Remove "refs" field from "struct object"
[git/git.git] / fsck-objects.c
1 #include <sys/types.h>
2 #include <dirent.h>
3
4 #include "cache.h"
5 #include "commit.h"
6 #include "tree.h"
7 #include "blob.h"
8 #include "tag.h"
9 #include "refs.h"
10 #include "pack.h"
11 #include "cache-tree.h"
12 #include "tree-walk.h"
13
14 #define REACHABLE 0x0001
15 #define SEEN 0x0002
16
17 static int show_root = 0;
18 static int show_tags = 0;
19 static int show_unreachable = 0;
20 static int check_full = 0;
21 static int check_strict = 0;
22 static int keep_cache_objects = 0;
23 static unsigned char head_sha1[20];
24
25 #ifdef NO_D_INO_IN_DIRENT
26 #define SORT_DIRENT 0
27 #define DIRENT_SORT_HINT(de) 0
28 #else
29 #define SORT_DIRENT 1
30 #define DIRENT_SORT_HINT(de) ((de)->d_ino)
31 #endif
32
33 static void objreport(struct object *obj, const char *severity,
34 const char *err, va_list params)
35 {
36 fprintf(stderr, "%s in %s %s: ",
37 severity, typename(obj->type), sha1_to_hex(obj->sha1));
38 vfprintf(stderr, err, params);
39 fputs("\n", stderr);
40 }
41
42 static int objerror(struct object *obj, const char *err, ...)
43 {
44 va_list params;
45 va_start(params, err);
46 objreport(obj, "error", err, params);
47 va_end(params);
48 return -1;
49 }
50
51 static int objwarning(struct object *obj, const char *err, ...)
52 {
53 va_list params;
54 va_start(params, err);
55 objreport(obj, "warning", err, params);
56 va_end(params);
57 return -1;
58 }
59
60
61 static void check_connectivity(void)
62 {
63 int i;
64
65 /* Look up all the requirements, warn about missing objects.. */
66 for (i = 0; i < obj_allocs; i++) {
67 const struct object_refs *refs;
68 struct object *obj = objs[i];
69
70 if (!obj)
71 continue;
72
73 if (!obj->parsed) {
74 if (has_sha1_file(obj->sha1))
75 ; /* it is in pack */
76 else
77 printf("missing %s %s\n",
78 typename(obj->type), sha1_to_hex(obj->sha1));
79 continue;
80 }
81
82 refs = lookup_object_refs(obj);
83 if (refs) {
84 unsigned j;
85 for (j = 0; j < refs->count; j++) {
86 struct object *ref = refs->ref[j];
87 if (ref->parsed ||
88 (has_sha1_file(ref->sha1)))
89 continue;
90 printf("broken link from %7s %s\n",
91 typename(obj->type), sha1_to_hex(obj->sha1));
92 printf(" to %7s %s\n",
93 typename(ref->type), sha1_to_hex(ref->sha1));
94 }
95 }
96
97 if (show_unreachable && !(obj->flags & REACHABLE)) {
98 printf("unreachable %s %s\n",
99 typename(obj->type), sha1_to_hex(obj->sha1));
100 continue;
101 }
102
103 if (!obj->used) {
104 printf("dangling %s %s\n", typename(obj->type),
105 sha1_to_hex(obj->sha1));
106 }
107 }
108 }
109
110 /*
111 * The entries in a tree are ordered in the _path_ order,
112 * which means that a directory entry is ordered by adding
113 * a slash to the end of it.
114 *
115 * So a directory called "a" is ordered _after_ a file
116 * called "a.c", because "a/" sorts after "a.c".
117 */
118 #define TREE_UNORDERED (-1)
119 #define TREE_HAS_DUPS (-2)
120
121 static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
122 {
123 int len1 = strlen(name1);
124 int len2 = strlen(name2);
125 int len = len1 < len2 ? len1 : len2;
126 unsigned char c1, c2;
127 int cmp;
128
129 cmp = memcmp(name1, name2, len);
130 if (cmp < 0)
131 return 0;
132 if (cmp > 0)
133 return TREE_UNORDERED;
134
135 /*
136 * Ok, the first <len> characters are the same.
137 * Now we need to order the next one, but turn
138 * a '\0' into a '/' for a directory entry.
139 */
140 c1 = name1[len];
141 c2 = name2[len];
142 if (!c1 && !c2)
143 /*
144 * git-write-tree used to write out a nonsense tree that has
145 * entries with the same name, one blob and one tree. Make
146 * sure we do not have duplicate entries.
147 */
148 return TREE_HAS_DUPS;
149 if (!c1 && S_ISDIR(mode1))
150 c1 = '/';
151 if (!c2 && S_ISDIR(mode2))
152 c2 = '/';
153 return c1 < c2 ? 0 : TREE_UNORDERED;
154 }
155
156 static int fsck_tree(struct tree *item)
157 {
158 int retval;
159 int has_full_path = 0;
160 int has_zero_pad = 0;
161 int has_bad_modes = 0;
162 int has_dup_entries = 0;
163 int not_properly_sorted = 0;
164 struct tree_desc desc;
165 unsigned o_mode;
166 const char *o_name;
167 const unsigned char *o_sha1;
168
169 desc.buf = item->buffer;
170 desc.size = item->size;
171
172 o_mode = 0;
173 o_name = NULL;
174 o_sha1 = NULL;
175 while (desc.size) {
176 unsigned mode;
177 const char *name;
178 const unsigned char *sha1;
179
180 sha1 = tree_entry_extract(&desc, &name, &mode);
181
182 if (strchr(name, '/'))
183 has_full_path = 1;
184 has_zero_pad |= *(char *)desc.buf == '0';
185 update_tree_entry(&desc);
186
187 switch (mode) {
188 /*
189 * Standard modes..
190 */
191 case S_IFREG | 0755:
192 case S_IFREG | 0644:
193 case S_IFLNK:
194 case S_IFDIR:
195 break;
196 /*
197 * This is nonstandard, but we had a few of these
198 * early on when we honored the full set of mode
199 * bits..
200 */
201 case S_IFREG | 0664:
202 if (!check_strict)
203 break;
204 default:
205 has_bad_modes = 1;
206 }
207
208 if (o_name) {
209 switch (verify_ordered(o_mode, o_name, mode, name)) {
210 case TREE_UNORDERED:
211 not_properly_sorted = 1;
212 break;
213 case TREE_HAS_DUPS:
214 has_dup_entries = 1;
215 break;
216 default:
217 break;
218 }
219 }
220
221 o_mode = mode;
222 o_name = name;
223 o_sha1 = sha1;
224 }
225 free(item->buffer);
226 item->buffer = NULL;
227
228 retval = 0;
229 if (has_full_path) {
230 objwarning(&item->object, "contains full pathnames");
231 }
232 if (has_zero_pad) {
233 objwarning(&item->object, "contains zero-padded file modes");
234 }
235 if (has_bad_modes) {
236 objwarning(&item->object, "contains bad file modes");
237 }
238 if (has_dup_entries) {
239 retval = objerror(&item->object, "contains duplicate file entries");
240 }
241 if (not_properly_sorted) {
242 retval = objerror(&item->object, "not properly sorted");
243 }
244 return retval;
245 }
246
247 static int fsck_commit(struct commit *commit)
248 {
249 char *buffer = commit->buffer;
250 unsigned char tree_sha1[20], sha1[20];
251
252 if (memcmp(buffer, "tree ", 5))
253 return objerror(&commit->object, "invalid format - expected 'tree' line");
254 if (get_sha1_hex(buffer+5, tree_sha1) || buffer[45] != '\n')
255 return objerror(&commit->object, "invalid 'tree' line format - bad sha1");
256 buffer += 46;
257 while (!memcmp(buffer, "parent ", 7)) {
258 if (get_sha1_hex(buffer+7, sha1) || buffer[47] != '\n')
259 return objerror(&commit->object, "invalid 'parent' line format - bad sha1");
260 buffer += 48;
261 }
262 if (memcmp(buffer, "author ", 7))
263 return objerror(&commit->object, "invalid format - expected 'author' line");
264 free(commit->buffer);
265 commit->buffer = NULL;
266 if (!commit->tree)
267 return objerror(&commit->object, "could not load commit's tree %s", tree_sha1);
268 if (!commit->parents && show_root)
269 printf("root %s\n", sha1_to_hex(commit->object.sha1));
270 if (!commit->date)
271 printf("bad commit date in %s\n",
272 sha1_to_hex(commit->object.sha1));
273 return 0;
274 }
275
276 static int fsck_tag(struct tag *tag)
277 {
278 struct object *tagged = tag->tagged;
279
280 if (!tagged) {
281 return objerror(&tag->object, "could not load tagged object");
282 }
283 if (!show_tags)
284 return 0;
285
286 printf("tagged %s %s", typename(tagged->type), sha1_to_hex(tagged->sha1));
287 printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1));
288 return 0;
289 }
290
291 static int fsck_sha1(unsigned char *sha1)
292 {
293 struct object *obj = parse_object(sha1);
294 if (!obj)
295 return error("%s: object not found", sha1_to_hex(sha1));
296 if (obj->flags & SEEN)
297 return 0;
298 obj->flags |= SEEN;
299 if (obj->type == TYPE_BLOB)
300 return 0;
301 if (obj->type == TYPE_TREE)
302 return fsck_tree((struct tree *) obj);
303 if (obj->type == TYPE_COMMIT)
304 return fsck_commit((struct commit *) obj);
305 if (obj->type == TYPE_TAG)
306 return fsck_tag((struct tag *) obj);
307 /* By now, parse_object() would've returned NULL instead. */
308 return objerror(obj, "unknown type '%d' (internal fsck error)", obj->type);
309 }
310
311 /*
312 * This is the sorting chunk size: make it reasonably
313 * big so that we can sort well..
314 */
315 #define MAX_SHA1_ENTRIES (1024)
316
317 struct sha1_entry {
318 unsigned long ino;
319 unsigned char sha1[20];
320 };
321
322 static struct {
323 unsigned long nr;
324 struct sha1_entry *entry[MAX_SHA1_ENTRIES];
325 } sha1_list;
326
327 static int ino_compare(const void *_a, const void *_b)
328 {
329 const struct sha1_entry *a = _a, *b = _b;
330 unsigned long ino1 = a->ino, ino2 = b->ino;
331 return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
332 }
333
334 static void fsck_sha1_list(void)
335 {
336 int i, nr = sha1_list.nr;
337
338 if (SORT_DIRENT)
339 qsort(sha1_list.entry, nr,
340 sizeof(struct sha1_entry *), ino_compare);
341 for (i = 0; i < nr; i++) {
342 struct sha1_entry *entry = sha1_list.entry[i];
343 unsigned char *sha1 = entry->sha1;
344
345 sha1_list.entry[i] = NULL;
346 fsck_sha1(sha1);
347 free(entry);
348 }
349 sha1_list.nr = 0;
350 }
351
352 static void add_sha1_list(unsigned char *sha1, unsigned long ino)
353 {
354 struct sha1_entry *entry = xmalloc(sizeof(*entry));
355 int nr;
356
357 entry->ino = ino;
358 memcpy(entry->sha1, sha1, 20);
359 nr = sha1_list.nr;
360 if (nr == MAX_SHA1_ENTRIES) {
361 fsck_sha1_list();
362 nr = 0;
363 }
364 sha1_list.entry[nr] = entry;
365 sha1_list.nr = ++nr;
366 }
367
368 static int fsck_dir(int i, char *path)
369 {
370 DIR *dir = opendir(path);
371 struct dirent *de;
372
373 if (!dir)
374 return 0;
375
376 while ((de = readdir(dir)) != NULL) {
377 char name[100];
378 unsigned char sha1[20];
379 int len = strlen(de->d_name);
380
381 switch (len) {
382 case 2:
383 if (de->d_name[1] != '.')
384 break;
385 case 1:
386 if (de->d_name[0] != '.')
387 break;
388 continue;
389 case 38:
390 sprintf(name, "%02x", i);
391 memcpy(name+2, de->d_name, len+1);
392 if (get_sha1_hex(name, sha1) < 0)
393 break;
394 add_sha1_list(sha1, DIRENT_SORT_HINT(de));
395 continue;
396 }
397 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
398 }
399 closedir(dir);
400 return 0;
401 }
402
403 static int default_refs = 0;
404
405 static int fsck_handle_ref(const char *refname, const unsigned char *sha1)
406 {
407 struct object *obj;
408
409 obj = lookup_object(sha1);
410 if (!obj) {
411 if (has_sha1_file(sha1)) {
412 default_refs++;
413 return 0; /* it is in a pack */
414 }
415 error("%s: invalid sha1 pointer %s", refname, sha1_to_hex(sha1));
416 /* We'll continue with the rest despite the error.. */
417 return 0;
418 }
419 default_refs++;
420 obj->used = 1;
421 mark_reachable(obj, REACHABLE);
422 return 0;
423 }
424
425 static void get_default_heads(void)
426 {
427 for_each_ref(fsck_handle_ref);
428 if (!default_refs)
429 die("No default references");
430 }
431
432 static void fsck_object_dir(const char *path)
433 {
434 int i;
435 for (i = 0; i < 256; i++) {
436 static char dir[4096];
437 sprintf(dir, "%s/%02x", path, i);
438 fsck_dir(i, dir);
439 }
440 fsck_sha1_list();
441 }
442
443 static int fsck_head_link(void)
444 {
445 unsigned char sha1[20];
446 const char *git_HEAD = strdup(git_path("HEAD"));
447 const char *git_refs_heads_master = resolve_ref(git_HEAD, sha1, 1);
448 int pfxlen = strlen(git_HEAD) - 4; /* strip .../.git/ part */
449
450 if (!git_refs_heads_master)
451 return error("HEAD is not a symbolic ref");
452 if (strncmp(git_refs_heads_master + pfxlen, "refs/heads/", 11))
453 return error("HEAD points to something strange (%s)",
454 git_refs_heads_master + pfxlen);
455 if (!memcmp(null_sha1, sha1, 20))
456 return error("HEAD: not a valid git pointer");
457 return 0;
458 }
459
460 static int fsck_cache_tree(struct cache_tree *it)
461 {
462 int i;
463 int err = 0;
464
465 if (0 <= it->entry_count) {
466 struct object *obj = parse_object(it->sha1);
467 if (!obj) {
468 error("%s: invalid sha1 pointer in cache-tree",
469 sha1_to_hex(it->sha1));
470 return 1;
471 }
472 mark_reachable(obj, REACHABLE);
473 obj->used = 1;
474 if (obj->type != TYPE_TREE)
475 err |= objerror(obj, "non-tree in cache-tree");
476 }
477 for (i = 0; i < it->subtree_nr; i++)
478 err |= fsck_cache_tree(it->down[i]->cache_tree);
479 return err;
480 }
481
482 int main(int argc, char **argv)
483 {
484 int i, heads;
485
486 track_object_refs = 1;
487 setup_git_directory();
488
489 for (i = 1; i < argc; i++) {
490 const char *arg = argv[i];
491
492 if (!strcmp(arg, "--unreachable")) {
493 show_unreachable = 1;
494 continue;
495 }
496 if (!strcmp(arg, "--tags")) {
497 show_tags = 1;
498 continue;
499 }
500 if (!strcmp(arg, "--root")) {
501 show_root = 1;
502 continue;
503 }
504 if (!strcmp(arg, "--cache")) {
505 keep_cache_objects = 1;
506 continue;
507 }
508 if (!strcmp(arg, "--full")) {
509 check_full = 1;
510 continue;
511 }
512 if (!strcmp(arg, "--strict")) {
513 check_strict = 1;
514 continue;
515 }
516 if (*arg == '-')
517 usage("git-fsck-objects [--tags] [--root] [[--unreachable] [--cache] [--full] [--strict] <head-sha1>*]");
518 }
519
520 fsck_head_link();
521 fsck_object_dir(get_object_directory());
522 if (check_full) {
523 struct alternate_object_database *alt;
524 struct packed_git *p;
525 prepare_alt_odb();
526 for (alt = alt_odb_list; alt; alt = alt->next) {
527 char namebuf[PATH_MAX];
528 int namelen = alt->name - alt->base;
529 memcpy(namebuf, alt->base, namelen);
530 namebuf[namelen - 1] = 0;
531 fsck_object_dir(namebuf);
532 }
533 prepare_packed_git();
534 for (p = packed_git; p; p = p->next)
535 /* verify gives error messages itself */
536 verify_pack(p, 0);
537
538 for (p = packed_git; p; p = p->next) {
539 int num = num_packed_objects(p);
540 for (i = 0; i < num; i++) {
541 unsigned char sha1[20];
542 nth_packed_object_sha1(p, i, sha1);
543 fsck_sha1(sha1);
544 }
545 }
546 }
547
548 heads = 0;
549 for (i = 1; i < argc; i++) {
550 const char *arg = argv[i];
551
552 if (*arg == '-')
553 continue;
554
555 if (!get_sha1(arg, head_sha1)) {
556 struct object *obj = lookup_object(head_sha1);
557
558 /* Error is printed by lookup_object(). */
559 if (!obj)
560 continue;
561
562 obj->used = 1;
563 mark_reachable(obj, REACHABLE);
564 heads++;
565 continue;
566 }
567 error("invalid parameter: expected sha1, got '%s'", arg);
568 }
569
570 /*
571 * If we've not been given any explicit head information, do the
572 * default ones from .git/refs. We also consider the index file
573 * in this case (ie this implies --cache).
574 */
575 if (!heads) {
576 get_default_heads();
577 keep_cache_objects = 1;
578 }
579
580 if (keep_cache_objects) {
581 int i;
582 read_cache();
583 for (i = 0; i < active_nr; i++) {
584 struct blob *blob = lookup_blob(active_cache[i]->sha1);
585 struct object *obj;
586 if (!blob)
587 continue;
588 obj = &blob->object;
589 obj->used = 1;
590 mark_reachable(obj, REACHABLE);
591 }
592 if (active_cache_tree)
593 fsck_cache_tree(active_cache_tree);
594 }
595
596 check_connectivity();
597 return 0;
598 }