Merge branch 'ds/reachable'
[git] / builtin / fsck.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "repository.h"
4 #include "config.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 #include "fsck.h"
14 #include "parse-options.h"
15 #include "dir.h"
16 #include "progress.h"
17 #include "streaming.h"
18 #include "decorate.h"
19 #include "packfile.h"
20 #include "object-store.h"
21 #include "run-command.h"
22
23 #define REACHABLE 0x0001
24 #define SEEN      0x0002
25 #define HAS_OBJ   0x0004
26 /* This flag is set if something points to this object. */
27 #define USED      0x0008
28
29 static int show_root;
30 static int show_tags;
31 static int show_unreachable;
32 static int include_reflogs = 1;
33 static int check_full = 1;
34 static int connectivity_only;
35 static int check_strict;
36 static int keep_cache_objects;
37 static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
38 static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
39 static struct object_id head_oid;
40 static const char *head_points_at;
41 static int errors_found;
42 static int write_lost_and_found;
43 static int verbose;
44 static int show_progress = -1;
45 static int show_dangling = 1;
46 static int name_objects;
47 #define ERROR_OBJECT 01
48 #define ERROR_REACHABLE 02
49 #define ERROR_PACK 04
50 #define ERROR_REFS 010
51 #define ERROR_COMMIT_GRAPH 020
52
53 static const char *describe_object(struct object *obj)
54 {
55         static struct strbuf buf = STRBUF_INIT;
56         char *name = name_objects ?
57                 lookup_decoration(fsck_walk_options.object_names, obj) : NULL;
58
59         strbuf_reset(&buf);
60         strbuf_addstr(&buf, oid_to_hex(&obj->oid));
61         if (name)
62                 strbuf_addf(&buf, " (%s)", name);
63
64         return buf.buf;
65 }
66
67 static const char *printable_type(struct object *obj)
68 {
69         const char *ret;
70
71         if (obj->type == OBJ_NONE) {
72                 enum object_type type = oid_object_info(the_repository,
73                                                         &obj->oid, NULL);
74                 if (type > 0)
75                         object_as_type(the_repository, obj, type, 0);
76         }
77
78         ret = type_name(obj->type);
79         if (!ret)
80                 ret = "unknown";
81
82         return ret;
83 }
84
85 static int fsck_config(const char *var, const char *value, void *cb)
86 {
87         if (strcmp(var, "fsck.skiplist") == 0) {
88                 const char *path;
89                 struct strbuf sb = STRBUF_INIT;
90
91                 if (git_config_pathname(&path, var, value))
92                         return 1;
93                 strbuf_addf(&sb, "skiplist=%s", path);
94                 free((char *)path);
95                 fsck_set_msg_types(&fsck_obj_options, sb.buf);
96                 strbuf_release(&sb);
97                 return 0;
98         }
99
100         if (skip_prefix(var, "fsck.", &var)) {
101                 fsck_set_msg_type(&fsck_obj_options, var, value);
102                 return 0;
103         }
104
105         return git_default_config(var, value, cb);
106 }
107
108 static void objreport(struct object *obj, const char *msg_type,
109                         const char *err)
110 {
111         fprintf(stderr, "%s in %s %s: %s\n",
112                 msg_type, printable_type(obj), describe_object(obj), err);
113 }
114
115 static int objerror(struct object *obj, const char *err)
116 {
117         errors_found |= ERROR_OBJECT;
118         objreport(obj, "error", err);
119         return -1;
120 }
121
122 static int fsck_error_func(struct fsck_options *o,
123         struct object *obj, int type, const char *message)
124 {
125         objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message);
126         return (type == FSCK_WARN) ? 0 : 1;
127 }
128
129 static struct object_array pending;
130
131 static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
132 {
133         struct object *parent = data;
134
135         /*
136          * The only case data is NULL or type is OBJ_ANY is when
137          * mark_object_reachable() calls us.  All the callers of
138          * that function has non-NULL obj hence ...
139          */
140         if (!obj) {
141                 /* ... these references to parent->fld are safe here */
142                 printf("broken link from %7s %s\n",
143                            printable_type(parent), describe_object(parent));
144                 printf("broken link from %7s %s\n",
145                            (type == OBJ_ANY ? "unknown" : type_name(type)), "unknown");
146                 errors_found |= ERROR_REACHABLE;
147                 return 1;
148         }
149
150         if (type != OBJ_ANY && obj->type != type)
151                 /* ... and the reference to parent is safe here */
152                 objerror(parent, "wrong object type in link");
153
154         if (obj->flags & REACHABLE)
155                 return 0;
156         obj->flags |= REACHABLE;
157
158         if (is_promisor_object(&obj->oid))
159                 /*
160                  * Further recursion does not need to be performed on this
161                  * object since it is a promisor object (so it does not need to
162                  * be added to "pending").
163                  */
164                 return 0;
165
166         if (!(obj->flags & HAS_OBJ)) {
167                 if (parent && !has_object_file(&obj->oid)) {
168                         printf("broken link from %7s %s\n",
169                                  printable_type(parent), describe_object(parent));
170                         printf("              to %7s %s\n",
171                                  printable_type(obj), describe_object(obj));
172                         errors_found |= ERROR_REACHABLE;
173                 }
174                 return 1;
175         }
176
177         add_object_array(obj, NULL, &pending);
178         return 0;
179 }
180
181 static void mark_object_reachable(struct object *obj)
182 {
183         mark_object(obj, OBJ_ANY, NULL, NULL);
184 }
185
186 static int traverse_one_object(struct object *obj)
187 {
188         int result = fsck_walk(obj, obj, &fsck_walk_options);
189
190         if (obj->type == OBJ_TREE) {
191                 struct tree *tree = (struct tree *)obj;
192                 free_tree_buffer(tree);
193         }
194         return result;
195 }
196
197 static int traverse_reachable(void)
198 {
199         struct progress *progress = NULL;
200         unsigned int nr = 0;
201         int result = 0;
202         if (show_progress)
203                 progress = start_delayed_progress(_("Checking connectivity"), 0);
204         while (pending.nr) {
205                 result |= traverse_one_object(object_array_pop(&pending));
206                 display_progress(progress, ++nr);
207         }
208         stop_progress(&progress);
209         return !!result;
210 }
211
212 static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
213 {
214         if (!obj)
215                 return 1;
216         obj->flags |= USED;
217         return 0;
218 }
219
220 /*
221  * Check a single reachable object
222  */
223 static void check_reachable_object(struct object *obj)
224 {
225         /*
226          * We obviously want the object to be parsed,
227          * except if it was in a pack-file and we didn't
228          * do a full fsck
229          */
230         if (!(obj->flags & HAS_OBJ)) {
231                 if (is_promisor_object(&obj->oid))
232                         return;
233                 if (has_object_pack(&obj->oid))
234                         return; /* it is in pack - forget about it */
235                 printf("missing %s %s\n", printable_type(obj),
236                         describe_object(obj));
237                 errors_found |= ERROR_REACHABLE;
238                 return;
239         }
240 }
241
242 /*
243  * Check a single unreachable object
244  */
245 static void check_unreachable_object(struct object *obj)
246 {
247         /*
248          * Missing unreachable object? Ignore it. It's not like
249          * we miss it (since it can't be reached), nor do we want
250          * to complain about it being unreachable (since it does
251          * not exist).
252          */
253         if (!(obj->flags & HAS_OBJ))
254                 return;
255
256         /*
257          * Unreachable object that exists? Show it if asked to,
258          * since this is something that is prunable.
259          */
260         if (show_unreachable) {
261                 printf("unreachable %s %s\n", printable_type(obj),
262                         describe_object(obj));
263                 return;
264         }
265
266         /*
267          * "!USED" means that nothing at all points to it, including
268          * other unreachable objects. In other words, it's the "tip"
269          * of some set of unreachable objects, usually a commit that
270          * got dropped.
271          *
272          * Such starting points are more interesting than some random
273          * set of unreachable objects, so we show them even if the user
274          * hasn't asked for _all_ unreachable objects. If you have
275          * deleted a branch by mistake, this is a prime candidate to
276          * start looking at, for example.
277          */
278         if (!(obj->flags & USED)) {
279                 if (show_dangling)
280                         printf("dangling %s %s\n", printable_type(obj),
281                                describe_object(obj));
282                 if (write_lost_and_found) {
283                         char *filename = git_pathdup("lost-found/%s/%s",
284                                 obj->type == OBJ_COMMIT ? "commit" : "other",
285                                 describe_object(obj));
286                         FILE *f;
287
288                         if (safe_create_leading_directories_const(filename)) {
289                                 error("Could not create lost-found");
290                                 free(filename);
291                                 return;
292                         }
293                         f = xfopen(filename, "w");
294                         if (obj->type == OBJ_BLOB) {
295                                 if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
296                                         die_errno("Could not write '%s'", filename);
297                         } else
298                                 fprintf(f, "%s\n", describe_object(obj));
299                         if (fclose(f))
300                                 die_errno("Could not finish '%s'",
301                                           filename);
302                         free(filename);
303                 }
304                 return;
305         }
306
307         /*
308          * Otherwise? It's there, it's unreachable, and some other unreachable
309          * object points to it. Ignore it - it's not interesting, and we showed
310          * all the interesting cases above.
311          */
312 }
313
314 static void check_object(struct object *obj)
315 {
316         if (verbose)
317                 fprintf(stderr, "Checking %s\n", describe_object(obj));
318
319         if (obj->flags & REACHABLE)
320                 check_reachable_object(obj);
321         else
322                 check_unreachable_object(obj);
323 }
324
325 static void check_connectivity(void)
326 {
327         int i, max;
328
329         /* Traverse the pending reachable objects */
330         traverse_reachable();
331
332         /* Look up all the requirements, warn about missing objects.. */
333         max = get_max_object_index();
334         if (verbose)
335                 fprintf(stderr, "Checking connectivity (%d objects)\n", max);
336
337         for (i = 0; i < max; i++) {
338                 struct object *obj = get_indexed_object(i);
339
340                 if (obj)
341                         check_object(obj);
342         }
343 }
344
345 static int fsck_obj(struct object *obj, void *buffer, unsigned long size)
346 {
347         int err;
348
349         if (obj->flags & SEEN)
350                 return 0;
351         obj->flags |= SEEN;
352
353         if (verbose)
354                 fprintf(stderr, "Checking %s %s\n",
355                         printable_type(obj), describe_object(obj));
356
357         if (fsck_walk(obj, NULL, &fsck_obj_options))
358                 objerror(obj, "broken links");
359         err = fsck_object(obj, buffer, size, &fsck_obj_options);
360         if (err)
361                 goto out;
362
363         if (obj->type == OBJ_COMMIT) {
364                 struct commit *commit = (struct commit *) obj;
365
366                 if (!commit->parents && show_root)
367                         printf("root %s\n", describe_object(&commit->object));
368         }
369
370         if (obj->type == OBJ_TAG) {
371                 struct tag *tag = (struct tag *) obj;
372
373                 if (show_tags && tag->tagged) {
374                         printf("tagged %s %s", printable_type(tag->tagged),
375                                 describe_object(tag->tagged));
376                         printf(" (%s) in %s\n", tag->tag,
377                                 describe_object(&tag->object));
378                 }
379         }
380
381 out:
382         if (obj->type == OBJ_TREE)
383                 free_tree_buffer((struct tree *)obj);
384         if (obj->type == OBJ_COMMIT)
385                 free_commit_buffer((struct commit *)obj);
386         return err;
387 }
388
389 static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
390                            unsigned long size, void *buffer, int *eaten)
391 {
392         /*
393          * Note, buffer may be NULL if type is OBJ_BLOB. See
394          * verify_packfile(), data_valid variable for details.
395          */
396         struct object *obj;
397         obj = parse_object_buffer(the_repository, oid, type, size, buffer,
398                                   eaten);
399         if (!obj) {
400                 errors_found |= ERROR_OBJECT;
401                 return error("%s: object corrupt or missing", oid_to_hex(oid));
402         }
403         obj->flags &= ~(REACHABLE | SEEN);
404         obj->flags |= HAS_OBJ;
405         return fsck_obj(obj, buffer, size);
406 }
407
408 static int default_refs;
409
410 static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
411         timestamp_t timestamp)
412 {
413         struct object *obj;
414
415         if (!is_null_oid(oid)) {
416                 obj = lookup_object(the_repository, oid->hash);
417                 if (obj && (obj->flags & HAS_OBJ)) {
418                         if (timestamp && name_objects)
419                                 add_decoration(fsck_walk_options.object_names,
420                                         obj,
421                                         xstrfmt("%s@{%"PRItime"}", refname, timestamp));
422                         obj->flags |= USED;
423                         mark_object_reachable(obj);
424                 } else if (!is_promisor_object(oid)) {
425                         error("%s: invalid reflog entry %s", refname, oid_to_hex(oid));
426                         errors_found |= ERROR_REACHABLE;
427                 }
428         }
429 }
430
431 static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid,
432                 const char *email, timestamp_t timestamp, int tz,
433                 const char *message, void *cb_data)
434 {
435         const char *refname = cb_data;
436
437         if (verbose)
438                 fprintf(stderr, "Checking reflog %s->%s\n",
439                         oid_to_hex(ooid), oid_to_hex(noid));
440
441         fsck_handle_reflog_oid(refname, ooid, 0);
442         fsck_handle_reflog_oid(refname, noid, timestamp);
443         return 0;
444 }
445
446 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
447                               int flag, void *cb_data)
448 {
449         for_each_reflog_ent(logname, fsck_handle_reflog_ent, (void *)logname);
450         return 0;
451 }
452
453 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
454                            int flag, void *cb_data)
455 {
456         struct object *obj;
457
458         obj = parse_object(the_repository, oid);
459         if (!obj) {
460                 if (is_promisor_object(oid)) {
461                         /*
462                          * Increment default_refs anyway, because this is a
463                          * valid ref.
464                          */
465                          default_refs++;
466                          return 0;
467                 }
468                 error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
469                 errors_found |= ERROR_REACHABLE;
470                 /* We'll continue with the rest despite the error.. */
471                 return 0;
472         }
473         if (obj->type != OBJ_COMMIT && is_branch(refname)) {
474                 error("%s: not a commit", refname);
475                 errors_found |= ERROR_REFS;
476         }
477         default_refs++;
478         obj->flags |= USED;
479         if (name_objects)
480                 add_decoration(fsck_walk_options.object_names,
481                         obj, xstrdup(refname));
482         mark_object_reachable(obj);
483
484         return 0;
485 }
486
487 static void get_default_heads(void)
488 {
489         if (head_points_at && !is_null_oid(&head_oid))
490                 fsck_handle_ref("HEAD", &head_oid, 0, NULL);
491         for_each_rawref(fsck_handle_ref, NULL);
492         if (include_reflogs)
493                 for_each_reflog(fsck_handle_reflog, NULL);
494
495         /*
496          * Not having any default heads isn't really fatal, but
497          * it does mean that "--unreachable" no longer makes any
498          * sense (since in this case everything will obviously
499          * be unreachable by definition.
500          *
501          * Showing dangling objects is valid, though (as those
502          * dangling objects are likely lost heads).
503          *
504          * So we just print a warning about it, and clear the
505          * "show_unreachable" flag.
506          */
507         if (!default_refs) {
508                 fprintf(stderr, "notice: No default references\n");
509                 show_unreachable = 0;
510         }
511 }
512
513 static int fsck_loose(const struct object_id *oid, const char *path, void *data)
514 {
515         struct object *obj;
516         enum object_type type;
517         unsigned long size;
518         void *contents;
519         int eaten;
520
521         if (read_loose_object(path, oid, &type, &size, &contents) < 0) {
522                 errors_found |= ERROR_OBJECT;
523                 error("%s: object corrupt or missing: %s",
524                       oid_to_hex(oid), path);
525                 return 0; /* keep checking other objects */
526         }
527
528         if (!contents && type != OBJ_BLOB)
529                 BUG("read_loose_object streamed a non-blob");
530
531         obj = parse_object_buffer(the_repository, oid, type, size,
532                                   contents, &eaten);
533
534         if (!obj) {
535                 errors_found |= ERROR_OBJECT;
536                 error("%s: object could not be parsed: %s",
537                       oid_to_hex(oid), path);
538                 if (!eaten)
539                         free(contents);
540                 return 0; /* keep checking other objects */
541         }
542
543         obj->flags &= ~(REACHABLE | SEEN);
544         obj->flags |= HAS_OBJ;
545         if (fsck_obj(obj, contents, size))
546                 errors_found |= ERROR_OBJECT;
547
548         if (!eaten)
549                 free(contents);
550         return 0; /* keep checking other objects, even if we saw an error */
551 }
552
553 static int fsck_cruft(const char *basename, const char *path, void *data)
554 {
555         if (!starts_with(basename, "tmp_obj_"))
556                 fprintf(stderr, "bad sha1 file: %s\n", path);
557         return 0;
558 }
559
560 static int fsck_subdir(unsigned int nr, const char *path, void *progress)
561 {
562         display_progress(progress, nr + 1);
563         return 0;
564 }
565
566 static void fsck_object_dir(const char *path)
567 {
568         struct progress *progress = NULL;
569
570         if (verbose)
571                 fprintf(stderr, "Checking object directory\n");
572
573         if (show_progress)
574                 progress = start_progress(_("Checking object directories"), 256);
575
576         for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
577                                       progress);
578         display_progress(progress, 256);
579         stop_progress(&progress);
580 }
581
582 static int fsck_head_link(void)
583 {
584         int null_is_error = 0;
585
586         if (verbose)
587                 fprintf(stderr, "Checking HEAD link\n");
588
589         head_points_at = resolve_ref_unsafe("HEAD", 0, &head_oid, NULL);
590         if (!head_points_at) {
591                 errors_found |= ERROR_REFS;
592                 return error("Invalid HEAD");
593         }
594         if (!strcmp(head_points_at, "HEAD"))
595                 /* detached HEAD */
596                 null_is_error = 1;
597         else if (!starts_with(head_points_at, "refs/heads/")) {
598                 errors_found |= ERROR_REFS;
599                 return error("HEAD points to something strange (%s)",
600                              head_points_at);
601         }
602         if (is_null_oid(&head_oid)) {
603                 if (null_is_error) {
604                         errors_found |= ERROR_REFS;
605                         return error("HEAD: detached HEAD points at nothing");
606                 }
607                 fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
608                         head_points_at + 11);
609         }
610         return 0;
611 }
612
613 static int fsck_cache_tree(struct cache_tree *it)
614 {
615         int i;
616         int err = 0;
617
618         if (verbose)
619                 fprintf(stderr, "Checking cache tree\n");
620
621         if (0 <= it->entry_count) {
622                 struct object *obj = parse_object(the_repository, &it->oid);
623                 if (!obj) {
624                         error("%s: invalid sha1 pointer in cache-tree",
625                               oid_to_hex(&it->oid));
626                         errors_found |= ERROR_REFS;
627                         return 1;
628                 }
629                 obj->flags |= USED;
630                 if (name_objects)
631                         add_decoration(fsck_walk_options.object_names,
632                                 obj, xstrdup(":"));
633                 mark_object_reachable(obj);
634                 if (obj->type != OBJ_TREE)
635                         err |= objerror(obj, "non-tree in cache-tree");
636         }
637         for (i = 0; i < it->subtree_nr; i++)
638                 err |= fsck_cache_tree(it->down[i]->cache_tree);
639         return err;
640 }
641
642 static void mark_object_for_connectivity(const struct object_id *oid)
643 {
644         struct object *obj = lookup_unknown_object(oid->hash);
645         obj->flags |= HAS_OBJ;
646 }
647
648 static int mark_loose_for_connectivity(const struct object_id *oid,
649                                        const char *path,
650                                        void *data)
651 {
652         mark_object_for_connectivity(oid);
653         return 0;
654 }
655
656 static int mark_packed_for_connectivity(const struct object_id *oid,
657                                         struct packed_git *pack,
658                                         uint32_t pos,
659                                         void *data)
660 {
661         mark_object_for_connectivity(oid);
662         return 0;
663 }
664
665 static char const * const fsck_usage[] = {
666         N_("git fsck [<options>] [<object>...]"),
667         NULL
668 };
669
670 static struct option fsck_opts[] = {
671         OPT__VERBOSE(&verbose, N_("be verbose")),
672         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
673         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
674         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
675         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
676         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
677         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
678         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
679         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
680         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
681         OPT_BOOL(0, "lost-found", &write_lost_and_found,
682                                 N_("write dangling objects in .git/lost-found")),
683         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
684         OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
685         OPT_END(),
686 };
687
688 int cmd_fsck(int argc, const char **argv, const char *prefix)
689 {
690         int i;
691         struct alternate_object_database *alt;
692
693         /* fsck knows how to handle missing promisor objects */
694         fetch_if_missing = 0;
695
696         errors_found = 0;
697         read_replace_refs = 0;
698
699         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
700
701         fsck_walk_options.walk = mark_object;
702         fsck_obj_options.walk = mark_used;
703         fsck_obj_options.error_func = fsck_error_func;
704         if (check_strict)
705                 fsck_obj_options.strict = 1;
706
707         if (show_progress == -1)
708                 show_progress = isatty(2);
709         if (verbose)
710                 show_progress = 0;
711
712         if (write_lost_and_found) {
713                 check_full = 1;
714                 include_reflogs = 0;
715         }
716
717         if (name_objects)
718                 fsck_walk_options.object_names =
719                         xcalloc(1, sizeof(struct decoration));
720
721         git_config(fsck_config, NULL);
722
723         fsck_head_link();
724         if (connectivity_only) {
725                 for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
726                 for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
727         } else {
728                 struct alternate_object_database *alt_odb_list;
729
730                 fsck_object_dir(get_object_directory());
731
732                 prepare_alt_odb(the_repository);
733                 alt_odb_list = the_repository->objects->alt_odb_list;
734                 for (alt = alt_odb_list; alt; alt = alt->next)
735                         fsck_object_dir(alt->path);
736
737                 if (check_full) {
738                         struct packed_git *p;
739                         uint32_t total = 0, count = 0;
740                         struct progress *progress = NULL;
741
742                         if (show_progress) {
743                                 for (p = get_all_packs(the_repository); p;
744                                      p = p->next) {
745                                         if (open_pack_index(p))
746                                                 continue;
747                                         total += p->num_objects;
748                                 }
749
750                                 progress = start_progress(_("Checking objects"), total);
751                         }
752                         for (p = get_all_packs(the_repository); p;
753                              p = p->next) {
754                                 /* verify gives error messages itself */
755                                 if (verify_pack(p, fsck_obj_buffer,
756                                                 progress, count))
757                                         errors_found |= ERROR_PACK;
758                                 count += p->num_objects;
759                         }
760                         stop_progress(&progress);
761                 }
762
763                 if (fsck_finish(&fsck_obj_options))
764                         errors_found |= ERROR_OBJECT;
765         }
766
767         for (i = 0; i < argc; i++) {
768                 const char *arg = argv[i];
769                 struct object_id oid;
770                 if (!get_oid(arg, &oid)) {
771                         struct object *obj = lookup_object(the_repository,
772                                                            oid.hash);
773
774                         if (!obj || !(obj->flags & HAS_OBJ)) {
775                                 if (is_promisor_object(&oid))
776                                         continue;
777                                 error("%s: object missing", oid_to_hex(&oid));
778                                 errors_found |= ERROR_OBJECT;
779                                 continue;
780                         }
781
782                         obj->flags |= USED;
783                         if (name_objects)
784                                 add_decoration(fsck_walk_options.object_names,
785                                         obj, xstrdup(arg));
786                         mark_object_reachable(obj);
787                         continue;
788                 }
789                 error("invalid parameter: expected sha1, got '%s'", arg);
790                 errors_found |= ERROR_OBJECT;
791         }
792
793         /*
794          * If we've not been given any explicit head information, do the
795          * default ones from .git/refs. We also consider the index file
796          * in this case (ie this implies --cache).
797          */
798         if (!argc) {
799                 get_default_heads();
800                 keep_cache_objects = 1;
801         }
802
803         if (keep_cache_objects) {
804                 verify_index_checksum = 1;
805                 verify_ce_order = 1;
806                 read_cache();
807                 for (i = 0; i < active_nr; i++) {
808                         unsigned int mode;
809                         struct blob *blob;
810                         struct object *obj;
811
812                         mode = active_cache[i]->ce_mode;
813                         if (S_ISGITLINK(mode))
814                                 continue;
815                         blob = lookup_blob(the_repository,
816                                            &active_cache[i]->oid);
817                         if (!blob)
818                                 continue;
819                         obj = &blob->object;
820                         obj->flags |= USED;
821                         if (name_objects)
822                                 add_decoration(fsck_walk_options.object_names,
823                                         obj,
824                                         xstrfmt(":%s", active_cache[i]->name));
825                         mark_object_reachable(obj);
826                 }
827                 if (active_cache_tree)
828                         fsck_cache_tree(active_cache_tree);
829         }
830
831         check_connectivity();
832
833         if (!git_config_get_bool("core.commitgraph", &i) && i) {
834                 struct child_process commit_graph_verify = CHILD_PROCESS_INIT;
835                 const char *verify_argv[] = { "commit-graph", "verify", NULL, NULL, NULL };
836
837                 commit_graph_verify.argv = verify_argv;
838                 commit_graph_verify.git_cmd = 1;
839                 if (run_command(&commit_graph_verify))
840                         errors_found |= ERROR_COMMIT_GRAPH;
841
842                 prepare_alt_odb(the_repository);
843                 for (alt =  the_repository->objects->alt_odb_list; alt; alt = alt->next) {
844                         verify_argv[2] = "--object-dir";
845                         verify_argv[3] = alt->path;
846                         if (run_command(&commit_graph_verify))
847                                 errors_found |= ERROR_COMMIT_GRAPH;
848                 }
849         }
850
851         return errors_found;
852 }