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