3d5ced2d3ac2e9d2fdfacd498a7592902d96ebdb
1#include "builtin.h"
2#include "cache.h"
3#include "commit.h"
4#include "tree.h"
5#include "blob.h"
6#include "tag.h"
7#include "refs.h"
8#include "pack.h"
9#include "cache-tree.h"
10#include "tree-walk.h"
11#include "fsck.h"
12#include "parse-options.h"
13#include "dir.h"
14#include "progress.h"
15#include "streaming.h"
16#include "decorate.h"
17
18#define REACHABLE 0x0001
19#define SEEN 0x0002
20#define HAS_OBJ 0x0004
21
22static int show_root;
23static int show_tags;
24static int show_unreachable;
25static int include_reflogs = 1;
26static int check_full = 1;
27static int connectivity_only;
28static int check_strict;
29static int keep_cache_objects;
30static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
31static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
32static struct object_id head_oid;
33static const char *head_points_at;
34static int errors_found;
35static int write_lost_and_found;
36static int verbose;
37static int show_progress = -1;
38static int show_dangling = 1;
39static int name_objects;
40#define ERROR_OBJECT 01
41#define ERROR_REACHABLE 02
42#define ERROR_PACK 04
43#define ERROR_REFS 010
44
45static const char *describe_object(struct object *obj)
46{
47 static struct strbuf buf = STRBUF_INIT;
48 char *name = name_objects ?
49 lookup_decoration(fsck_walk_options.object_names, obj) : NULL;
50
51 strbuf_reset(&buf);
52 strbuf_addstr(&buf, oid_to_hex(&obj->oid));
53 if (name)
54 strbuf_addf(&buf, " (%s)", name);
55
56 return buf.buf;
57}
58
59static const char *printable_type(struct object *obj)
60{
61 const char *ret;
62
63 ret = typename(obj->type);
64 if (!ret)
65 ret = "unknown";
66
67 return ret;
68}
69
70static int fsck_config(const char *var, const char *value, void *cb)
71{
72 if (strcmp(var, "fsck.skiplist") == 0) {
73 const char *path;
74 struct strbuf sb = STRBUF_INIT;
75
76 if (git_config_pathname(&path, var, value))
77 return 1;
78 strbuf_addf(&sb, "skiplist=%s", path);
79 free((char *)path);
80 fsck_set_msg_types(&fsck_obj_options, sb.buf);
81 strbuf_release(&sb);
82 return 0;
83 }
84
85 if (skip_prefix(var, "fsck.", &var)) {
86 fsck_set_msg_type(&fsck_obj_options, var, value);
87 return 0;
88 }
89
90 return git_default_config(var, value, cb);
91}
92
93static void objreport(struct object *obj, const char *msg_type,
94 const char *err)
95{
96 fprintf(stderr, "%s in %s %s: %s\n",
97 msg_type, printable_type(obj), describe_object(obj), err);
98}
99
100static int objerror(struct object *obj, const char *err)
101{
102 errors_found |= ERROR_OBJECT;
103 objreport(obj, "error", err);
104 return -1;
105}
106
107static int fsck_error_func(struct fsck_options *o,
108 struct object *obj, int type, const char *message)
109{
110 objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message);
111 return (type == FSCK_WARN) ? 0 : 1;
112}
113
114static struct object_array pending;
115
116static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
117{
118 struct object *parent = data;
119
120 /*
121 * The only case data is NULL or type is OBJ_ANY is when
122 * mark_object_reachable() calls us. All the callers of
123 * that function has non-NULL obj hence ...
124 */
125 if (!obj) {
126 /* ... these references to parent->fld are safe here */
127 printf("broken link from %7s %s\n",
128 printable_type(parent), describe_object(parent));
129 printf("broken link from %7s %s\n",
130 (type == OBJ_ANY ? "unknown" : typename(type)), "unknown");
131 errors_found |= ERROR_REACHABLE;
132 return 1;
133 }
134
135 if (type != OBJ_ANY && obj->type != type)
136 /* ... and the reference to parent is safe here */
137 objerror(parent, "wrong object type in link");
138
139 if (obj->flags & REACHABLE)
140 return 0;
141 obj->flags |= REACHABLE;
142 if (!(obj->flags & HAS_OBJ)) {
143 if (parent && !has_object_file(&obj->oid)) {
144 printf("broken link from %7s %s\n",
145 printable_type(parent), describe_object(parent));
146 printf(" to %7s %s\n",
147 printable_type(obj), describe_object(obj));
148 errors_found |= ERROR_REACHABLE;
149 }
150 return 1;
151 }
152
153 add_object_array(obj, NULL, &pending);
154 return 0;
155}
156
157static void mark_object_reachable(struct object *obj)
158{
159 mark_object(obj, OBJ_ANY, NULL, NULL);
160}
161
162static int traverse_one_object(struct object *obj)
163{
164 int result;
165 struct tree *tree = NULL;
166
167 if (obj->type == OBJ_TREE) {
168 tree = (struct tree *)obj;
169 if (parse_tree(tree) < 0)
170 return 1; /* error already displayed */
171 }
172 result = fsck_walk(obj, obj, &fsck_walk_options);
173 if (tree)
174 free_tree_buffer(tree);
175 return result;
176}
177
178static int traverse_reachable(void)
179{
180 struct progress *progress = NULL;
181 unsigned int nr = 0;
182 int result = 0;
183 if (show_progress)
184 progress = start_progress_delay(_("Checking connectivity"), 0, 0, 2);
185 while (pending.nr) {
186 struct object_array_entry *entry;
187 struct object *obj;
188
189 entry = pending.objects + --pending.nr;
190 obj = entry->item;
191 result |= traverse_one_object(obj);
192 display_progress(progress, ++nr);
193 }
194 stop_progress(&progress);
195 return !!result;
196}
197
198static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
199{
200 if (!obj)
201 return 1;
202 obj->used = 1;
203 return 0;
204}
205
206/*
207 * Check a single reachable object
208 */
209static void check_reachable_object(struct object *obj)
210{
211 /*
212 * We obviously want the object to be parsed,
213 * except if it was in a pack-file and we didn't
214 * do a full fsck
215 */
216 if (!(obj->flags & HAS_OBJ)) {
217 if (has_sha1_pack(obj->oid.hash))
218 return; /* it is in pack - forget about it */
219 printf("missing %s %s\n", printable_type(obj),
220 describe_object(obj));
221 errors_found |= ERROR_REACHABLE;
222 return;
223 }
224}
225
226/*
227 * Check a single unreachable object
228 */
229static void check_unreachable_object(struct object *obj)
230{
231 /*
232 * Missing unreachable object? Ignore it. It's not like
233 * we miss it (since it can't be reached), nor do we want
234 * to complain about it being unreachable (since it does
235 * not exist).
236 */
237 if (!(obj->flags & HAS_OBJ))
238 return;
239
240 /*
241 * Unreachable object that exists? Show it if asked to,
242 * since this is something that is prunable.
243 */
244 if (show_unreachable) {
245 printf("unreachable %s %s\n", printable_type(obj),
246 describe_object(obj));
247 return;
248 }
249
250 /*
251 * "!used" means that nothing at all points to it, including
252 * other unreachable objects. In other words, it's the "tip"
253 * of some set of unreachable objects, usually a commit that
254 * got dropped.
255 *
256 * Such starting points are more interesting than some random
257 * set of unreachable objects, so we show them even if the user
258 * hasn't asked for _all_ unreachable objects. If you have
259 * deleted a branch by mistake, this is a prime candidate to
260 * start looking at, for example.
261 */
262 if (!obj->used) {
263 if (show_dangling)
264 printf("dangling %s %s\n", printable_type(obj),
265 describe_object(obj));
266 if (write_lost_and_found) {
267 char *filename = git_pathdup("lost-found/%s/%s",
268 obj->type == OBJ_COMMIT ? "commit" : "other",
269 describe_object(obj));
270 FILE *f;
271
272 if (safe_create_leading_directories_const(filename)) {
273 error("Could not create lost-found");
274 free(filename);
275 return;
276 }
277 if (!(f = fopen(filename, "w")))
278 die_errno("Could not open '%s'", filename);
279 if (obj->type == OBJ_BLOB) {
280 if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
281 die_errno("Could not write '%s'", filename);
282 } else
283 fprintf(f, "%s\n", describe_object(obj));
284 if (fclose(f))
285 die_errno("Could not finish '%s'",
286 filename);
287 free(filename);
288 }
289 return;
290 }
291
292 /*
293 * Otherwise? It's there, it's unreachable, and some other unreachable
294 * object points to it. Ignore it - it's not interesting, and we showed
295 * all the interesting cases above.
296 */
297}
298
299static void check_object(struct object *obj)
300{
301 if (verbose)
302 fprintf(stderr, "Checking %s\n", describe_object(obj));
303
304 if (obj->flags & REACHABLE)
305 check_reachable_object(obj);
306 else
307 check_unreachable_object(obj);
308}
309
310static void check_connectivity(void)
311{
312 int i, max;
313
314 /* Traverse the pending reachable objects */
315 traverse_reachable();
316
317 /* Look up all the requirements, warn about missing objects.. */
318 max = get_max_object_index();
319 if (verbose)
320 fprintf(stderr, "Checking connectivity (%d objects)\n", max);
321
322 for (i = 0; i < max; i++) {
323 struct object *obj = get_indexed_object(i);
324
325 if (obj)
326 check_object(obj);
327 }
328}
329
330static int fsck_obj(struct object *obj)
331{
332 if (obj->flags & SEEN)
333 return 0;
334 obj->flags |= SEEN;
335
336 if (verbose)
337 fprintf(stderr, "Checking %s %s\n",
338 printable_type(obj), describe_object(obj));
339
340 if (fsck_walk(obj, NULL, &fsck_obj_options))
341 objerror(obj, "broken links");
342 if (fsck_object(obj, NULL, 0, &fsck_obj_options))
343 return -1;
344
345 if (obj->type == OBJ_TREE) {
346 struct tree *item = (struct tree *) obj;
347
348 free_tree_buffer(item);
349 }
350
351 if (obj->type == OBJ_COMMIT) {
352 struct commit *commit = (struct commit *) obj;
353
354 free_commit_buffer(commit);
355
356 if (!commit->parents && show_root)
357 printf("root %s\n", describe_object(&commit->object));
358 }
359
360 if (obj->type == OBJ_TAG) {
361 struct tag *tag = (struct tag *) obj;
362
363 if (show_tags && tag->tagged) {
364 printf("tagged %s %s", printable_type(tag->tagged),
365 describe_object(tag->tagged));
366 printf(" (%s) in %s\n", tag->tag,
367 describe_object(&tag->object));
368 }
369 }
370
371 return 0;
372}
373
374static int fsck_sha1(const unsigned char *sha1)
375{
376 struct object *obj = parse_object(sha1);
377 if (!obj) {
378 errors_found |= ERROR_OBJECT;
379 return error("%s: object corrupt or missing",
380 sha1_to_hex(sha1));
381 }
382 obj->flags |= HAS_OBJ;
383 return fsck_obj(obj);
384}
385
386static int fsck_obj_buffer(const unsigned char *sha1, enum object_type type,
387 unsigned long size, void *buffer, int *eaten)
388{
389 /*
390 * Note, buffer may be NULL if type is OBJ_BLOB. See
391 * verify_packfile(), data_valid variable for details.
392 */
393 struct object *obj;
394 obj = parse_object_buffer(sha1, type, size, buffer, eaten);
395 if (!obj) {
396 errors_found |= ERROR_OBJECT;
397 return error("%s: object corrupt or missing", sha1_to_hex(sha1));
398 }
399 obj->flags = HAS_OBJ;
400 return fsck_obj(obj);
401}
402
403static int default_refs;
404
405static void fsck_handle_reflog_sha1(const char *refname, unsigned char *sha1,
406 unsigned long timestamp)
407{
408 struct object *obj;
409
410 if (!is_null_sha1(sha1)) {
411 obj = lookup_object(sha1);
412 if (obj && (obj->flags & HAS_OBJ)) {
413 if (timestamp && name_objects)
414 add_decoration(fsck_walk_options.object_names,
415 obj,
416 xstrfmt("%s@{%ld}", refname, timestamp));
417 obj->used = 1;
418 mark_object_reachable(obj);
419 } else {
420 error("%s: invalid reflog entry %s", refname, sha1_to_hex(sha1));
421 errors_found |= ERROR_REACHABLE;
422 }
423 }
424}
425
426static int fsck_handle_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
427 const char *email, unsigned long timestamp, int tz,
428 const char *message, void *cb_data)
429{
430 const char *refname = cb_data;
431
432 if (verbose)
433 fprintf(stderr, "Checking reflog %s->%s\n",
434 sha1_to_hex(osha1), sha1_to_hex(nsha1));
435
436 fsck_handle_reflog_sha1(refname, osha1, 0);
437 fsck_handle_reflog_sha1(refname, nsha1, timestamp);
438 return 0;
439}
440
441static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
442 int flag, void *cb_data)
443{
444 for_each_reflog_ent(logname, fsck_handle_reflog_ent, (void *)logname);
445 return 0;
446}
447
448static int fsck_handle_ref(const char *refname, const struct object_id *oid,
449 int flag, void *cb_data)
450{
451 struct object *obj;
452
453 obj = parse_object(oid->hash);
454 if (!obj) {
455 error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
456 errors_found |= ERROR_REACHABLE;
457 /* We'll continue with the rest despite the error.. */
458 return 0;
459 }
460 if (obj->type != OBJ_COMMIT && is_branch(refname)) {
461 error("%s: not a commit", refname);
462 errors_found |= ERROR_REFS;
463 }
464 default_refs++;
465 obj->used = 1;
466 if (name_objects)
467 add_decoration(fsck_walk_options.object_names,
468 obj, xstrdup(refname));
469 mark_object_reachable(obj);
470
471 return 0;
472}
473
474static void get_default_heads(void)
475{
476 if (head_points_at && !is_null_oid(&head_oid))
477 fsck_handle_ref("HEAD", &head_oid, 0, NULL);
478 for_each_rawref(fsck_handle_ref, NULL);
479 if (include_reflogs)
480 for_each_reflog(fsck_handle_reflog, NULL);
481
482 /*
483 * Not having any default heads isn't really fatal, but
484 * it does mean that "--unreachable" no longer makes any
485 * sense (since in this case everything will obviously
486 * be unreachable by definition.
487 *
488 * Showing dangling objects is valid, though (as those
489 * dangling objects are likely lost heads).
490 *
491 * So we just print a warning about it, and clear the
492 * "show_unreachable" flag.
493 */
494 if (!default_refs) {
495 fprintf(stderr, "notice: No default references\n");
496 show_unreachable = 0;
497 }
498}
499
500static int fsck_loose(const unsigned char *sha1, const char *path, void *data)
501{
502 if (fsck_sha1(sha1))
503 errors_found |= ERROR_OBJECT;
504 return 0;
505}
506
507static int fsck_cruft(const char *basename, const char *path, void *data)
508{
509 if (!starts_with(basename, "tmp_obj_"))
510 fprintf(stderr, "bad sha1 file: %s\n", path);
511 return 0;
512}
513
514static int fsck_subdir(int nr, const char *path, void *progress)
515{
516 display_progress(progress, nr + 1);
517 return 0;
518}
519
520static void fsck_object_dir(const char *path)
521{
522 struct progress *progress = NULL;
523
524 if (verbose)
525 fprintf(stderr, "Checking object directory\n");
526
527 if (show_progress)
528 progress = start_progress(_("Checking object directories"), 256);
529
530 for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
531 progress);
532 display_progress(progress, 256);
533 stop_progress(&progress);
534}
535
536static int fsck_head_link(void)
537{
538 int null_is_error = 0;
539
540 if (verbose)
541 fprintf(stderr, "Checking HEAD link\n");
542
543 head_points_at = resolve_ref_unsafe("HEAD", 0, head_oid.hash, NULL);
544 if (!head_points_at) {
545 errors_found |= ERROR_REFS;
546 return error("Invalid HEAD");
547 }
548 if (!strcmp(head_points_at, "HEAD"))
549 /* detached HEAD */
550 null_is_error = 1;
551 else if (!starts_with(head_points_at, "refs/heads/")) {
552 errors_found |= ERROR_REFS;
553 return error("HEAD points to something strange (%s)",
554 head_points_at);
555 }
556 if (is_null_oid(&head_oid)) {
557 if (null_is_error) {
558 errors_found |= ERROR_REFS;
559 return error("HEAD: detached HEAD points at nothing");
560 }
561 fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
562 head_points_at + 11);
563 }
564 return 0;
565}
566
567static int fsck_cache_tree(struct cache_tree *it)
568{
569 int i;
570 int err = 0;
571
572 if (verbose)
573 fprintf(stderr, "Checking cache tree\n");
574
575 if (0 <= it->entry_count) {
576 struct object *obj = parse_object(it->sha1);
577 if (!obj) {
578 error("%s: invalid sha1 pointer in cache-tree",
579 sha1_to_hex(it->sha1));
580 errors_found |= ERROR_REFS;
581 return 1;
582 }
583 obj->used = 1;
584 if (name_objects)
585 add_decoration(fsck_walk_options.object_names,
586 obj, xstrdup(":"));
587 mark_object_reachable(obj);
588 if (obj->type != OBJ_TREE)
589 err |= objerror(obj, "non-tree in cache-tree");
590 }
591 for (i = 0; i < it->subtree_nr; i++)
592 err |= fsck_cache_tree(it->down[i]->cache_tree);
593 return err;
594}
595
596static void mark_object_for_connectivity(const unsigned char *sha1)
597{
598 struct object *obj = lookup_object(sha1);
599
600 /*
601 * Setting the object type here isn't strictly necessary for a
602 * connectivity check. In most cases, our walk will expect a certain
603 * type (e.g., a tree referencing a blob) and will use lookup_blob() to
604 * assign the type. But doing it here has two advantages:
605 *
606 * 1. When the fsck_walk code looks at objects that _don't_ come from
607 * links (e.g., the tip of a ref), it may complain about the
608 * "unknown object type".
609 *
610 * 2. This serves as a nice cross-check that the graph links are
611 * sane. So --connectivity-only does not check that the bits of
612 * blobs are not corrupted, but it _does_ check that 100644 tree
613 * entries point to blobs, and so forth.
614 *
615 * Unfortunately we can't just use parse_object() here, because the
616 * whole point of --connectivity-only is to avoid reading the object
617 * data more than necessary.
618 */
619 if (!obj || obj->type == OBJ_NONE) {
620 enum object_type type = sha1_object_info(sha1, NULL);
621 switch (type) {
622 case OBJ_BAD:
623 error("%s: unable to read object type",
624 sha1_to_hex(sha1));
625 break;
626 case OBJ_COMMIT:
627 obj = (struct object *)lookup_commit(sha1);
628 break;
629 case OBJ_TREE:
630 obj = (struct object *)lookup_tree(sha1);
631 break;
632 case OBJ_BLOB:
633 obj = (struct object *)lookup_blob(sha1);
634 break;
635 case OBJ_TAG:
636 obj = (struct object *)lookup_tag(sha1);
637 break;
638 default:
639 error("%s: unknown object type %d",
640 sha1_to_hex(sha1), type);
641 }
642
643 if (!obj || obj->type == OBJ_NONE) {
644 errors_found |= ERROR_OBJECT;
645 return;
646 }
647 }
648
649 obj->flags |= HAS_OBJ;
650}
651
652static int mark_loose_for_connectivity(const unsigned char *sha1,
653 const char *path,
654 void *data)
655{
656 mark_object_for_connectivity(sha1);
657 return 0;
658}
659
660static int mark_packed_for_connectivity(const unsigned char *sha1,
661 struct packed_git *pack,
662 uint32_t pos,
663 void *data)
664{
665 mark_object_for_connectivity(sha1);
666 return 0;
667}
668
669static char const * const fsck_usage[] = {
670 N_("git fsck [<options>] [<object>...]"),
671 NULL
672};
673
674static struct option fsck_opts[] = {
675 OPT__VERBOSE(&verbose, N_("be verbose")),
676 OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
677 OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
678 OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
679 OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
680 OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
681 OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
682 OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
683 OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
684 OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
685 OPT_BOOL(0, "lost-found", &write_lost_and_found,
686 N_("write dangling objects in .git/lost-found")),
687 OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
688 OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
689 OPT_END(),
690};
691
692int cmd_fsck(int argc, const char **argv, const char *prefix)
693{
694 int i, heads;
695 struct alternate_object_database *alt;
696
697 errors_found = 0;
698 check_replace_refs = 0;
699
700 argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
701
702 fsck_walk_options.walk = mark_object;
703 fsck_obj_options.walk = mark_used;
704 fsck_obj_options.error_func = fsck_error_func;
705 if (check_strict)
706 fsck_obj_options.strict = 1;
707
708 if (show_progress == -1)
709 show_progress = isatty(2);
710 if (verbose)
711 show_progress = 0;
712
713 if (write_lost_and_found) {
714 check_full = 1;
715 include_reflogs = 0;
716 }
717
718 if (name_objects)
719 fsck_walk_options.object_names =
720 xcalloc(1, sizeof(struct decoration));
721
722 git_config(fsck_config, NULL);
723
724 fsck_head_link();
725 if (connectivity_only) {
726 for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
727 for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
728 } else {
729 fsck_object_dir(get_object_directory());
730
731 prepare_alt_odb();
732 for (alt = alt_odb_list; alt; alt = alt->next)
733 fsck_object_dir(alt->path);
734
735 if (check_full) {
736 struct packed_git *p;
737 uint32_t total = 0, count = 0;
738 struct progress *progress = NULL;
739
740 prepare_packed_git();
741
742 if (show_progress) {
743 for (p = packed_git; p; p = p->next) {
744 if (open_pack_index(p))
745 continue;
746 total += p->num_objects;
747 }
748
749 progress = start_progress(_("Checking objects"), total);
750 }
751 for (p = packed_git; p; p = p->next) {
752 /* verify gives error messages itself */
753 if (verify_pack(p, fsck_obj_buffer,
754 progress, count))
755 errors_found |= ERROR_PACK;
756 count += p->num_objects;
757 }
758 stop_progress(&progress);
759 }
760 }
761
762 heads = 0;
763 for (i = 0; i < argc; i++) {
764 const char *arg = argv[i];
765 unsigned char sha1[20];
766 if (!get_sha1(arg, sha1)) {
767 struct object *obj = lookup_object(sha1);
768
769 if (!obj || !(obj->flags & HAS_OBJ)) {
770 error("%s: object missing", sha1_to_hex(sha1));
771 errors_found |= ERROR_OBJECT;
772 continue;
773 }
774
775 obj->used = 1;
776 if (name_objects)
777 add_decoration(fsck_walk_options.object_names,
778 obj, xstrdup(arg));
779 mark_object_reachable(obj);
780 heads++;
781 continue;
782 }
783 error("invalid parameter: expected sha1, got '%s'", arg);
784 errors_found |= ERROR_OBJECT;
785 }
786
787 /*
788 * If we've not been given any explicit head information, do the
789 * default ones from .git/refs. We also consider the index file
790 * in this case (ie this implies --cache).
791 */
792 if (!argc) {
793 get_default_heads();
794 keep_cache_objects = 1;
795 }
796
797 if (keep_cache_objects) {
798 read_cache();
799 for (i = 0; i < active_nr; i++) {
800 unsigned int mode;
801 struct blob *blob;
802 struct object *obj;
803
804 mode = active_cache[i]->ce_mode;
805 if (S_ISGITLINK(mode))
806 continue;
807 blob = lookup_blob(active_cache[i]->oid.hash);
808 if (!blob)
809 continue;
810 obj = &blob->object;
811 obj->used = 1;
812 if (name_objects)
813 add_decoration(fsck_walk_options.object_names,
814 obj,
815 xstrfmt(":%s", active_cache[i]->name));
816 mark_object_reachable(obj);
817 }
818 if (active_cache_tree)
819 fsck_cache_tree(active_cache_tree);
820 }
821
822 check_connectivity();
823 return errors_found;
824}