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chromium / external / github.com / git / git / refs/tags/v2.0.0-rc0 / . / fsck.c
blob: abed62bac77c67e7c7447a18fea75f228406baac [file] [log] [blame]
Martin Koegler355885d2008-02-25 21:46:04[diff] [blame]1#include "cache.h"
2#include "object.h"
3#include "blob.h"
4#include "tree.h"
5#include "tree-walk.h"
6#include "commit.h"
7#include "tag.h"
8#include "fsck.h"
9
10static int fsck_walk_tree(struct tree *tree, fsck_walk_func walk, void *data)
11{
12 struct tree_desc desc;
13 struct name_entry entry;
14 int res = 0;
15
16 if (parse_tree(tree))
17 return -1;
18
19 init_tree_desc(&desc, tree->buffer, tree->size);
20 while (tree_entry(&desc, &entry)) {
21 int result;
22
23 if (S_ISGITLINK(entry.mode))
24 continue;
25 if (S_ISDIR(entry.mode))
26 result = walk(&lookup_tree(entry.sha1)->object, OBJ_TREE, data);
27 else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode))
28 result = walk(&lookup_blob(entry.sha1)->object, OBJ_BLOB, data);
29 else {
Pete Wyckoff82247e92012-04-30 00:28:45[diff] [blame]30 result = error("in tree %s: entry %s has bad mode %.6o",
Martin Koegler355885d2008-02-25 21:46:04[diff] [blame]31 sha1_to_hex(tree->object.sha1), entry.path, entry.mode);
32 }
33 if (result < 0)
34 return result;
35 if (!res)
36 res = result;
37 }
38 return res;
39}
40
41static int fsck_walk_commit(struct commit *commit, fsck_walk_func walk, void *data)
42{
43 struct commit_list *parents;
44 int res;
45 int result;
46
47 if (parse_commit(commit))
48 return -1;
49
50 result = walk((struct object *)commit->tree, OBJ_TREE, data);
51 if (result < 0)
52 return result;
53 res = result;
54
55 parents = commit->parents;
56 while (parents) {
57 result = walk((struct object *)parents->item, OBJ_COMMIT, data);
58 if (result < 0)
59 return result;
60 if (!res)
61 res = result;
62 parents = parents->next;
63 }
64 return res;
65}
66
67static int fsck_walk_tag(struct tag *tag, fsck_walk_func walk, void *data)
68{
69 if (parse_tag(tag))
70 return -1;
71 return walk(tag->tagged, OBJ_ANY, data);
72}
73
74int fsck_walk(struct object *obj, fsck_walk_func walk, void *data)
75{
76 if (!obj)
77 return -1;
78 switch (obj->type) {
79 case OBJ_BLOB:
80 return 0;
81 case OBJ_TREE:
82 return fsck_walk_tree((struct tree *)obj, walk, data);
83 case OBJ_COMMIT:
84 return fsck_walk_commit((struct commit *)obj, walk, data);
85 case OBJ_TAG:
86 return fsck_walk_tag((struct tag *)obj, walk, data);
87 default:
88 error("Unknown object type for %s", sha1_to_hex(obj->sha1));
89 return -1;
90 }
91}
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]92
93/*
94 * The entries in a tree are ordered in the _path_ order,
95 * which means that a directory entry is ordered by adding
96 * a slash to the end of it.
97 *
98 * So a directory called "a" is ordered _after_ a file
99 * called "a.c", because "a/" sorts after "a.c".
100 */
101#define TREE_UNORDERED (-1)
102#define TREE_HAS_DUPS (-2)
103
104static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
105{
106 int len1 = strlen(name1);
107 int len2 = strlen(name2);
108 int len = len1 < len2 ? len1 : len2;
109 unsigned char c1, c2;
110 int cmp;
111
112 cmp = memcmp(name1, name2, len);
113 if (cmp < 0)
114 return 0;
115 if (cmp > 0)
116 return TREE_UNORDERED;
117
118 /*
119 * Ok, the first <len> characters are the same.
120 * Now we need to order the next one, but turn
121 * a '\0' into a '/' for a directory entry.
122 */
123 c1 = name1[len];
124 c2 = name2[len];
125 if (!c1 && !c2)
126 /*
127 * git-write-tree used to write out a nonsense tree that has
128 * entries with the same name, one blob and one tree. Make
129 * sure we do not have duplicate entries.
130 */
131 return TREE_HAS_DUPS;
132 if (!c1 && S_ISDIR(mode1))
133 c1 = '/';
134 if (!c2 && S_ISDIR(mode2))
135 c2 = '/';
136 return c1 < c2 ? 0 : TREE_UNORDERED;
137}
138
139static int fsck_tree(struct tree *item, int strict, fsck_error error_func)
140{
141 int retval;
Jeff Kingc479d142012-07-28 15:06:29[diff] [blame]142 int has_null_sha1 = 0;
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]143 int has_full_path = 0;
144 int has_empty_name = 0;
Jeff King5d34a432012-11-28 02:27:37[diff] [blame]145 int has_dot = 0;
146 int has_dotdot = 0;
Jeff King5c17f512012-11-28 21:35:29[diff] [blame]147 int has_dotgit = 0;
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]148 int has_zero_pad = 0;
149 int has_bad_modes = 0;
150 int has_dup_entries = 0;
151 int not_properly_sorted = 0;
152 struct tree_desc desc;
153 unsigned o_mode;
154 const char *o_name;
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]155
156 init_tree_desc(&desc, item->buffer, item->size);
157
158 o_mode = 0;
159 o_name = NULL;
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]160
161 while (desc.size) {
162 unsigned mode;
163 const char *name;
Jeff Kingc479d142012-07-28 15:06:29[diff] [blame]164 const unsigned char *sha1;
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]165
Jeff Kingc479d142012-07-28 15:06:29[diff] [blame]166 sha1 = tree_entry_extract(&desc, &name, &mode);
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]167
Hiroyuki Sanoeffd12e2014-03-19 23:02:04[diff] [blame]168 has_null_sha1 |= is_null_sha1(sha1);
169 has_full_path |= !!strchr(name, '/');
170 has_empty_name |= !*name;
171 has_dot |= !strcmp(name, ".");
172 has_dotdot |= !strcmp(name, "..");
173 has_dotgit |= !strcmp(name, ".git");
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]174 has_zero_pad |= *(char *)desc.buffer == '0';
175 update_tree_entry(&desc);
176
177 switch (mode) {
178 /*
179 * Standard modes..
180 */
181 case S_IFREG | 0755:
182 case S_IFREG | 0644:
183 case S_IFLNK:
184 case S_IFDIR:
185 case S_IFGITLINK:
186 break;
187 /*
188 * This is nonstandard, but we had a few of these
189 * early on when we honored the full set of mode
190 * bits..
191 */
192 case S_IFREG | 0664:
193 if (!strict)
194 break;
195 default:
196 has_bad_modes = 1;
197 }
198
199 if (o_name) {
200 switch (verify_ordered(o_mode, o_name, mode, name)) {
201 case TREE_UNORDERED:
202 not_properly_sorted = 1;
203 break;
204 case TREE_HAS_DUPS:
205 has_dup_entries = 1;
206 break;
207 default:
208 break;
209 }
210 }
211
212 o_mode = mode;
213 o_name = name;
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]214 }
215
216 retval = 0;
Jeff Kingc479d142012-07-28 15:06:29[diff] [blame]217 if (has_null_sha1)
218 retval += error_func(&item->object, FSCK_WARN, "contains entries pointing to null sha1");
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]219 if (has_full_path)
220 retval += error_func(&item->object, FSCK_WARN, "contains full pathnames");
221 if (has_empty_name)
222 retval += error_func(&item->object, FSCK_WARN, "contains empty pathname");
Jeff King5d34a432012-11-28 02:27:37[diff] [blame]223 if (has_dot)
224 retval += error_func(&item->object, FSCK_WARN, "contains '.'");
225 if (has_dotdot)
226 retval += error_func(&item->object, FSCK_WARN, "contains '..'");
Jeff King5c17f512012-11-28 21:35:29[diff] [blame]227 if (has_dotgit)
228 retval += error_func(&item->object, FSCK_WARN, "contains '.git'");
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]229 if (has_zero_pad)
230 retval += error_func(&item->object, FSCK_WARN, "contains zero-padded file modes");
231 if (has_bad_modes)
232 retval += error_func(&item->object, FSCK_WARN, "contains bad file modes");
233 if (has_dup_entries)
234 retval += error_func(&item->object, FSCK_ERROR, "contains duplicate file entries");
235 if (not_properly_sorted)
236 retval += error_func(&item->object, FSCK_ERROR, "not properly sorted");
237 return retval;
238}
239
Yuxuan Shuide421802014-03-13 04:45:50[diff] [blame]240static int fsck_ident(const char **ident, struct object *obj, fsck_error error_func)
Jonathan Niederdaae1922010-04-24 16:06:08[diff] [blame]241{
Jeff Kingd4b8de02014-02-24 07:39:04[diff] [blame]242 char *end;
243
Dmitry Ivankov53f53cf2011-08-11 10:21:10[diff] [blame]244 if (**ident == '<')
Jonathan Niederdaae1922010-04-24 16:06:08[diff] [blame]245 return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
Dmitry Ivankov53f53cf2011-08-11 10:21:10[diff] [blame]246 *ident += strcspn(*ident, "<>\n");
247 if (**ident == '>')
248 return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad name");
Jonathan Niederdaae1922010-04-24 16:06:08[diff] [blame]249 if (**ident != '<')
250 return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing email");
Dmitry Ivankov53f53cf2011-08-11 10:21:10[diff] [blame]251 if ((*ident)[-1] != ' ')
252 return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
Jonathan Niederdaae1922010-04-24 16:06:08[diff] [blame]253 (*ident)++;
254 *ident += strcspn(*ident, "<>\n");
255 if (**ident != '>')
256 return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad email");
257 (*ident)++;
258 if (**ident != ' ')
259 return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before date");
260 (*ident)++;
261 if (**ident == '0' && (*ident)[1] != ' ')
262 return error_func(obj, FSCK_ERROR, "invalid author/committer line - zero-padded date");
Jeff King7ca36d92014-02-24 07:39:45[diff] [blame]263 if (date_overflows(strtoul(*ident, &end, 10)))
Jeff Kingd4b8de02014-02-24 07:39:04[diff] [blame]264 return error_func(obj, FSCK_ERROR, "invalid author/committer line - date causes integer overflow");
265 if (end == *ident || *end != ' ')
Jonathan Niederdaae1922010-04-24 16:06:08[diff] [blame]266 return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad date");
Jeff Kingd4b8de02014-02-24 07:39:04[diff] [blame]267 *ident = end + 1;
Jonathan Niederdaae1922010-04-24 16:06:08[diff] [blame]268 if ((**ident != '+' && **ident != '-') ||
269 !isdigit((*ident)[1]) ||
270 !isdigit((*ident)[2]) ||
271 !isdigit((*ident)[3]) ||
272 !isdigit((*ident)[4]) ||
273 ((*ident)[5] != '\n'))
274 return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad time zone");
275 (*ident) += 6;
276 return 0;
277}
278
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]279static int fsck_commit(struct commit *commit, fsck_error error_func)
280{
Yuxuan Shui2d820a62014-03-13 04:45:51[diff] [blame]281 const char *buffer = commit->buffer, *tmp;
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]282 unsigned char tree_sha1[20], sha1[20];
283 struct commit_graft *graft;
284 int parents = 0;
Jonathan Niederdaae1922010-04-24 16:06:08[diff] [blame]285 int err;
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]286
Yuxuan Shui2d820a62014-03-13 04:45:51[diff] [blame]287 buffer = skip_prefix(buffer, "tree ");
288 if (!buffer)
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]289 return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'tree' line");
Yuxuan Shui2d820a62014-03-13 04:45:51[diff] [blame]290 if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n')
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]291 return error_func(&commit->object, FSCK_ERROR, "invalid 'tree' line format - bad sha1");
Yuxuan Shui2d820a62014-03-13 04:45:51[diff] [blame]292 buffer += 41;
293 while ((tmp = skip_prefix(buffer, "parent "))) {
294 buffer = tmp;
295 if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n')
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]296 return error_func(&commit->object, FSCK_ERROR, "invalid 'parent' line format - bad sha1");
Yuxuan Shui2d820a62014-03-13 04:45:51[diff] [blame]297 buffer += 41;
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]298 parents++;
299 }
300 graft = lookup_commit_graft(commit->object.sha1);
301 if (graft) {
302 struct commit_list *p = commit->parents;
303 parents = 0;
304 while (p) {
305 p = p->next;
306 parents++;
307 }
308 if (graft->nr_parent == -1 && !parents)
309 ; /* shallow commit */
310 else if (graft->nr_parent != parents)
311 return error_func(&commit->object, FSCK_ERROR, "graft objects missing");
312 } else {
313 struct commit_list *p = commit->parents;
314 while (p && parents) {
315 p = p->next;
316 parents--;
317 }
318 if (p || parents)
319 return error_func(&commit->object, FSCK_ERROR, "parent objects missing");
320 }
Yuxuan Shui2d820a62014-03-13 04:45:51[diff] [blame]321 buffer = skip_prefix(buffer, "author ");
322 if (!buffer)
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]323 return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'author' line");
Jonathan Niederdaae1922010-04-24 16:06:08[diff] [blame]324 err = fsck_ident(&buffer, &commit->object, error_func);
325 if (err)
326 return err;
Yuxuan Shui2d820a62014-03-13 04:45:51[diff] [blame]327 buffer = skip_prefix(buffer, "committer ");
328 if (!buffer)
Jonathan Niederdaae1922010-04-24 16:06:08[diff] [blame]329 return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'committer' line");
Jonathan Niederdaae1922010-04-24 16:06:08[diff] [blame]330 err = fsck_ident(&buffer, &commit->object, error_func);
331 if (err)
332 return err;
Martin Koeglerba002f32008-02-25 21:46:08[diff] [blame]333 if (!commit->tree)
334 return error_func(&commit->object, FSCK_ERROR, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
335
336 return 0;
337}
338
339static int fsck_tag(struct tag *tag, fsck_error error_func)
340{
341 struct object *tagged = tag->tagged;
342
343 if (!tagged)
344 return error_func(&tag->object, FSCK_ERROR, "could not load tagged object");
345 return 0;
346}
347
348int fsck_object(struct object *obj, int strict, fsck_error error_func)
349{
350 if (!obj)
351 return error_func(obj, FSCK_ERROR, "no valid object to fsck");
352
353 if (obj->type == OBJ_BLOB)
354 return 0;
355 if (obj->type == OBJ_TREE)
356 return fsck_tree((struct tree *) obj, strict, error_func);
357 if (obj->type == OBJ_COMMIT)
358 return fsck_commit((struct commit *) obj, error_func);
359 if (obj->type == OBJ_TAG)
360 return fsck_tag((struct tag *) obj, error_func);
361
362 return error_func(obj, FSCK_ERROR, "unknown type '%d' (internal fsck error)",
363 obj->type);
364}
Martin Koeglerd6ffc8d2008-02-25 21:46:09[diff] [blame]365
366int fsck_error_function(struct object *obj, int type, const char *fmt, ...)
367{
368 va_list ap;
Brandon Caseyf285a2d2008-10-09 19:12:12[diff] [blame]369 struct strbuf sb = STRBUF_INIT;
Martin Koeglerd6ffc8d2008-02-25 21:46:09[diff] [blame]370
Jim Meyering5dd56482011-05-26 13:58:16[diff] [blame]371 strbuf_addf(&sb, "object %s:", sha1_to_hex(obj->sha1));
Martin Koeglerd6ffc8d2008-02-25 21:46:09[diff] [blame]372
373 va_start(ap, fmt);
Jeff Kingebeb6092011-02-26 05:08:53[diff] [blame]374 strbuf_vaddf(&sb, fmt, ap);
Martin Koeglerd6ffc8d2008-02-25 21:46:09[diff] [blame]375 va_end(ap);
376
Daniel Lowe9db56f72008-11-10 21:07:52[diff] [blame]377 error("%s", sb.buf);
Martin Koeglerd6ffc8d2008-02-25 21:46:09[diff] [blame]378 strbuf_release(&sb);
379 return 1;
380}