
Linus Torvalds8a65ff72005-07-03 03:23:36[diff] [blame]664
Daniel Barkalowe142a3c2008-04-27 17:39:24[diff] [blame]665 struct ref_list *extra;
666
667 for (extra = extra_refs; extra; extra = extra->next)
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]668 retval = do_one_ref(base, fn, trim, flags, cb_data, extra);
Daniel Barkalowe142a3c2008-04-27 17:39:24[diff] [blame]669
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]670 while (packed && loose) {
671 struct ref_list *entry;
672 int cmp = strcmp(packed->name, loose->name);
673 if (!cmp) {
674 packed = packed->next;
675 continue;
Linus Torvalds6cada6a2005-07-04 22:28:19[diff] [blame]676 }
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]677 if (cmp > 0) {
678 entry = loose;
679 loose = loose->next;
680 } else {
681 entry = packed;
682 packed = packed->next;
Linus Torvalds8a65ff72005-07-03 03:23:36[diff] [blame]683 }
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]684 retval = do_one_ref(base, fn, trim, flags, cb_data, entry);
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]685 if (retval)
Shawn O. Pearce0ae91be2008-02-24 08:07:22[diff] [blame]686 goto end_each;
Linus Torvalds8a65ff72005-07-03 03:23:36[diff] [blame]687 }
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]688
Junio C Hamanoef06b912006-11-19 06:13:33[diff] [blame]689 for (packed = packed ? packed : loose; packed; packed = packed->next) {
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]690 retval = do_one_ref(base, fn, trim, flags, cb_data, packed);
Junio C Hamanoef06b912006-11-19 06:13:33[diff] [blame]691 if (retval)
Shawn O. Pearce0ae91be2008-02-24 08:07:22[diff] [blame]692 goto end_each;
Linus Torvaldse1e22e32006-09-11 23:37:32[diff] [blame]693 }
Shawn O. Pearce0ae91be2008-02-24 08:07:22[diff] [blame]694
695end_each:
696 current_ref = NULL;
697 return retval;
Linus Torvalds8a65ff72005-07-03 03:23:36[diff] [blame]698}
699
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]700
701static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data)
Linus Torvalds723c31f2005-07-05 18:31:32[diff] [blame]702{
703 unsigned char sha1[20];
Junio C Hamano8da19772006-09-21 05:02:01[diff] [blame]704 int flag;
705
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]706 if (submodule) {
707 if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0)
708 return fn("HEAD", sha1, 0, cb_data);
709
710 return 0;
711 }
712
Junio C Hamano8da19772006-09-21 05:02:01[diff] [blame]713 if (resolve_ref("HEAD", sha1, 1, &flag))
714 return fn("HEAD", sha1, flag, cb_data);
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]715
Linus Torvalds2f34ba32005-07-05 22:45:00[diff] [blame]716 return 0;
Linus Torvalds723c31f2005-07-05 18:31:32[diff] [blame]717}
718
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]719int head_ref(each_ref_fn fn, void *cb_data)
720{
721 return do_head_ref(NULL, fn, cb_data);
722}
723
Heiko Voigt9ef6aeb2010-07-07 13:39:12[diff] [blame]724int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
725{
726 return do_head_ref(submodule, fn, cb_data);
727}
728
Junio C Hamanocb5d7092006-09-21 04:47:42[diff] [blame]729int for_each_ref(each_ref_fn fn, void *cb_data)
Linus Torvalds8a65ff72005-07-03 03:23:36[diff] [blame]730{
Josh Triplettb3cfc402011-07-05 17:54:21[diff] [blame]731 return do_for_each_ref(NULL, "", fn, 0, 0, cb_data);
Seana62be772006-05-14 01:43:00[diff] [blame]732}
733
Heiko Voigt9ef6aeb2010-07-07 13:39:12[diff] [blame]734int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
735{
Josh Triplettb3cfc402011-07-05 17:54:21[diff] [blame]736 return do_for_each_ref(submodule, "", fn, 0, 0, cb_data);
Seana62be772006-05-14 01:43:00[diff] [blame]737}
738
Christian Couder2a8177b2009-03-30 03:07:15[diff] [blame]739int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
740{
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]741 return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data);
Christian Couder2a8177b2009-03-30 03:07:15[diff] [blame]742}
743
Heiko Voigt9ef6aeb2010-07-07 13:39:12[diff] [blame]744int for_each_ref_in_submodule(const char *submodule, const char *prefix,
745 each_ref_fn fn, void *cb_data)
746{
747 return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data);
Christian Couder2a8177b2009-03-30 03:07:15[diff] [blame]748}
749
Junio C Hamanocb5d7092006-09-21 04:47:42[diff] [blame]750int for_each_tag_ref(each_ref_fn fn, void *cb_data)
Seana62be772006-05-14 01:43:00[diff] [blame]751{
Christian Couder2a8177b2009-03-30 03:07:15[diff] [blame]752 return for_each_ref_in("refs/tags/", fn, cb_data);
Seana62be772006-05-14 01:43:00[diff] [blame]753}
754
Heiko Voigt9ef6aeb2010-07-07 13:39:12[diff] [blame]755int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
756{
757 return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data);
758}
759
Junio C Hamanocb5d7092006-09-21 04:47:42[diff] [blame]760int for_each_branch_ref(each_ref_fn fn, void *cb_data)
Seana62be772006-05-14 01:43:00[diff] [blame]761{
Christian Couder2a8177b2009-03-30 03:07:15[diff] [blame]762 return for_each_ref_in("refs/heads/", fn, cb_data);
Seana62be772006-05-14 01:43:00[diff] [blame]763}
764
Heiko Voigt9ef6aeb2010-07-07 13:39:12[diff] [blame]765int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
766{
767 return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data);
768}
769
Junio C Hamanocb5d7092006-09-21 04:47:42[diff] [blame]770int for_each_remote_ref(each_ref_fn fn, void *cb_data)
Seana62be772006-05-14 01:43:00[diff] [blame]771{
Christian Couder2a8177b2009-03-30 03:07:15[diff] [blame]772 return for_each_ref_in("refs/remotes/", fn, cb_data);
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]773}
774
Heiko Voigt9ef6aeb2010-07-07 13:39:12[diff] [blame]775int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
776{
777 return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data);
778}
779
Christian Couder29268702009-01-23 09:06:38[diff] [blame]780int for_each_replace_ref(each_ref_fn fn, void *cb_data)
781{
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]782 return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data);
Christian Couder29268702009-01-23 09:06:38[diff] [blame]783}
784
Josh Tripletta1bea2c2011-07-05 17:54:44[diff] [blame]785int head_ref_namespaced(each_ref_fn fn, void *cb_data)
786{
787 struct strbuf buf = STRBUF_INIT;
788 int ret = 0;
789 unsigned char sha1[20];
790 int flag;
791
792 strbuf_addf(&buf, "%sHEAD", get_git_namespace());
793 if (resolve_ref(buf.buf, sha1, 1, &flag))
794 ret = fn(buf.buf, sha1, flag, cb_data);
795 strbuf_release(&buf);
796
797 return ret;
798}
799
800int for_each_namespaced_ref(each_ref_fn fn, void *cb_data)
801{
802 struct strbuf buf = STRBUF_INIT;
803 int ret;
804 strbuf_addf(&buf, "%srefs/", get_git_namespace());
805 ret = do_for_each_ref(NULL, buf.buf, fn, 0, 0, cb_data);
806 strbuf_release(&buf);
807 return ret;
808}
809
Ilari Liusvaarab09fe972010-01-20 09:48:26[diff] [blame]810int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
811 const char *prefix, void *cb_data)
Ilari Liusvaarad08bae72010-01-20 09:48:25[diff] [blame]812{
813 struct strbuf real_pattern = STRBUF_INIT;
814 struct ref_filter filter;
Ilari Liusvaarad08bae72010-01-20 09:48:25[diff] [blame]815 int ret;
816
Ilari Liusvaarab09fe972010-01-20 09:48:26[diff] [blame]817 if (!prefix && prefixcmp(pattern, "refs/"))
Ilari Liusvaarad08bae72010-01-20 09:48:25[diff] [blame]818 strbuf_addstr(&real_pattern, "refs/");
Ilari Liusvaarab09fe972010-01-20 09:48:26[diff] [blame]819 else if (prefix)
820 strbuf_addstr(&real_pattern, prefix);
Ilari Liusvaarad08bae72010-01-20 09:48:25[diff] [blame]821 strbuf_addstr(&real_pattern, pattern);
822
Thomas Rast894a9d32010-03-12 17:04:26[diff] [blame]823 if (!has_glob_specials(pattern)) {
Junio C Hamano9517e6b2010-02-04 05:23:18[diff] [blame]824 /* Append implied '/' '*' if not present. */
Ilari Liusvaarad08bae72010-01-20 09:48:25[diff] [blame]825 if (real_pattern.buf[real_pattern.len - 1] != '/')
826 strbuf_addch(&real_pattern, '/');
827 /* No need to check for '*', there is none. */
828 strbuf_addch(&real_pattern, '*');
829 }
830
831 filter.pattern = real_pattern.buf;
832 filter.fn = fn;
833 filter.cb_data = cb_data;
834 ret = for_each_ref(filter_refs, &filter);
835
836 strbuf_release(&real_pattern);
837 return ret;
838}
839
Ilari Liusvaarab09fe972010-01-20 09:48:26[diff] [blame]840int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data)
841{
842 return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
843}
844
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]845int for_each_rawref(each_ref_fn fn, void *cb_data)
846{
Josh Triplettb3cfc402011-07-05 17:54:21[diff] [blame]847 return do_for_each_ref(NULL, "", fn, 0,
Junio C Hamanof8948e22009-02-09 07:27:10[diff] [blame]848 DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
Linus Torvalds8a65ff72005-07-03 03:23:36[diff] [blame]849}
850
Junio C Hamano03feddd2005-10-14 01:57:39[diff] [blame]851/*
852 * Make sure "ref" is something reasonable to have under ".git/refs/";
853 * We do not like it if:
854 *
855 * - any path component of it begins with ".", or
856 * - it has double dots "..", or
857 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
858 * - it ends with a "/".
Shawn O. Pearce3e262b92009-03-24 23:31:01[diff] [blame]859 * - it ends with ".lock"
Robin Rosenberga4c2e692009-05-08 05:32:37[diff] [blame]860 * - it contains a "\" (backslash)
Junio C Hamano03feddd2005-10-14 01:57:39[diff] [blame]861 */
862
863static inline int bad_ref_char(int ch)
864{
Michael Haggertyf3738c12011-08-27 04:12:44[diff] [blame]865 if (((unsigned) ch) <= ' ' || ch == 0x7f ||
Robin Rosenberga4c2e692009-05-08 05:32:37[diff] [blame]866 ch == '~' || ch == '^' || ch == ':' || ch == '\\')
Daniel Barkalow8558fd92007-05-25 05:20:56[diff] [blame]867 return 1;
868 /* 2.13 Pattern Matching Notation */
869 if (ch == '?' || ch == '[') /* Unsupported */
870 return 1;
871 if (ch == '*') /* Supported at the end */
872 return 2;
873 return 0;
Junio C Hamano03feddd2005-10-14 01:57:39[diff] [blame]874}
875
Daniel Barkalow95fc7512005-06-06 20:31:29[diff] [blame]876int check_ref_format(const char *ref)
877{
Junio C Hamanocbdffe42009-03-21 20:27:31[diff] [blame]878 int ch, level, bad_type, last;
Daniel Barkalowabd2bde2009-03-07 06:11:39[diff] [blame]879 int ret = CHECK_REF_FORMAT_OK;
Junio C Hamano03feddd2005-10-14 01:57:39[diff] [blame]880 const char *cp = ref;
881
882 level = 0;
883 while (1) {
884 while ((ch = *cp++) == '/')
885 ; /* tolerate duplicated slashes */
886 if (!ch)
Junio C Hamano5f7b2022008-01-02 06:33:20[diff] [blame]887 /* should not end with slashes */
888 return CHECK_REF_FORMAT_ERROR;
Junio C Hamano03feddd2005-10-14 01:57:39[diff] [blame]889
890 /* we are at the beginning of the path component */
Daniel Barkalow8558fd92007-05-25 05:20:56[diff] [blame]891 if (ch == '.')
Junio C Hamano5f7b2022008-01-02 06:33:20[diff] [blame]892 return CHECK_REF_FORMAT_ERROR;
Daniel Barkalow8558fd92007-05-25 05:20:56[diff] [blame]893 bad_type = bad_ref_char(ch);
894 if (bad_type) {
Daniel Barkalowabd2bde2009-03-07 06:11:39[diff] [blame]895 if (bad_type == 2 && (!*cp || *cp == '/') &&
896 ret == CHECK_REF_FORMAT_OK)
897 ret = CHECK_REF_FORMAT_WILDCARD;
898 else
899 return CHECK_REF_FORMAT_ERROR;
Daniel Barkalow8558fd92007-05-25 05:20:56[diff] [blame]900 }
Junio C Hamano03feddd2005-10-14 01:57:39[diff] [blame]901
Junio C Hamanocbdffe42009-03-21 20:27:31[diff] [blame]902 last = ch;
Junio C Hamano03feddd2005-10-14 01:57:39[diff] [blame]903 /* scan the rest of the path component */
904 while ((ch = *cp++) != 0) {
Daniel Barkalow8558fd92007-05-25 05:20:56[diff] [blame]905 bad_type = bad_ref_char(ch);
Junio C Hamanocbdffe42009-03-21 20:27:31[diff] [blame]906 if (bad_type)
Daniel Barkalow08fbdb32009-03-07 06:11:36[diff] [blame]907 return CHECK_REF_FORMAT_ERROR;
Junio C Hamano03feddd2005-10-14 01:57:39[diff] [blame]908 if (ch == '/')
909 break;
Junio C Hamanocbdffe42009-03-21 20:27:31[diff] [blame]910 if (last == '.' && ch == '.')
Junio C Hamano5f7b2022008-01-02 06:33:20[diff] [blame]911 return CHECK_REF_FORMAT_ERROR;
Junio C Hamanocbdffe42009-03-21 20:27:31[diff] [blame]912 if (last == '@' && ch == '{')
913 return CHECK_REF_FORMAT_ERROR;
914 last = ch;
Junio C Hamano03feddd2005-10-14 01:57:39[diff] [blame]915 }
916 level++;
917 if (!ch) {
Junio C Hamanocbdffe42009-03-21 20:27:31[diff] [blame]918 if (ref <= cp - 2 && cp[-2] == '.')
919 return CHECK_REF_FORMAT_ERROR;
Junio C Hamano03feddd2005-10-14 01:57:39[diff] [blame]920 if (level < 2)
Junio C Hamano5f7b2022008-01-02 06:33:20[diff] [blame]921 return CHECK_REF_FORMAT_ONELEVEL;
Shawn O. Pearce3e262b92009-03-24 23:31:01[diff] [blame]922 if (has_extension(ref, ".lock"))
923 return CHECK_REF_FORMAT_ERROR;
Daniel Barkalowabd2bde2009-03-07 06:11:39[diff] [blame]924 return ret;
Junio C Hamano03feddd2005-10-14 01:57:39[diff] [blame]925 }
926 }
Daniel Barkalow95fc7512005-06-06 20:31:29[diff] [blame]927}
928
Felipe Contreras4577e482009-05-13 21:22:04[diff] [blame]929const char *prettify_refname(const char *name)
Daniel Barkalowa9c37a72009-03-09 01:06:05[diff] [blame]930{
Daniel Barkalowa9c37a72009-03-09 01:06:05[diff] [blame]931 return name + (
932 !prefixcmp(name, "refs/heads/") ? 11 :
933 !prefixcmp(name, "refs/tags/") ? 10 :
934 !prefixcmp(name, "refs/remotes/") ? 13 :
935 0);
936}
937
Steffen Prohaska79803322007-11-11 14:01:46[diff] [blame]938const char *ref_rev_parse_rules[] = {
939 "%.*s",
940 "refs/%.*s",
941 "refs/tags/%.*s",
942 "refs/heads/%.*s",
943 "refs/remotes/%.*s",
944 "refs/remotes/%.*s/HEAD",
945 NULL
946};
947
Steffen Prohaska605b4972007-11-11 14:01:48[diff] [blame]948const char *ref_fetch_rules[] = {
949 "%.*s",
950 "refs/%.*s",
951 "refs/heads/%.*s",
952 NULL
953};
954
Steffen Prohaska79803322007-11-11 14:01:46[diff] [blame]955int refname_match(const char *abbrev_name, const char *full_name, const char **rules)
956{
957 const char **p;
958 const int abbrev_name_len = strlen(abbrev_name);
959
960 for (p = rules; *p; p++) {
961 if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
962 return 1;
963 }
964 }
965
966 return 0;
967}
968
Junio C Hamanoe5f38ec2006-06-06 21:04:17[diff] [blame]969static struct ref_lock *verify_lock(struct ref_lock *lock,
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]970 const unsigned char *old_sha1, int mustexist)
Daniel Barkalow95fc7512005-06-06 20:31:29[diff] [blame]971{
Junio C Hamano8da19772006-09-21 05:02:01[diff] [blame]972 if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
Linus Torvalds434cd0c2006-09-14 17:14:47[diff] [blame]973 error("Can't verify ref %s", lock->ref_name);
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]974 unlock_ref(lock);
975 return NULL;
976 }
David Rientjesa89fccd2006-08-17 18:54:57[diff] [blame]977 if (hashcmp(lock->old_sha1, old_sha1)) {
Linus Torvalds434cd0c2006-09-14 17:14:47[diff] [blame]978 error("Ref %s is at %s but expected %s", lock->ref_name,
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]979 sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
980 unlock_ref(lock);
981 return NULL;
982 }
983 return lock;
984}
985
Johannes Schindelin7155b722007-09-28 15:28:54[diff] [blame]986static int remove_empty_directories(const char *file)
Junio C Hamanobc7127e2006-09-30 09:25:30[diff] [blame]987{
988 /* we want to create a file but there is a directory there;
989 * if that is an empty directory (or a directory that contains
990 * only empty directories), remove them.
991 */
Johannes Schindelin7155b722007-09-28 15:28:54[diff] [blame]992 struct strbuf path;
993 int result;
Junio C Hamanobc7127e2006-09-30 09:25:30[diff] [blame]994
Johannes Schindelin7155b722007-09-28 15:28:54[diff] [blame]995 strbuf_init(&path, 20);
996 strbuf_addstr(&path, file);
997
Junio C Hamanoa0f4afb2009-06-30 22:33:45[diff] [blame]998 result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY);
Johannes Schindelin7155b722007-09-28 15:28:54[diff] [blame]999
1000 strbuf_release(&path);
1001
1002 return result;
Junio C Hamanobc7127e2006-09-30 09:25:30[diff] [blame]1003}
1004
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1005static int is_refname_available(const char *ref, const char *oldref,
1006 struct ref_list *list, int quiet)
1007{
1008 int namlen = strlen(ref); /* e.g. 'foo/bar' */
1009 while (list) {
1010 /* list->name could be 'foo' or 'foo/bar/baz' */
1011 if (!oldref || strcmp(oldref, list->name)) {
1012 int len = strlen(list->name);
1013 int cmplen = (namlen < len) ? namlen : len;
1014 const char *lead = (namlen < len) ? list->name : ref;
1015 if (!strncmp(ref, list->name, cmplen) &&
1016 lead[cmplen] == '/') {
1017 if (!quiet)
1018 error("'%s' exists; cannot create '%s'",
1019 list->name, ref);
1020 return 0;
1021 }
1022 }
1023 list = list->next;
1024 }
1025 return 1;
1026}
1027
Sven Verdoolaege68db31c2007-05-09 10:33:20[diff] [blame]1028static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p)
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1029{
Linus Torvalds434cd0c2006-09-14 17:14:47[diff] [blame]1030 char *ref_file;
Linus Torvaldsed378ec2006-09-12 03:17:35[diff] [blame]1031 const char *orig_ref = ref;
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1032 struct ref_lock *lock;
Junio C Hamano5cc3cef2006-09-30 21:14:31[diff] [blame]1033 int last_errno = 0;
Junio C Hamanoacd3b9e2008-10-17 22:44:39[diff] [blame]1034 int type, lflags;
Junio C Hamano4431fcc2006-09-27 08:09:18[diff] [blame]1035 int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
Clemens Buchacher5bdd8d42008-11-05 20:55:53[diff] [blame]1036 int missing = 0;
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1037
1038 lock = xcalloc(1, sizeof(struct ref_lock));
1039 lock->lock_fd = -1;
1040
Sven Verdoolaege68db31c2007-05-09 10:33:20[diff] [blame]1041 ref = resolve_ref(ref, lock->old_sha1, mustexist, &type);
Junio C Hamanobc7127e2006-09-30 09:25:30[diff] [blame]1042 if (!ref && errno == EISDIR) {
1043 /* we are trying to lock foo but we used to
1044 * have foo/bar which now does not exist;
1045 * it is normal for the empty directory 'foo'
1046 * to remain.
1047 */
1048 ref_file = git_path("%s", orig_ref);
Junio C Hamano5cc3cef2006-09-30 21:14:31[diff] [blame]1049 if (remove_empty_directories(ref_file)) {
1050 last_errno = errno;
1051 error("there are still refs under '%s'", orig_ref);
1052 goto error_return;
1053 }
Sven Verdoolaege68db31c2007-05-09 10:33:20[diff] [blame]1054 ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type);
Junio C Hamanobc7127e2006-09-30 09:25:30[diff] [blame]1055 }
Sven Verdoolaege68db31c2007-05-09 10:33:20[diff] [blame]1056 if (type_p)
1057 *type_p = type;
Linus Torvaldsed378ec2006-09-12 03:17:35[diff] [blame]1058 if (!ref) {
Junio C Hamano5cc3cef2006-09-30 21:14:31[diff] [blame]1059 last_errno = errno;
Shawn Pearce818f4772006-07-29 03:44:51[diff] [blame]1060 error("unable to resolve reference %s: %s",
Linus Torvaldsed378ec2006-09-12 03:17:35[diff] [blame]1061 orig_ref, strerror(errno));
Junio C Hamano5cc3cef2006-09-30 21:14:31[diff] [blame]1062 goto error_return;
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1063 }
Clemens Buchacher5bdd8d42008-11-05 20:55:53[diff] [blame]1064 missing = is_null_sha1(lock->old_sha1);
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1065 /* When the ref did not exist and we are creating it,
1066 * make sure there is no existing ref that is packed
1067 * whose name begins with our refname, nor a ref whose
1068 * name is a proper prefix of our refname.
1069 */
Clemens Buchacher5bdd8d42008-11-05 20:55:53[diff] [blame]1070 if (missing &&
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]1071 !is_refname_available(ref, NULL, get_packed_refs(NULL), 0)) {
Jeff Kingf475e082009-05-25 10:37:15[diff] [blame]1072 last_errno = ENOTDIR;
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1073 goto error_return;
Jeff Kingf475e082009-05-25 10:37:15[diff] [blame]1074 }
Junio C Hamano22a38442006-09-30 21:19:25[diff] [blame]1075
Junio C Hamanoc33d5172006-06-06 20:54:14[diff] [blame]1076 lock->lk = xcalloc(1, sizeof(struct lock_file));
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1077
Junio C Hamanoacd3b9e2008-10-17 22:44:39[diff] [blame]1078 lflags = LOCK_DIE_ON_ERROR;
1079 if (flags & REF_NODEREF) {
Sven Verdoolaege68db31c2007-05-09 10:33:20[diff] [blame]1080 ref = orig_ref;
Junio C Hamanoacd3b9e2008-10-17 22:44:39[diff] [blame]1081 lflags |= LOCK_NODEREF;
1082 }
Linus Torvalds434cd0c2006-09-14 17:14:47[diff] [blame]1083 lock->ref_name = xstrdup(ref);
Nicolas Pitre16557072007-01-26 22:26:06[diff] [blame]1084 lock->orig_ref_name = xstrdup(orig_ref);
Petr Baudis7c1a2782006-09-22 23:08:45[diff] [blame]1085 ref_file = git_path("%s", ref);
Clemens Buchacher5bdd8d42008-11-05 20:55:53[diff] [blame]1086 if (missing)
Sven Verdoolaege68db31c2007-05-09 10:33:20[diff] [blame]1087 lock->force_write = 1;
1088 if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
1089 lock->force_write = 1;
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1090
Junio C Hamano5cc3cef2006-09-30 21:14:31[diff] [blame]1091 if (safe_create_leading_directories(ref_file)) {
1092 last_errno = errno;
1093 error("unable to create directory for %s", ref_file);
1094 goto error_return;
1095 }
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1096
Junio C Hamanoacd3b9e2008-10-17 22:44:39[diff] [blame]1097 lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags);
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1098 return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
Junio C Hamano5cc3cef2006-09-30 21:14:31[diff] [blame]1099
1100 error_return:
1101 unlock_ref(lock);
1102 errno = last_errno;
1103 return NULL;
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1104}
1105
Junio C Hamano4431fcc2006-09-27 08:09:18[diff] [blame]1106struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1)
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1107{
Petr Baudis53cce842006-09-19 20:58:23[diff] [blame]1108 char refpath[PATH_MAX];
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1109 if (check_ref_format(ref))
1110 return NULL;
Petr Baudis53cce842006-09-19 20:58:23[diff] [blame]1111 strcpy(refpath, mkpath("refs/%s", ref));
Sven Verdoolaege68db31c2007-05-09 10:33:20[diff] [blame]1112 return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1113}
1114
Sven Verdoolaege68db31c2007-05-09 10:33:20[diff] [blame]1115struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags)
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1116{
Junio C Hamano5f7b2022008-01-02 06:33:20[diff] [blame]1117 switch (check_ref_format(ref)) {
Junio C Hamano5f7b2022008-01-02 06:33:20[diff] [blame]1118 default:
Junio C Hamano257f3022008-01-02 19:14:40[diff] [blame]1119 return NULL;
1120 case 0:
1121 case CHECK_REF_FORMAT_ONELEVEL:
Junio C Hamano5f7b2022008-01-02 06:33:20[diff] [blame]1122 return lock_ref_sha1_basic(ref, old_sha1, flags, NULL);
1123 }
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]1124}
1125
Junio C Hamano26a063a2006-10-01 18:41:00[diff] [blame]1126static struct lock_file packlock;
1127
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]1128static int repack_without_ref(const char *refname)
1129{
1130 struct ref_list *list, *packed_ref_list;
1131 int fd;
1132 int found = 0;
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]1133
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]1134 packed_ref_list = get_packed_refs(NULL);
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]1135 for (list = packed_ref_list; list; list = list->next) {
1136 if (!strcmp(refname, list->name)) {
1137 found = 1;
1138 break;
1139 }
1140 }
1141 if (!found)
1142 return 0;
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]1143 fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
Miklos Vajna1b018fd2009-09-26 23:15:09[diff] [blame]1144 if (fd < 0) {
1145 unable_to_lock_error(git_path("packed-refs"), errno);
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]1146 return error("cannot delete '%s' from packed refs", refname);
Miklos Vajna1b018fd2009-09-26 23:15:09[diff] [blame]1147 }
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]1148
1149 for (list = packed_ref_list; list; list = list->next) {
1150 char line[PATH_MAX + 100];
1151 int len;
1152
1153 if (!strcmp(refname, list->name))
1154 continue;
1155 len = snprintf(line, sizeof(line), "%s %s\n",
1156 sha1_to_hex(list->sha1), list->name);
1157 /* this should not happen but just being defensive */
1158 if (len > sizeof(line))
1159 die("too long a refname '%s'", list->name);
1160 write_or_die(fd, line, len);
1161 }
1162 return commit_lock_file(&packlock);
1163}
1164
Miklos Vajnaeca35a22008-10-26 02:33:56[diff] [blame]1165int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]1166{
1167 struct ref_lock *lock;
Miklos Vajnaeca35a22008-10-26 02:33:56[diff] [blame]1168 int err, i = 0, ret = 0, flag = 0;
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]1169
Sven Verdoolaege68db31c2007-05-09 10:33:20[diff] [blame]1170 lock = lock_ref_sha1_basic(refname, sha1, 0, &flag);
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]1171 if (!lock)
1172 return 1;
Miklos Vajna045a4762008-10-31 23:25:44[diff] [blame]1173 if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]1174 /* loose */
Miklos Vajnaeca35a22008-10-26 02:33:56[diff] [blame]1175 const char *path;
1176
1177 if (!(delopt & REF_NODEREF)) {
1178 i = strlen(lock->lk->filename) - 5; /* .lock */
1179 lock->lk->filename[i] = 0;
1180 path = lock->lk->filename;
1181 } else {
Daniel Lowe9db56f72008-11-10 21:07:52[diff] [blame]1182 path = git_path("%s", refname);
Miklos Vajnaeca35a22008-10-26 02:33:56[diff] [blame]1183 }
Alex Riesen691f1a22009-04-29 21:22:56[diff] [blame]1184 err = unlink_or_warn(path);
1185 if (err && errno != ENOENT)
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]1186 ret = 1;
Alex Riesen691f1a22009-04-29 21:22:56[diff] [blame]1187
Miklos Vajnaeca35a22008-10-26 02:33:56[diff] [blame]1188 if (!(delopt & REF_NODEREF))
1189 lock->lk->filename[i] = '.';
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]1190 }
1191 /* removing the loose one could have resurrected an earlier
1192 * packed one. Also, if it was not loose we need to repack
1193 * without it.
1194 */
1195 ret |= repack_without_ref(refname);
1196
Alex Riesen691f1a22009-04-29 21:22:56[diff] [blame]1197 unlink_or_warn(git_path("logs/%s", lock->ref_name));
Junio C Hamanoc0277d12006-09-30 22:02:00[diff] [blame]1198 invalidate_cached_refs();
1199 unlock_ref(lock);
1200 return ret;
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1201}
1202
Pierre Habouzit765c2252010-07-07 07:47:20[diff] [blame]1203/*
1204 * People using contrib's git-new-workdir have .git/logs/refs ->
1205 * /some/other/path/.git/logs/refs, and that may live on another device.
1206 *
1207 * IOW, to avoid cross device rename errors, the temporary renamed log must
1208 * live into logs/refs.
1209 */
1210#define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1211
Lars Hjemli678d0f42006-11-30 02:16:56[diff] [blame]1212int rename_ref(const char *oldref, const char *newref, const char *logmsg)
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1213{
1214 static const char renamed_ref[] = "RENAMED-REF";
1215 unsigned char sha1[20], orig_sha1[20];
1216 int flag = 0, logmoved = 0;
1217 struct ref_lock *lock;
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1218 struct stat loginfo;
Lars Hjemli16c2bfb2006-11-29 20:44:56[diff] [blame]1219 int log = !lstat(git_path("logs/%s", oldref), &loginfo);
Miklos Vajnaeca35a22008-10-26 02:33:56[diff] [blame]1220 const char *symref = NULL;
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1221
Miklos Vajna450d4c02008-10-26 02:33:57[diff] [blame]1222 if (log && S_ISLNK(loginfo.st_mode))
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1223 return error("reflog for %s is a symlink", oldref);
1224
Miklos Vajnaeca35a22008-10-26 02:33:56[diff] [blame]1225 symref = resolve_ref(oldref, orig_sha1, 1, &flag);
1226 if (flag & REF_ISSYMREF)
Miklos Vajnafa58186c2008-10-29 00:05:27[diff] [blame]1227 return error("refname %s is a symbolic ref, renaming it is not supported",
1228 oldref);
Miklos Vajnaeca35a22008-10-26 02:33:56[diff] [blame]1229 if (!symref)
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1230 return error("refname %s not found", oldref);
1231
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]1232 if (!is_refname_available(newref, oldref, get_packed_refs(NULL), 0))
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1233 return 1;
1234
Heiko Voigt0bad6112010-07-07 13:39:11[diff] [blame]1235 if (!is_refname_available(newref, oldref, get_loose_refs(NULL), 0))
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1236 return 1;
1237
Sven Verdoolaege68db31c2007-05-09 10:33:20[diff] [blame]1238 lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL);
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1239 if (!lock)
1240 return error("unable to lock %s", renamed_ref);
1241 lock->force_write = 1;
Lars Hjemli678d0f42006-11-30 02:16:56[diff] [blame]1242 if (write_ref_sha1(lock, orig_sha1, logmsg))
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1243 return error("unable to save current sha1 in %s", renamed_ref);
1244
Pierre Habouzit765c2252010-07-07 07:47:20[diff] [blame]1245 if (log && rename(git_path("logs/%s", oldref), git_path(TMP_RENAMED_LOG)))
1246 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1247 oldref, strerror(errno));
1248
Miklos Vajnaeca35a22008-10-26 02:33:56[diff] [blame]1249 if (delete_ref(oldref, orig_sha1, REF_NODEREF)) {
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1250 error("unable to delete old %s", oldref);
1251 goto rollback;
1252 }
1253
Miklos Vajnaeca35a22008-10-26 02:33:56[diff] [blame]1254 if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1, REF_NODEREF)) {
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1255 if (errno==EISDIR) {
1256 if (remove_empty_directories(git_path("%s", newref))) {
1257 error("Directory not empty: %s", newref);
1258 goto rollback;
1259 }
1260 } else {
1261 error("unable to delete existing %s", newref);
1262 goto rollback;
1263 }
1264 }
1265
1266 if (log && safe_create_leading_directories(git_path("logs/%s", newref))) {
1267 error("unable to create directory for %s", newref);
1268 goto rollback;
1269 }
1270
1271 retry:
Pierre Habouzit765c2252010-07-07 07:47:20[diff] [blame]1272 if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newref))) {
Jason Riedyd9e74d52007-01-16 01:30:59[diff] [blame]1273 if (errno==EISDIR || errno==ENOTDIR) {
1274 /*
1275 * rename(a, b) when b is an existing
1276 * directory ought to result in ISDIR, but
1277 * Solaris 5.8 gives ENOTDIR. Sheesh.
1278 */
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1279 if (remove_empty_directories(git_path("logs/%s", newref))) {
1280 error("Directory not empty: logs/%s", newref);
1281 goto rollback;
1282 }
1283 goto retry;
1284 } else {
Pierre Habouzit765c2252010-07-07 07:47:20[diff] [blame]1285 error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1286 newref, strerror(errno));
1287 goto rollback;
1288 }
1289 }
1290 logmoved = log;
1291
Sven Verdoolaege68db31c2007-05-09 10:33:20[diff] [blame]1292 lock = lock_ref_sha1_basic(newref, NULL, 0, NULL);
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1293 if (!lock) {
1294 error("unable to lock %s for update", newref);
1295 goto rollback;
1296 }
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1297 lock->force_write = 1;
1298 hashcpy(lock->old_sha1, orig_sha1);
Lars Hjemli678d0f42006-11-30 02:16:56[diff] [blame]1299 if (write_ref_sha1(lock, orig_sha1, logmsg)) {
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1300 error("unable to write current sha1 into %s", newref);
1301 goto rollback;
1302 }
1303
1304 return 0;
1305
1306 rollback:
Sven Verdoolaege68db31c2007-05-09 10:33:20[diff] [blame]1307 lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL);
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1308 if (!lock) {
1309 error("unable to lock %s for rollback", oldref);
1310 goto rollbacklog;
1311 }
1312
1313 lock->force_write = 1;
1314 flag = log_all_ref_updates;
1315 log_all_ref_updates = 0;
1316 if (write_ref_sha1(lock, orig_sha1, NULL))
1317 error("unable to write current sha1 into %s", oldref);
1318 log_all_ref_updates = flag;
1319
1320 rollbacklog:
1321 if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref)))
1322 error("unable to restore logfile %s from %s: %s",
1323 oldref, newref, strerror(errno));
1324 if (!logmoved && log &&
Pierre Habouzit765c2252010-07-07 07:47:20[diff] [blame]1325 rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldref)))
1326 error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s",
Lars Hjemlic976d412006-11-28 14:47:40[diff] [blame]1327 oldref, strerror(errno));
1328
1329 return 1;
1330}
1331
Brandon Casey435fc852008-02-22 18:57:30[diff] [blame]1332int close_ref(struct ref_lock *lock)
Brandon Caseyb5313942008-01-16 19:14:30[diff] [blame]1333{
1334 if (close_lock_file(lock->lk))
1335 return -1;
1336 lock->lock_fd = -1;
1337 return 0;
1338}
1339
Brandon Casey435fc852008-02-22 18:57:30[diff] [blame]1340int commit_ref(struct ref_lock *lock)
Brandon Caseyb5313942008-01-16 19:14:30[diff] [blame]1341{
1342 if (commit_lock_file(lock->lk))
1343 return -1;
1344 lock->lock_fd = -1;
1345 return 0;
1346}
1347
Junio C Hamanoe5f38ec2006-06-06 21:04:17[diff] [blame]1348void unlock_ref(struct ref_lock *lock)
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1349{
Brandon Casey4ed7cd32008-01-16 19:12:46[diff] [blame]1350 /* Do not free lock->lk -- atexit() still looks at them */
1351 if (lock->lk)
1352 rollback_lock_file(lock->lk);
Linus Torvalds434cd0c2006-09-14 17:14:47[diff] [blame]1353 free(lock->ref_name);
Nicolas Pitre16557072007-01-26 22:26:06[diff] [blame]1354 free(lock->orig_ref_name);
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1355 free(lock);
1356}
1357
Junio C Hamano0ec29a42007-07-29 00:17:17[diff] [blame]1358/*
1359 * copy the reflog message msg to buf, which has been allocated sufficiently
1360 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1361 * because reflog file is one line per entry.
1362 */
1363static int copy_msg(char *buf, const char *msg)
1364{
1365 char *cp = buf;
1366 char c;
1367 int wasspace = 1;
1368
1369 *cp++ = '\t';
1370 while ((c = *msg++)) {
1371 if (wasspace && isspace(c))
1372 continue;
1373 wasspace = isspace(c);
1374 if (wasspace)
1375 c = ' ';
1376 *cp++ = c;
1377 }
1378 while (buf < cp && isspace(cp[-1]))
1379 cp--;
1380 *cp++ = '\n';
1381 return cp - buf;
1382}
1383
Thomas Rast157aaea2010-06-10 12:54:03[diff] [blame]1384int log_ref_setup(const char *ref_name, char *logfile, int bufsize)
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]1385{
1386 int logfd, oflags = O_APPEND | O_WRONLY;
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]1387
Thomas Rast157aaea2010-06-10 12:54:03[diff] [blame]1388 git_snpath(logfile, bufsize, "logs/%s", ref_name);
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]1389 if (log_all_ref_updates &&
1390 (!prefixcmp(ref_name, "refs/heads/") ||
1391 !prefixcmp(ref_name, "refs/remotes/") ||
1392 !prefixcmp(ref_name, "refs/notes/") ||
1393 !strcmp(ref_name, "HEAD"))) {
Thomas Rast157aaea2010-06-10 12:54:03[diff] [blame]1394 if (safe_create_leading_directories(logfile) < 0)
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]1395 return error("unable to create directory for %s",
Thomas Rast157aaea2010-06-10 12:54:03[diff] [blame]1396 logfile);
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]1397 oflags |= O_CREAT;
1398 }
1399
Thomas Rast157aaea2010-06-10 12:54:03[diff] [blame]1400 logfd = open(logfile, oflags, 0666);
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]1401 if (logfd < 0) {
1402 if (!(oflags & O_CREAT) && errno == ENOENT)
1403 return 0;
1404
1405 if ((oflags & O_CREAT) && errno == EISDIR) {
Thomas Rast157aaea2010-06-10 12:54:03[diff] [blame]1406 if (remove_empty_directories(logfile)) {
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]1407 return error("There are still logs under '%s'",
Thomas Rast157aaea2010-06-10 12:54:03[diff] [blame]1408 logfile);
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]1409 }
Thomas Rast157aaea2010-06-10 12:54:03[diff] [blame]1410 logfd = open(logfile, oflags, 0666);
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]1411 }
1412
1413 if (logfd < 0)
1414 return error("Unable to append to %s: %s",
Thomas Rast157aaea2010-06-10 12:54:03[diff] [blame]1415 logfile, strerror(errno));
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]1416 }
1417
Thomas Rast157aaea2010-06-10 12:54:03[diff] [blame]1418 adjust_shared_perm(logfile);
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]1419 close(logfd);
1420 return 0;
1421}
1422
Nicolas Pitre9a13f0b2007-01-26 22:26:05[diff] [blame]1423static int log_ref_write(const char *ref_name, const unsigned char *old_sha1,
1424 const unsigned char *new_sha1, const char *msg)
Shawn Pearce6de08ae2006-05-17 09:55:40[diff] [blame]1425{
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]1426 int logfd, result, written, oflags = O_APPEND | O_WRONLY;
Shawn Pearce6de08ae2006-05-17 09:55:40[diff] [blame]1427 unsigned maxlen, len;
Junio C Hamano8ac65932007-01-26 10:26:04[diff] [blame]1428 int msglen;
Thomas Rast157aaea2010-06-10 12:54:03[diff] [blame]1429 char log_file[PATH_MAX];
Alex Riesen958a4782008-10-27 10:11:40[diff] [blame]1430 char *logrec;
Alp Tokerff4c8482006-07-09 09:36:24[diff] [blame]1431 const char *committer;
Shawn Pearce6de08ae2006-05-17 09:55:40[diff] [blame]1432
Junio C Hamano510c5a82007-01-07 09:35:34[diff] [blame]1433 if (log_all_ref_updates < 0)
Junio C Hamano7d1864c2007-01-07 10:00:28[diff] [blame]1434 log_all_ref_updates = !is_bare_repository();
Junio C Hamano510c5a82007-01-07 09:35:34[diff] [blame]1435
Thomas Rast157aaea2010-06-10 12:54:03[diff] [blame]1436 result = log_ref_setup(ref_name, log_file, sizeof(log_file));
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]1437 if (result)
1438 return result;
Nicolas Pitre9a13f0b2007-01-26 22:26:05[diff] [blame]1439
Erick Mattos859c3012010-05-22 00:28:36[diff] [blame]1440 logfd = open(log_file, oflags);
1441 if (logfd < 0)
1442 return 0;
Junio C Hamano0ec29a42007-07-29 00:17:17[diff] [blame]1443 msglen = msg ? strlen(msg) : 0;
Junio C Hamano774751a2007-12-09 01:32:08[diff] [blame]1444 committer = git_committer_info(0);
Junio C Hamano8ac65932007-01-26 10:26:04[diff] [blame]1445 maxlen = strlen(committer) + msglen + 100;
1446 logrec = xmalloc(maxlen);
1447 len = sprintf(logrec, "%s %s %s\n",
Nicolas Pitre9a13f0b2007-01-26 22:26:05[diff] [blame]1448 sha1_to_hex(old_sha1),
1449 sha1_to_hex(new_sha1),
Junio C Hamano8ac65932007-01-26 10:26:04[diff] [blame]1450 committer);
1451 if (msglen)
Junio C Hamano0ec29a42007-07-29 00:17:17[diff] [blame]1452 len += copy_msg(logrec + len - 1, msg) - 1;
Andy Whitcroft93822c22007-01-08 15:58:23[diff] [blame]1453 written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
Shawn Pearce6de08ae2006-05-17 09:55:40[diff] [blame]1454 free(logrec);
Jim Meyering91c8d592007-06-24 19:20:41[diff] [blame]1455 if (close(logfd) != 0 || written != len)
Nicolas Pitre9a13f0b2007-01-26 22:26:05[diff] [blame]1456 return error("Unable to append to %s", log_file);
Shawn Pearce6de08ae2006-05-17 09:55:40[diff] [blame]1457 return 0;
1458}
1459
Linus Torvaldsc3b0dec2008-01-15 23:50:17[diff] [blame]1460static int is_branch(const char *refname)
1461{
1462 return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
1463}
1464
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1465int write_ref_sha1(struct ref_lock *lock,
1466 const unsigned char *sha1, const char *logmsg)
1467{
1468 static char term = '\n';
Linus Torvaldsc3b0dec2008-01-15 23:50:17[diff] [blame]1469 struct object *o;
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1470
1471 if (!lock)
1472 return -1;
David Rientjesa89fccd2006-08-17 18:54:57[diff] [blame]1473 if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1474 unlock_ref(lock);
1475 return 0;
1476 }
Linus Torvaldsc3b0dec2008-01-15 23:50:17[diff] [blame]1477 o = parse_object(sha1);
1478 if (!o) {
Dmitry Ivankov7be8b3b2011-06-16 13:42:48[diff] [blame]1479 error("Trying to write ref %s with nonexistent object %s",
Linus Torvaldsc3b0dec2008-01-15 23:50:17[diff] [blame]1480 lock->ref_name, sha1_to_hex(sha1));
1481 unlock_ref(lock);
1482 return -1;
1483 }
1484 if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
1485 error("Trying to write non-commit object %s to branch %s",
1486 sha1_to_hex(sha1), lock->ref_name);
1487 unlock_ref(lock);
1488 return -1;
1489 }
Andy Whitcroft93822c22007-01-08 15:58:23[diff] [blame]1490 if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
1491 write_in_full(lock->lock_fd, &term, 1) != 1
Brandon Caseyb5313942008-01-16 19:14:30[diff] [blame]1492 || close_ref(lock) < 0) {
Junio C Hamanoc33d5172006-06-06 20:54:14[diff] [blame]1493 error("Couldn't write %s", lock->lk->filename);
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1494 unlock_ref(lock);
1495 return -1;
1496 }
Junio C Hamano5e290ff2006-09-30 19:37:37[diff] [blame]1497 invalidate_cached_refs();
Nicolas Pitrebd104db2007-01-26 22:26:07[diff] [blame]1498 if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
1499 (strcmp(lock->ref_name, lock->orig_ref_name) &&
1500 log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
Shawn Pearce6de08ae2006-05-17 09:55:40[diff] [blame]1501 unlock_ref(lock);
1502 return -1;
1503 }
Nicolas Pitre605fac82007-03-21 21:11:44[diff] [blame]1504 if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
1505 /*
1506 * Special hack: If a branch is updated directly and HEAD
1507 * points to it (may happen on the remote side of a push
1508 * for example) then logically the HEAD reflog should be
1509 * updated too.
1510 * A generic solution implies reverse symref information,
1511 * but finding all symrefs pointing to the given branch
1512 * would be rather costly for this rare event (the direct
1513 * update of a branch) to be worth it. So let's cheat and
1514 * check with HEAD only which should cover 99% of all usage
1515 * scenarios (even 100% of the default ones).
1516 */
1517 unsigned char head_sha1[20];
1518 int head_flag;
1519 const char *head_ref;
1520 head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag);
1521 if (head_ref && (head_flag & REF_ISSYMREF) &&
1522 !strcmp(head_ref, lock->ref_name))
1523 log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
1524 }
Brandon Caseyb5313942008-01-16 19:14:30[diff] [blame]1525 if (commit_ref(lock)) {
Linus Torvalds434cd0c2006-09-14 17:14:47[diff] [blame]1526 error("Couldn't set %s", lock->ref_name);
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1527 unlock_ref(lock);
1528 return -1;
1529 }
Shawn Pearce4bd18c42006-05-17 09:55:02[diff] [blame]1530 unlock_ref(lock);
1531 return 0;
Daniel Barkalow95fc7512005-06-06 20:31:29[diff] [blame]1532}
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]1533
Nicolas Pitre8b5157e2007-01-26 22:26:10[diff] [blame]1534int create_symref(const char *ref_target, const char *refs_heads_master,
1535 const char *logmsg)
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]1536{
1537 const char *lockpath;
1538 char ref[1000];
1539 int fd, len, written;
Alex Riesena4f34cb2008-10-27 10:22:09[diff] [blame]1540 char *git_HEAD = git_pathdup("%s", ref_target);
Nicolas Pitre8b5157e2007-01-26 22:26:10[diff] [blame]1541 unsigned char old_sha1[20], new_sha1[20];
1542
1543 if (logmsg && read_ref(ref_target, old_sha1))
1544 hashclr(old_sha1);
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]1545
Junio C Hamanod48744d2007-02-08 07:41:43[diff] [blame]1546 if (safe_create_leading_directories(git_HEAD) < 0)
1547 return error("unable to create directory for %s", git_HEAD);
1548
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]1549#ifndef NO_SYMLINK_HEAD
1550 if (prefer_symlink_refs) {
1551 unlink(git_HEAD);
1552 if (!symlink(refs_heads_master, git_HEAD))
Nicolas Pitre8b5157e2007-01-26 22:26:10[diff] [blame]1553 goto done;
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]1554 fprintf(stderr, "no symlink - falling back to symbolic ref\n");
1555 }
1556#endif
1557
1558 len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
1559 if (sizeof(ref) <= len) {
1560 error("refname too long: %s", refs_heads_master);
Junio C Hamano47fc52e2007-01-27 01:49:00[diff] [blame]1561 goto error_free_return;
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]1562 }
1563 lockpath = mkpath("%s.lock", git_HEAD);
1564 fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
1565 if (fd < 0) {
1566 error("Unable to open %s for writing", lockpath);
Junio C Hamano47fc52e2007-01-27 01:49:00[diff] [blame]1567 goto error_free_return;
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]1568 }
1569 written = write_in_full(fd, ref, len);
Jim Meyering91c8d592007-06-24 19:20:41[diff] [blame]1570 if (close(fd) != 0 || written != len) {
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]1571 error("Unable to write to %s", lockpath);
Junio C Hamano47fc52e2007-01-27 01:49:00[diff] [blame]1572 goto error_unlink_return;
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]1573 }
1574 if (rename(lockpath, git_HEAD) < 0) {
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]1575 error("Unable to create %s", git_HEAD);
Junio C Hamano47fc52e2007-01-27 01:49:00[diff] [blame]1576 goto error_unlink_return;
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]1577 }
1578 if (adjust_shared_perm(git_HEAD)) {
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]1579 error("Unable to fix permissions on %s", lockpath);
Junio C Hamano47fc52e2007-01-27 01:49:00[diff] [blame]1580 error_unlink_return:
Alex Riesen691f1a22009-04-29 21:22:56[diff] [blame]1581 unlink_or_warn(lockpath);
Junio C Hamano47fc52e2007-01-27 01:49:00[diff] [blame]1582 error_free_return:
1583 free(git_HEAD);
1584 return -1;
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]1585 }
Nicolas Pitre8b5157e2007-01-26 22:26:10[diff] [blame]1586
Ramsay Jonesee96d112007-03-03 18:28:46[diff] [blame]1587#ifndef NO_SYMLINK_HEAD
Nicolas Pitre8b5157e2007-01-26 22:26:10[diff] [blame]1588 done:
Ramsay Jonesee96d112007-03-03 18:28:46[diff] [blame]1589#endif
Nicolas Pitre8b5157e2007-01-26 22:26:10[diff] [blame]1590 if (logmsg && !read_ref(refs_heads_master, new_sha1))
1591 log_ref_write(ref_target, old_sha1, new_sha1, logmsg);
1592
Junio C Hamano47fc52e2007-01-27 01:49:00[diff] [blame]1593 free(git_HEAD);
Nicolas Pitre41b625b2007-01-26 22:26:09[diff] [blame]1594 return 0;
1595}
1596
Junio C Hamano16d7cc92007-01-19 09:19:05[diff] [blame]1597static char *ref_msg(const char *line, const char *endp)
1598{
1599 const char *ep;
Junio C Hamano16d7cc92007-01-19 09:19:05[diff] [blame]1600 line += 82;
Pierre Habouzit182af832007-09-15 22:32:36[diff] [blame]1601 ep = memchr(line, '\n', endp - line);
1602 if (!ep)
1603 ep = endp;
1604 return xmemdupz(line, ep - line);
Junio C Hamano16d7cc92007-01-19 09:19:05[diff] [blame]1605}
1606
1607int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *sha1, char **msg, unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]1608{
Shawn Pearcee5229042006-05-19 07:28:19[diff] [blame]1609 const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]1610 char *tz_c;
Junio C Hamanoe29cb532006-12-19 06:07:45[diff] [blame]1611 int logfd, tz, reccnt = 0;
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]1612 struct stat st;
1613 unsigned long date;
Shawn Pearcee5229042006-05-19 07:28:19[diff] [blame]1614 unsigned char logged_sha1[20];
Junio C Hamanocb48cb52007-01-19 08:39:32[diff] [blame]1615 void *log_mapped;
Shawn O. Pearcedc49cd72007-03-07 01:44:37[diff] [blame]1616 size_t mapsz;
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]1617
1618 logfile = git_path("logs/%s", ref);
1619 logfd = open(logfile, O_RDONLY, 0);
1620 if (logfd < 0)
Thomas Rastd824cbb2009-06-27 15:58:46[diff] [blame]1621 die_errno("Unable to read log '%s'", logfile);
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]1622 fstat(logfd, &st);
1623 if (!st.st_size)
1624 die("Log %s is empty.", logfile);
Shawn O. Pearcedc49cd72007-03-07 01:44:37[diff] [blame]1625 mapsz = xsize_t(st.st_size);
1626 log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0);
Junio C Hamanocb48cb52007-01-19 08:39:32[diff] [blame]1627 logdata = log_mapped;
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]1628 close(logfd);
1629
Shawn Pearcee5229042006-05-19 07:28:19[diff] [blame]1630 lastrec = NULL;
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]1631 rec = logend = logdata + st.st_size;
1632 while (logdata < rec) {
Junio C Hamanoe29cb532006-12-19 06:07:45[diff] [blame]1633 reccnt++;
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]1634 if (logdata < rec && *(rec-1) == '\n')
1635 rec--;
Shawn Pearcee5229042006-05-19 07:28:19[diff] [blame]1636 lastgt = NULL;
1637 while (logdata < rec && *(rec-1) != '\n') {
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]1638 rec--;
Shawn Pearcee5229042006-05-19 07:28:19[diff] [blame]1639 if (*rec == '>')
1640 lastgt = rec;
1641 }
1642 if (!lastgt)
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]1643 die("Log %s is corrupt.", logfile);
Shawn Pearcee5229042006-05-19 07:28:19[diff] [blame]1644 date = strtoul(lastgt + 1, &tz_c, 10);
Junio C Hamanoab2a1a32006-10-06 06:16:15[diff] [blame]1645 if (date <= at_time || cnt == 0) {
Junio C Hamano76a44c52007-01-19 09:20:23[diff] [blame]1646 tz = strtoul(tz_c, NULL, 10);
Junio C Hamano16d7cc92007-01-19 09:19:05[diff] [blame]1647 if (msg)
1648 *msg = ref_msg(rec, logend);
1649 if (cutoff_time)
1650 *cutoff_time = date;
1651 if (cutoff_tz)
1652 *cutoff_tz = tz;
1653 if (cutoff_cnt)
Junio C Hamano76a44c52007-01-19 09:20:23[diff] [blame]1654 *cutoff_cnt = reccnt - 1;
Shawn Pearcee5229042006-05-19 07:28:19[diff] [blame]1655 if (lastrec) {
1656 if (get_sha1_hex(lastrec, logged_sha1))
1657 die("Log %s is corrupt.", logfile);
1658 if (get_sha1_hex(rec + 41, sha1))
1659 die("Log %s is corrupt.", logfile);
David Rientjesa89fccd2006-08-17 18:54:57[diff] [blame]1660 if (hashcmp(logged_sha1, sha1)) {
Miklos Vajnaedbc25c2009-03-24 01:09:17[diff] [blame]1661 warning("Log %s has gap after %s.",
Junio C Hamano73013af2007-07-14 06:14:52[diff] [blame]1662 logfile, show_date(date, tz, DATE_RFC2822));
Shawn Pearcee5229042006-05-19 07:28:19[diff] [blame]1663 }
Junio C Hamanoe5f38ec2006-06-06 21:04:17[diff] [blame]1664 }
1665 else if (date == at_time) {
Shawn Pearcee5229042006-05-19 07:28:19[diff] [blame]1666 if (get_sha1_hex(rec + 41, sha1))
1667 die("Log %s is corrupt.", logfile);
Junio C Hamanoe5f38ec2006-06-06 21:04:17[diff] [blame]1668 }
1669 else {
Shawn Pearcee5229042006-05-19 07:28:19[diff] [blame]1670 if (get_sha1_hex(rec + 41, logged_sha1))
1671 die("Log %s is corrupt.", logfile);
David Rientjesa89fccd2006-08-17 18:54:57[diff] [blame]1672 if (hashcmp(logged_sha1, sha1)) {
Miklos Vajnaedbc25c2009-03-24 01:09:17[diff] [blame]1673 warning("Log %s unexpectedly ended on %s.",
Junio C Hamano73013af2007-07-14 06:14:52[diff] [blame]1674 logfile, show_date(date, tz, DATE_RFC2822));
Shawn Pearcee5229042006-05-19 07:28:19[diff] [blame]1675 }
1676 }
Shawn O. Pearcedc49cd72007-03-07 01:44:37[diff] [blame]1677 munmap(log_mapped, mapsz);
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]1678 return 0;
1679 }
Shawn Pearcee5229042006-05-19 07:28:19[diff] [blame]1680 lastrec = rec;
Junio C Hamanoab2a1a32006-10-06 06:16:15[diff] [blame]1681 if (cnt > 0)
1682 cnt--;
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]1683 }
1684
Shawn Pearcee5229042006-05-19 07:28:19[diff] [blame]1685 rec = logdata;
1686 while (rec < logend && *rec != '>' && *rec != '\n')
1687 rec++;
1688 if (rec == logend || *rec == '\n')
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]1689 die("Log %s is corrupt.", logfile);
Shawn Pearcee5229042006-05-19 07:28:19[diff] [blame]1690 date = strtoul(rec + 1, &tz_c, 10);
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]1691 tz = strtoul(tz_c, NULL, 10);
1692 if (get_sha1_hex(logdata, sha1))
1693 die("Log %s is corrupt.", logfile);
Jeff Kingd1a44892008-07-08 04:38:54[diff] [blame]1694 if (is_null_sha1(sha1)) {
1695 if (get_sha1_hex(logdata + 41, sha1))
1696 die("Log %s is corrupt.", logfile);
1697 }
Junio C Hamano16d7cc92007-01-19 09:19:05[diff] [blame]1698 if (msg)
1699 *msg = ref_msg(logdata, logend);
Shawn O. Pearcedc49cd72007-03-07 01:44:37[diff] [blame]1700 munmap(log_mapped, mapsz);
Junio C Hamano16d7cc92007-01-19 09:19:05[diff] [blame]1701
1702 if (cutoff_time)
1703 *cutoff_time = date;
1704 if (cutoff_tz)
1705 *cutoff_tz = tz;
1706 if (cutoff_cnt)
1707 *cutoff_cnt = reccnt;
1708 return 1;
Shawn Pearced556fae2006-05-17 09:56:09[diff] [blame]1709}
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]1710
Junio C Hamano101d15e2009-01-20 06:18:29[diff] [blame]1711int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long ofs, void *cb_data)
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]1712{
1713 const char *logfile;
1714 FILE *logfp;
René Scharfe8ca78802010-03-13 17:37:50[diff] [blame]1715 struct strbuf sb = STRBUF_INIT;
Junio C Hamano2266bf22007-01-19 07:25:54[diff] [blame]1716 int ret = 0;
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]1717
1718 logfile = git_path("logs/%s", ref);
1719 logfp = fopen(logfile, "r");
1720 if (!logfp)
Johannes Schindelin883d60f2007-01-08 00:59:54[diff] [blame]1721 return -1;
Junio C Hamano101d15e2009-01-20 06:18:29[diff] [blame]1722
1723 if (ofs) {
1724 struct stat statbuf;
1725 if (fstat(fileno(logfp), &statbuf) ||
1726 statbuf.st_size < ofs ||
1727 fseek(logfp, -ofs, SEEK_END) ||
René Scharfe8ca78802010-03-13 17:37:50[diff] [blame]1728 strbuf_getwholeline(&sb, logfp, '\n')) {
Brandon Casey9d33f7c2009-07-16 21:25:18[diff] [blame]1729 fclose(logfp);
René Scharfe8ca78802010-03-13 17:37:50[diff] [blame]1730 strbuf_release(&sb);
Junio C Hamano101d15e2009-01-20 06:18:29[diff] [blame]1731 return -1;
Brandon Casey9d33f7c2009-07-16 21:25:18[diff] [blame]1732 }
Junio C Hamano101d15e2009-01-20 06:18:29[diff] [blame]1733 }
1734
René Scharfe8ca78802010-03-13 17:37:50[diff] [blame]1735 while (!strbuf_getwholeline(&sb, logfp, '\n')) {
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]1736 unsigned char osha1[20], nsha1[20];
Johannes Schindelin883d60f2007-01-08 00:59:54[diff] [blame]1737 char *email_end, *message;
1738 unsigned long timestamp;
René Scharfe8ca78802010-03-13 17:37:50[diff] [blame]1739 int tz;
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]1740
1741 /* old SP new SP name <email> SP time TAB msg LF */
René Scharfe8ca78802010-03-13 17:37:50[diff] [blame]1742 if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' ||
1743 get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' ||
1744 get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' ||
1745 !(email_end = strchr(sb.buf + 82, '>')) ||
Johannes Schindelin883d60f2007-01-08 00:59:54[diff] [blame]1746 email_end[1] != ' ' ||
1747 !(timestamp = strtoul(email_end + 2, &message, 10)) ||
1748 !message || message[0] != ' ' ||
1749 (message[1] != '+' && message[1] != '-') ||
1750 !isdigit(message[2]) || !isdigit(message[3]) ||
Johannes Schindelinb4dd4852007-02-08 23:59:47[diff] [blame]1751 !isdigit(message[4]) || !isdigit(message[5]))
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]1752 continue; /* corrupt? */
Johannes Schindelin883d60f2007-01-08 00:59:54[diff] [blame]1753 email_end[1] = '\0';
1754 tz = strtol(message + 1, NULL, 10);
Johannes Schindelinb4dd4852007-02-08 23:59:47[diff] [blame]1755 if (message[6] != '\t')
1756 message += 6;
1757 else
1758 message += 7;
René Scharfe8ca78802010-03-13 17:37:50[diff] [blame]1759 ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message,
1760 cb_data);
Johannes Schindelin883d60f2007-01-08 00:59:54[diff] [blame]1761 if (ret)
Junio C Hamano2266bf22007-01-19 07:25:54[diff] [blame]1762 break;
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]1763 }
1764 fclose(logfp);
René Scharfe8ca78802010-03-13 17:37:50[diff] [blame]1765 strbuf_release(&sb);
Junio C Hamano2266bf22007-01-19 07:25:54[diff] [blame]1766 return ret;
Junio C Hamano2ff81662006-12-18 09:18:16[diff] [blame]1767}
Junio C Hamanoe29cb532006-12-19 06:07:45[diff] [blame]1768
Junio C Hamano101d15e2009-01-20 06:18:29[diff] [blame]1769int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data)
1770{
1771 return for_each_recent_reflog_ent(ref, fn, 0, cb_data);
1772}
1773
Nicolas Pitreeb8381c2007-02-03 18:25:43[diff] [blame]1774static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data)
1775{
1776 DIR *dir = opendir(git_path("logs/%s", base));
Junio C Hamanofcee5a12007-02-07 17:18:57[diff] [blame]1777 int retval = 0;
Nicolas Pitreeb8381c2007-02-03 18:25:43[diff] [blame]1778
1779 if (dir) {
1780 struct dirent *de;
1781 int baselen = strlen(base);
1782 char *log = xmalloc(baselen + 257);
1783
1784 memcpy(log, base, baselen);
1785 if (baselen && base[baselen-1] != '/')
1786 log[baselen++] = '/';
1787
1788 while ((de = readdir(dir)) != NULL) {
1789 struct stat st;
1790 int namelen;
1791
1792 if (de->d_name[0] == '.')
1793 continue;
1794 namelen = strlen(de->d_name);
1795 if (namelen > 255)
1796 continue;
1797 if (has_extension(de->d_name, ".lock"))
1798 continue;
1799 memcpy(log + baselen, de->d_name, namelen+1);
1800 if (stat(git_path("logs/%s", log), &st) < 0)
1801 continue;
1802 if (S_ISDIR(st.st_mode)) {
1803 retval = do_for_each_reflog(log, fn, cb_data);
1804 } else {
1805 unsigned char sha1[20];
1806 if (!resolve_ref(log, sha1, 0, NULL))
1807 retval = error("bad ref for %s", log);
1808 else
1809 retval = fn(log, sha1, 0, cb_data);
1810 }
1811 if (retval)
1812 break;
1813 }
1814 free(log);
1815 closedir(dir);
1816 }
Junio C Hamanoacb39f62007-02-13 07:21:34[diff] [blame]1817 else if (*base)
Junio C Hamanofcee5a12007-02-07 17:18:57[diff] [blame]1818 return errno;
Nicolas Pitreeb8381c2007-02-03 18:25:43[diff] [blame]1819 return retval;
1820}
1821
1822int for_each_reflog(each_ref_fn fn, void *cb_data)
1823{
1824 return do_for_each_reflog("", fn, cb_data);
1825}
Carlos Rica3d9f0372007-09-05 01:38:24[diff] [blame]1826
1827int update_ref(const char *action, const char *refname,
1828 const unsigned char *sha1, const unsigned char *oldval,
1829 int flags, enum action_on_err onerr)
1830{
1831 static struct ref_lock *lock;
1832 lock = lock_any_ref_for_update(refname, oldval, flags);
1833 if (!lock) {
1834 const char *str = "Cannot lock the ref '%s'.";
1835 switch (onerr) {
1836 case MSG_ON_ERR: error(str, refname); break;
1837 case DIE_ON_ERR: die(str, refname); break;
1838 case QUIET_ON_ERR: break;
1839 }
1840 return 1;
1841 }
1842 if (write_ref_sha1(lock, sha1, action) < 0) {
1843 const char *str = "Cannot update the ref '%s'.";
1844 switch (onerr) {
1845 case MSG_ON_ERR: error(str, refname); break;
1846 case DIE_ON_ERR: die(str, refname); break;
1847 case QUIET_ON_ERR: break;
1848 }
1849 return 1;
1850 }
1851 return 0;
1852}
Jeff Kingcda69f42007-11-18 07:13:10[diff] [blame]1853
Junio C Hamanoc17b2292011-06-06 05:17:04[diff] [blame]1854int ref_exists(char *refname)
1855{
1856 unsigned char sha1[20];
1857 return !!resolve_ref(refname, sha1, 1, NULL);
1858}
1859
Jeff King5483f792009-02-25 08:32:10[diff] [blame]1860struct ref *find_ref_by_name(const struct ref *list, const char *name)
Jeff Kingcda69f42007-11-18 07:13:10[diff] [blame]1861{
1862 for ( ; list; list = list->next)
1863 if (!strcmp(list->name, name))
Jeff King5483f792009-02-25 08:32:10[diff] [blame]1864 return (struct ref *)list;
Jeff Kingcda69f42007-11-18 07:13:10[diff] [blame]1865 return NULL;
1866}
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]1867
1868/*
1869 * generate a format suitable for scanf from a ref_rev_parse_rules
1870 * rule, that is replace the "%.*s" spec with a "%s" spec
1871 */
1872static void gen_scanf_fmt(char *scanf_fmt, const char *rule)
1873{
1874 char *spec;
1875
1876 spec = strstr(rule, "%.*s");
1877 if (!spec || strstr(spec + 4, "%.*s"))
1878 die("invalid rule in ref_rev_parse_rules: %s", rule);
1879
1880 /* copy all until spec */
1881 strncpy(scanf_fmt, rule, spec - rule);
1882 scanf_fmt[spec - rule] = '\0';
1883 /* copy new spec */
1884 strcat(scanf_fmt, "%s");
1885 /* copy remaining rule */
1886 strcat(scanf_fmt, spec + 4);
1887
1888 return;
1889}
1890
Bert Wesarg6e7b3302009-04-13 10:25:46[diff] [blame]1891char *shorten_unambiguous_ref(const char *ref, int strict)
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]1892{
1893 int i;
1894 static char **scanf_fmts;
1895 static int nr_rules;
1896 char *short_name;
1897
1898 /* pre generate scanf formats from ref_rev_parse_rules[] */
1899 if (!nr_rules) {
1900 size_t total_len = 0;
1901
1902 /* the rule list is NULL terminated, count them first */
1903 for (; ref_rev_parse_rules[nr_rules]; nr_rules++)
1904 /* no +1 because strlen("%s") < strlen("%.*s") */
1905 total_len += strlen(ref_rev_parse_rules[nr_rules]);
1906
1907 scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len);
1908
1909 total_len = 0;
1910 for (i = 0; i < nr_rules; i++) {
1911 scanf_fmts[i] = (char *)&scanf_fmts[nr_rules]
1912 + total_len;
1913 gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]);
1914 total_len += strlen(ref_rev_parse_rules[i]);
1915 }
1916 }
1917
1918 /* bail out if there are no rules */
1919 if (!nr_rules)
1920 return xstrdup(ref);
1921
1922 /* buffer for scanf result, at most ref must fit */
1923 short_name = xstrdup(ref);
1924
1925 /* skip first rule, it will always match */
1926 for (i = nr_rules - 1; i > 0 ; --i) {
1927 int j;
Bert Wesarg6e7b3302009-04-13 10:25:46[diff] [blame]1928 int rules_to_fail = i;
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]1929 int short_name_len;
1930
1931 if (1 != sscanf(ref, scanf_fmts[i], short_name))
1932 continue;
1933
1934 short_name_len = strlen(short_name);
1935
1936 /*
Bert Wesarg6e7b3302009-04-13 10:25:46[diff] [blame]1937 * in strict mode, all (except the matched one) rules
1938 * must fail to resolve to a valid non-ambiguous ref
1939 */
1940 if (strict)
1941 rules_to_fail = nr_rules;
1942
1943 /*
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]1944 * check if the short name resolves to a valid ref,
1945 * but use only rules prior to the matched one
1946 */
Bert Wesarg6e7b3302009-04-13 10:25:46[diff] [blame]1947 for (j = 0; j < rules_to_fail; j++) {
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]1948 const char *rule = ref_rev_parse_rules[j];
1949 unsigned char short_objectname[20];
1950 char refname[PATH_MAX];
1951
Bert Wesarg6e7b3302009-04-13 10:25:46[diff] [blame]1952 /* skip matched rule */
1953 if (i == j)
1954 continue;
1955
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]1956 /*
1957 * the short name is ambiguous, if it resolves
1958 * (with this previous rule) to a valid ref
1959 * read_ref() returns 0 on success
1960 */
1961 mksnpath(refname, sizeof(refname),
1962 rule, short_name_len, short_name);
1963 if (!read_ref(refname, short_objectname))
1964 break;
1965 }
1966
1967 /*
1968 * short name is non-ambiguous if all previous rules
1969 * haven't resolved to a valid ref
1970 */
Bert Wesarg6e7b3302009-04-13 10:25:46[diff] [blame]1971 if (j == rules_to_fail)
Jeff King7c2b3022009-04-07 07:14:20[diff] [blame]1972 return short_name;
1973 }
1974
1975 free(short_name);
1976 return xstrdup(ref);
1977}