Sync with 2.18.1
[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 "sha1-array.h"
14 #include "decorate.h"
15 #include "oidset.h"
16 #include "packfile.h"
17 #include "submodule-config.h"
18 #include "config.h"
19 #include "help.h"
20
21 static struct oidset gitmodules_found = OIDSET_INIT;
22 static struct oidset gitmodules_done = OIDSET_INIT;
23
24 #define FSCK_FATAL -1
25 #define FSCK_INFO -2
26
27 #define FOREACH_MSG_ID(FUNC) \
28 /* fatal errors */ \
29 FUNC(NUL_IN_HEADER, FATAL) \
30 FUNC(UNTERMINATED_HEADER, FATAL) \
31 /* errors */ \
32 FUNC(BAD_DATE, ERROR) \
33 FUNC(BAD_DATE_OVERFLOW, ERROR) \
34 FUNC(BAD_EMAIL, ERROR) \
35 FUNC(BAD_NAME, ERROR) \
36 FUNC(BAD_OBJECT_SHA1, ERROR) \
37 FUNC(BAD_PARENT_SHA1, ERROR) \
38 FUNC(BAD_TAG_OBJECT, ERROR) \
39 FUNC(BAD_TIMEZONE, ERROR) \
40 FUNC(BAD_TREE, ERROR) \
41 FUNC(BAD_TREE_SHA1, ERROR) \
42 FUNC(BAD_TYPE, ERROR) \
43 FUNC(DUPLICATE_ENTRIES, ERROR) \
44 FUNC(MISSING_AUTHOR, ERROR) \
45 FUNC(MISSING_COMMITTER, ERROR) \
46 FUNC(MISSING_EMAIL, ERROR) \
47 FUNC(MISSING_GRAFT, ERROR) \
48 FUNC(MISSING_NAME_BEFORE_EMAIL, ERROR) \
49 FUNC(MISSING_OBJECT, ERROR) \
50 FUNC(MISSING_PARENT, ERROR) \
51 FUNC(MISSING_SPACE_BEFORE_DATE, ERROR) \
52 FUNC(MISSING_SPACE_BEFORE_EMAIL, ERROR) \
53 FUNC(MISSING_TAG, ERROR) \
54 FUNC(MISSING_TAG_ENTRY, ERROR) \
55 FUNC(MISSING_TAG_OBJECT, ERROR) \
56 FUNC(MISSING_TREE, ERROR) \
57 FUNC(MISSING_TREE_OBJECT, ERROR) \
58 FUNC(MISSING_TYPE, ERROR) \
59 FUNC(MISSING_TYPE_ENTRY, ERROR) \
60 FUNC(MULTIPLE_AUTHORS, ERROR) \
61 FUNC(TAG_OBJECT_NOT_TAG, ERROR) \
62 FUNC(TREE_NOT_SORTED, ERROR) \
63 FUNC(UNKNOWN_TYPE, ERROR) \
64 FUNC(ZERO_PADDED_DATE, ERROR) \
65 FUNC(GITMODULES_MISSING, ERROR) \
66 FUNC(GITMODULES_BLOB, ERROR) \
67 FUNC(GITMODULES_LARGE, ERROR) \
68 FUNC(GITMODULES_NAME, ERROR) \
69 FUNC(GITMODULES_SYMLINK, ERROR) \
70 FUNC(GITMODULES_URL, ERROR) \
71 FUNC(GITMODULES_PATH, ERROR) \
72 /* warnings */ \
73 FUNC(BAD_FILEMODE, WARN) \
74 FUNC(EMPTY_NAME, WARN) \
75 FUNC(FULL_PATHNAME, WARN) \
76 FUNC(HAS_DOT, WARN) \
77 FUNC(HAS_DOTDOT, WARN) \
78 FUNC(HAS_DOTGIT, WARN) \
79 FUNC(NULL_SHA1, WARN) \
80 FUNC(ZERO_PADDED_FILEMODE, WARN) \
81 FUNC(NUL_IN_COMMIT, WARN) \
82 /* infos (reported as warnings, but ignored by default) */ \
83 FUNC(GITMODULES_PARSE, INFO) \
84 FUNC(BAD_TAG_NAME, INFO) \
85 FUNC(MISSING_TAGGER_ENTRY, INFO)
86
87 #define MSG_ID(id, msg_type) FSCK_MSG_##id,
88 enum fsck_msg_id {
89 FOREACH_MSG_ID(MSG_ID)
90 FSCK_MSG_MAX
91 };
92 #undef MSG_ID
93
94 #define STR(x) #x
95 #define MSG_ID(id, msg_type) { STR(id), NULL, NULL, FSCK_##msg_type },
96 static struct {
97 const char *id_string;
98 const char *downcased;
99 const char *camelcased;
100 int msg_type;
101 } msg_id_info[FSCK_MSG_MAX + 1] = {
102 FOREACH_MSG_ID(MSG_ID)
103 { NULL, NULL, NULL, -1 }
104 };
105 #undef MSG_ID
106
107 static void prepare_msg_ids(void)
108 {
109 int i;
110
111 if (msg_id_info[0].downcased)
112 return;
113
114 /* convert id_string to lower case, without underscores. */
115 for (i = 0; i < FSCK_MSG_MAX; i++) {
116 const char *p = msg_id_info[i].id_string;
117 int len = strlen(p);
118 char *q = xmalloc(len);
119
120 msg_id_info[i].downcased = q;
121 while (*p)
122 if (*p == '_')
123 p++;
124 else
125 *(q)++ = tolower(*(p)++);
126 *q = '\0';
127
128 p = msg_id_info[i].id_string;
129 q = xmalloc(len);
130 msg_id_info[i].camelcased = q;
131 while (*p) {
132 if (*p == '_') {
133 p++;
134 if (*p)
135 *q++ = *p++;
136 } else {
137 *q++ = tolower(*p++);
138 }
139 }
140 *q = '\0';
141 }
142 }
143
144 static int parse_msg_id(const char *text)
145 {
146 int i;
147
148 prepare_msg_ids();
149
150 for (i = 0; i < FSCK_MSG_MAX; i++)
151 if (!strcmp(text, msg_id_info[i].downcased))
152 return i;
153
154 return -1;
155 }
156
157 void list_config_fsck_msg_ids(struct string_list *list, const char *prefix)
158 {
159 int i;
160
161 prepare_msg_ids();
162
163 for (i = 0; i < FSCK_MSG_MAX; i++)
164 list_config_item(list, prefix, msg_id_info[i].camelcased);
165 }
166
167 static int fsck_msg_type(enum fsck_msg_id msg_id,
168 struct fsck_options *options)
169 {
170 int msg_type;
171
172 assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
173
174 if (options->msg_type)
175 msg_type = options->msg_type[msg_id];
176 else {
177 msg_type = msg_id_info[msg_id].msg_type;
178 if (options->strict && msg_type == FSCK_WARN)
179 msg_type = FSCK_ERROR;
180 }
181
182 return msg_type;
183 }
184
185 static void init_skiplist(struct fsck_options *options, const char *path)
186 {
187 static struct oid_array skiplist = OID_ARRAY_INIT;
188 int sorted, fd;
189 char buffer[GIT_MAX_HEXSZ + 1];
190 struct object_id oid;
191
192 if (options->skiplist)
193 sorted = options->skiplist->sorted;
194 else {
195 sorted = 1;
196 options->skiplist = &skiplist;
197 }
198
199 fd = open(path, O_RDONLY);
200 if (fd < 0)
201 die("Could not open skip list: %s", path);
202 for (;;) {
203 const char *p;
204 int result = read_in_full(fd, buffer, sizeof(buffer));
205 if (result < 0)
206 die_errno("Could not read '%s'", path);
207 if (!result)
208 break;
209 if (parse_oid_hex(buffer, &oid, &p) || *p != '\n')
210 die("Invalid SHA-1: %s", buffer);
211 oid_array_append(&skiplist, &oid);
212 if (sorted && skiplist.nr > 1 &&
213 oidcmp(&skiplist.oid[skiplist.nr - 2],
214 &oid) > 0)
215 sorted = 0;
216 }
217 close(fd);
218
219 if (sorted)
220 skiplist.sorted = 1;
221 }
222
223 static int parse_msg_type(const char *str)
224 {
225 if (!strcmp(str, "error"))
226 return FSCK_ERROR;
227 else if (!strcmp(str, "warn"))
228 return FSCK_WARN;
229 else if (!strcmp(str, "ignore"))
230 return FSCK_IGNORE;
231 else
232 die("Unknown fsck message type: '%s'", str);
233 }
234
235 int is_valid_msg_type(const char *msg_id, const char *msg_type)
236 {
237 if (parse_msg_id(msg_id) < 0)
238 return 0;
239 parse_msg_type(msg_type);
240 return 1;
241 }
242
243 void fsck_set_msg_type(struct fsck_options *options,
244 const char *msg_id, const char *msg_type)
245 {
246 int id = parse_msg_id(msg_id), type;
247
248 if (id < 0)
249 die("Unhandled message id: %s", msg_id);
250 type = parse_msg_type(msg_type);
251
252 if (type != FSCK_ERROR && msg_id_info[id].msg_type == FSCK_FATAL)
253 die("Cannot demote %s to %s", msg_id, msg_type);
254
255 if (!options->msg_type) {
256 int i;
257 int *msg_type;
258 ALLOC_ARRAY(msg_type, FSCK_MSG_MAX);
259 for (i = 0; i < FSCK_MSG_MAX; i++)
260 msg_type[i] = fsck_msg_type(i, options);
261 options->msg_type = msg_type;
262 }
263
264 options->msg_type[id] = type;
265 }
266
267 void fsck_set_msg_types(struct fsck_options *options, const char *values)
268 {
269 char *buf = xstrdup(values), *to_free = buf;
270 int done = 0;
271
272 while (!done) {
273 int len = strcspn(buf, " ,|"), equal;
274
275 done = !buf[len];
276 if (!len) {
277 buf++;
278 continue;
279 }
280 buf[len] = '\0';
281
282 for (equal = 0;
283 equal < len && buf[equal] != '=' && buf[equal] != ':';
284 equal++)
285 buf[equal] = tolower(buf[equal]);
286 buf[equal] = '\0';
287
288 if (!strcmp(buf, "skiplist")) {
289 if (equal == len)
290 die("skiplist requires a path");
291 init_skiplist(options, buf + equal + 1);
292 buf += len + 1;
293 continue;
294 }
295
296 if (equal == len)
297 die("Missing '=': '%s'", buf);
298
299 fsck_set_msg_type(options, buf, buf + equal + 1);
300 buf += len + 1;
301 }
302 free(to_free);
303 }
304
305 static void append_msg_id(struct strbuf *sb, const char *msg_id)
306 {
307 for (;;) {
308 char c = *(msg_id)++;
309
310 if (!c)
311 break;
312 if (c != '_')
313 strbuf_addch(sb, tolower(c));
314 else {
315 assert(*msg_id);
316 strbuf_addch(sb, *(msg_id)++);
317 }
318 }
319
320 strbuf_addstr(sb, ": ");
321 }
322
323 static int object_on_skiplist(struct fsck_options *opts, struct object *obj)
324 {
325 if (opts && opts->skiplist && obj)
326 return oid_array_lookup(opts->skiplist, &obj->oid) >= 0;
327 return 0;
328 }
329
330 __attribute__((format (printf, 4, 5)))
331 static int report(struct fsck_options *options, struct object *object,
332 enum fsck_msg_id id, const char *fmt, ...)
333 {
334 va_list ap;
335 struct strbuf sb = STRBUF_INIT;
336 int msg_type = fsck_msg_type(id, options), result;
337
338 if (msg_type == FSCK_IGNORE)
339 return 0;
340
341 if (object_on_skiplist(options, object))
342 return 0;
343
344 if (msg_type == FSCK_FATAL)
345 msg_type = FSCK_ERROR;
346 else if (msg_type == FSCK_INFO)
347 msg_type = FSCK_WARN;
348
349 append_msg_id(&sb, msg_id_info[id].id_string);
350
351 va_start(ap, fmt);
352 strbuf_vaddf(&sb, fmt, ap);
353 result = options->error_func(options, object, msg_type, sb.buf);
354 strbuf_release(&sb);
355 va_end(ap);
356
357 return result;
358 }
359
360 static char *get_object_name(struct fsck_options *options, struct object *obj)
361 {
362 if (!options->object_names)
363 return NULL;
364 return lookup_decoration(options->object_names, obj);
365 }
366
367 static void put_object_name(struct fsck_options *options, struct object *obj,
368 const char *fmt, ...)
369 {
370 va_list ap;
371 struct strbuf buf = STRBUF_INIT;
372 char *existing;
373
374 if (!options->object_names)
375 return;
376 existing = lookup_decoration(options->object_names, obj);
377 if (existing)
378 return;
379 va_start(ap, fmt);
380 strbuf_vaddf(&buf, fmt, ap);
381 add_decoration(options->object_names, obj, strbuf_detach(&buf, NULL));
382 va_end(ap);
383 }
384
385 static const char *describe_object(struct fsck_options *o, struct object *obj)
386 {
387 static struct strbuf buf = STRBUF_INIT;
388 char *name;
389
390 strbuf_reset(&buf);
391 strbuf_addstr(&buf, oid_to_hex(&obj->oid));
392 if (o->object_names && (name = lookup_decoration(o->object_names, obj)))
393 strbuf_addf(&buf, " (%s)", name);
394
395 return buf.buf;
396 }
397
398 static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
399 {
400 struct tree_desc desc;
401 struct name_entry entry;
402 int res = 0;
403 const char *name;
404
405 if (parse_tree(tree))
406 return -1;
407
408 name = get_object_name(options, &tree->object);
409 if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
410 return -1;
411 while (tree_entry_gently(&desc, &entry)) {
412 struct object *obj;
413 int result;
414
415 if (S_ISGITLINK(entry.mode))
416 continue;
417
418 if (S_ISDIR(entry.mode)) {
419 obj = (struct object *)lookup_tree(the_repository, entry.oid);
420 if (name && obj)
421 put_object_name(options, obj, "%s%s/", name,
422 entry.path);
423 result = options->walk(obj, OBJ_TREE, data, options);
424 }
425 else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
426 obj = (struct object *)lookup_blob(the_repository, entry.oid);
427 if (name && obj)
428 put_object_name(options, obj, "%s%s", name,
429 entry.path);
430 result = options->walk(obj, OBJ_BLOB, data, options);
431 }
432 else {
433 result = error("in tree %s: entry %s has bad mode %.6o",
434 describe_object(options, &tree->object), entry.path, entry.mode);
435 }
436 if (result < 0)
437 return result;
438 if (!res)
439 res = result;
440 }
441 return res;
442 }
443
444 static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
445 {
446 int counter = 0, generation = 0, name_prefix_len = 0;
447 struct commit_list *parents;
448 int res;
449 int result;
450 const char *name;
451
452 if (parse_commit(commit))
453 return -1;
454
455 name = get_object_name(options, &commit->object);
456 if (name)
457 put_object_name(options, &get_commit_tree(commit)->object,
458 "%s:", name);
459
460 result = options->walk((struct object *)get_commit_tree(commit),
461 OBJ_TREE, data, options);
462 if (result < 0)
463 return result;
464 res = result;
465
466 parents = commit->parents;
467 if (name && parents) {
468 int len = strlen(name), power;
469
470 if (len && name[len - 1] == '^') {
471 generation = 1;
472 name_prefix_len = len - 1;
473 }
474 else { /* parse ~<generation> suffix */
475 for (generation = 0, power = 1;
476 len && isdigit(name[len - 1]);
477 power *= 10)
478 generation += power * (name[--len] - '0');
479 if (power > 1 && len && name[len - 1] == '~')
480 name_prefix_len = len - 1;
481 }
482 }
483
484 while (parents) {
485 if (name) {
486 struct object *obj = &parents->item->object;
487
488 if (++counter > 1)
489 put_object_name(options, obj, "%s^%d",
490 name, counter);
491 else if (generation > 0)
492 put_object_name(options, obj, "%.*s~%d",
493 name_prefix_len, name, generation + 1);
494 else
495 put_object_name(options, obj, "%s^", name);
496 }
497 result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
498 if (result < 0)
499 return result;
500 if (!res)
501 res = result;
502 parents = parents->next;
503 }
504 return res;
505 }
506
507 static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
508 {
509 char *name = get_object_name(options, &tag->object);
510
511 if (parse_tag(tag))
512 return -1;
513 if (name)
514 put_object_name(options, tag->tagged, "%s", name);
515 return options->walk(tag->tagged, OBJ_ANY, data, options);
516 }
517
518 int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
519 {
520 if (!obj)
521 return -1;
522
523 if (obj->type == OBJ_NONE)
524 parse_object(the_repository, &obj->oid);
525
526 switch (obj->type) {
527 case OBJ_BLOB:
528 return 0;
529 case OBJ_TREE:
530 return fsck_walk_tree((struct tree *)obj, data, options);
531 case OBJ_COMMIT:
532 return fsck_walk_commit((struct commit *)obj, data, options);
533 case OBJ_TAG:
534 return fsck_walk_tag((struct tag *)obj, data, options);
535 default:
536 error("Unknown object type for %s", describe_object(options, obj));
537 return -1;
538 }
539 }
540
541 /*
542 * The entries in a tree are ordered in the _path_ order,
543 * which means that a directory entry is ordered by adding
544 * a slash to the end of it.
545 *
546 * So a directory called "a" is ordered _after_ a file
547 * called "a.c", because "a/" sorts after "a.c".
548 */
549 #define TREE_UNORDERED (-1)
550 #define TREE_HAS_DUPS (-2)
551
552 static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
553 {
554 int len1 = strlen(name1);
555 int len2 = strlen(name2);
556 int len = len1 < len2 ? len1 : len2;
557 unsigned char c1, c2;
558 int cmp;
559
560 cmp = memcmp(name1, name2, len);
561 if (cmp < 0)
562 return 0;
563 if (cmp > 0)
564 return TREE_UNORDERED;
565
566 /*
567 * Ok, the first <len> characters are the same.
568 * Now we need to order the next one, but turn
569 * a '\0' into a '/' for a directory entry.
570 */
571 c1 = name1[len];
572 c2 = name2[len];
573 if (!c1 && !c2)
574 /*
575 * git-write-tree used to write out a nonsense tree that has
576 * entries with the same name, one blob and one tree. Make
577 * sure we do not have duplicate entries.
578 */
579 return TREE_HAS_DUPS;
580 if (!c1 && S_ISDIR(mode1))
581 c1 = '/';
582 if (!c2 && S_ISDIR(mode2))
583 c2 = '/';
584 return c1 < c2 ? 0 : TREE_UNORDERED;
585 }
586
587 static int fsck_tree(struct tree *item, struct fsck_options *options)
588 {
589 int retval = 0;
590 int has_null_sha1 = 0;
591 int has_full_path = 0;
592 int has_empty_name = 0;
593 int has_dot = 0;
594 int has_dotdot = 0;
595 int has_dotgit = 0;
596 int has_zero_pad = 0;
597 int has_bad_modes = 0;
598 int has_dup_entries = 0;
599 int not_properly_sorted = 0;
600 struct tree_desc desc;
601 unsigned o_mode;
602 const char *o_name;
603
604 if (init_tree_desc_gently(&desc, item->buffer, item->size)) {
605 retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
606 return retval;
607 }
608
609 o_mode = 0;
610 o_name = NULL;
611
612 while (desc.size) {
613 unsigned mode;
614 const char *name;
615 const struct object_id *oid;
616
617 oid = tree_entry_extract(&desc, &name, &mode);
618
619 has_null_sha1 |= is_null_oid(oid);
620 has_full_path |= !!strchr(name, '/');
621 has_empty_name |= !*name;
622 has_dot |= !strcmp(name, ".");
623 has_dotdot |= !strcmp(name, "..");
624 has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
625 has_zero_pad |= *(char *)desc.buffer == '0';
626
627 if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name)) {
628 if (!S_ISLNK(mode))
629 oidset_insert(&gitmodules_found, oid);
630 else
631 retval += report(options, &item->object,
632 FSCK_MSG_GITMODULES_SYMLINK,
633 ".gitmodules is a symbolic link");
634 }
635
636 if (update_tree_entry_gently(&desc)) {
637 retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
638 break;
639 }
640
641 switch (mode) {
642 /*
643 * Standard modes..
644 */
645 case S_IFREG | 0755:
646 case S_IFREG | 0644:
647 case S_IFLNK:
648 case S_IFDIR:
649 case S_IFGITLINK:
650 break;
651 /*
652 * This is nonstandard, but we had a few of these
653 * early on when we honored the full set of mode
654 * bits..
655 */
656 case S_IFREG | 0664:
657 if (!options->strict)
658 break;
659 /* fallthrough */
660 default:
661 has_bad_modes = 1;
662 }
663
664 if (o_name) {
665 switch (verify_ordered(o_mode, o_name, mode, name)) {
666 case TREE_UNORDERED:
667 not_properly_sorted = 1;
668 break;
669 case TREE_HAS_DUPS:
670 has_dup_entries = 1;
671 break;
672 default:
673 break;
674 }
675 }
676
677 o_mode = mode;
678 o_name = name;
679 }
680
681 if (has_null_sha1)
682 retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
683 if (has_full_path)
684 retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
685 if (has_empty_name)
686 retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
687 if (has_dot)
688 retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
689 if (has_dotdot)
690 retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
691 if (has_dotgit)
692 retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
693 if (has_zero_pad)
694 retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
695 if (has_bad_modes)
696 retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
697 if (has_dup_entries)
698 retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
699 if (not_properly_sorted)
700 retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
701 return retval;
702 }
703
704 static int verify_headers(const void *data, unsigned long size,
705 struct object *obj, struct fsck_options *options)
706 {
707 const char *buffer = (const char *)data;
708 unsigned long i;
709
710 for (i = 0; i < size; i++) {
711 switch (buffer[i]) {
712 case '\0':
713 return report(options, obj,
714 FSCK_MSG_NUL_IN_HEADER,
715 "unterminated header: NUL at offset %ld", i);
716 case '\n':
717 if (i + 1 < size && buffer[i + 1] == '\n')
718 return 0;
719 }
720 }
721
722 /*
723 * We did not find double-LF that separates the header
724 * and the body. Not having a body is not a crime but
725 * we do want to see the terminating LF for the last header
726 * line.
727 */
728 if (size && buffer[size - 1] == '\n')
729 return 0;
730
731 return report(options, obj,
732 FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
733 }
734
735 static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
736 {
737 const char *p = *ident;
738 char *end;
739
740 *ident = strchrnul(*ident, '\n');
741 if (**ident == '\n')
742 (*ident)++;
743
744 if (*p == '<')
745 return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
746 p += strcspn(p, "<>\n");
747 if (*p == '>')
748 return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
749 if (*p != '<')
750 return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
751 if (p[-1] != ' ')
752 return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
753 p++;
754 p += strcspn(p, "<>\n");
755 if (*p != '>')
756 return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
757 p++;
758 if (*p != ' ')
759 return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
760 p++;
761 if (*p == '0' && p[1] != ' ')
762 return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
763 if (date_overflows(parse_timestamp(p, &end, 10)))
764 return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
765 if ((end == p || *end != ' '))
766 return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
767 p = end + 1;
768 if ((*p != '+' && *p != '-') ||
769 !isdigit(p[1]) ||
770 !isdigit(p[2]) ||
771 !isdigit(p[3]) ||
772 !isdigit(p[4]) ||
773 (p[5] != '\n'))
774 return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
775 p += 6;
776 return 0;
777 }
778
779 static int fsck_commit_buffer(struct commit *commit, const char *buffer,
780 unsigned long size, struct fsck_options *options)
781 {
782 struct object_id tree_oid, oid;
783 struct commit_graft *graft;
784 unsigned parent_count, parent_line_count = 0, author_count;
785 int err;
786 const char *buffer_begin = buffer;
787 const char *p;
788
789 if (verify_headers(buffer, size, &commit->object, options))
790 return -1;
791
792 if (!skip_prefix(buffer, "tree ", &buffer))
793 return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
794 if (parse_oid_hex(buffer, &tree_oid, &p) || *p != '\n') {
795 err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
796 if (err)
797 return err;
798 }
799 buffer = p + 1;
800 while (skip_prefix(buffer, "parent ", &buffer)) {
801 if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
802 err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
803 if (err)
804 return err;
805 }
806 buffer = p + 1;
807 parent_line_count++;
808 }
809 graft = lookup_commit_graft(the_repository, &commit->object.oid);
810 parent_count = commit_list_count(commit->parents);
811 if (graft) {
812 if (graft->nr_parent == -1 && !parent_count)
813 ; /* shallow commit */
814 else if (graft->nr_parent != parent_count) {
815 err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
816 if (err)
817 return err;
818 }
819 } else {
820 if (parent_count != parent_line_count) {
821 err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
822 if (err)
823 return err;
824 }
825 }
826 author_count = 0;
827 while (skip_prefix(buffer, "author ", &buffer)) {
828 author_count++;
829 err = fsck_ident(&buffer, &commit->object, options);
830 if (err)
831 return err;
832 }
833 if (author_count < 1)
834 err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
835 else if (author_count > 1)
836 err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
837 if (err)
838 return err;
839 if (!skip_prefix(buffer, "committer ", &buffer))
840 return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
841 err = fsck_ident(&buffer, &commit->object, options);
842 if (err)
843 return err;
844 if (!get_commit_tree(commit)) {
845 err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", oid_to_hex(&tree_oid));
846 if (err)
847 return err;
848 }
849 if (memchr(buffer_begin, '\0', size)) {
850 err = report(options, &commit->object, FSCK_MSG_NUL_IN_COMMIT,
851 "NUL byte in the commit object body");
852 if (err)
853 return err;
854 }
855 return 0;
856 }
857
858 static int fsck_commit(struct commit *commit, const char *data,
859 unsigned long size, struct fsck_options *options)
860 {
861 const char *buffer = data ? data : get_commit_buffer(commit, &size);
862 int ret = fsck_commit_buffer(commit, buffer, size, options);
863 if (!data)
864 unuse_commit_buffer(commit, buffer);
865 return ret;
866 }
867
868 static int fsck_tag_buffer(struct tag *tag, const char *data,
869 unsigned long size, struct fsck_options *options)
870 {
871 struct object_id oid;
872 int ret = 0;
873 const char *buffer;
874 char *to_free = NULL, *eol;
875 struct strbuf sb = STRBUF_INIT;
876 const char *p;
877
878 if (data)
879 buffer = data;
880 else {
881 enum object_type type;
882
883 buffer = to_free =
884 read_object_file(&tag->object.oid, &type, &size);
885 if (!buffer)
886 return report(options, &tag->object,
887 FSCK_MSG_MISSING_TAG_OBJECT,
888 "cannot read tag object");
889
890 if (type != OBJ_TAG) {
891 ret = report(options, &tag->object,
892 FSCK_MSG_TAG_OBJECT_NOT_TAG,
893 "expected tag got %s",
894 type_name(type));
895 goto done;
896 }
897 }
898
899 ret = verify_headers(buffer, size, &tag->object, options);
900 if (ret)
901 goto done;
902
903 if (!skip_prefix(buffer, "object ", &buffer)) {
904 ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
905 goto done;
906 }
907 if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
908 ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
909 if (ret)
910 goto done;
911 }
912 buffer = p + 1;
913
914 if (!skip_prefix(buffer, "type ", &buffer)) {
915 ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
916 goto done;
917 }
918 eol = strchr(buffer, '\n');
919 if (!eol) {
920 ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
921 goto done;
922 }
923 if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
924 ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
925 if (ret)
926 goto done;
927 buffer = eol + 1;
928
929 if (!skip_prefix(buffer, "tag ", &buffer)) {
930 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
931 goto done;
932 }
933 eol = strchr(buffer, '\n');
934 if (!eol) {
935 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
936 goto done;
937 }
938 strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
939 if (check_refname_format(sb.buf, 0)) {
940 ret = report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
941 "invalid 'tag' name: %.*s",
942 (int)(eol - buffer), buffer);
943 if (ret)
944 goto done;
945 }
946 buffer = eol + 1;
947
948 if (!skip_prefix(buffer, "tagger ", &buffer)) {
949 /* early tags do not contain 'tagger' lines; warn only */
950 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
951 if (ret)
952 goto done;
953 }
954 else
955 ret = fsck_ident(&buffer, &tag->object, options);
956
957 done:
958 strbuf_release(&sb);
959 free(to_free);
960 return ret;
961 }
962
963 static int fsck_tag(struct tag *tag, const char *data,
964 unsigned long size, struct fsck_options *options)
965 {
966 struct object *tagged = tag->tagged;
967
968 if (!tagged)
969 return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
970
971 return fsck_tag_buffer(tag, data, size, options);
972 }
973
974 struct fsck_gitmodules_data {
975 struct object *obj;
976 struct fsck_options *options;
977 int ret;
978 };
979
980 static int fsck_gitmodules_fn(const char *var, const char *value, void *vdata)
981 {
982 struct fsck_gitmodules_data *data = vdata;
983 const char *subsection, *key;
984 int subsection_len;
985 char *name;
986
987 if (parse_config_key(var, "submodule", &subsection, &subsection_len, &key) < 0 ||
988 !subsection)
989 return 0;
990
991 name = xmemdupz(subsection, subsection_len);
992 if (check_submodule_name(name) < 0)
993 data->ret |= report(data->options, data->obj,
994 FSCK_MSG_GITMODULES_NAME,
995 "disallowed submodule name: %s",
996 name);
997 if (!strcmp(key, "url") && value &&
998 looks_like_command_line_option(value))
999 data->ret |= report(data->options, data->obj,
1000 FSCK_MSG_GITMODULES_URL,
1001 "disallowed submodule url: %s",
1002 value);
1003 if (!strcmp(key, "path") && value &&
1004 looks_like_command_line_option(value))
1005 data->ret |= report(data->options, data->obj,
1006 FSCK_MSG_GITMODULES_PATH,
1007 "disallowed submodule path: %s",
1008 value);
1009 free(name);
1010
1011 return 0;
1012 }
1013
1014 static int fsck_blob(struct blob *blob, const char *buf,
1015 unsigned long size, struct fsck_options *options)
1016 {
1017 struct fsck_gitmodules_data data;
1018 struct config_options config_opts = { 0 };
1019
1020 if (!oidset_contains(&gitmodules_found, &blob->object.oid))
1021 return 0;
1022 oidset_insert(&gitmodules_done, &blob->object.oid);
1023
1024 if (object_on_skiplist(options, &blob->object))
1025 return 0;
1026
1027 if (!buf) {
1028 /*
1029 * A missing buffer here is a sign that the caller found the
1030 * blob too gigantic to load into memory. Let's just consider
1031 * that an error.
1032 */
1033 return report(options, &blob->object,
1034 FSCK_MSG_GITMODULES_LARGE,
1035 ".gitmodules too large to parse");
1036 }
1037
1038 data.obj = &blob->object;
1039 data.options = options;
1040 data.ret = 0;
1041 config_opts.error_action = CONFIG_ERROR_SILENT;
1042 if (git_config_from_mem(fsck_gitmodules_fn, CONFIG_ORIGIN_BLOB,
1043 ".gitmodules", buf, size, &data, &config_opts))
1044 data.ret |= report(options, &blob->object,
1045 FSCK_MSG_GITMODULES_PARSE,
1046 "could not parse gitmodules blob");
1047
1048 return data.ret;
1049 }
1050
1051 int fsck_object(struct object *obj, void *data, unsigned long size,
1052 struct fsck_options *options)
1053 {
1054 if (!obj)
1055 return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
1056
1057 if (obj->type == OBJ_BLOB)
1058 return fsck_blob((struct blob *)obj, data, size, options);
1059 if (obj->type == OBJ_TREE)
1060 return fsck_tree((struct tree *) obj, options);
1061 if (obj->type == OBJ_COMMIT)
1062 return fsck_commit((struct commit *) obj, (const char *) data,
1063 size, options);
1064 if (obj->type == OBJ_TAG)
1065 return fsck_tag((struct tag *) obj, (const char *) data,
1066 size, options);
1067
1068 return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
1069 obj->type);
1070 }
1071
1072 int fsck_error_function(struct fsck_options *o,
1073 struct object *obj, int msg_type, const char *message)
1074 {
1075 if (msg_type == FSCK_WARN) {
1076 warning("object %s: %s", describe_object(o, obj), message);
1077 return 0;
1078 }
1079 error("object %s: %s", describe_object(o, obj), message);
1080 return 1;
1081 }
1082
1083 int fsck_finish(struct fsck_options *options)
1084 {
1085 int ret = 0;
1086 struct oidset_iter iter;
1087 const struct object_id *oid;
1088
1089 oidset_iter_init(&gitmodules_found, &iter);
1090 while ((oid = oidset_iter_next(&iter))) {
1091 struct blob *blob;
1092 enum object_type type;
1093 unsigned long size;
1094 char *buf;
1095
1096 if (oidset_contains(&gitmodules_done, oid))
1097 continue;
1098
1099 blob = lookup_blob(the_repository, oid);
1100 if (!blob) {
1101 struct object *obj = lookup_unknown_object(oid->hash);
1102 ret |= report(options, obj,
1103 FSCK_MSG_GITMODULES_BLOB,
1104 "non-blob found at .gitmodules");
1105 continue;
1106 }
1107
1108 buf = read_object_file(oid, &type, &size);
1109 if (!buf) {
1110 if (is_promisor_object(&blob->object.oid))
1111 continue;
1112 ret |= report(options, &blob->object,
1113 FSCK_MSG_GITMODULES_MISSING,
1114 "unable to read .gitmodules blob");
1115 continue;
1116 }
1117
1118 if (type == OBJ_BLOB)
1119 ret |= fsck_blob(blob, buf, size, options);
1120 else
1121 ret |= report(options, &blob->object,
1122 FSCK_MSG_GITMODULES_BLOB,
1123 "non-blob found at .gitmodules");
1124 free(buf);
1125 }
1126
1127
1128 oidset_clear(&gitmodules_found);
1129 oidset_clear(&gitmodules_done);
1130 return ret;
1131 }