Merge branch 'sg/t-helper-gitignore'
[git/git.git] / fsck.c
1 #include "cache.h"
2 #include "object-store.h"
3 #include "repository.h"
4 #include "object.h"
5 #include "blob.h"
6 #include "tree.h"
7 #include "tree-walk.h"
8 #include "commit.h"
9 #include "tag.h"
10 #include "fsck.h"
11 #include "refs.h"
12 #include "utf8.h"
13 #include "decorate.h"
14 #include "oidset.h"
15 #include "packfile.h"
16 #include "submodule-config.h"
17 #include "config.h"
18 #include "help.h"
19
20 static struct oidset gitmodules_found = OIDSET_INIT;
21 static struct oidset gitmodules_done = OIDSET_INIT;
22
23 #define FSCK_FATAL -1
24 #define FSCK_INFO -2
25
26 #define FOREACH_MSG_ID(FUNC) \
27 /* fatal errors */ \
28 FUNC(NUL_IN_HEADER, FATAL) \
29 FUNC(UNTERMINATED_HEADER, FATAL) \
30 /* errors */ \
31 FUNC(BAD_DATE, ERROR) \
32 FUNC(BAD_DATE_OVERFLOW, ERROR) \
33 FUNC(BAD_EMAIL, ERROR) \
34 FUNC(BAD_NAME, ERROR) \
35 FUNC(BAD_OBJECT_SHA1, ERROR) \
36 FUNC(BAD_PARENT_SHA1, ERROR) \
37 FUNC(BAD_TAG_OBJECT, ERROR) \
38 FUNC(BAD_TIMEZONE, ERROR) \
39 FUNC(BAD_TREE, ERROR) \
40 FUNC(BAD_TREE_SHA1, ERROR) \
41 FUNC(BAD_TYPE, ERROR) \
42 FUNC(DUPLICATE_ENTRIES, ERROR) \
43 FUNC(MISSING_AUTHOR, ERROR) \
44 FUNC(MISSING_COMMITTER, ERROR) \
45 FUNC(MISSING_EMAIL, ERROR) \
46 FUNC(MISSING_GRAFT, ERROR) \
47 FUNC(MISSING_NAME_BEFORE_EMAIL, ERROR) \
48 FUNC(MISSING_OBJECT, ERROR) \
49 FUNC(MISSING_PARENT, ERROR) \
50 FUNC(MISSING_SPACE_BEFORE_DATE, ERROR) \
51 FUNC(MISSING_SPACE_BEFORE_EMAIL, ERROR) \
52 FUNC(MISSING_TAG, ERROR) \
53 FUNC(MISSING_TAG_ENTRY, ERROR) \
54 FUNC(MISSING_TAG_OBJECT, ERROR) \
55 FUNC(MISSING_TREE, ERROR) \
56 FUNC(MISSING_TREE_OBJECT, ERROR) \
57 FUNC(MISSING_TYPE, ERROR) \
58 FUNC(MISSING_TYPE_ENTRY, ERROR) \
59 FUNC(MULTIPLE_AUTHORS, ERROR) \
60 FUNC(TAG_OBJECT_NOT_TAG, ERROR) \
61 FUNC(TREE_NOT_SORTED, ERROR) \
62 FUNC(UNKNOWN_TYPE, ERROR) \
63 FUNC(ZERO_PADDED_DATE, ERROR) \
64 FUNC(GITMODULES_MISSING, ERROR) \
65 FUNC(GITMODULES_BLOB, ERROR) \
66 FUNC(GITMODULES_LARGE, ERROR) \
67 FUNC(GITMODULES_NAME, ERROR) \
68 FUNC(GITMODULES_SYMLINK, ERROR) \
69 FUNC(GITMODULES_URL, ERROR) \
70 FUNC(GITMODULES_PATH, ERROR) \
71 /* warnings */ \
72 FUNC(BAD_FILEMODE, WARN) \
73 FUNC(EMPTY_NAME, WARN) \
74 FUNC(FULL_PATHNAME, WARN) \
75 FUNC(HAS_DOT, WARN) \
76 FUNC(HAS_DOTDOT, WARN) \
77 FUNC(HAS_DOTGIT, WARN) \
78 FUNC(NULL_SHA1, WARN) \
79 FUNC(ZERO_PADDED_FILEMODE, WARN) \
80 FUNC(NUL_IN_COMMIT, WARN) \
81 /* infos (reported as warnings, but ignored by default) */ \
82 FUNC(GITMODULES_PARSE, INFO) \
83 FUNC(BAD_TAG_NAME, INFO) \
84 FUNC(MISSING_TAGGER_ENTRY, INFO)
85
86 #define MSG_ID(id, msg_type) FSCK_MSG_##id,
87 enum fsck_msg_id {
88 FOREACH_MSG_ID(MSG_ID)
89 FSCK_MSG_MAX
90 };
91 #undef MSG_ID
92
93 #define STR(x) #x
94 #define MSG_ID(id, msg_type) { STR(id), NULL, NULL, FSCK_##msg_type },
95 static struct {
96 const char *id_string;
97 const char *downcased;
98 const char *camelcased;
99 int msg_type;
100 } msg_id_info[FSCK_MSG_MAX + 1] = {
101 FOREACH_MSG_ID(MSG_ID)
102 { NULL, NULL, NULL, -1 }
103 };
104 #undef MSG_ID
105
106 static void prepare_msg_ids(void)
107 {
108 int i;
109
110 if (msg_id_info[0].downcased)
111 return;
112
113 /* convert id_string to lower case, without underscores. */
114 for (i = 0; i < FSCK_MSG_MAX; i++) {
115 const char *p = msg_id_info[i].id_string;
116 int len = strlen(p);
117 char *q = xmalloc(len);
118
119 msg_id_info[i].downcased = q;
120 while (*p)
121 if (*p == '_')
122 p++;
123 else
124 *(q)++ = tolower(*(p)++);
125 *q = '\0';
126
127 p = msg_id_info[i].id_string;
128 q = xmalloc(len);
129 msg_id_info[i].camelcased = q;
130 while (*p) {
131 if (*p == '_') {
132 p++;
133 if (*p)
134 *q++ = *p++;
135 } else {
136 *q++ = tolower(*p++);
137 }
138 }
139 *q = '\0';
140 }
141 }
142
143 static int parse_msg_id(const char *text)
144 {
145 int i;
146
147 prepare_msg_ids();
148
149 for (i = 0; i < FSCK_MSG_MAX; i++)
150 if (!strcmp(text, msg_id_info[i].downcased))
151 return i;
152
153 return -1;
154 }
155
156 void list_config_fsck_msg_ids(struct string_list *list, const char *prefix)
157 {
158 int i;
159
160 prepare_msg_ids();
161
162 for (i = 0; i < FSCK_MSG_MAX; i++)
163 list_config_item(list, prefix, msg_id_info[i].camelcased);
164 }
165
166 static int fsck_msg_type(enum fsck_msg_id msg_id,
167 struct fsck_options *options)
168 {
169 int msg_type;
170
171 assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
172
173 if (options->msg_type)
174 msg_type = options->msg_type[msg_id];
175 else {
176 msg_type = msg_id_info[msg_id].msg_type;
177 if (options->strict && msg_type == FSCK_WARN)
178 msg_type = FSCK_ERROR;
179 }
180
181 return msg_type;
182 }
183
184 static int parse_msg_type(const char *str)
185 {
186 if (!strcmp(str, "error"))
187 return FSCK_ERROR;
188 else if (!strcmp(str, "warn"))
189 return FSCK_WARN;
190 else if (!strcmp(str, "ignore"))
191 return FSCK_IGNORE;
192 else
193 die("Unknown fsck message type: '%s'", str);
194 }
195
196 int is_valid_msg_type(const char *msg_id, const char *msg_type)
197 {
198 if (parse_msg_id(msg_id) < 0)
199 return 0;
200 parse_msg_type(msg_type);
201 return 1;
202 }
203
204 void fsck_set_msg_type(struct fsck_options *options,
205 const char *msg_id, const char *msg_type)
206 {
207 int id = parse_msg_id(msg_id), type;
208
209 if (id < 0)
210 die("Unhandled message id: %s", msg_id);
211 type = parse_msg_type(msg_type);
212
213 if (type != FSCK_ERROR && msg_id_info[id].msg_type == FSCK_FATAL)
214 die("Cannot demote %s to %s", msg_id, msg_type);
215
216 if (!options->msg_type) {
217 int i;
218 int *msg_type;
219 ALLOC_ARRAY(msg_type, FSCK_MSG_MAX);
220 for (i = 0; i < FSCK_MSG_MAX; i++)
221 msg_type[i] = fsck_msg_type(i, options);
222 options->msg_type = msg_type;
223 }
224
225 options->msg_type[id] = type;
226 }
227
228 void fsck_set_msg_types(struct fsck_options *options, const char *values)
229 {
230 char *buf = xstrdup(values), *to_free = buf;
231 int done = 0;
232
233 while (!done) {
234 int len = strcspn(buf, " ,|"), equal;
235
236 done = !buf[len];
237 if (!len) {
238 buf++;
239 continue;
240 }
241 buf[len] = '\0';
242
243 for (equal = 0;
244 equal < len && buf[equal] != '=' && buf[equal] != ':';
245 equal++)
246 buf[equal] = tolower(buf[equal]);
247 buf[equal] = '\0';
248
249 if (!strcmp(buf, "skiplist")) {
250 if (equal == len)
251 die("skiplist requires a path");
252 oidset_parse_file(&options->skiplist, buf + equal + 1);
253 buf += len + 1;
254 continue;
255 }
256
257 if (equal == len)
258 die("Missing '=': '%s'", buf);
259
260 fsck_set_msg_type(options, buf, buf + equal + 1);
261 buf += len + 1;
262 }
263 free(to_free);
264 }
265
266 static void append_msg_id(struct strbuf *sb, const char *msg_id)
267 {
268 for (;;) {
269 char c = *(msg_id)++;
270
271 if (!c)
272 break;
273 if (c != '_')
274 strbuf_addch(sb, tolower(c));
275 else {
276 assert(*msg_id);
277 strbuf_addch(sb, *(msg_id)++);
278 }
279 }
280
281 strbuf_addstr(sb, ": ");
282 }
283
284 static int object_on_skiplist(struct fsck_options *opts, struct object *obj)
285 {
286 return opts && obj && oidset_contains(&opts->skiplist, &obj->oid);
287 }
288
289 __attribute__((format (printf, 4, 5)))
290 static int report(struct fsck_options *options, struct object *object,
291 enum fsck_msg_id id, const char *fmt, ...)
292 {
293 va_list ap;
294 struct strbuf sb = STRBUF_INIT;
295 int msg_type = fsck_msg_type(id, options), result;
296
297 if (msg_type == FSCK_IGNORE)
298 return 0;
299
300 if (object_on_skiplist(options, object))
301 return 0;
302
303 if (msg_type == FSCK_FATAL)
304 msg_type = FSCK_ERROR;
305 else if (msg_type == FSCK_INFO)
306 msg_type = FSCK_WARN;
307
308 append_msg_id(&sb, msg_id_info[id].id_string);
309
310 va_start(ap, fmt);
311 strbuf_vaddf(&sb, fmt, ap);
312 result = options->error_func(options, object, msg_type, sb.buf);
313 strbuf_release(&sb);
314 va_end(ap);
315
316 return result;
317 }
318
319 static char *get_object_name(struct fsck_options *options, struct object *obj)
320 {
321 if (!options->object_names)
322 return NULL;
323 return lookup_decoration(options->object_names, obj);
324 }
325
326 static void put_object_name(struct fsck_options *options, struct object *obj,
327 const char *fmt, ...)
328 {
329 va_list ap;
330 struct strbuf buf = STRBUF_INIT;
331 char *existing;
332
333 if (!options->object_names)
334 return;
335 existing = lookup_decoration(options->object_names, obj);
336 if (existing)
337 return;
338 va_start(ap, fmt);
339 strbuf_vaddf(&buf, fmt, ap);
340 add_decoration(options->object_names, obj, strbuf_detach(&buf, NULL));
341 va_end(ap);
342 }
343
344 static const char *describe_object(struct fsck_options *o, struct object *obj)
345 {
346 static struct strbuf buf = STRBUF_INIT;
347 char *name;
348
349 strbuf_reset(&buf);
350 strbuf_addstr(&buf, oid_to_hex(&obj->oid));
351 if (o->object_names && (name = lookup_decoration(o->object_names, obj)))
352 strbuf_addf(&buf, " (%s)", name);
353
354 return buf.buf;
355 }
356
357 static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
358 {
359 struct tree_desc desc;
360 struct name_entry entry;
361 int res = 0;
362 const char *name;
363
364 if (parse_tree(tree))
365 return -1;
366
367 name = get_object_name(options, &tree->object);
368 if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
369 return -1;
370 while (tree_entry_gently(&desc, &entry)) {
371 struct object *obj;
372 int result;
373
374 if (S_ISGITLINK(entry.mode))
375 continue;
376
377 if (S_ISDIR(entry.mode)) {
378 obj = (struct object *)lookup_tree(the_repository, &entry.oid);
379 if (name && obj)
380 put_object_name(options, obj, "%s%s/", name,
381 entry.path);
382 result = options->walk(obj, OBJ_TREE, data, options);
383 }
384 else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
385 obj = (struct object *)lookup_blob(the_repository, &entry.oid);
386 if (name && obj)
387 put_object_name(options, obj, "%s%s", name,
388 entry.path);
389 result = options->walk(obj, OBJ_BLOB, data, options);
390 }
391 else {
392 result = error("in tree %s: entry %s has bad mode %.6o",
393 describe_object(options, &tree->object), entry.path, entry.mode);
394 }
395 if (result < 0)
396 return result;
397 if (!res)
398 res = result;
399 }
400 return res;
401 }
402
403 static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
404 {
405 int counter = 0, generation = 0, name_prefix_len = 0;
406 struct commit_list *parents;
407 int res;
408 int result;
409 const char *name;
410
411 if (parse_commit(commit))
412 return -1;
413
414 name = get_object_name(options, &commit->object);
415 if (name)
416 put_object_name(options, &get_commit_tree(commit)->object,
417 "%s:", name);
418
419 result = options->walk((struct object *)get_commit_tree(commit),
420 OBJ_TREE, data, options);
421 if (result < 0)
422 return result;
423 res = result;
424
425 parents = commit->parents;
426 if (name && parents) {
427 int len = strlen(name), power;
428
429 if (len && name[len - 1] == '^') {
430 generation = 1;
431 name_prefix_len = len - 1;
432 }
433 else { /* parse ~<generation> suffix */
434 for (generation = 0, power = 1;
435 len && isdigit(name[len - 1]);
436 power *= 10)
437 generation += power * (name[--len] - '0');
438 if (power > 1 && len && name[len - 1] == '~')
439 name_prefix_len = len - 1;
440 }
441 }
442
443 while (parents) {
444 if (name) {
445 struct object *obj = &parents->item->object;
446
447 if (counter++)
448 put_object_name(options, obj, "%s^%d",
449 name, counter);
450 else if (generation > 0)
451 put_object_name(options, obj, "%.*s~%d",
452 name_prefix_len, name, generation + 1);
453 else
454 put_object_name(options, obj, "%s^", name);
455 }
456 result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
457 if (result < 0)
458 return result;
459 if (!res)
460 res = result;
461 parents = parents->next;
462 }
463 return res;
464 }
465
466 static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
467 {
468 char *name = get_object_name(options, &tag->object);
469
470 if (parse_tag(tag))
471 return -1;
472 if (name)
473 put_object_name(options, tag->tagged, "%s", name);
474 return options->walk(tag->tagged, OBJ_ANY, data, options);
475 }
476
477 int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
478 {
479 if (!obj)
480 return -1;
481
482 if (obj->type == OBJ_NONE)
483 parse_object(the_repository, &obj->oid);
484
485 switch (obj->type) {
486 case OBJ_BLOB:
487 return 0;
488 case OBJ_TREE:
489 return fsck_walk_tree((struct tree *)obj, data, options);
490 case OBJ_COMMIT:
491 return fsck_walk_commit((struct commit *)obj, data, options);
492 case OBJ_TAG:
493 return fsck_walk_tag((struct tag *)obj, data, options);
494 default:
495 error("Unknown object type for %s", describe_object(options, obj));
496 return -1;
497 }
498 }
499
500 /*
501 * The entries in a tree are ordered in the _path_ order,
502 * which means that a directory entry is ordered by adding
503 * a slash to the end of it.
504 *
505 * So a directory called "a" is ordered _after_ a file
506 * called "a.c", because "a/" sorts after "a.c".
507 */
508 #define TREE_UNORDERED (-1)
509 #define TREE_HAS_DUPS (-2)
510
511 static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
512 {
513 int len1 = strlen(name1);
514 int len2 = strlen(name2);
515 int len = len1 < len2 ? len1 : len2;
516 unsigned char c1, c2;
517 int cmp;
518
519 cmp = memcmp(name1, name2, len);
520 if (cmp < 0)
521 return 0;
522 if (cmp > 0)
523 return TREE_UNORDERED;
524
525 /*
526 * Ok, the first <len> characters are the same.
527 * Now we need to order the next one, but turn
528 * a '\0' into a '/' for a directory entry.
529 */
530 c1 = name1[len];
531 c2 = name2[len];
532 if (!c1 && !c2)
533 /*
534 * git-write-tree used to write out a nonsense tree that has
535 * entries with the same name, one blob and one tree. Make
536 * sure we do not have duplicate entries.
537 */
538 return TREE_HAS_DUPS;
539 if (!c1 && S_ISDIR(mode1))
540 c1 = '/';
541 if (!c2 && S_ISDIR(mode2))
542 c2 = '/';
543 return c1 < c2 ? 0 : TREE_UNORDERED;
544 }
545
546 static int fsck_tree(struct tree *item, struct fsck_options *options)
547 {
548 int retval = 0;
549 int has_null_sha1 = 0;
550 int has_full_path = 0;
551 int has_empty_name = 0;
552 int has_dot = 0;
553 int has_dotdot = 0;
554 int has_dotgit = 0;
555 int has_zero_pad = 0;
556 int has_bad_modes = 0;
557 int has_dup_entries = 0;
558 int not_properly_sorted = 0;
559 struct tree_desc desc;
560 unsigned o_mode;
561 const char *o_name;
562
563 if (init_tree_desc_gently(&desc, item->buffer, item->size)) {
564 retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
565 return retval;
566 }
567
568 o_mode = 0;
569 o_name = NULL;
570
571 while (desc.size) {
572 unsigned short mode;
573 const char *name;
574 const struct object_id *oid;
575
576 oid = tree_entry_extract(&desc, &name, &mode);
577
578 has_null_sha1 |= is_null_oid(oid);
579 has_full_path |= !!strchr(name, '/');
580 has_empty_name |= !*name;
581 has_dot |= !strcmp(name, ".");
582 has_dotdot |= !strcmp(name, "..");
583 has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
584 has_zero_pad |= *(char *)desc.buffer == '0';
585
586 if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name)) {
587 if (!S_ISLNK(mode))
588 oidset_insert(&gitmodules_found, oid);
589 else
590 retval += report(options, &item->object,
591 FSCK_MSG_GITMODULES_SYMLINK,
592 ".gitmodules is a symbolic link");
593 }
594
595 if (update_tree_entry_gently(&desc)) {
596 retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
597 break;
598 }
599
600 switch (mode) {
601 /*
602 * Standard modes..
603 */
604 case S_IFREG | 0755:
605 case S_IFREG | 0644:
606 case S_IFLNK:
607 case S_IFDIR:
608 case S_IFGITLINK:
609 break;
610 /*
611 * This is nonstandard, but we had a few of these
612 * early on when we honored the full set of mode
613 * bits..
614 */
615 case S_IFREG | 0664:
616 if (!options->strict)
617 break;
618 /* fallthrough */
619 default:
620 has_bad_modes = 1;
621 }
622
623 if (o_name) {
624 switch (verify_ordered(o_mode, o_name, mode, name)) {
625 case TREE_UNORDERED:
626 not_properly_sorted = 1;
627 break;
628 case TREE_HAS_DUPS:
629 has_dup_entries = 1;
630 break;
631 default:
632 break;
633 }
634 }
635
636 o_mode = mode;
637 o_name = name;
638 }
639
640 if (has_null_sha1)
641 retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
642 if (has_full_path)
643 retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
644 if (has_empty_name)
645 retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
646 if (has_dot)
647 retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
648 if (has_dotdot)
649 retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
650 if (has_dotgit)
651 retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
652 if (has_zero_pad)
653 retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
654 if (has_bad_modes)
655 retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
656 if (has_dup_entries)
657 retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
658 if (not_properly_sorted)
659 retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
660 return retval;
661 }
662
663 static int verify_headers(const void *data, unsigned long size,
664 struct object *obj, struct fsck_options *options)
665 {
666 const char *buffer = (const char *)data;
667 unsigned long i;
668
669 for (i = 0; i < size; i++) {
670 switch (buffer[i]) {
671 case '\0':
672 return report(options, obj,
673 FSCK_MSG_NUL_IN_HEADER,
674 "unterminated header: NUL at offset %ld", i);
675 case '\n':
676 if (i + 1 < size && buffer[i + 1] == '\n')
677 return 0;
678 }
679 }
680
681 /*
682 * We did not find double-LF that separates the header
683 * and the body. Not having a body is not a crime but
684 * we do want to see the terminating LF for the last header
685 * line.
686 */
687 if (size && buffer[size - 1] == '\n')
688 return 0;
689
690 return report(options, obj,
691 FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
692 }
693
694 static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
695 {
696 const char *p = *ident;
697 char *end;
698
699 *ident = strchrnul(*ident, '\n');
700 if (**ident == '\n')
701 (*ident)++;
702
703 if (*p == '<')
704 return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
705 p += strcspn(p, "<>\n");
706 if (*p == '>')
707 return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
708 if (*p != '<')
709 return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
710 if (p[-1] != ' ')
711 return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
712 p++;
713 p += strcspn(p, "<>\n");
714 if (*p != '>')
715 return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
716 p++;
717 if (*p != ' ')
718 return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
719 p++;
720 if (*p == '0' && p[1] != ' ')
721 return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
722 if (date_overflows(parse_timestamp(p, &end, 10)))
723 return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
724 if ((end == p || *end != ' '))
725 return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
726 p = end + 1;
727 if ((*p != '+' && *p != '-') ||
728 !isdigit(p[1]) ||
729 !isdigit(p[2]) ||
730 !isdigit(p[3]) ||
731 !isdigit(p[4]) ||
732 (p[5] != '\n'))
733 return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
734 p += 6;
735 return 0;
736 }
737
738 static int fsck_commit_buffer(struct commit *commit, const char *buffer,
739 unsigned long size, struct fsck_options *options)
740 {
741 struct object_id tree_oid, oid;
742 struct commit_graft *graft;
743 unsigned parent_count, parent_line_count = 0, author_count;
744 int err;
745 const char *buffer_begin = buffer;
746 const char *p;
747
748 if (verify_headers(buffer, size, &commit->object, options))
749 return -1;
750
751 if (!skip_prefix(buffer, "tree ", &buffer))
752 return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
753 if (parse_oid_hex(buffer, &tree_oid, &p) || *p != '\n') {
754 err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
755 if (err)
756 return err;
757 }
758 buffer = p + 1;
759 while (skip_prefix(buffer, "parent ", &buffer)) {
760 if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
761 err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
762 if (err)
763 return err;
764 }
765 buffer = p + 1;
766 parent_line_count++;
767 }
768 graft = lookup_commit_graft(the_repository, &commit->object.oid);
769 parent_count = commit_list_count(commit->parents);
770 if (graft) {
771 if (graft->nr_parent == -1 && !parent_count)
772 ; /* shallow commit */
773 else if (graft->nr_parent != parent_count) {
774 err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
775 if (err)
776 return err;
777 }
778 } else {
779 if (parent_count != parent_line_count) {
780 err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
781 if (err)
782 return err;
783 }
784 }
785 author_count = 0;
786 while (skip_prefix(buffer, "author ", &buffer)) {
787 author_count++;
788 err = fsck_ident(&buffer, &commit->object, options);
789 if (err)
790 return err;
791 }
792 if (author_count < 1)
793 err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
794 else if (author_count > 1)
795 err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
796 if (err)
797 return err;
798 if (!skip_prefix(buffer, "committer ", &buffer))
799 return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
800 err = fsck_ident(&buffer, &commit->object, options);
801 if (err)
802 return err;
803 if (!get_commit_tree(commit)) {
804 err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", oid_to_hex(&tree_oid));
805 if (err)
806 return err;
807 }
808 if (memchr(buffer_begin, '\0', size)) {
809 err = report(options, &commit->object, FSCK_MSG_NUL_IN_COMMIT,
810 "NUL byte in the commit object body");
811 if (err)
812 return err;
813 }
814 return 0;
815 }
816
817 static int fsck_commit(struct commit *commit, const char *data,
818 unsigned long size, struct fsck_options *options)
819 {
820 const char *buffer = data ? data : get_commit_buffer(commit, &size);
821 int ret = fsck_commit_buffer(commit, buffer, size, options);
822 if (!data)
823 unuse_commit_buffer(commit, buffer);
824 return ret;
825 }
826
827 static int fsck_tag_buffer(struct tag *tag, const char *data,
828 unsigned long size, struct fsck_options *options)
829 {
830 struct object_id oid;
831 int ret = 0;
832 const char *buffer;
833 char *to_free = NULL, *eol;
834 struct strbuf sb = STRBUF_INIT;
835 const char *p;
836
837 if (data)
838 buffer = data;
839 else {
840 enum object_type type;
841
842 buffer = to_free =
843 read_object_file(&tag->object.oid, &type, &size);
844 if (!buffer)
845 return report(options, &tag->object,
846 FSCK_MSG_MISSING_TAG_OBJECT,
847 "cannot read tag object");
848
849 if (type != OBJ_TAG) {
850 ret = report(options, &tag->object,
851 FSCK_MSG_TAG_OBJECT_NOT_TAG,
852 "expected tag got %s",
853 type_name(type));
854 goto done;
855 }
856 }
857
858 ret = verify_headers(buffer, size, &tag->object, options);
859 if (ret)
860 goto done;
861
862 if (!skip_prefix(buffer, "object ", &buffer)) {
863 ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
864 goto done;
865 }
866 if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
867 ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
868 if (ret)
869 goto done;
870 }
871 buffer = p + 1;
872
873 if (!skip_prefix(buffer, "type ", &buffer)) {
874 ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
875 goto done;
876 }
877 eol = strchr(buffer, '\n');
878 if (!eol) {
879 ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
880 goto done;
881 }
882 if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
883 ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
884 if (ret)
885 goto done;
886 buffer = eol + 1;
887
888 if (!skip_prefix(buffer, "tag ", &buffer)) {
889 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
890 goto done;
891 }
892 eol = strchr(buffer, '\n');
893 if (!eol) {
894 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
895 goto done;
896 }
897 strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
898 if (check_refname_format(sb.buf, 0)) {
899 ret = report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
900 "invalid 'tag' name: %.*s",
901 (int)(eol - buffer), buffer);
902 if (ret)
903 goto done;
904 }
905 buffer = eol + 1;
906
907 if (!skip_prefix(buffer, "tagger ", &buffer)) {
908 /* early tags do not contain 'tagger' lines; warn only */
909 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
910 if (ret)
911 goto done;
912 }
913 else
914 ret = fsck_ident(&buffer, &tag->object, options);
915
916 done:
917 strbuf_release(&sb);
918 free(to_free);
919 return ret;
920 }
921
922 static int fsck_tag(struct tag *tag, const char *data,
923 unsigned long size, struct fsck_options *options)
924 {
925 struct object *tagged = tag->tagged;
926
927 if (!tagged)
928 return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
929
930 return fsck_tag_buffer(tag, data, size, options);
931 }
932
933 struct fsck_gitmodules_data {
934 struct object *obj;
935 struct fsck_options *options;
936 int ret;
937 };
938
939 static int fsck_gitmodules_fn(const char *var, const char *value, void *vdata)
940 {
941 struct fsck_gitmodules_data *data = vdata;
942 const char *subsection, *key;
943 int subsection_len;
944 char *name;
945
946 if (parse_config_key(var, "submodule", &subsection, &subsection_len, &key) < 0 ||
947 !subsection)
948 return 0;
949
950 name = xmemdupz(subsection, subsection_len);
951 if (check_submodule_name(name) < 0)
952 data->ret |= report(data->options, data->obj,
953 FSCK_MSG_GITMODULES_NAME,
954 "disallowed submodule name: %s",
955 name);
956 if (!strcmp(key, "url") && value &&
957 looks_like_command_line_option(value))
958 data->ret |= report(data->options, data->obj,
959 FSCK_MSG_GITMODULES_URL,
960 "disallowed submodule url: %s",
961 value);
962 if (!strcmp(key, "path") && value &&
963 looks_like_command_line_option(value))
964 data->ret |= report(data->options, data->obj,
965 FSCK_MSG_GITMODULES_PATH,
966 "disallowed submodule path: %s",
967 value);
968 free(name);
969
970 return 0;
971 }
972
973 static int fsck_blob(struct blob *blob, const char *buf,
974 unsigned long size, struct fsck_options *options)
975 {
976 struct fsck_gitmodules_data data;
977 struct config_options config_opts = { 0 };
978
979 if (!oidset_contains(&gitmodules_found, &blob->object.oid))
980 return 0;
981 oidset_insert(&gitmodules_done, &blob->object.oid);
982
983 if (object_on_skiplist(options, &blob->object))
984 return 0;
985
986 if (!buf) {
987 /*
988 * A missing buffer here is a sign that the caller found the
989 * blob too gigantic to load into memory. Let's just consider
990 * that an error.
991 */
992 return report(options, &blob->object,
993 FSCK_MSG_GITMODULES_LARGE,
994 ".gitmodules too large to parse");
995 }
996
997 data.obj = &blob->object;
998 data.options = options;
999 data.ret = 0;
1000 config_opts.error_action = CONFIG_ERROR_SILENT;
1001 if (git_config_from_mem(fsck_gitmodules_fn, CONFIG_ORIGIN_BLOB,
1002 ".gitmodules", buf, size, &data, &config_opts))
1003 data.ret |= report(options, &blob->object,
1004 FSCK_MSG_GITMODULES_PARSE,
1005 "could not parse gitmodules blob");
1006
1007 return data.ret;
1008 }
1009
1010 int fsck_object(struct object *obj, void *data, unsigned long size,
1011 struct fsck_options *options)
1012 {
1013 if (!obj)
1014 return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
1015
1016 if (obj->type == OBJ_BLOB)
1017 return fsck_blob((struct blob *)obj, data, size, options);
1018 if (obj->type == OBJ_TREE)
1019 return fsck_tree((struct tree *) obj, options);
1020 if (obj->type == OBJ_COMMIT)
1021 return fsck_commit((struct commit *) obj, (const char *) data,
1022 size, options);
1023 if (obj->type == OBJ_TAG)
1024 return fsck_tag((struct tag *) obj, (const char *) data,
1025 size, options);
1026
1027 return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
1028 obj->type);
1029 }
1030
1031 int fsck_error_function(struct fsck_options *o,
1032 struct object *obj, int msg_type, const char *message)
1033 {
1034 if (msg_type == FSCK_WARN) {
1035 warning("object %s: %s", describe_object(o, obj), message);
1036 return 0;
1037 }
1038 error("object %s: %s", describe_object(o, obj), message);
1039 return 1;
1040 }
1041
1042 int fsck_finish(struct fsck_options *options)
1043 {
1044 int ret = 0;
1045 struct oidset_iter iter;
1046 const struct object_id *oid;
1047
1048 oidset_iter_init(&gitmodules_found, &iter);
1049 while ((oid = oidset_iter_next(&iter))) {
1050 struct blob *blob;
1051 enum object_type type;
1052 unsigned long size;
1053 char *buf;
1054
1055 if (oidset_contains(&gitmodules_done, oid))
1056 continue;
1057
1058 blob = lookup_blob(the_repository, oid);
1059 if (!blob) {
1060 struct object *obj = lookup_unknown_object(oid);
1061 ret |= report(options, obj,
1062 FSCK_MSG_GITMODULES_BLOB,
1063 "non-blob found at .gitmodules");
1064 continue;
1065 }
1066
1067 buf = read_object_file(oid, &type, &size);
1068 if (!buf) {
1069 if (is_promisor_object(&blob->object.oid))
1070 continue;
1071 ret |= report(options, &blob->object,
1072 FSCK_MSG_GITMODULES_MISSING,
1073 "unable to read .gitmodules blob");
1074 continue;
1075 }
1076
1077 if (type == OBJ_BLOB)
1078 ret |= fsck_blob(blob, buf, size, options);
1079 else
1080 ret |= report(options, &blob->object,
1081 FSCK_MSG_GITMODULES_BLOB,
1082 "non-blob found at .gitmodules");
1083 free(buf);
1084 }
1085
1086
1087 oidset_clear(&gitmodules_found);
1088 oidset_clear(&gitmodules_done);
1089 return ret;
1090 }