fsck: give the error function a chance to see the fsck_options
[git/git.git] / fsck.c
CommitLineData
355885d5
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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"
cec097be 9#include "refs.h"
a18fcc9f 10#include "utf8.h"
cd94c6f9 11#include "sha1-array.h"
7b35efd7 12#include "decorate.h"
355885d5 13
f50c4407 14#define FSCK_FATAL -1
f27d05b1 15#define FSCK_INFO -2
f50c4407 16
c99ba492 17#define FOREACH_MSG_ID(FUNC) \
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18 /* fatal errors */ \
19 FUNC(NUL_IN_HEADER, FATAL) \
20 FUNC(UNTERMINATED_HEADER, FATAL) \
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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) \
c9ad147f 49 FUNC(MULTIPLE_AUTHORS, ERROR) \
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50 FUNC(TAG_OBJECT_NOT_TAG, ERROR) \
51 FUNC(TREE_NOT_SORTED, ERROR) \
52 FUNC(UNKNOWN_TYPE, ERROR) \
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53 FUNC(ZERO_PADDED_DATE, ERROR) \
54 /* warnings */ \
55 FUNC(BAD_FILEMODE, WARN) \
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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) \
c99ba492 61 FUNC(NULL_SHA1, WARN) \
f27d05b1 62 FUNC(ZERO_PADDED_FILEMODE, WARN) \
6d2d780f 63 FUNC(NUL_IN_COMMIT, WARN) \
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64 /* infos (reported as warnings, but ignored by default) */ \
65 FUNC(BAD_TAG_NAME, INFO) \
66 FUNC(MISSING_TAGGER_ENTRY, INFO)
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67
68#define MSG_ID(id, msg_type) FSCK_MSG_##id,
69enum fsck_msg_id {
70 FOREACH_MSG_ID(MSG_ID)
71 FSCK_MSG_MAX
72};
73#undef MSG_ID
74
f417eed8
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75#define STR(x) #x
76#define MSG_ID(id, msg_type) { STR(id), NULL, FSCK_##msg_type },
c99ba492 77static struct {
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78 const char *id_string;
79 const char *downcased;
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80 int msg_type;
81} msg_id_info[FSCK_MSG_MAX + 1] = {
82 FOREACH_MSG_ID(MSG_ID)
f417eed8 83 { NULL, NULL, -1 }
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84};
85#undef MSG_ID
86
f417eed8
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87static 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
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115static int fsck_msg_type(enum fsck_msg_id msg_id,
116 struct fsck_options *options)
117{
118 int msg_type;
119
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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 }
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129
130 return msg_type;
131}
132
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133static 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
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170static 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;
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176 else if (!strcmp(str, "ignore"))
177 return FSCK_IGNORE;
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178 else
179 die("Unknown fsck message type: '%s'", str);
180}
181
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182int 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
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190void 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
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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
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202 if (!options->msg_type) {
203 int i;
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204 int *msg_type;
205 ALLOC_ARRAY(msg_type, FSCK_MSG_MAX);
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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
214void 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
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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
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243 if (equal == len)
244 die("Missing '=': '%s'", buf);
355885d5 245
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246 fsck_set_msg_type(options, buf, buf + equal + 1);
247 buf += len + 1;
248 }
249 free(to_free);
250}
251
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252static 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
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270__attribute__((format (printf, 4, 5)))
271static 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
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278 if (msg_type == FSCK_IGNORE)
279 return 0;
280
cd94c6f9 281 if (options->skiplist && object &&
ed1c9977 282 sha1_array_lookup(options->skiplist, object->oid.hash) >= 0)
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283 return 0;
284
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285 if (msg_type == FSCK_FATAL)
286 msg_type = FSCK_ERROR;
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287 else if (msg_type == FSCK_INFO)
288 msg_type = FSCK_WARN;
f50c4407 289
71ab8fa8
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290 append_msg_id(&sb, msg_id_info[id].id_string);
291
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292 va_start(ap, fmt);
293 strbuf_vaddf(&sb, fmt, ap);
1cd772cc 294 result = options->error_func(options, object, msg_type, sb.buf);
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295 strbuf_release(&sb);
296 va_end(ap);
297
298 return result;
299}
300
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301static 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
308static 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
22410549 326static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
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327{
328 struct tree_desc desc;
329 struct name_entry entry;
330 int res = 0;
7b35efd7 331 const char *name;
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332
333 if (parse_tree(tree))
334 return -1;
335
7b35efd7 336 name = get_object_name(options, &tree->object);
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337 init_tree_desc(&desc, tree->buffer, tree->size);
338 while (tree_entry(&desc, &entry)) {
7b35efd7 339 struct object *obj;
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340 int result;
341
342 if (S_ISGITLINK(entry.mode))
343 continue;
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344
345 if (S_ISDIR(entry.mode)) {
346 obj = &lookup_tree(entry.oid->hash)->object;
347 if (name)
348 put_object_name(options, obj, "%s%s/", name,
349 entry.path);
350 result = options->walk(obj, OBJ_TREE, data, options);
351 }
352 else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
353 obj = &lookup_blob(entry.oid->hash)->object;
354 if (name)
355 put_object_name(options, obj, "%s%s", name,
356 entry.path);
357 result = options->walk(obj, OBJ_BLOB, data, options);
358 }
355885d5 359 else {
82247e9b 360 result = error("in tree %s: entry %s has bad mode %.6o",
f2fd0760 361 oid_to_hex(&tree->object.oid), entry.path, entry.mode);
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MK
362 }
363 if (result < 0)
364 return result;
365 if (!res)
366 res = result;
367 }
368 return res;
369}
370
22410549 371static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
355885d5 372{
7b35efd7 373 int counter = 0, generation = 0, name_prefix_len = 0;
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374 struct commit_list *parents;
375 int res;
376 int result;
7b35efd7 377 const char *name;
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MK
378
379 if (parse_commit(commit))
380 return -1;
381
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382 name = get_object_name(options, &commit->object);
383 if (name)
384 put_object_name(options, &commit->tree->object, "%s:", name);
385
22410549 386 result = options->walk((struct object *)commit->tree, OBJ_TREE, data, options);
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387 if (result < 0)
388 return result;
389 res = result;
390
391 parents = commit->parents;
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JS
392 if (name && parents) {
393 int len = strlen(name), power;
394
395 if (len && name[len - 1] == '^') {
396 generation = 1;
397 name_prefix_len = len - 1;
398 }
399 else { /* parse ~<generation> suffix */
400 for (generation = 0, power = 1;
401 len && isdigit(name[len - 1]);
402 power *= 10)
403 generation += power * (name[--len] - '0');
404 if (power > 1 && len && name[len - 1] == '~')
405 name_prefix_len = len - 1;
406 }
407 }
408
355885d5 409 while (parents) {
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JS
410 if (name) {
411 struct object *obj = &parents->item->object;
412
413 if (++counter > 1)
414 put_object_name(options, obj, "%s^%d",
415 name, counter);
416 else if (generation > 0)
417 put_object_name(options, obj, "%.*s~%d",
418 name_prefix_len, name, generation + 1);
419 else
420 put_object_name(options, obj, "%s^", name);
421 }
22410549 422 result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
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MK
423 if (result < 0)
424 return result;
425 if (!res)
426 res = result;
427 parents = parents->next;
428 }
429 return res;
430}
431
22410549 432static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
355885d5 433{
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434 char *name = get_object_name(options, &tag->object);
435
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MK
436 if (parse_tag(tag))
437 return -1;
7b35efd7
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438 if (name)
439 put_object_name(options, tag->tagged, "%s", name);
22410549 440 return options->walk(tag->tagged, OBJ_ANY, data, options);
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441}
442
22410549 443int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
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444{
445 if (!obj)
446 return -1;
447 switch (obj->type) {
448 case OBJ_BLOB:
449 return 0;
450 case OBJ_TREE:
22410549 451 return fsck_walk_tree((struct tree *)obj, data, options);
355885d5 452 case OBJ_COMMIT:
22410549 453 return fsck_walk_commit((struct commit *)obj, data, options);
355885d5 454 case OBJ_TAG:
22410549 455 return fsck_walk_tag((struct tag *)obj, data, options);
355885d5 456 default:
f2fd0760 457 error("Unknown object type for %s", oid_to_hex(&obj->oid));
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458 return -1;
459 }
460}
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461
462/*
463 * The entries in a tree are ordered in the _path_ order,
464 * which means that a directory entry is ordered by adding
465 * a slash to the end of it.
466 *
467 * So a directory called "a" is ordered _after_ a file
468 * called "a.c", because "a/" sorts after "a.c".
469 */
470#define TREE_UNORDERED (-1)
471#define TREE_HAS_DUPS (-2)
472
473static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
474{
475 int len1 = strlen(name1);
476 int len2 = strlen(name2);
477 int len = len1 < len2 ? len1 : len2;
478 unsigned char c1, c2;
479 int cmp;
480
481 cmp = memcmp(name1, name2, len);
482 if (cmp < 0)
483 return 0;
484 if (cmp > 0)
485 return TREE_UNORDERED;
486
487 /*
488 * Ok, the first <len> characters are the same.
489 * Now we need to order the next one, but turn
490 * a '\0' into a '/' for a directory entry.
491 */
492 c1 = name1[len];
493 c2 = name2[len];
494 if (!c1 && !c2)
495 /*
496 * git-write-tree used to write out a nonsense tree that has
497 * entries with the same name, one blob and one tree. Make
498 * sure we do not have duplicate entries.
499 */
500 return TREE_HAS_DUPS;
501 if (!c1 && S_ISDIR(mode1))
502 c1 = '/';
503 if (!c2 && S_ISDIR(mode2))
504 c2 = '/';
505 return c1 < c2 ? 0 : TREE_UNORDERED;
506}
507
22410549 508static int fsck_tree(struct tree *item, struct fsck_options *options)
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509{
510 int retval;
c479d14a 511 int has_null_sha1 = 0;
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512 int has_full_path = 0;
513 int has_empty_name = 0;
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514 int has_dot = 0;
515 int has_dotdot = 0;
5c17f512 516 int has_dotgit = 0;
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517 int has_zero_pad = 0;
518 int has_bad_modes = 0;
519 int has_dup_entries = 0;
520 int not_properly_sorted = 0;
521 struct tree_desc desc;
522 unsigned o_mode;
523 const char *o_name;
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524
525 init_tree_desc(&desc, item->buffer, item->size);
526
527 o_mode = 0;
528 o_name = NULL;
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529
530 while (desc.size) {
531 unsigned mode;
532 const char *name;
ce6663a9 533 const struct object_id *oid;
ba002f3b 534
ce6663a9 535 oid = tree_entry_extract(&desc, &name, &mode);
ba002f3b 536
ce6663a9 537 has_null_sha1 |= is_null_oid(oid);
effd12ec
HS
538 has_full_path |= !!strchr(name, '/');
539 has_empty_name |= !*name;
540 has_dot |= !strcmp(name, ".");
541 has_dotdot |= !strcmp(name, "..");
5e519fb8
JH
542 has_dotgit |= (!strcmp(name, ".git") ||
543 is_hfs_dotgit(name) ||
544 is_ntfs_dotgit(name));
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545 has_zero_pad |= *(char *)desc.buffer == '0';
546 update_tree_entry(&desc);
547
548 switch (mode) {
549 /*
550 * Standard modes..
551 */
552 case S_IFREG | 0755:
553 case S_IFREG | 0644:
554 case S_IFLNK:
555 case S_IFDIR:
556 case S_IFGITLINK:
557 break;
558 /*
559 * This is nonstandard, but we had a few of these
560 * early on when we honored the full set of mode
561 * bits..
562 */
563 case S_IFREG | 0664:
22410549 564 if (!options->strict)
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MK
565 break;
566 default:
567 has_bad_modes = 1;
568 }
569
570 if (o_name) {
571 switch (verify_ordered(o_mode, o_name, mode, name)) {
572 case TREE_UNORDERED:
573 not_properly_sorted = 1;
574 break;
575 case TREE_HAS_DUPS:
576 has_dup_entries = 1;
577 break;
578 default:
579 break;
580 }
581 }
582
583 o_mode = mode;
584 o_name = name;
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585 }
586
587 retval = 0;
c479d14a 588 if (has_null_sha1)
c99ba492 589 retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
ba002f3b 590 if (has_full_path)
c99ba492 591 retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
ba002f3b 592 if (has_empty_name)
c99ba492 593 retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
5d34a435 594 if (has_dot)
c99ba492 595 retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
5d34a435 596 if (has_dotdot)
c99ba492 597 retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
5c17f512 598 if (has_dotgit)
c99ba492 599 retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
ba002f3b 600 if (has_zero_pad)
c99ba492 601 retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
ba002f3b 602 if (has_bad_modes)
c99ba492 603 retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
ba002f3b 604 if (has_dup_entries)
c99ba492 605 retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
ba002f3b 606 if (not_properly_sorted)
c99ba492 607 retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
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608 return retval;
609}
610
84d18c0b 611static int verify_headers(const void *data, unsigned long size,
b2f44feb 612 struct object *obj, struct fsck_options *options)
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613{
614 const char *buffer = (const char *)data;
615 unsigned long i;
616
617 for (i = 0; i < size; i++) {
618 switch (buffer[i]) {
619 case '\0':
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620 return report(options, obj,
621 FSCK_MSG_NUL_IN_HEADER,
622 "unterminated header: NUL at offset %ld", i);
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623 case '\n':
624 if (i + 1 < size && buffer[i + 1] == '\n')
625 return 0;
626 }
627 }
628
84d18c0b
JH
629 /*
630 * We did not find double-LF that separates the header
631 * and the body. Not having a body is not a crime but
632 * we do want to see the terminating LF for the last header
633 * line.
634 */
635 if (size && buffer[size - 1] == '\n')
636 return 0;
637
c99ba492
JS
638 return report(options, obj,
639 FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
4d0d8975
JS
640}
641
22410549 642static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
daae1922 643{
e6826e33 644 const char *p = *ident;
d4b8de04
JK
645 char *end;
646
e6826e33
JS
647 *ident = strchrnul(*ident, '\n');
648 if (**ident == '\n')
649 (*ident)++;
650
651 if (*p == '<')
c99ba492 652 return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
e6826e33
JS
653 p += strcspn(p, "<>\n");
654 if (*p == '>')
c99ba492 655 return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
e6826e33 656 if (*p != '<')
c99ba492 657 return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
e6826e33 658 if (p[-1] != ' ')
c99ba492 659 return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
e6826e33
JS
660 p++;
661 p += strcspn(p, "<>\n");
662 if (*p != '>')
c99ba492 663 return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
e6826e33
JS
664 p++;
665 if (*p != ' ')
c99ba492 666 return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
e6826e33
JS
667 p++;
668 if (*p == '0' && p[1] != ' ')
c99ba492 669 return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
e6826e33 670 if (date_overflows(strtoul(p, &end, 10)))
c99ba492 671 return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
e6826e33 672 if ((end == p || *end != ' '))
c99ba492 673 return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
e6826e33
JS
674 p = end + 1;
675 if ((*p != '+' && *p != '-') ||
676 !isdigit(p[1]) ||
677 !isdigit(p[2]) ||
678 !isdigit(p[3]) ||
679 !isdigit(p[4]) ||
680 (p[5] != '\n'))
c99ba492 681 return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
e6826e33 682 p += 6;
daae1922
JN
683 return 0;
684}
685
bc6b8fc1 686static int fsck_commit_buffer(struct commit *commit, const char *buffer,
22410549 687 unsigned long size, struct fsck_options *options)
ba002f3b 688{
ba002f3b
MK
689 unsigned char tree_sha1[20], sha1[20];
690 struct commit_graft *graft;
c9ad147f 691 unsigned parent_count, parent_line_count = 0, author_count;
daae1922 692 int err;
6d2d780f 693 const char *buffer_begin = buffer;
ba002f3b 694
b2f44feb 695 if (verify_headers(buffer, size, &commit->object, options))
4d0d8975
JS
696 return -1;
697
cf4fff57 698 if (!skip_prefix(buffer, "tree ", &buffer))
c99ba492 699 return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
b3584761
JS
700 if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n') {
701 err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
702 if (err)
703 return err;
704 }
2d820a61 705 buffer += 41;
cf4fff57 706 while (skip_prefix(buffer, "parent ", &buffer)) {
b3584761
JS
707 if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
708 err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
709 if (err)
710 return err;
711 }
2d820a61 712 buffer += 41;
9d02150c 713 parent_line_count++;
ba002f3b 714 }
ed1c9977 715 graft = lookup_commit_graft(commit->object.oid.hash);
9d02150c 716 parent_count = commit_list_count(commit->parents);
ba002f3b 717 if (graft) {
9d02150c 718 if (graft->nr_parent == -1 && !parent_count)
ba002f3b 719 ; /* shallow commit */
b3584761
JS
720 else if (graft->nr_parent != parent_count) {
721 err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
722 if (err)
723 return err;
724 }
ba002f3b 725 } else {
b3584761
JS
726 if (parent_count != parent_line_count) {
727 err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
728 if (err)
729 return err;
730 }
ba002f3b 731 }
c9ad147f
JS
732 author_count = 0;
733 while (skip_prefix(buffer, "author ", &buffer)) {
734 author_count++;
735 err = fsck_ident(&buffer, &commit->object, options);
736 if (err)
737 return err;
ba002f3b 738 }
c9ad147f
JS
739 if (author_count < 1)
740 err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
741 else if (author_count > 1)
742 err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
daae1922
JN
743 if (err)
744 return err;
cf4fff57 745 if (!skip_prefix(buffer, "committer ", &buffer))
c99ba492 746 return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
22410549 747 err = fsck_ident(&buffer, &commit->object, options);
daae1922
JN
748 if (err)
749 return err;
5af29718
JH
750 if (!commit->tree) {
751 err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
752 if (err)
753 return err;
754 }
6d2d780f
JH
755 if (memchr(buffer_begin, '\0', size)) {
756 err = report(options, &commit->object, FSCK_MSG_NUL_IN_COMMIT,
757 "NUL byte in the commit object body");
758 if (err)
759 return err;
760 }
ba002f3b
MK
761 return 0;
762}
763
90a398bb 764static int fsck_commit(struct commit *commit, const char *data,
22410549 765 unsigned long size, struct fsck_options *options)
bc6b8fc1 766{
90a398bb 767 const char *buffer = data ? data : get_commit_buffer(commit, &size);
22410549 768 int ret = fsck_commit_buffer(commit, buffer, size, options);
90a398bb
JS
769 if (!data)
770 unuse_commit_buffer(commit, buffer);
bc6b8fc1
JK
771 return ret;
772}
773
cec097be 774static int fsck_tag_buffer(struct tag *tag, const char *data,
22410549 775 unsigned long size, struct fsck_options *options)
cec097be
JS
776{
777 unsigned char sha1[20];
778 int ret = 0;
779 const char *buffer;
780 char *to_free = NULL, *eol;
781 struct strbuf sb = STRBUF_INIT;
782
783 if (data)
784 buffer = data;
785 else {
786 enum object_type type;
787
788 buffer = to_free =
ed1c9977 789 read_sha1_file(tag->object.oid.hash, &type, &size);
cec097be 790 if (!buffer)
c99ba492
JS
791 return report(options, &tag->object,
792 FSCK_MSG_MISSING_TAG_OBJECT,
cec097be
JS
793 "cannot read tag object");
794
795 if (type != OBJ_TAG) {
c99ba492
JS
796 ret = report(options, &tag->object,
797 FSCK_MSG_TAG_OBJECT_NOT_TAG,
cec097be
JS
798 "expected tag got %s",
799 typename(type));
800 goto done;
801 }
802 }
803
8a272f29
RS
804 ret = verify_headers(buffer, size, &tag->object, options);
805 if (ret)
cec097be
JS
806 goto done;
807
808 if (!skip_prefix(buffer, "object ", &buffer)) {
c99ba492 809 ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
cec097be
JS
810 goto done;
811 }
812 if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
c99ba492 813 ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
7d7d5b05
JS
814 if (ret)
815 goto done;
cec097be
JS
816 }
817 buffer += 41;
818
819 if (!skip_prefix(buffer, "type ", &buffer)) {
c99ba492 820 ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
cec097be
JS
821 goto done;
822 }
823 eol = strchr(buffer, '\n');
824 if (!eol) {
c99ba492 825 ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
cec097be
JS
826 goto done;
827 }
828 if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
c99ba492 829 ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
cec097be
JS
830 if (ret)
831 goto done;
832 buffer = eol + 1;
833
834 if (!skip_prefix(buffer, "tag ", &buffer)) {
c99ba492 835 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
cec097be
JS
836 goto done;
837 }
838 eol = strchr(buffer, '\n');
839 if (!eol) {
c99ba492 840 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
cec097be
JS
841 goto done;
842 }
843 strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
f27d05b1
JS
844 if (check_refname_format(sb.buf, 0)) {
845 ret = report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
c99ba492 846 "invalid 'tag' name: %.*s",
7add4419 847 (int)(eol - buffer), buffer);
f27d05b1
JS
848 if (ret)
849 goto done;
850 }
cec097be
JS
851 buffer = eol + 1;
852
f27d05b1 853 if (!skip_prefix(buffer, "tagger ", &buffer)) {
cec097be 854 /* early tags do not contain 'tagger' lines; warn only */
f27d05b1
JS
855 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
856 if (ret)
857 goto done;
858 }
cec097be 859 else
22410549 860 ret = fsck_ident(&buffer, &tag->object, options);
cec097be
JS
861
862done:
863 strbuf_release(&sb);
864 free(to_free);
865 return ret;
866}
867
90a398bb 868static int fsck_tag(struct tag *tag, const char *data,
22410549 869 unsigned long size, struct fsck_options *options)
ba002f3b
MK
870{
871 struct object *tagged = tag->tagged;
872
873 if (!tagged)
c99ba492 874 return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
cec097be 875
22410549 876 return fsck_tag_buffer(tag, data, size, options);
ba002f3b
MK
877}
878
90a398bb 879int fsck_object(struct object *obj, void *data, unsigned long size,
22410549 880 struct fsck_options *options)
ba002f3b
MK
881{
882 if (!obj)
c99ba492 883 return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
ba002f3b
MK
884
885 if (obj->type == OBJ_BLOB)
886 return 0;
887 if (obj->type == OBJ_TREE)
22410549 888 return fsck_tree((struct tree *) obj, options);
ba002f3b 889 if (obj->type == OBJ_COMMIT)
90a398bb 890 return fsck_commit((struct commit *) obj, (const char *) data,
22410549 891 size, options);
ba002f3b 892 if (obj->type == OBJ_TAG)
90a398bb 893 return fsck_tag((struct tag *) obj, (const char *) data,
22410549 894 size, options);
ba002f3b 895
c99ba492 896 return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
ba002f3b
MK
897 obj->type);
898}
d6ffc8d7 899
1cd772cc
JS
900int fsck_error_function(struct fsck_options *o,
901 struct object *obj, int msg_type, const char *message)
d6ffc8d7 902{
0282f4dc 903 if (msg_type == FSCK_WARN) {
f2fd0760 904 warning("object %s: %s", oid_to_hex(&obj->oid), message);
0282f4dc
JS
905 return 0;
906 }
f2fd0760 907 error("object %s: %s", oid_to_hex(&obj->oid), message);
d6ffc8d7
MK
908 return 1;
909}