Merge branch 'sg/setup-doc-update'
[git] / builtin / fsck.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "config.h"
4 #include "commit.h"
5 #include "tree.h"
6 #include "blob.h"
7 #include "tag.h"
8 #include "refs.h"
9 #include "pack.h"
10 #include "cache-tree.h"
11 #include "tree-walk.h"
12 #include "fsck.h"
13 #include "parse-options.h"
14 #include "dir.h"
15 #include "progress.h"
16 #include "streaming.h"
17 #include "decorate.h"
18 #include "packfile.h"
19
20 #define REACHABLE 0x0001
21 #define SEEN      0x0002
22 #define HAS_OBJ   0x0004
23 /* This flag is set if something points to this object. */
24 #define USED      0x0008
25
26 static int show_root;
27 static int show_tags;
28 static int show_unreachable;
29 static int include_reflogs = 1;
30 static int check_full = 1;
31 static int connectivity_only;
32 static int check_strict;
33 static int keep_cache_objects;
34 static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
35 static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
36 static struct object_id head_oid;
37 static const char *head_points_at;
38 static int errors_found;
39 static int write_lost_and_found;
40 static int verbose;
41 static int show_progress = -1;
42 static int show_dangling = 1;
43 static int name_objects;
44 #define ERROR_OBJECT 01
45 #define ERROR_REACHABLE 02
46 #define ERROR_PACK 04
47 #define ERROR_REFS 010
48
49 static const char *describe_object(struct object *obj)
50 {
51         static struct strbuf buf = STRBUF_INIT;
52         char *name = name_objects ?
53                 lookup_decoration(fsck_walk_options.object_names, obj) : NULL;
54
55         strbuf_reset(&buf);
56         strbuf_addstr(&buf, oid_to_hex(&obj->oid));
57         if (name)
58                 strbuf_addf(&buf, " (%s)", name);
59
60         return buf.buf;
61 }
62
63 static const char *printable_type(struct object *obj)
64 {
65         const char *ret;
66
67         if (obj->type == OBJ_NONE) {
68                 enum object_type type = sha1_object_info(obj->oid.hash, NULL);
69                 if (type > 0)
70                         object_as_type(obj, type, 0);
71         }
72
73         ret = typename(obj->type);
74         if (!ret)
75                 ret = "unknown";
76
77         return ret;
78 }
79
80 static int fsck_config(const char *var, const char *value, void *cb)
81 {
82         if (strcmp(var, "fsck.skiplist") == 0) {
83                 const char *path;
84                 struct strbuf sb = STRBUF_INIT;
85
86                 if (git_config_pathname(&path, var, value))
87                         return 1;
88                 strbuf_addf(&sb, "skiplist=%s", path);
89                 free((char *)path);
90                 fsck_set_msg_types(&fsck_obj_options, sb.buf);
91                 strbuf_release(&sb);
92                 return 0;
93         }
94
95         if (skip_prefix(var, "fsck.", &var)) {
96                 fsck_set_msg_type(&fsck_obj_options, var, value);
97                 return 0;
98         }
99
100         return git_default_config(var, value, cb);
101 }
102
103 static void objreport(struct object *obj, const char *msg_type,
104                         const char *err)
105 {
106         fprintf(stderr, "%s in %s %s: %s\n",
107                 msg_type, printable_type(obj), describe_object(obj), err);
108 }
109
110 static int objerror(struct object *obj, const char *err)
111 {
112         errors_found |= ERROR_OBJECT;
113         objreport(obj, "error", err);
114         return -1;
115 }
116
117 static int fsck_error_func(struct fsck_options *o,
118         struct object *obj, int type, const char *message)
119 {
120         objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message);
121         return (type == FSCK_WARN) ? 0 : 1;
122 }
123
124 static struct object_array pending;
125
126 static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
127 {
128         struct object *parent = data;
129
130         /*
131          * The only case data is NULL or type is OBJ_ANY is when
132          * mark_object_reachable() calls us.  All the callers of
133          * that function has non-NULL obj hence ...
134          */
135         if (!obj) {
136                 /* ... these references to parent->fld are safe here */
137                 printf("broken link from %7s %s\n",
138                            printable_type(parent), describe_object(parent));
139                 printf("broken link from %7s %s\n",
140                            (type == OBJ_ANY ? "unknown" : typename(type)), "unknown");
141                 errors_found |= ERROR_REACHABLE;
142                 return 1;
143         }
144
145         if (type != OBJ_ANY && obj->type != type)
146                 /* ... and the reference to parent is safe here */
147                 objerror(parent, "wrong object type in link");
148
149         if (obj->flags & REACHABLE)
150                 return 0;
151         obj->flags |= REACHABLE;
152         if (!(obj->flags & HAS_OBJ)) {
153                 if (parent && !has_object_file(&obj->oid)) {
154                         printf("broken link from %7s %s\n",
155                                  printable_type(parent), describe_object(parent));
156                         printf("              to %7s %s\n",
157                                  printable_type(obj), describe_object(obj));
158                         errors_found |= ERROR_REACHABLE;
159                 }
160                 return 1;
161         }
162
163         add_object_array(obj, NULL, &pending);
164         return 0;
165 }
166
167 static void mark_object_reachable(struct object *obj)
168 {
169         mark_object(obj, OBJ_ANY, NULL, NULL);
170 }
171
172 static int traverse_one_object(struct object *obj)
173 {
174         return fsck_walk(obj, obj, &fsck_walk_options);
175 }
176
177 static int traverse_reachable(void)
178 {
179         struct progress *progress = NULL;
180         unsigned int nr = 0;
181         int result = 0;
182         if (show_progress)
183                 progress = start_delayed_progress(_("Checking connectivity"), 0);
184         while (pending.nr) {
185                 result |= traverse_one_object(object_array_pop(&pending));
186                 display_progress(progress, ++nr);
187         }
188         stop_progress(&progress);
189         return !!result;
190 }
191
192 static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
193 {
194         if (!obj)
195                 return 1;
196         obj->flags |= USED;
197         return 0;
198 }
199
200 /*
201  * Check a single reachable object
202  */
203 static void check_reachable_object(struct object *obj)
204 {
205         /*
206          * We obviously want the object to be parsed,
207          * except if it was in a pack-file and we didn't
208          * do a full fsck
209          */
210         if (!(obj->flags & HAS_OBJ)) {
211                 if (has_sha1_pack(obj->oid.hash))
212                         return; /* it is in pack - forget about it */
213                 printf("missing %s %s\n", printable_type(obj),
214                         describe_object(obj));
215                 errors_found |= ERROR_REACHABLE;
216                 return;
217         }
218 }
219
220 /*
221  * Check a single unreachable object
222  */
223 static void check_unreachable_object(struct object *obj)
224 {
225         /*
226          * Missing unreachable object? Ignore it. It's not like
227          * we miss it (since it can't be reached), nor do we want
228          * to complain about it being unreachable (since it does
229          * not exist).
230          */
231         if (!(obj->flags & HAS_OBJ))
232                 return;
233
234         /*
235          * Unreachable object that exists? Show it if asked to,
236          * since this is something that is prunable.
237          */
238         if (show_unreachable) {
239                 printf("unreachable %s %s\n", printable_type(obj),
240                         describe_object(obj));
241                 return;
242         }
243
244         /*
245          * "!USED" means that nothing at all points to it, including
246          * other unreachable objects. In other words, it's the "tip"
247          * of some set of unreachable objects, usually a commit that
248          * got dropped.
249          *
250          * Such starting points are more interesting than some random
251          * set of unreachable objects, so we show them even if the user
252          * hasn't asked for _all_ unreachable objects. If you have
253          * deleted a branch by mistake, this is a prime candidate to
254          * start looking at, for example.
255          */
256         if (!(obj->flags & USED)) {
257                 if (show_dangling)
258                         printf("dangling %s %s\n", printable_type(obj),
259                                describe_object(obj));
260                 if (write_lost_and_found) {
261                         char *filename = git_pathdup("lost-found/%s/%s",
262                                 obj->type == OBJ_COMMIT ? "commit" : "other",
263                                 describe_object(obj));
264                         FILE *f;
265
266                         if (safe_create_leading_directories_const(filename)) {
267                                 error("Could not create lost-found");
268                                 free(filename);
269                                 return;
270                         }
271                         f = xfopen(filename, "w");
272                         if (obj->type == OBJ_BLOB) {
273                                 if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
274                                         die_errno("Could not write '%s'", filename);
275                         } else
276                                 fprintf(f, "%s\n", describe_object(obj));
277                         if (fclose(f))
278                                 die_errno("Could not finish '%s'",
279                                           filename);
280                         free(filename);
281                 }
282                 return;
283         }
284
285         /*
286          * Otherwise? It's there, it's unreachable, and some other unreachable
287          * object points to it. Ignore it - it's not interesting, and we showed
288          * all the interesting cases above.
289          */
290 }
291
292 static void check_object(struct object *obj)
293 {
294         if (verbose)
295                 fprintf(stderr, "Checking %s\n", describe_object(obj));
296
297         if (obj->flags & REACHABLE)
298                 check_reachable_object(obj);
299         else
300                 check_unreachable_object(obj);
301 }
302
303 static void check_connectivity(void)
304 {
305         int i, max;
306
307         /* Traverse the pending reachable objects */
308         traverse_reachable();
309
310         /* Look up all the requirements, warn about missing objects.. */
311         max = get_max_object_index();
312         if (verbose)
313                 fprintf(stderr, "Checking connectivity (%d objects)\n", max);
314
315         for (i = 0; i < max; i++) {
316                 struct object *obj = get_indexed_object(i);
317
318                 if (obj)
319                         check_object(obj);
320         }
321 }
322
323 static int fsck_obj(struct object *obj)
324 {
325         int err;
326
327         if (obj->flags & SEEN)
328                 return 0;
329         obj->flags |= SEEN;
330
331         if (verbose)
332                 fprintf(stderr, "Checking %s %s\n",
333                         printable_type(obj), describe_object(obj));
334
335         if (fsck_walk(obj, NULL, &fsck_obj_options))
336                 objerror(obj, "broken links");
337         err = fsck_object(obj, NULL, 0, &fsck_obj_options);
338         if (err)
339                 goto out;
340
341         if (obj->type == OBJ_COMMIT) {
342                 struct commit *commit = (struct commit *) obj;
343
344                 if (!commit->parents && show_root)
345                         printf("root %s\n", describe_object(&commit->object));
346         }
347
348         if (obj->type == OBJ_TAG) {
349                 struct tag *tag = (struct tag *) obj;
350
351                 if (show_tags && tag->tagged) {
352                         printf("tagged %s %s", printable_type(tag->tagged),
353                                 describe_object(tag->tagged));
354                         printf(" (%s) in %s\n", tag->tag,
355                                 describe_object(&tag->object));
356                 }
357         }
358
359 out:
360         if (obj->type == OBJ_TREE)
361                 free_tree_buffer((struct tree *)obj);
362         if (obj->type == OBJ_COMMIT)
363                 free_commit_buffer((struct commit *)obj);
364         return err;
365 }
366
367 static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
368                            unsigned long size, void *buffer, int *eaten)
369 {
370         /*
371          * Note, buffer may be NULL if type is OBJ_BLOB. See
372          * verify_packfile(), data_valid variable for details.
373          */
374         struct object *obj;
375         obj = parse_object_buffer(oid, type, size, buffer, eaten);
376         if (!obj) {
377                 errors_found |= ERROR_OBJECT;
378                 return error("%s: object corrupt or missing", oid_to_hex(oid));
379         }
380         obj->flags &= ~(REACHABLE | SEEN);
381         obj->flags |= HAS_OBJ;
382         return fsck_obj(obj);
383 }
384
385 static int default_refs;
386
387 static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
388         timestamp_t timestamp)
389 {
390         struct object *obj;
391
392         if (!is_null_oid(oid)) {
393                 obj = lookup_object(oid->hash);
394                 if (obj && (obj->flags & HAS_OBJ)) {
395                         if (timestamp && name_objects)
396                                 add_decoration(fsck_walk_options.object_names,
397                                         obj,
398                                         xstrfmt("%s@{%"PRItime"}", refname, timestamp));
399                         obj->flags |= USED;
400                         mark_object_reachable(obj);
401                 } else {
402                         error("%s: invalid reflog entry %s", refname, oid_to_hex(oid));
403                         errors_found |= ERROR_REACHABLE;
404                 }
405         }
406 }
407
408 static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid,
409                 const char *email, timestamp_t timestamp, int tz,
410                 const char *message, void *cb_data)
411 {
412         const char *refname = cb_data;
413
414         if (verbose)
415                 fprintf(stderr, "Checking reflog %s->%s\n",
416                         oid_to_hex(ooid), oid_to_hex(noid));
417
418         fsck_handle_reflog_oid(refname, ooid, 0);
419         fsck_handle_reflog_oid(refname, noid, timestamp);
420         return 0;
421 }
422
423 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
424                               int flag, void *cb_data)
425 {
426         for_each_reflog_ent(logname, fsck_handle_reflog_ent, (void *)logname);
427         return 0;
428 }
429
430 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
431                            int flag, void *cb_data)
432 {
433         struct object *obj;
434
435         obj = parse_object(oid);
436         if (!obj) {
437                 error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
438                 errors_found |= ERROR_REACHABLE;
439                 /* We'll continue with the rest despite the error.. */
440                 return 0;
441         }
442         if (obj->type != OBJ_COMMIT && is_branch(refname)) {
443                 error("%s: not a commit", refname);
444                 errors_found |= ERROR_REFS;
445         }
446         default_refs++;
447         obj->flags |= USED;
448         if (name_objects)
449                 add_decoration(fsck_walk_options.object_names,
450                         obj, xstrdup(refname));
451         mark_object_reachable(obj);
452
453         return 0;
454 }
455
456 static void get_default_heads(void)
457 {
458         if (head_points_at && !is_null_oid(&head_oid))
459                 fsck_handle_ref("HEAD", &head_oid, 0, NULL);
460         for_each_rawref(fsck_handle_ref, NULL);
461         if (include_reflogs)
462                 for_each_reflog(fsck_handle_reflog, NULL);
463
464         /*
465          * Not having any default heads isn't really fatal, but
466          * it does mean that "--unreachable" no longer makes any
467          * sense (since in this case everything will obviously
468          * be unreachable by definition.
469          *
470          * Showing dangling objects is valid, though (as those
471          * dangling objects are likely lost heads).
472          *
473          * So we just print a warning about it, and clear the
474          * "show_unreachable" flag.
475          */
476         if (!default_refs) {
477                 fprintf(stderr, "notice: No default references\n");
478                 show_unreachable = 0;
479         }
480 }
481
482 static struct object *parse_loose_object(const struct object_id *oid,
483                                          const char *path)
484 {
485         struct object *obj;
486         void *contents;
487         enum object_type type;
488         unsigned long size;
489         int eaten;
490
491         if (read_loose_object(path, oid->hash, &type, &size, &contents) < 0)
492                 return NULL;
493
494         if (!contents && type != OBJ_BLOB)
495                 die("BUG: read_loose_object streamed a non-blob");
496
497         obj = parse_object_buffer(oid, type, size, contents, &eaten);
498
499         if (!eaten)
500                 free(contents);
501         return obj;
502 }
503
504 static int fsck_loose(const struct object_id *oid, const char *path, void *data)
505 {
506         struct object *obj = parse_loose_object(oid, path);
507
508         if (!obj) {
509                 errors_found |= ERROR_OBJECT;
510                 error("%s: object corrupt or missing: %s",
511                       oid_to_hex(oid), path);
512                 return 0; /* keep checking other objects */
513         }
514
515         obj->flags &= ~(REACHABLE | SEEN);
516         obj->flags |= HAS_OBJ;
517         if (fsck_obj(obj))
518                 errors_found |= ERROR_OBJECT;
519         return 0;
520 }
521
522 static int fsck_cruft(const char *basename, const char *path, void *data)
523 {
524         if (!starts_with(basename, "tmp_obj_"))
525                 fprintf(stderr, "bad sha1 file: %s\n", path);
526         return 0;
527 }
528
529 static int fsck_subdir(unsigned int nr, const char *path, void *progress)
530 {
531         display_progress(progress, nr + 1);
532         return 0;
533 }
534
535 static void fsck_object_dir(const char *path)
536 {
537         struct progress *progress = NULL;
538
539         if (verbose)
540                 fprintf(stderr, "Checking object directory\n");
541
542         if (show_progress)
543                 progress = start_progress(_("Checking object directories"), 256);
544
545         for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
546                                       progress);
547         display_progress(progress, 256);
548         stop_progress(&progress);
549 }
550
551 static int fsck_head_link(void)
552 {
553         int null_is_error = 0;
554
555         if (verbose)
556                 fprintf(stderr, "Checking HEAD link\n");
557
558         head_points_at = resolve_ref_unsafe("HEAD", 0, &head_oid, NULL);
559         if (!head_points_at) {
560                 errors_found |= ERROR_REFS;
561                 return error("Invalid HEAD");
562         }
563         if (!strcmp(head_points_at, "HEAD"))
564                 /* detached HEAD */
565                 null_is_error = 1;
566         else if (!starts_with(head_points_at, "refs/heads/")) {
567                 errors_found |= ERROR_REFS;
568                 return error("HEAD points to something strange (%s)",
569                              head_points_at);
570         }
571         if (is_null_oid(&head_oid)) {
572                 if (null_is_error) {
573                         errors_found |= ERROR_REFS;
574                         return error("HEAD: detached HEAD points at nothing");
575                 }
576                 fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
577                         head_points_at + 11);
578         }
579         return 0;
580 }
581
582 static int fsck_cache_tree(struct cache_tree *it)
583 {
584         int i;
585         int err = 0;
586
587         if (verbose)
588                 fprintf(stderr, "Checking cache tree\n");
589
590         if (0 <= it->entry_count) {
591                 struct object *obj = parse_object(&it->oid);
592                 if (!obj) {
593                         error("%s: invalid sha1 pointer in cache-tree",
594                               oid_to_hex(&it->oid));
595                         errors_found |= ERROR_REFS;
596                         return 1;
597                 }
598                 obj->flags |= USED;
599                 if (name_objects)
600                         add_decoration(fsck_walk_options.object_names,
601                                 obj, xstrdup(":"));
602                 mark_object_reachable(obj);
603                 if (obj->type != OBJ_TREE)
604                         err |= objerror(obj, "non-tree in cache-tree");
605         }
606         for (i = 0; i < it->subtree_nr; i++)
607                 err |= fsck_cache_tree(it->down[i]->cache_tree);
608         return err;
609 }
610
611 static void mark_object_for_connectivity(const struct object_id *oid)
612 {
613         struct object *obj = lookup_unknown_object(oid->hash);
614         obj->flags |= HAS_OBJ;
615 }
616
617 static int mark_loose_for_connectivity(const struct object_id *oid,
618                                        const char *path,
619                                        void *data)
620 {
621         mark_object_for_connectivity(oid);
622         return 0;
623 }
624
625 static int mark_packed_for_connectivity(const struct object_id *oid,
626                                         struct packed_git *pack,
627                                         uint32_t pos,
628                                         void *data)
629 {
630         mark_object_for_connectivity(oid);
631         return 0;
632 }
633
634 static char const * const fsck_usage[] = {
635         N_("git fsck [<options>] [<object>...]"),
636         NULL
637 };
638
639 static struct option fsck_opts[] = {
640         OPT__VERBOSE(&verbose, N_("be verbose")),
641         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
642         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
643         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
644         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
645         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
646         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
647         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
648         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
649         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
650         OPT_BOOL(0, "lost-found", &write_lost_and_found,
651                                 N_("write dangling objects in .git/lost-found")),
652         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
653         OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
654         OPT_END(),
655 };
656
657 int cmd_fsck(int argc, const char **argv, const char *prefix)
658 {
659         int i;
660         struct alternate_object_database *alt;
661
662         errors_found = 0;
663         check_replace_refs = 0;
664
665         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
666
667         fsck_walk_options.walk = mark_object;
668         fsck_obj_options.walk = mark_used;
669         fsck_obj_options.error_func = fsck_error_func;
670         if (check_strict)
671                 fsck_obj_options.strict = 1;
672
673         if (show_progress == -1)
674                 show_progress = isatty(2);
675         if (verbose)
676                 show_progress = 0;
677
678         if (write_lost_and_found) {
679                 check_full = 1;
680                 include_reflogs = 0;
681         }
682
683         if (name_objects)
684                 fsck_walk_options.object_names =
685                         xcalloc(1, sizeof(struct decoration));
686
687         git_config(fsck_config, NULL);
688
689         fsck_head_link();
690         if (connectivity_only) {
691                 for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
692                 for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
693         } else {
694                 fsck_object_dir(get_object_directory());
695
696                 prepare_alt_odb();
697                 for (alt = alt_odb_list; alt; alt = alt->next)
698                         fsck_object_dir(alt->path);
699
700                 if (check_full) {
701                         struct packed_git *p;
702                         uint32_t total = 0, count = 0;
703                         struct progress *progress = NULL;
704
705                         prepare_packed_git();
706
707                         if (show_progress) {
708                                 for (p = packed_git; p; p = p->next) {
709                                         if (open_pack_index(p))
710                                                 continue;
711                                         total += p->num_objects;
712                                 }
713
714                                 progress = start_progress(_("Checking objects"), total);
715                         }
716                         for (p = packed_git; p; p = p->next) {
717                                 /* verify gives error messages itself */
718                                 if (verify_pack(p, fsck_obj_buffer,
719                                                 progress, count))
720                                         errors_found |= ERROR_PACK;
721                                 count += p->num_objects;
722                         }
723                         stop_progress(&progress);
724                 }
725         }
726
727         for (i = 0; i < argc; i++) {
728                 const char *arg = argv[i];
729                 struct object_id oid;
730                 if (!get_oid(arg, &oid)) {
731                         struct object *obj = lookup_object(oid.hash);
732
733                         if (!obj || !(obj->flags & HAS_OBJ)) {
734                                 error("%s: object missing", oid_to_hex(&oid));
735                                 errors_found |= ERROR_OBJECT;
736                                 continue;
737                         }
738
739                         obj->flags |= USED;
740                         if (name_objects)
741                                 add_decoration(fsck_walk_options.object_names,
742                                         obj, xstrdup(arg));
743                         mark_object_reachable(obj);
744                         continue;
745                 }
746                 error("invalid parameter: expected sha1, got '%s'", arg);
747                 errors_found |= ERROR_OBJECT;
748         }
749
750         /*
751          * If we've not been given any explicit head information, do the
752          * default ones from .git/refs. We also consider the index file
753          * in this case (ie this implies --cache).
754          */
755         if (!argc) {
756                 get_default_heads();
757                 keep_cache_objects = 1;
758         }
759
760         if (keep_cache_objects) {
761                 verify_index_checksum = 1;
762                 verify_ce_order = 1;
763                 read_cache();
764                 for (i = 0; i < active_nr; i++) {
765                         unsigned int mode;
766                         struct blob *blob;
767                         struct object *obj;
768
769                         mode = active_cache[i]->ce_mode;
770                         if (S_ISGITLINK(mode))
771                                 continue;
772                         blob = lookup_blob(&active_cache[i]->oid);
773                         if (!blob)
774                                 continue;
775                         obj = &blob->object;
776                         obj->flags |= USED;
777                         if (name_objects)
778                                 add_decoration(fsck_walk_options.object_names,
779                                         obj,
780                                         xstrfmt(":%s", active_cache[i]->name));
781                         mark_object_reachable(obj);
782                 }
783                 if (active_cache_tree)
784                         fsck_cache_tree(active_cache_tree);
785         }
786
787         check_connectivity();
788         return errors_found;
789 }