Merge branch 'bp/merge-rename-config'
[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 #include "oidset.h"
14 #include "packfile.h"
15 #include "submodule-config.h"
16 #include "config.h"
17
18 static struct oidset gitmodules_found = OIDSET_INIT;
19 static struct oidset gitmodules_done = OIDSET_INIT;
20
21 #define FSCK_FATAL -1
22 #define FSCK_INFO -2
23
24 #define FOREACH_MSG_ID(FUNC) \
25         /* fatal errors */ \
26         FUNC(NUL_IN_HEADER, FATAL) \
27         FUNC(UNTERMINATED_HEADER, FATAL) \
28         /* errors */ \
29         FUNC(BAD_DATE, ERROR) \
30         FUNC(BAD_DATE_OVERFLOW, ERROR) \
31         FUNC(BAD_EMAIL, ERROR) \
32         FUNC(BAD_NAME, ERROR) \
33         FUNC(BAD_OBJECT_SHA1, ERROR) \
34         FUNC(BAD_PARENT_SHA1, ERROR) \
35         FUNC(BAD_TAG_OBJECT, ERROR) \
36         FUNC(BAD_TIMEZONE, ERROR) \
37         FUNC(BAD_TREE, ERROR) \
38         FUNC(BAD_TREE_SHA1, ERROR) \
39         FUNC(BAD_TYPE, ERROR) \
40         FUNC(DUPLICATE_ENTRIES, ERROR) \
41         FUNC(MISSING_AUTHOR, ERROR) \
42         FUNC(MISSING_COMMITTER, ERROR) \
43         FUNC(MISSING_EMAIL, ERROR) \
44         FUNC(MISSING_GRAFT, ERROR) \
45         FUNC(MISSING_NAME_BEFORE_EMAIL, ERROR) \
46         FUNC(MISSING_OBJECT, ERROR) \
47         FUNC(MISSING_PARENT, ERROR) \
48         FUNC(MISSING_SPACE_BEFORE_DATE, ERROR) \
49         FUNC(MISSING_SPACE_BEFORE_EMAIL, ERROR) \
50         FUNC(MISSING_TAG, ERROR) \
51         FUNC(MISSING_TAG_ENTRY, ERROR) \
52         FUNC(MISSING_TAG_OBJECT, ERROR) \
53         FUNC(MISSING_TREE, ERROR) \
54         FUNC(MISSING_TREE_OBJECT, ERROR) \
55         FUNC(MISSING_TYPE, ERROR) \
56         FUNC(MISSING_TYPE_ENTRY, ERROR) \
57         FUNC(MULTIPLE_AUTHORS, ERROR) \
58         FUNC(TAG_OBJECT_NOT_TAG, ERROR) \
59         FUNC(TREE_NOT_SORTED, ERROR) \
60         FUNC(UNKNOWN_TYPE, ERROR) \
61         FUNC(ZERO_PADDED_DATE, ERROR) \
62         FUNC(GITMODULES_MISSING, ERROR) \
63         FUNC(GITMODULES_BLOB, ERROR) \
64         FUNC(GITMODULES_PARSE, ERROR) \
65         FUNC(GITMODULES_NAME, ERROR) \
66         FUNC(GITMODULES_SYMLINK, ERROR) \
67         /* warnings */ \
68         FUNC(BAD_FILEMODE, WARN) \
69         FUNC(EMPTY_NAME, WARN) \
70         FUNC(FULL_PATHNAME, WARN) \
71         FUNC(HAS_DOT, WARN) \
72         FUNC(HAS_DOTDOT, WARN) \
73         FUNC(HAS_DOTGIT, WARN) \
74         FUNC(NULL_SHA1, WARN) \
75         FUNC(ZERO_PADDED_FILEMODE, WARN) \
76         FUNC(NUL_IN_COMMIT, WARN) \
77         /* infos (reported as warnings, but ignored by default) */ \
78         FUNC(BAD_TAG_NAME, INFO) \
79         FUNC(MISSING_TAGGER_ENTRY, INFO)
80
81 #define MSG_ID(id, msg_type) FSCK_MSG_##id,
82 enum fsck_msg_id {
83         FOREACH_MSG_ID(MSG_ID)
84         FSCK_MSG_MAX
85 };
86 #undef MSG_ID
87
88 #define STR(x) #x
89 #define MSG_ID(id, msg_type) { STR(id), NULL, FSCK_##msg_type },
90 static struct {
91         const char *id_string;
92         const char *downcased;
93         int msg_type;
94 } msg_id_info[FSCK_MSG_MAX + 1] = {
95         FOREACH_MSG_ID(MSG_ID)
96         { NULL, NULL, -1 }
97 };
98 #undef MSG_ID
99
100 static int parse_msg_id(const char *text)
101 {
102         int i;
103
104         if (!msg_id_info[0].downcased) {
105                 /* convert id_string to lower case, without underscores. */
106                 for (i = 0; i < FSCK_MSG_MAX; i++) {
107                         const char *p = msg_id_info[i].id_string;
108                         int len = strlen(p);
109                         char *q = xmalloc(len);
110
111                         msg_id_info[i].downcased = q;
112                         while (*p)
113                                 if (*p == '_')
114                                         p++;
115                                 else
116                                         *(q)++ = tolower(*(p)++);
117                         *q = '\0';
118                 }
119         }
120
121         for (i = 0; i < FSCK_MSG_MAX; i++)
122                 if (!strcmp(text, msg_id_info[i].downcased))
123                         return i;
124
125         return -1;
126 }
127
128 static int fsck_msg_type(enum fsck_msg_id msg_id,
129         struct fsck_options *options)
130 {
131         int msg_type;
132
133         assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
134
135         if (options->msg_type)
136                 msg_type = options->msg_type[msg_id];
137         else {
138                 msg_type = msg_id_info[msg_id].msg_type;
139                 if (options->strict && msg_type == FSCK_WARN)
140                         msg_type = FSCK_ERROR;
141         }
142
143         return msg_type;
144 }
145
146 static void init_skiplist(struct fsck_options *options, const char *path)
147 {
148         static struct oid_array skiplist = OID_ARRAY_INIT;
149         int sorted, fd;
150         char buffer[GIT_MAX_HEXSZ + 1];
151         struct object_id oid;
152
153         if (options->skiplist)
154                 sorted = options->skiplist->sorted;
155         else {
156                 sorted = 1;
157                 options->skiplist = &skiplist;
158         }
159
160         fd = open(path, O_RDONLY);
161         if (fd < 0)
162                 die("Could not open skip list: %s", path);
163         for (;;) {
164                 const char *p;
165                 int result = read_in_full(fd, buffer, sizeof(buffer));
166                 if (result < 0)
167                         die_errno("Could not read '%s'", path);
168                 if (!result)
169                         break;
170                 if (parse_oid_hex(buffer, &oid, &p) || *p != '\n')
171                         die("Invalid SHA-1: %s", buffer);
172                 oid_array_append(&skiplist, &oid);
173                 if (sorted && skiplist.nr > 1 &&
174                                 oidcmp(&skiplist.oid[skiplist.nr - 2],
175                                        &oid) > 0)
176                         sorted = 0;
177         }
178         close(fd);
179
180         if (sorted)
181                 skiplist.sorted = 1;
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                         init_skiplist(options, 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 __attribute__((format (printf, 4, 5)))
285 static int report(struct fsck_options *options, struct object *object,
286         enum fsck_msg_id id, const char *fmt, ...)
287 {
288         va_list ap;
289         struct strbuf sb = STRBUF_INIT;
290         int msg_type = fsck_msg_type(id, options), result;
291
292         if (msg_type == FSCK_IGNORE)
293                 return 0;
294
295         if (options->skiplist && object &&
296                         oid_array_lookup(options->skiplist, &object->oid) >= 0)
297                 return 0;
298
299         if (msg_type == FSCK_FATAL)
300                 msg_type = FSCK_ERROR;
301         else if (msg_type == FSCK_INFO)
302                 msg_type = FSCK_WARN;
303
304         append_msg_id(&sb, msg_id_info[id].id_string);
305
306         va_start(ap, fmt);
307         strbuf_vaddf(&sb, fmt, ap);
308         result = options->error_func(options, object, msg_type, sb.buf);
309         strbuf_release(&sb);
310         va_end(ap);
311
312         return result;
313 }
314
315 static char *get_object_name(struct fsck_options *options, struct object *obj)
316 {
317         if (!options->object_names)
318                 return NULL;
319         return lookup_decoration(options->object_names, obj);
320 }
321
322 static void put_object_name(struct fsck_options *options, struct object *obj,
323         const char *fmt, ...)
324 {
325         va_list ap;
326         struct strbuf buf = STRBUF_INIT;
327         char *existing;
328
329         if (!options->object_names)
330                 return;
331         existing = lookup_decoration(options->object_names, obj);
332         if (existing)
333                 return;
334         va_start(ap, fmt);
335         strbuf_vaddf(&buf, fmt, ap);
336         add_decoration(options->object_names, obj, strbuf_detach(&buf, NULL));
337         va_end(ap);
338 }
339
340 static const char *describe_object(struct fsck_options *o, struct object *obj)
341 {
342         static struct strbuf buf = STRBUF_INIT;
343         char *name;
344
345         strbuf_reset(&buf);
346         strbuf_addstr(&buf, oid_to_hex(&obj->oid));
347         if (o->object_names && (name = lookup_decoration(o->object_names, obj)))
348                 strbuf_addf(&buf, " (%s)", name);
349
350         return buf.buf;
351 }
352
353 static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
354 {
355         struct tree_desc desc;
356         struct name_entry entry;
357         int res = 0;
358         const char *name;
359
360         if (parse_tree(tree))
361                 return -1;
362
363         name = get_object_name(options, &tree->object);
364         if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
365                 return -1;
366         while (tree_entry_gently(&desc, &entry)) {
367                 struct object *obj;
368                 int result;
369
370                 if (S_ISGITLINK(entry.mode))
371                         continue;
372
373                 if (S_ISDIR(entry.mode)) {
374                         obj = (struct object *)lookup_tree(entry.oid);
375                         if (name && obj)
376                                 put_object_name(options, obj, "%s%s/", name,
377                                         entry.path);
378                         result = options->walk(obj, OBJ_TREE, data, options);
379                 }
380                 else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
381                         obj = (struct object *)lookup_blob(entry.oid);
382                         if (name && obj)
383                                 put_object_name(options, obj, "%s%s", name,
384                                         entry.path);
385                         result = options->walk(obj, OBJ_BLOB, data, options);
386                 }
387                 else {
388                         result = error("in tree %s: entry %s has bad mode %.6o",
389                                         describe_object(options, &tree->object), entry.path, entry.mode);
390                 }
391                 if (result < 0)
392                         return result;
393                 if (!res)
394                         res = result;
395         }
396         return res;
397 }
398
399 static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
400 {
401         int counter = 0, generation = 0, name_prefix_len = 0;
402         struct commit_list *parents;
403         int res;
404         int result;
405         const char *name;
406
407         if (parse_commit(commit))
408                 return -1;
409
410         name = get_object_name(options, &commit->object);
411         if (name)
412                 put_object_name(options, &get_commit_tree(commit)->object,
413                                 "%s:", name);
414
415         result = options->walk((struct object *)get_commit_tree(commit),
416                                OBJ_TREE, data, options);
417         if (result < 0)
418                 return result;
419         res = result;
420
421         parents = commit->parents;
422         if (name && parents) {
423                 int len = strlen(name), power;
424
425                 if (len && name[len - 1] == '^') {
426                         generation = 1;
427                         name_prefix_len = len - 1;
428                 }
429                 else { /* parse ~<generation> suffix */
430                         for (generation = 0, power = 1;
431                              len && isdigit(name[len - 1]);
432                              power *= 10)
433                                 generation += power * (name[--len] - '0');
434                         if (power > 1 && len && name[len - 1] == '~')
435                                 name_prefix_len = len - 1;
436                 }
437         }
438
439         while (parents) {
440                 if (name) {
441                         struct object *obj = &parents->item->object;
442
443                         if (++counter > 1)
444                                 put_object_name(options, obj, "%s^%d",
445                                         name, counter);
446                         else if (generation > 0)
447                                 put_object_name(options, obj, "%.*s~%d",
448                                         name_prefix_len, name, generation + 1);
449                         else
450                                 put_object_name(options, obj, "%s^", name);
451                 }
452                 result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
453                 if (result < 0)
454                         return result;
455                 if (!res)
456                         res = result;
457                 parents = parents->next;
458         }
459         return res;
460 }
461
462 static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
463 {
464         char *name = get_object_name(options, &tag->object);
465
466         if (parse_tag(tag))
467                 return -1;
468         if (name)
469                 put_object_name(options, tag->tagged, "%s", name);
470         return options->walk(tag->tagged, OBJ_ANY, data, options);
471 }
472
473 int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
474 {
475         if (!obj)
476                 return -1;
477
478         if (obj->type == OBJ_NONE)
479                 parse_object(&obj->oid);
480
481         switch (obj->type) {
482         case OBJ_BLOB:
483                 return 0;
484         case OBJ_TREE:
485                 return fsck_walk_tree((struct tree *)obj, data, options);
486         case OBJ_COMMIT:
487                 return fsck_walk_commit((struct commit *)obj, data, options);
488         case OBJ_TAG:
489                 return fsck_walk_tag((struct tag *)obj, data, options);
490         default:
491                 error("Unknown object type for %s", describe_object(options, obj));
492                 return -1;
493         }
494 }
495
496 /*
497  * The entries in a tree are ordered in the _path_ order,
498  * which means that a directory entry is ordered by adding
499  * a slash to the end of it.
500  *
501  * So a directory called "a" is ordered _after_ a file
502  * called "a.c", because "a/" sorts after "a.c".
503  */
504 #define TREE_UNORDERED (-1)
505 #define TREE_HAS_DUPS  (-2)
506
507 static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
508 {
509         int len1 = strlen(name1);
510         int len2 = strlen(name2);
511         int len = len1 < len2 ? len1 : len2;
512         unsigned char c1, c2;
513         int cmp;
514
515         cmp = memcmp(name1, name2, len);
516         if (cmp < 0)
517                 return 0;
518         if (cmp > 0)
519                 return TREE_UNORDERED;
520
521         /*
522          * Ok, the first <len> characters are the same.
523          * Now we need to order the next one, but turn
524          * a '\0' into a '/' for a directory entry.
525          */
526         c1 = name1[len];
527         c2 = name2[len];
528         if (!c1 && !c2)
529                 /*
530                  * git-write-tree used to write out a nonsense tree that has
531                  * entries with the same name, one blob and one tree.  Make
532                  * sure we do not have duplicate entries.
533                  */
534                 return TREE_HAS_DUPS;
535         if (!c1 && S_ISDIR(mode1))
536                 c1 = '/';
537         if (!c2 && S_ISDIR(mode2))
538                 c2 = '/';
539         return c1 < c2 ? 0 : TREE_UNORDERED;
540 }
541
542 static int fsck_tree(struct tree *item, struct fsck_options *options)
543 {
544         int retval = 0;
545         int has_null_sha1 = 0;
546         int has_full_path = 0;
547         int has_empty_name = 0;
548         int has_dot = 0;
549         int has_dotdot = 0;
550         int has_dotgit = 0;
551         int has_zero_pad = 0;
552         int has_bad_modes = 0;
553         int has_dup_entries = 0;
554         int not_properly_sorted = 0;
555         struct tree_desc desc;
556         unsigned o_mode;
557         const char *o_name;
558
559         if (init_tree_desc_gently(&desc, item->buffer, item->size)) {
560                 retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
561                 return retval;
562         }
563
564         o_mode = 0;
565         o_name = NULL;
566
567         while (desc.size) {
568                 unsigned mode;
569                 const char *name;
570                 const struct object_id *oid;
571
572                 oid = tree_entry_extract(&desc, &name, &mode);
573
574                 has_null_sha1 |= is_null_oid(oid);
575                 has_full_path |= !!strchr(name, '/');
576                 has_empty_name |= !*name;
577                 has_dot |= !strcmp(name, ".");
578                 has_dotdot |= !strcmp(name, "..");
579                 has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
580                 has_zero_pad |= *(char *)desc.buffer == '0';
581
582                 if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name)) {
583                         if (!S_ISLNK(mode))
584                                 oidset_insert(&gitmodules_found, oid);
585                         else
586                                 retval += report(options, &item->object,
587                                                  FSCK_MSG_GITMODULES_SYMLINK,
588                                                  ".gitmodules is a symbolic link");
589                 }
590
591                 if (update_tree_entry_gently(&desc)) {
592                         retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
593                         break;
594                 }
595
596                 switch (mode) {
597                 /*
598                  * Standard modes..
599                  */
600                 case S_IFREG | 0755:
601                 case S_IFREG | 0644:
602                 case S_IFLNK:
603                 case S_IFDIR:
604                 case S_IFGITLINK:
605                         break;
606                 /*
607                  * This is nonstandard, but we had a few of these
608                  * early on when we honored the full set of mode
609                  * bits..
610                  */
611                 case S_IFREG | 0664:
612                         if (!options->strict)
613                                 break;
614                         /* fallthrough */
615                 default:
616                         has_bad_modes = 1;
617                 }
618
619                 if (o_name) {
620                         switch (verify_ordered(o_mode, o_name, mode, name)) {
621                         case TREE_UNORDERED:
622                                 not_properly_sorted = 1;
623                                 break;
624                         case TREE_HAS_DUPS:
625                                 has_dup_entries = 1;
626                                 break;
627                         default:
628                                 break;
629                         }
630                 }
631
632                 o_mode = mode;
633                 o_name = name;
634         }
635
636         if (has_null_sha1)
637                 retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
638         if (has_full_path)
639                 retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
640         if (has_empty_name)
641                 retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
642         if (has_dot)
643                 retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
644         if (has_dotdot)
645                 retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
646         if (has_dotgit)
647                 retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
648         if (has_zero_pad)
649                 retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
650         if (has_bad_modes)
651                 retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
652         if (has_dup_entries)
653                 retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
654         if (not_properly_sorted)
655                 retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
656         return retval;
657 }
658
659 static int verify_headers(const void *data, unsigned long size,
660                           struct object *obj, struct fsck_options *options)
661 {
662         const char *buffer = (const char *)data;
663         unsigned long i;
664
665         for (i = 0; i < size; i++) {
666                 switch (buffer[i]) {
667                 case '\0':
668                         return report(options, obj,
669                                 FSCK_MSG_NUL_IN_HEADER,
670                                 "unterminated header: NUL at offset %ld", i);
671                 case '\n':
672                         if (i + 1 < size && buffer[i + 1] == '\n')
673                                 return 0;
674                 }
675         }
676
677         /*
678          * We did not find double-LF that separates the header
679          * and the body.  Not having a body is not a crime but
680          * we do want to see the terminating LF for the last header
681          * line.
682          */
683         if (size && buffer[size - 1] == '\n')
684                 return 0;
685
686         return report(options, obj,
687                 FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
688 }
689
690 static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
691 {
692         const char *p = *ident;
693         char *end;
694
695         *ident = strchrnul(*ident, '\n');
696         if (**ident == '\n')
697                 (*ident)++;
698
699         if (*p == '<')
700                 return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
701         p += strcspn(p, "<>\n");
702         if (*p == '>')
703                 return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
704         if (*p != '<')
705                 return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
706         if (p[-1] != ' ')
707                 return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
708         p++;
709         p += strcspn(p, "<>\n");
710         if (*p != '>')
711                 return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
712         p++;
713         if (*p != ' ')
714                 return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
715         p++;
716         if (*p == '0' && p[1] != ' ')
717                 return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
718         if (date_overflows(parse_timestamp(p, &end, 10)))
719                 return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
720         if ((end == p || *end != ' '))
721                 return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
722         p = end + 1;
723         if ((*p != '+' && *p != '-') ||
724             !isdigit(p[1]) ||
725             !isdigit(p[2]) ||
726             !isdigit(p[3]) ||
727             !isdigit(p[4]) ||
728             (p[5] != '\n'))
729                 return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
730         p += 6;
731         return 0;
732 }
733
734 static int fsck_commit_buffer(struct commit *commit, const char *buffer,
735         unsigned long size, struct fsck_options *options)
736 {
737         unsigned char tree_sha1[20], sha1[20];
738         struct commit_graft *graft;
739         unsigned parent_count, parent_line_count = 0, author_count;
740         int err;
741         const char *buffer_begin = buffer;
742
743         if (verify_headers(buffer, size, &commit->object, options))
744                 return -1;
745
746         if (!skip_prefix(buffer, "tree ", &buffer))
747                 return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
748         if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n') {
749                 err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
750                 if (err)
751                         return err;
752         }
753         buffer += 41;
754         while (skip_prefix(buffer, "parent ", &buffer)) {
755                 if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
756                         err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
757                         if (err)
758                                 return err;
759                 }
760                 buffer += 41;
761                 parent_line_count++;
762         }
763         graft = lookup_commit_graft(&commit->object.oid);
764         parent_count = commit_list_count(commit->parents);
765         if (graft) {
766                 if (graft->nr_parent == -1 && !parent_count)
767                         ; /* shallow commit */
768                 else if (graft->nr_parent != parent_count) {
769                         err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
770                         if (err)
771                                 return err;
772                 }
773         } else {
774                 if (parent_count != parent_line_count) {
775                         err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
776                         if (err)
777                                 return err;
778                 }
779         }
780         author_count = 0;
781         while (skip_prefix(buffer, "author ", &buffer)) {
782                 author_count++;
783                 err = fsck_ident(&buffer, &commit->object, options);
784                 if (err)
785                         return err;
786         }
787         if (author_count < 1)
788                 err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
789         else if (author_count > 1)
790                 err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
791         if (err)
792                 return err;
793         if (!skip_prefix(buffer, "committer ", &buffer))
794                 return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
795         err = fsck_ident(&buffer, &commit->object, options);
796         if (err)
797                 return err;
798         if (!get_commit_tree(commit)) {
799                 err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
800                 if (err)
801                         return err;
802         }
803         if (memchr(buffer_begin, '\0', size)) {
804                 err = report(options, &commit->object, FSCK_MSG_NUL_IN_COMMIT,
805                              "NUL byte in the commit object body");
806                 if (err)
807                         return err;
808         }
809         return 0;
810 }
811
812 static int fsck_commit(struct commit *commit, const char *data,
813         unsigned long size, struct fsck_options *options)
814 {
815         const char *buffer = data ?  data : get_commit_buffer(commit, &size);
816         int ret = fsck_commit_buffer(commit, buffer, size, options);
817         if (!data)
818                 unuse_commit_buffer(commit, buffer);
819         return ret;
820 }
821
822 static int fsck_tag_buffer(struct tag *tag, const char *data,
823         unsigned long size, struct fsck_options *options)
824 {
825         unsigned char sha1[20];
826         int ret = 0;
827         const char *buffer;
828         char *to_free = NULL, *eol;
829         struct strbuf sb = STRBUF_INIT;
830
831         if (data)
832                 buffer = data;
833         else {
834                 enum object_type type;
835
836                 buffer = to_free =
837                         read_object_file(&tag->object.oid, &type, &size);
838                 if (!buffer)
839                         return report(options, &tag->object,
840                                 FSCK_MSG_MISSING_TAG_OBJECT,
841                                 "cannot read tag object");
842
843                 if (type != OBJ_TAG) {
844                         ret = report(options, &tag->object,
845                                 FSCK_MSG_TAG_OBJECT_NOT_TAG,
846                                 "expected tag got %s",
847                             type_name(type));
848                         goto done;
849                 }
850         }
851
852         ret = verify_headers(buffer, size, &tag->object, options);
853         if (ret)
854                 goto done;
855
856         if (!skip_prefix(buffer, "object ", &buffer)) {
857                 ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
858                 goto done;
859         }
860         if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
861                 ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
862                 if (ret)
863                         goto done;
864         }
865         buffer += 41;
866
867         if (!skip_prefix(buffer, "type ", &buffer)) {
868                 ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
869                 goto done;
870         }
871         eol = strchr(buffer, '\n');
872         if (!eol) {
873                 ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
874                 goto done;
875         }
876         if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
877                 ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
878         if (ret)
879                 goto done;
880         buffer = eol + 1;
881
882         if (!skip_prefix(buffer, "tag ", &buffer)) {
883                 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
884                 goto done;
885         }
886         eol = strchr(buffer, '\n');
887         if (!eol) {
888                 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
889                 goto done;
890         }
891         strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
892         if (check_refname_format(sb.buf, 0)) {
893                 ret = report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
894                            "invalid 'tag' name: %.*s",
895                            (int)(eol - buffer), buffer);
896                 if (ret)
897                         goto done;
898         }
899         buffer = eol + 1;
900
901         if (!skip_prefix(buffer, "tagger ", &buffer)) {
902                 /* early tags do not contain 'tagger' lines; warn only */
903                 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
904                 if (ret)
905                         goto done;
906         }
907         else
908                 ret = fsck_ident(&buffer, &tag->object, options);
909
910 done:
911         strbuf_release(&sb);
912         free(to_free);
913         return ret;
914 }
915
916 static int fsck_tag(struct tag *tag, const char *data,
917         unsigned long size, struct fsck_options *options)
918 {
919         struct object *tagged = tag->tagged;
920
921         if (!tagged)
922                 return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
923
924         return fsck_tag_buffer(tag, data, size, options);
925 }
926
927 struct fsck_gitmodules_data {
928         struct object *obj;
929         struct fsck_options *options;
930         int ret;
931 };
932
933 static int fsck_gitmodules_fn(const char *var, const char *value, void *vdata)
934 {
935         struct fsck_gitmodules_data *data = vdata;
936         const char *subsection, *key;
937         int subsection_len;
938         char *name;
939
940         if (parse_config_key(var, "submodule", &subsection, &subsection_len, &key) < 0 ||
941             !subsection)
942                 return 0;
943
944         name = xmemdupz(subsection, subsection_len);
945         if (check_submodule_name(name) < 0)
946                 data->ret |= report(data->options, data->obj,
947                                     FSCK_MSG_GITMODULES_NAME,
948                                     "disallowed submodule name: %s",
949                                     name);
950         free(name);
951
952         return 0;
953 }
954
955 static int fsck_blob(struct blob *blob, const char *buf,
956                      unsigned long size, struct fsck_options *options)
957 {
958         struct fsck_gitmodules_data data;
959
960         if (!oidset_contains(&gitmodules_found, &blob->object.oid))
961                 return 0;
962         oidset_insert(&gitmodules_done, &blob->object.oid);
963
964         if (!buf) {
965                 /*
966                  * A missing buffer here is a sign that the caller found the
967                  * blob too gigantic to load into memory. Let's just consider
968                  * that an error.
969                  */
970                 return report(options, &blob->object,
971                               FSCK_MSG_GITMODULES_PARSE,
972                               ".gitmodules too large to parse");
973         }
974
975         data.obj = &blob->object;
976         data.options = options;
977         data.ret = 0;
978         if (git_config_from_mem(fsck_gitmodules_fn, CONFIG_ORIGIN_BLOB,
979                                 ".gitmodules", buf, size, &data))
980                 data.ret |= report(options, &blob->object,
981                                    FSCK_MSG_GITMODULES_PARSE,
982                                    "could not parse gitmodules blob");
983
984         return data.ret;
985 }
986
987 int fsck_object(struct object *obj, void *data, unsigned long size,
988         struct fsck_options *options)
989 {
990         if (!obj)
991                 return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
992
993         if (obj->type == OBJ_BLOB)
994                 return fsck_blob((struct blob *)obj, data, size, options);
995         if (obj->type == OBJ_TREE)
996                 return fsck_tree((struct tree *) obj, options);
997         if (obj->type == OBJ_COMMIT)
998                 return fsck_commit((struct commit *) obj, (const char *) data,
999                         size, options);
1000         if (obj->type == OBJ_TAG)
1001                 return fsck_tag((struct tag *) obj, (const char *) data,
1002                         size, options);
1003
1004         return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
1005                           obj->type);
1006 }
1007
1008 int fsck_error_function(struct fsck_options *o,
1009         struct object *obj, int msg_type, const char *message)
1010 {
1011         if (msg_type == FSCK_WARN) {
1012                 warning("object %s: %s", describe_object(o, obj), message);
1013                 return 0;
1014         }
1015         error("object %s: %s", describe_object(o, obj), message);
1016         return 1;
1017 }
1018
1019 int fsck_finish(struct fsck_options *options)
1020 {
1021         int ret = 0;
1022         struct oidset_iter iter;
1023         const struct object_id *oid;
1024
1025         oidset_iter_init(&gitmodules_found, &iter);
1026         while ((oid = oidset_iter_next(&iter))) {
1027                 struct blob *blob;
1028                 enum object_type type;
1029                 unsigned long size;
1030                 char *buf;
1031
1032                 if (oidset_contains(&gitmodules_done, oid))
1033                         continue;
1034
1035                 blob = lookup_blob(oid);
1036                 if (!blob) {
1037                         ret |= report(options, &blob->object,
1038                                       FSCK_MSG_GITMODULES_BLOB,
1039                                       "non-blob found at .gitmodules");
1040                         continue;
1041                 }
1042
1043                 buf = read_object_file(oid, &type, &size);
1044                 if (!buf) {
1045                         if (is_promisor_object(&blob->object.oid))
1046                                 continue;
1047                         ret |= report(options, &blob->object,
1048                                       FSCK_MSG_GITMODULES_MISSING,
1049                                       "unable to read .gitmodules blob");
1050                         continue;
1051                 }
1052
1053                 if (type == OBJ_BLOB)
1054                         ret |= fsck_blob(blob, buf, size, options);
1055                 else
1056                         ret |= report(options, &blob->object,
1057                                       FSCK_MSG_GITMODULES_BLOB,
1058                                       "non-blob found at .gitmodules");
1059                 free(buf);
1060         }
1061
1062
1063         oidset_clear(&gitmodules_found);
1064         oidset_clear(&gitmodules_done);
1065         return ret;
1066 }