Refactor type_from_string() to allow continuing after detecting an error
[git/git.git] / fsck.c
CommitLineData
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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 {
82247e9b 30 result = error("in tree %s: entry %s has bad mode %.6o",
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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}
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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;
c479d14a 142 int has_null_sha1 = 0;
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143 int has_full_path = 0;
144 int has_empty_name = 0;
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145 int has_dot = 0;
146 int has_dotdot = 0;
5c17f512 147 int has_dotgit = 0;
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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;
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155
156 init_tree_desc(&desc, item->buffer, item->size);
157
158 o_mode = 0;
159 o_name = NULL;
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160
161 while (desc.size) {
162 unsigned mode;
163 const char *name;
c479d14a 164 const unsigned char *sha1;
ba002f3b 165
c479d14a 166 sha1 = tree_entry_extract(&desc, &name, &mode);
ba002f3b 167
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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");
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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;
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214 }
215
216 retval = 0;
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217 if (has_null_sha1)
218 retval += error_func(&item->object, FSCK_WARN, "contains entries pointing to null sha1");
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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");
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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 '..'");
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227 if (has_dotgit)
228 retval += error_func(&item->object, FSCK_WARN, "contains '.git'");
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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
de42180f 240static int fsck_ident(const char **ident, struct object *obj, fsck_error error_func)
daae1922 241{
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242 char *end;
243
53f53cff 244 if (**ident == '<')
daae1922 245 return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
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DI
246 *ident += strcspn(*ident, "<>\n");
247 if (**ident == '>')
248 return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad name");
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249 if (**ident != '<')
250 return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing email");
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251 if ((*ident)[-1] != ' ')
252 return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
daae1922
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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");
7ca36d93 263 if (date_overflows(strtoul(*ident, &end, 10)))
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264 return error_func(obj, FSCK_ERROR, "invalid author/committer line - date causes integer overflow");
265 if (end == *ident || *end != ' ')
daae1922 266 return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad date");
d4b8de04 267 *ident = end + 1;
daae1922
JN
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
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279static int fsck_commit_buffer(struct commit *commit, const char *buffer,
280 fsck_error error_func)
ba002f3b 281{
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282 unsigned char tree_sha1[20], sha1[20];
283 struct commit_graft *graft;
9d02150c 284 unsigned parent_count, parent_line_count = 0;
daae1922 285 int err;
ba002f3b 286
cf4fff57 287 if (!skip_prefix(buffer, "tree ", &buffer))
ba002f3b 288 return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'tree' line");
2d820a61 289 if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n')
ba002f3b 290 return error_func(&commit->object, FSCK_ERROR, "invalid 'tree' line format - bad sha1");
2d820a61 291 buffer += 41;
cf4fff57 292 while (skip_prefix(buffer, "parent ", &buffer)) {
2d820a61 293 if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n')
ba002f3b 294 return error_func(&commit->object, FSCK_ERROR, "invalid 'parent' line format - bad sha1");
2d820a61 295 buffer += 41;
9d02150c 296 parent_line_count++;
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297 }
298 graft = lookup_commit_graft(commit->object.sha1);
9d02150c 299 parent_count = commit_list_count(commit->parents);
ba002f3b 300 if (graft) {
9d02150c 301 if (graft->nr_parent == -1 && !parent_count)
ba002f3b 302 ; /* shallow commit */
9d02150c 303 else if (graft->nr_parent != parent_count)
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304 return error_func(&commit->object, FSCK_ERROR, "graft objects missing");
305 } else {
9d02150c 306 if (parent_count != parent_line_count)
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307 return error_func(&commit->object, FSCK_ERROR, "parent objects missing");
308 }
cf4fff57 309 if (!skip_prefix(buffer, "author ", &buffer))
ba002f3b 310 return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'author' line");
daae1922
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311 err = fsck_ident(&buffer, &commit->object, error_func);
312 if (err)
313 return err;
cf4fff57 314 if (!skip_prefix(buffer, "committer ", &buffer))
daae1922 315 return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'committer' line");
daae1922
JN
316 err = fsck_ident(&buffer, &commit->object, error_func);
317 if (err)
318 return err;
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319 if (!commit->tree)
320 return error_func(&commit->object, FSCK_ERROR, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
321
322 return 0;
323}
324
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325static int fsck_commit(struct commit *commit, fsck_error error_func)
326{
8597ea3a 327 const char *buffer = get_commit_buffer(commit, NULL);
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328 int ret = fsck_commit_buffer(commit, buffer, error_func);
329 unuse_commit_buffer(commit, buffer);
330 return ret;
331}
332
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333static int fsck_tag(struct tag *tag, fsck_error error_func)
334{
335 struct object *tagged = tag->tagged;
336
337 if (!tagged)
338 return error_func(&tag->object, FSCK_ERROR, "could not load tagged object");
339 return 0;
340}
341
342int fsck_object(struct object *obj, int strict, fsck_error error_func)
343{
344 if (!obj)
345 return error_func(obj, FSCK_ERROR, "no valid object to fsck");
346
347 if (obj->type == OBJ_BLOB)
348 return 0;
349 if (obj->type == OBJ_TREE)
350 return fsck_tree((struct tree *) obj, strict, error_func);
351 if (obj->type == OBJ_COMMIT)
352 return fsck_commit((struct commit *) obj, error_func);
353 if (obj->type == OBJ_TAG)
354 return fsck_tag((struct tag *) obj, error_func);
355
356 return error_func(obj, FSCK_ERROR, "unknown type '%d' (internal fsck error)",
357 obj->type);
358}
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359
360int fsck_error_function(struct object *obj, int type, const char *fmt, ...)
361{
362 va_list ap;
f285a2d7 363 struct strbuf sb = STRBUF_INIT;
d6ffc8d7 364
5dd56489 365 strbuf_addf(&sb, "object %s:", sha1_to_hex(obj->sha1));
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366
367 va_start(ap, fmt);
ebeb6090 368 strbuf_vaddf(&sb, fmt, ap);
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369 va_end(ap);
370
9db56f71 371 error("%s", sb.buf);
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372 strbuf_release(&sb);
373 return 1;
374}