Merge branch 'jk/interpret-branch-name'
[git/git.git] / fsck.c
1 #include "cache.h"
2 #include "object.h"
3 #include "blob.h"
4 #include "tree.h"
5 #include "tree-walk.h"
6 #include "commit.h"
7 #include "tag.h"
8 #include "fsck.h"
9 #include "refs.h"
10 #include "utf8.h"
11 #include "sha1-array.h"
12 #include "decorate.h"
13
14 #define FSCK_FATAL -1
15 #define FSCK_INFO -2
16
17 #define FOREACH_MSG_ID(FUNC) \
18 /* fatal errors */ \
19 FUNC(NUL_IN_HEADER, FATAL) \
20 FUNC(UNTERMINATED_HEADER, FATAL) \
21 /* errors */ \
22 FUNC(BAD_DATE, ERROR) \
23 FUNC(BAD_DATE_OVERFLOW, ERROR) \
24 FUNC(BAD_EMAIL, ERROR) \
25 FUNC(BAD_NAME, ERROR) \
26 FUNC(BAD_OBJECT_SHA1, ERROR) \
27 FUNC(BAD_PARENT_SHA1, ERROR) \
28 FUNC(BAD_TAG_OBJECT, ERROR) \
29 FUNC(BAD_TIMEZONE, ERROR) \
30 FUNC(BAD_TREE, ERROR) \
31 FUNC(BAD_TREE_SHA1, ERROR) \
32 FUNC(BAD_TYPE, ERROR) \
33 FUNC(DUPLICATE_ENTRIES, ERROR) \
34 FUNC(MISSING_AUTHOR, ERROR) \
35 FUNC(MISSING_COMMITTER, ERROR) \
36 FUNC(MISSING_EMAIL, ERROR) \
37 FUNC(MISSING_GRAFT, ERROR) \
38 FUNC(MISSING_NAME_BEFORE_EMAIL, ERROR) \
39 FUNC(MISSING_OBJECT, ERROR) \
40 FUNC(MISSING_PARENT, ERROR) \
41 FUNC(MISSING_SPACE_BEFORE_DATE, ERROR) \
42 FUNC(MISSING_SPACE_BEFORE_EMAIL, ERROR) \
43 FUNC(MISSING_TAG, ERROR) \
44 FUNC(MISSING_TAG_ENTRY, ERROR) \
45 FUNC(MISSING_TAG_OBJECT, ERROR) \
46 FUNC(MISSING_TREE, ERROR) \
47 FUNC(MISSING_TYPE, ERROR) \
48 FUNC(MISSING_TYPE_ENTRY, ERROR) \
49 FUNC(MULTIPLE_AUTHORS, ERROR) \
50 FUNC(TAG_OBJECT_NOT_TAG, ERROR) \
51 FUNC(TREE_NOT_SORTED, ERROR) \
52 FUNC(UNKNOWN_TYPE, ERROR) \
53 FUNC(ZERO_PADDED_DATE, ERROR) \
54 /* warnings */ \
55 FUNC(BAD_FILEMODE, WARN) \
56 FUNC(EMPTY_NAME, WARN) \
57 FUNC(FULL_PATHNAME, WARN) \
58 FUNC(HAS_DOT, WARN) \
59 FUNC(HAS_DOTDOT, WARN) \
60 FUNC(HAS_DOTGIT, WARN) \
61 FUNC(NULL_SHA1, WARN) \
62 FUNC(ZERO_PADDED_FILEMODE, WARN) \
63 FUNC(NUL_IN_COMMIT, WARN) \
64 /* infos (reported as warnings, but ignored by default) */ \
65 FUNC(BAD_TAG_NAME, INFO) \
66 FUNC(MISSING_TAGGER_ENTRY, INFO)
67
68 #define MSG_ID(id, msg_type) FSCK_MSG_##id,
69 enum fsck_msg_id {
70 FOREACH_MSG_ID(MSG_ID)
71 FSCK_MSG_MAX
72 };
73 #undef MSG_ID
74
75 #define STR(x) #x
76 #define MSG_ID(id, msg_type) { STR(id), NULL, FSCK_##msg_type },
77 static struct {
78 const char *id_string;
79 const char *downcased;
80 int msg_type;
81 } msg_id_info[FSCK_MSG_MAX + 1] = {
82 FOREACH_MSG_ID(MSG_ID)
83 { NULL, NULL, -1 }
84 };
85 #undef MSG_ID
86
87 static int parse_msg_id(const char *text)
88 {
89 int i;
90
91 if (!msg_id_info[0].downcased) {
92 /* convert id_string to lower case, without underscores. */
93 for (i = 0; i < FSCK_MSG_MAX; i++) {
94 const char *p = msg_id_info[i].id_string;
95 int len = strlen(p);
96 char *q = xmalloc(len);
97
98 msg_id_info[i].downcased = q;
99 while (*p)
100 if (*p == '_')
101 p++;
102 else
103 *(q)++ = tolower(*(p)++);
104 *q = '\0';
105 }
106 }
107
108 for (i = 0; i < FSCK_MSG_MAX; i++)
109 if (!strcmp(text, msg_id_info[i].downcased))
110 return i;
111
112 return -1;
113 }
114
115 static int fsck_msg_type(enum fsck_msg_id msg_id,
116 struct fsck_options *options)
117 {
118 int msg_type;
119
120 assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
121
122 if (options->msg_type)
123 msg_type = options->msg_type[msg_id];
124 else {
125 msg_type = msg_id_info[msg_id].msg_type;
126 if (options->strict && msg_type == FSCK_WARN)
127 msg_type = FSCK_ERROR;
128 }
129
130 return msg_type;
131 }
132
133 static void init_skiplist(struct fsck_options *options, const char *path)
134 {
135 static struct sha1_array skiplist = SHA1_ARRAY_INIT;
136 int sorted, fd;
137 char buffer[41];
138 unsigned char sha1[20];
139
140 if (options->skiplist)
141 sorted = options->skiplist->sorted;
142 else {
143 sorted = 1;
144 options->skiplist = &skiplist;
145 }
146
147 fd = open(path, O_RDONLY);
148 if (fd < 0)
149 die("Could not open skip list: %s", path);
150 for (;;) {
151 int result = read_in_full(fd, buffer, sizeof(buffer));
152 if (result < 0)
153 die_errno("Could not read '%s'", path);
154 if (!result)
155 break;
156 if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n')
157 die("Invalid SHA-1: %s", buffer);
158 sha1_array_append(&skiplist, sha1);
159 if (sorted && skiplist.nr > 1 &&
160 hashcmp(skiplist.sha1[skiplist.nr - 2],
161 sha1) > 0)
162 sorted = 0;
163 }
164 close(fd);
165
166 if (sorted)
167 skiplist.sorted = 1;
168 }
169
170 static int parse_msg_type(const char *str)
171 {
172 if (!strcmp(str, "error"))
173 return FSCK_ERROR;
174 else if (!strcmp(str, "warn"))
175 return FSCK_WARN;
176 else if (!strcmp(str, "ignore"))
177 return FSCK_IGNORE;
178 else
179 die("Unknown fsck message type: '%s'", str);
180 }
181
182 int is_valid_msg_type(const char *msg_id, const char *msg_type)
183 {
184 if (parse_msg_id(msg_id) < 0)
185 return 0;
186 parse_msg_type(msg_type);
187 return 1;
188 }
189
190 void fsck_set_msg_type(struct fsck_options *options,
191 const char *msg_id, const char *msg_type)
192 {
193 int id = parse_msg_id(msg_id), type;
194
195 if (id < 0)
196 die("Unhandled message id: %s", msg_id);
197 type = parse_msg_type(msg_type);
198
199 if (type != FSCK_ERROR && msg_id_info[id].msg_type == FSCK_FATAL)
200 die("Cannot demote %s to %s", msg_id, msg_type);
201
202 if (!options->msg_type) {
203 int i;
204 int *msg_type;
205 ALLOC_ARRAY(msg_type, FSCK_MSG_MAX);
206 for (i = 0; i < FSCK_MSG_MAX; i++)
207 msg_type[i] = fsck_msg_type(i, options);
208 options->msg_type = msg_type;
209 }
210
211 options->msg_type[id] = type;
212 }
213
214 void fsck_set_msg_types(struct fsck_options *options, const char *values)
215 {
216 char *buf = xstrdup(values), *to_free = buf;
217 int done = 0;
218
219 while (!done) {
220 int len = strcspn(buf, " ,|"), equal;
221
222 done = !buf[len];
223 if (!len) {
224 buf++;
225 continue;
226 }
227 buf[len] = '\0';
228
229 for (equal = 0;
230 equal < len && buf[equal] != '=' && buf[equal] != ':';
231 equal++)
232 buf[equal] = tolower(buf[equal]);
233 buf[equal] = '\0';
234
235 if (!strcmp(buf, "skiplist")) {
236 if (equal == len)
237 die("skiplist requires a path");
238 init_skiplist(options, buf + equal + 1);
239 buf += len + 1;
240 continue;
241 }
242
243 if (equal == len)
244 die("Missing '=': '%s'", buf);
245
246 fsck_set_msg_type(options, buf, buf + equal + 1);
247 buf += len + 1;
248 }
249 free(to_free);
250 }
251
252 static void append_msg_id(struct strbuf *sb, const char *msg_id)
253 {
254 for (;;) {
255 char c = *(msg_id)++;
256
257 if (!c)
258 break;
259 if (c != '_')
260 strbuf_addch(sb, tolower(c));
261 else {
262 assert(*msg_id);
263 strbuf_addch(sb, *(msg_id)++);
264 }
265 }
266
267 strbuf_addstr(sb, ": ");
268 }
269
270 __attribute__((format (printf, 4, 5)))
271 static int report(struct fsck_options *options, struct object *object,
272 enum fsck_msg_id id, const char *fmt, ...)
273 {
274 va_list ap;
275 struct strbuf sb = STRBUF_INIT;
276 int msg_type = fsck_msg_type(id, options), result;
277
278 if (msg_type == FSCK_IGNORE)
279 return 0;
280
281 if (options->skiplist && object &&
282 sha1_array_lookup(options->skiplist, object->oid.hash) >= 0)
283 return 0;
284
285 if (msg_type == FSCK_FATAL)
286 msg_type = FSCK_ERROR;
287 else if (msg_type == FSCK_INFO)
288 msg_type = FSCK_WARN;
289
290 append_msg_id(&sb, msg_id_info[id].id_string);
291
292 va_start(ap, fmt);
293 strbuf_vaddf(&sb, fmt, ap);
294 result = options->error_func(options, object, msg_type, sb.buf);
295 strbuf_release(&sb);
296 va_end(ap);
297
298 return result;
299 }
300
301 static char *get_object_name(struct fsck_options *options, struct object *obj)
302 {
303 if (!options->object_names)
304 return NULL;
305 return lookup_decoration(options->object_names, obj);
306 }
307
308 static void put_object_name(struct fsck_options *options, struct object *obj,
309 const char *fmt, ...)
310 {
311 va_list ap;
312 struct strbuf buf = STRBUF_INIT;
313 char *existing;
314
315 if (!options->object_names)
316 return;
317 existing = lookup_decoration(options->object_names, obj);
318 if (existing)
319 return;
320 va_start(ap, fmt);
321 strbuf_vaddf(&buf, fmt, ap);
322 add_decoration(options->object_names, obj, strbuf_detach(&buf, NULL));
323 va_end(ap);
324 }
325
326 static const char *describe_object(struct fsck_options *o, struct object *obj)
327 {
328 static struct strbuf buf = STRBUF_INIT;
329 char *name;
330
331 strbuf_reset(&buf);
332 strbuf_addstr(&buf, oid_to_hex(&obj->oid));
333 if (o->object_names && (name = lookup_decoration(o->object_names, obj)))
334 strbuf_addf(&buf, " (%s)", name);
335
336 return buf.buf;
337 }
338
339 static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
340 {
341 struct tree_desc desc;
342 struct name_entry entry;
343 int res = 0;
344 const char *name;
345
346 if (parse_tree(tree))
347 return -1;
348
349 name = get_object_name(options, &tree->object);
350 if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
351 return -1;
352 while (tree_entry_gently(&desc, &entry)) {
353 struct object *obj;
354 int result;
355
356 if (S_ISGITLINK(entry.mode))
357 continue;
358
359 if (S_ISDIR(entry.mode)) {
360 obj = &lookup_tree(entry.oid->hash)->object;
361 if (name)
362 put_object_name(options, obj, "%s%s/", name,
363 entry.path);
364 result = options->walk(obj, OBJ_TREE, data, options);
365 }
366 else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
367 obj = &lookup_blob(entry.oid->hash)->object;
368 if (name)
369 put_object_name(options, obj, "%s%s", name,
370 entry.path);
371 result = options->walk(obj, OBJ_BLOB, data, options);
372 }
373 else {
374 result = error("in tree %s: entry %s has bad mode %.6o",
375 describe_object(options, &tree->object), entry.path, entry.mode);
376 }
377 if (result < 0)
378 return result;
379 if (!res)
380 res = result;
381 }
382 return res;
383 }
384
385 static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
386 {
387 int counter = 0, generation = 0, name_prefix_len = 0;
388 struct commit_list *parents;
389 int res;
390 int result;
391 const char *name;
392
393 if (parse_commit(commit))
394 return -1;
395
396 name = get_object_name(options, &commit->object);
397 if (name)
398 put_object_name(options, &commit->tree->object, "%s:", name);
399
400 result = options->walk((struct object *)commit->tree, OBJ_TREE, data, options);
401 if (result < 0)
402 return result;
403 res = result;
404
405 parents = commit->parents;
406 if (name && parents) {
407 int len = strlen(name), power;
408
409 if (len && name[len - 1] == '^') {
410 generation = 1;
411 name_prefix_len = len - 1;
412 }
413 else { /* parse ~<generation> suffix */
414 for (generation = 0, power = 1;
415 len && isdigit(name[len - 1]);
416 power *= 10)
417 generation += power * (name[--len] - '0');
418 if (power > 1 && len && name[len - 1] == '~')
419 name_prefix_len = len - 1;
420 }
421 }
422
423 while (parents) {
424 if (name) {
425 struct object *obj = &parents->item->object;
426
427 if (++counter > 1)
428 put_object_name(options, obj, "%s^%d",
429 name, counter);
430 else if (generation > 0)
431 put_object_name(options, obj, "%.*s~%d",
432 name_prefix_len, name, generation + 1);
433 else
434 put_object_name(options, obj, "%s^", name);
435 }
436 result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
437 if (result < 0)
438 return result;
439 if (!res)
440 res = result;
441 parents = parents->next;
442 }
443 return res;
444 }
445
446 static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
447 {
448 char *name = get_object_name(options, &tag->object);
449
450 if (parse_tag(tag))
451 return -1;
452 if (name)
453 put_object_name(options, tag->tagged, "%s", name);
454 return options->walk(tag->tagged, OBJ_ANY, data, options);
455 }
456
457 int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
458 {
459 if (!obj)
460 return -1;
461
462 if (obj->type == OBJ_NONE)
463 parse_object(obj->oid.hash);
464
465 switch (obj->type) {
466 case OBJ_BLOB:
467 return 0;
468 case OBJ_TREE:
469 return fsck_walk_tree((struct tree *)obj, data, options);
470 case OBJ_COMMIT:
471 return fsck_walk_commit((struct commit *)obj, data, options);
472 case OBJ_TAG:
473 return fsck_walk_tag((struct tag *)obj, data, options);
474 default:
475 error("Unknown object type for %s", describe_object(options, obj));
476 return -1;
477 }
478 }
479
480 /*
481 * The entries in a tree are ordered in the _path_ order,
482 * which means that a directory entry is ordered by adding
483 * a slash to the end of it.
484 *
485 * So a directory called "a" is ordered _after_ a file
486 * called "a.c", because "a/" sorts after "a.c".
487 */
488 #define TREE_UNORDERED (-1)
489 #define TREE_HAS_DUPS (-2)
490
491 static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
492 {
493 int len1 = strlen(name1);
494 int len2 = strlen(name2);
495 int len = len1 < len2 ? len1 : len2;
496 unsigned char c1, c2;
497 int cmp;
498
499 cmp = memcmp(name1, name2, len);
500 if (cmp < 0)
501 return 0;
502 if (cmp > 0)
503 return TREE_UNORDERED;
504
505 /*
506 * Ok, the first <len> characters are the same.
507 * Now we need to order the next one, but turn
508 * a '\0' into a '/' for a directory entry.
509 */
510 c1 = name1[len];
511 c2 = name2[len];
512 if (!c1 && !c2)
513 /*
514 * git-write-tree used to write out a nonsense tree that has
515 * entries with the same name, one blob and one tree. Make
516 * sure we do not have duplicate entries.
517 */
518 return TREE_HAS_DUPS;
519 if (!c1 && S_ISDIR(mode1))
520 c1 = '/';
521 if (!c2 && S_ISDIR(mode2))
522 c2 = '/';
523 return c1 < c2 ? 0 : TREE_UNORDERED;
524 }
525
526 static int fsck_tree(struct tree *item, struct fsck_options *options)
527 {
528 int retval = 0;
529 int has_null_sha1 = 0;
530 int has_full_path = 0;
531 int has_empty_name = 0;
532 int has_dot = 0;
533 int has_dotdot = 0;
534 int has_dotgit = 0;
535 int has_zero_pad = 0;
536 int has_bad_modes = 0;
537 int has_dup_entries = 0;
538 int not_properly_sorted = 0;
539 struct tree_desc desc;
540 unsigned o_mode;
541 const char *o_name;
542
543 if (init_tree_desc_gently(&desc, item->buffer, item->size)) {
544 retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
545 return retval;
546 }
547
548 o_mode = 0;
549 o_name = NULL;
550
551 while (desc.size) {
552 unsigned mode;
553 const char *name;
554 const struct object_id *oid;
555
556 oid = tree_entry_extract(&desc, &name, &mode);
557
558 has_null_sha1 |= is_null_oid(oid);
559 has_full_path |= !!strchr(name, '/');
560 has_empty_name |= !*name;
561 has_dot |= !strcmp(name, ".");
562 has_dotdot |= !strcmp(name, "..");
563 has_dotgit |= (!strcmp(name, ".git") ||
564 is_hfs_dotgit(name) ||
565 is_ntfs_dotgit(name));
566 has_zero_pad |= *(char *)desc.buffer == '0';
567 if (update_tree_entry_gently(&desc)) {
568 retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
569 break;
570 }
571
572 switch (mode) {
573 /*
574 * Standard modes..
575 */
576 case S_IFREG | 0755:
577 case S_IFREG | 0644:
578 case S_IFLNK:
579 case S_IFDIR:
580 case S_IFGITLINK:
581 break;
582 /*
583 * This is nonstandard, but we had a few of these
584 * early on when we honored the full set of mode
585 * bits..
586 */
587 case S_IFREG | 0664:
588 if (!options->strict)
589 break;
590 default:
591 has_bad_modes = 1;
592 }
593
594 if (o_name) {
595 switch (verify_ordered(o_mode, o_name, mode, name)) {
596 case TREE_UNORDERED:
597 not_properly_sorted = 1;
598 break;
599 case TREE_HAS_DUPS:
600 has_dup_entries = 1;
601 break;
602 default:
603 break;
604 }
605 }
606
607 o_mode = mode;
608 o_name = name;
609 }
610
611 if (has_null_sha1)
612 retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
613 if (has_full_path)
614 retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
615 if (has_empty_name)
616 retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
617 if (has_dot)
618 retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
619 if (has_dotdot)
620 retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
621 if (has_dotgit)
622 retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
623 if (has_zero_pad)
624 retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
625 if (has_bad_modes)
626 retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
627 if (has_dup_entries)
628 retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
629 if (not_properly_sorted)
630 retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
631 return retval;
632 }
633
634 static int verify_headers(const void *data, unsigned long size,
635 struct object *obj, struct fsck_options *options)
636 {
637 const char *buffer = (const char *)data;
638 unsigned long i;
639
640 for (i = 0; i < size; i++) {
641 switch (buffer[i]) {
642 case '\0':
643 return report(options, obj,
644 FSCK_MSG_NUL_IN_HEADER,
645 "unterminated header: NUL at offset %ld", i);
646 case '\n':
647 if (i + 1 < size && buffer[i + 1] == '\n')
648 return 0;
649 }
650 }
651
652 /*
653 * We did not find double-LF that separates the header
654 * and the body. Not having a body is not a crime but
655 * we do want to see the terminating LF for the last header
656 * line.
657 */
658 if (size && buffer[size - 1] == '\n')
659 return 0;
660
661 return report(options, obj,
662 FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
663 }
664
665 static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
666 {
667 const char *p = *ident;
668 char *end;
669
670 *ident = strchrnul(*ident, '\n');
671 if (**ident == '\n')
672 (*ident)++;
673
674 if (*p == '<')
675 return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
676 p += strcspn(p, "<>\n");
677 if (*p == '>')
678 return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
679 if (*p != '<')
680 return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
681 if (p[-1] != ' ')
682 return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
683 p++;
684 p += strcspn(p, "<>\n");
685 if (*p != '>')
686 return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
687 p++;
688 if (*p != ' ')
689 return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
690 p++;
691 if (*p == '0' && p[1] != ' ')
692 return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
693 if (date_overflows(strtoul(p, &end, 10)))
694 return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
695 if ((end == p || *end != ' '))
696 return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
697 p = end + 1;
698 if ((*p != '+' && *p != '-') ||
699 !isdigit(p[1]) ||
700 !isdigit(p[2]) ||
701 !isdigit(p[3]) ||
702 !isdigit(p[4]) ||
703 (p[5] != '\n'))
704 return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
705 p += 6;
706 return 0;
707 }
708
709 static int fsck_commit_buffer(struct commit *commit, const char *buffer,
710 unsigned long size, struct fsck_options *options)
711 {
712 unsigned char tree_sha1[20], sha1[20];
713 struct commit_graft *graft;
714 unsigned parent_count, parent_line_count = 0, author_count;
715 int err;
716 const char *buffer_begin = buffer;
717
718 if (verify_headers(buffer, size, &commit->object, options))
719 return -1;
720
721 if (!skip_prefix(buffer, "tree ", &buffer))
722 return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
723 if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n') {
724 err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
725 if (err)
726 return err;
727 }
728 buffer += 41;
729 while (skip_prefix(buffer, "parent ", &buffer)) {
730 if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
731 err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
732 if (err)
733 return err;
734 }
735 buffer += 41;
736 parent_line_count++;
737 }
738 graft = lookup_commit_graft(commit->object.oid.hash);
739 parent_count = commit_list_count(commit->parents);
740 if (graft) {
741 if (graft->nr_parent == -1 && !parent_count)
742 ; /* shallow commit */
743 else if (graft->nr_parent != parent_count) {
744 err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
745 if (err)
746 return err;
747 }
748 } else {
749 if (parent_count != parent_line_count) {
750 err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
751 if (err)
752 return err;
753 }
754 }
755 author_count = 0;
756 while (skip_prefix(buffer, "author ", &buffer)) {
757 author_count++;
758 err = fsck_ident(&buffer, &commit->object, options);
759 if (err)
760 return err;
761 }
762 if (author_count < 1)
763 err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
764 else if (author_count > 1)
765 err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
766 if (err)
767 return err;
768 if (!skip_prefix(buffer, "committer ", &buffer))
769 return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
770 err = fsck_ident(&buffer, &commit->object, options);
771 if (err)
772 return err;
773 if (!commit->tree) {
774 err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
775 if (err)
776 return err;
777 }
778 if (memchr(buffer_begin, '\0', size)) {
779 err = report(options, &commit->object, FSCK_MSG_NUL_IN_COMMIT,
780 "NUL byte in the commit object body");
781 if (err)
782 return err;
783 }
784 return 0;
785 }
786
787 static int fsck_commit(struct commit *commit, const char *data,
788 unsigned long size, struct fsck_options *options)
789 {
790 const char *buffer = data ? data : get_commit_buffer(commit, &size);
791 int ret = fsck_commit_buffer(commit, buffer, size, options);
792 if (!data)
793 unuse_commit_buffer(commit, buffer);
794 return ret;
795 }
796
797 static int fsck_tag_buffer(struct tag *tag, const char *data,
798 unsigned long size, struct fsck_options *options)
799 {
800 unsigned char sha1[20];
801 int ret = 0;
802 const char *buffer;
803 char *to_free = NULL, *eol;
804 struct strbuf sb = STRBUF_INIT;
805
806 if (data)
807 buffer = data;
808 else {
809 enum object_type type;
810
811 buffer = to_free =
812 read_sha1_file(tag->object.oid.hash, &type, &size);
813 if (!buffer)
814 return report(options, &tag->object,
815 FSCK_MSG_MISSING_TAG_OBJECT,
816 "cannot read tag object");
817
818 if (type != OBJ_TAG) {
819 ret = report(options, &tag->object,
820 FSCK_MSG_TAG_OBJECT_NOT_TAG,
821 "expected tag got %s",
822 typename(type));
823 goto done;
824 }
825 }
826
827 ret = verify_headers(buffer, size, &tag->object, options);
828 if (ret)
829 goto done;
830
831 if (!skip_prefix(buffer, "object ", &buffer)) {
832 ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
833 goto done;
834 }
835 if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
836 ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
837 if (ret)
838 goto done;
839 }
840 buffer += 41;
841
842 if (!skip_prefix(buffer, "type ", &buffer)) {
843 ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
844 goto done;
845 }
846 eol = strchr(buffer, '\n');
847 if (!eol) {
848 ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
849 goto done;
850 }
851 if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
852 ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
853 if (ret)
854 goto done;
855 buffer = eol + 1;
856
857 if (!skip_prefix(buffer, "tag ", &buffer)) {
858 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
859 goto done;
860 }
861 eol = strchr(buffer, '\n');
862 if (!eol) {
863 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
864 goto done;
865 }
866 strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
867 if (check_refname_format(sb.buf, 0)) {
868 ret = report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
869 "invalid 'tag' name: %.*s",
870 (int)(eol - buffer), buffer);
871 if (ret)
872 goto done;
873 }
874 buffer = eol + 1;
875
876 if (!skip_prefix(buffer, "tagger ", &buffer)) {
877 /* early tags do not contain 'tagger' lines; warn only */
878 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
879 if (ret)
880 goto done;
881 }
882 else
883 ret = fsck_ident(&buffer, &tag->object, options);
884
885 done:
886 strbuf_release(&sb);
887 free(to_free);
888 return ret;
889 }
890
891 static int fsck_tag(struct tag *tag, const char *data,
892 unsigned long size, struct fsck_options *options)
893 {
894 struct object *tagged = tag->tagged;
895
896 if (!tagged)
897 return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
898
899 return fsck_tag_buffer(tag, data, size, options);
900 }
901
902 int fsck_object(struct object *obj, void *data, unsigned long size,
903 struct fsck_options *options)
904 {
905 if (!obj)
906 return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
907
908 if (obj->type == OBJ_BLOB)
909 return 0;
910 if (obj->type == OBJ_TREE)
911 return fsck_tree((struct tree *) obj, options);
912 if (obj->type == OBJ_COMMIT)
913 return fsck_commit((struct commit *) obj, (const char *) data,
914 size, options);
915 if (obj->type == OBJ_TAG)
916 return fsck_tag((struct tag *) obj, (const char *) data,
917 size, options);
918
919 return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
920 obj->type);
921 }
922
923 int fsck_error_function(struct fsck_options *o,
924 struct object *obj, int msg_type, const char *message)
925 {
926 if (msg_type == FSCK_WARN) {
927 warning("object %s: %s", describe_object(o, obj), message);
928 return 0;
929 }
930 error("object %s: %s", describe_object(o, obj), message);
931 return 1;
932 }