Git 2.22.3
[git] / builtin / fsck.c
1 #define USE_THE_INDEX_COMPATIBILITY_MACROS
2 #include "builtin.h"
3 #include "cache.h"
4 #include "repository.h"
5 #include "config.h"
6 #include "commit.h"
7 #include "tree.h"
8 #include "blob.h"
9 #include "tag.h"
10 #include "refs.h"
11 #include "pack.h"
12 #include "cache-tree.h"
13 #include "tree-walk.h"
14 #include "fsck.h"
15 #include "parse-options.h"
16 #include "dir.h"
17 #include "progress.h"
18 #include "streaming.h"
19 #include "decorate.h"
20 #include "packfile.h"
21 #include "object-store.h"
22 #include "run-command.h"
23 #include "worktree.h"
24
25 #define REACHABLE 0x0001
26 #define SEEN      0x0002
27 #define HAS_OBJ   0x0004
28 /* This flag is set if something points to this object. */
29 #define USED      0x0008
30
31 static int show_root;
32 static int show_tags;
33 static int show_unreachable;
34 static int include_reflogs = 1;
35 static int check_full = 1;
36 static int connectivity_only;
37 static int check_strict;
38 static int keep_cache_objects;
39 static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
40 static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
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 bufs[] = {
56                 STRBUF_INIT, STRBUF_INIT, STRBUF_INIT, STRBUF_INIT
57         };
58         static int b = 0;
59         struct strbuf *buf;
60         char *name = NULL;
61
62         if (name_objects)
63                 name = lookup_decoration(fsck_walk_options.object_names, obj);
64
65         buf = bufs + b;
66         b = (b + 1) % ARRAY_SIZE(bufs);
67         strbuf_reset(buf);
68         strbuf_addstr(buf, oid_to_hex(&obj->oid));
69         if (name)
70                 strbuf_addf(buf, " (%s)", name);
71
72         return buf->buf;
73 }
74
75 static const char *printable_type(struct object *obj)
76 {
77         const char *ret;
78
79         if (obj->type == OBJ_NONE) {
80                 enum object_type type = oid_object_info(the_repository,
81                                                         &obj->oid, NULL);
82                 if (type > 0)
83                         object_as_type(the_repository, obj, type, 0);
84         }
85
86         ret = type_name(obj->type);
87         if (!ret)
88                 ret = _("unknown");
89
90         return ret;
91 }
92
93 static int fsck_config(const char *var, const char *value, void *cb)
94 {
95         if (strcmp(var, "fsck.skiplist") == 0) {
96                 const char *path;
97                 struct strbuf sb = STRBUF_INIT;
98
99                 if (git_config_pathname(&path, var, value))
100                         return 1;
101                 strbuf_addf(&sb, "skiplist=%s", path);
102                 free((char *)path);
103                 fsck_set_msg_types(&fsck_obj_options, sb.buf);
104                 strbuf_release(&sb);
105                 return 0;
106         }
107
108         if (skip_prefix(var, "fsck.", &var)) {
109                 fsck_set_msg_type(&fsck_obj_options, var, value);
110                 return 0;
111         }
112
113         return git_default_config(var, value, cb);
114 }
115
116 static int objerror(struct object *obj, const char *err)
117 {
118         errors_found |= ERROR_OBJECT;
119         /* TRANSLATORS: e.g. error in tree 01bfda: <more explanation> */
120         fprintf_ln(stderr, _("error in %s %s: %s"),
121                    printable_type(obj), describe_object(obj), err);
122         return -1;
123 }
124
125 static int fsck_error_func(struct fsck_options *o,
126         struct object *obj, int type, const char *message)
127 {
128         switch (type) {
129         case FSCK_WARN:
130                 /* TRANSLATORS: e.g. warning in tree 01bfda: <more explanation> */
131                 fprintf_ln(stderr, _("warning in %s %s: %s"),
132                            printable_type(obj), describe_object(obj), message);
133                 return 0;
134         case FSCK_ERROR:
135                 /* TRANSLATORS: e.g. error in tree 01bfda: <more explanation> */
136                 fprintf_ln(stderr, _("error in %s %s: %s"),
137                            printable_type(obj), describe_object(obj), message);
138                 return 1;
139         default:
140                 BUG("%d (FSCK_IGNORE?) should never trigger this callback", type);
141         }
142 }
143
144 static struct object_array pending;
145
146 static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
147 {
148         struct object *parent = data;
149
150         /*
151          * The only case data is NULL or type is OBJ_ANY is when
152          * mark_object_reachable() calls us.  All the callers of
153          * that function has non-NULL obj hence ...
154          */
155         if (!obj) {
156                 /* ... these references to parent->fld are safe here */
157                 printf_ln(_("broken link from %7s %s"),
158                           printable_type(parent), describe_object(parent));
159                 printf_ln(_("broken link from %7s %s"),
160                           (type == OBJ_ANY ? _("unknown") : type_name(type)),
161                           _("unknown"));
162                 errors_found |= ERROR_REACHABLE;
163                 return 1;
164         }
165
166         if (type != OBJ_ANY && obj->type != type)
167                 /* ... and the reference to parent is safe here */
168                 objerror(parent, _("wrong object type in link"));
169
170         if (obj->flags & REACHABLE)
171                 return 0;
172         obj->flags |= REACHABLE;
173
174         if (is_promisor_object(&obj->oid))
175                 /*
176                  * Further recursion does not need to be performed on this
177                  * object since it is a promisor object (so it does not need to
178                  * be added to "pending").
179                  */
180                 return 0;
181
182         if (!(obj->flags & HAS_OBJ)) {
183                 if (parent && !has_object_file(&obj->oid)) {
184                         printf_ln(_("broken link from %7s %s\n"
185                                     "              to %7s %s"),
186                                   printable_type(parent),
187                                   describe_object(parent),
188                                   printable_type(obj),
189                                   describe_object(obj));
190                         errors_found |= ERROR_REACHABLE;
191                 }
192                 return 1;
193         }
194
195         add_object_array(obj, NULL, &pending);
196         return 0;
197 }
198
199 static void mark_object_reachable(struct object *obj)
200 {
201         mark_object(obj, OBJ_ANY, NULL, NULL);
202 }
203
204 static int traverse_one_object(struct object *obj)
205 {
206         int result = fsck_walk(obj, obj, &fsck_walk_options);
207
208         if (obj->type == OBJ_TREE) {
209                 struct tree *tree = (struct tree *)obj;
210                 free_tree_buffer(tree);
211         }
212         return result;
213 }
214
215 static int traverse_reachable(void)
216 {
217         struct progress *progress = NULL;
218         unsigned int nr = 0;
219         int result = 0;
220         if (show_progress)
221                 progress = start_delayed_progress(_("Checking connectivity"), 0);
222         while (pending.nr) {
223                 result |= traverse_one_object(object_array_pop(&pending));
224                 display_progress(progress, ++nr);
225         }
226         stop_progress(&progress);
227         return !!result;
228 }
229
230 static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
231 {
232         if (!obj)
233                 return 1;
234         obj->flags |= USED;
235         return 0;
236 }
237
238 static void mark_unreachable_referents(const struct object_id *oid)
239 {
240         struct fsck_options options = FSCK_OPTIONS_DEFAULT;
241         struct object *obj = lookup_object(the_repository, oid->hash);
242
243         if (!obj || !(obj->flags & HAS_OBJ))
244                 return; /* not part of our original set */
245         if (obj->flags & REACHABLE)
246                 return; /* reachable objects already traversed */
247
248         /*
249          * Avoid passing OBJ_NONE to fsck_walk, which will parse the object
250          * (and we want to avoid parsing blobs).
251          */
252         if (obj->type == OBJ_NONE) {
253                 enum object_type type = oid_object_info(the_repository,
254                                                         &obj->oid, NULL);
255                 if (type > 0)
256                         object_as_type(the_repository, obj, type, 0);
257         }
258
259         options.walk = mark_used;
260         fsck_walk(obj, NULL, &options);
261 }
262
263 static int mark_loose_unreachable_referents(const struct object_id *oid,
264                                             const char *path,
265                                             void *data)
266 {
267         mark_unreachable_referents(oid);
268         return 0;
269 }
270
271 static int mark_packed_unreachable_referents(const struct object_id *oid,
272                                              struct packed_git *pack,
273                                              uint32_t pos,
274                                              void *data)
275 {
276         mark_unreachable_referents(oid);
277         return 0;
278 }
279
280 /*
281  * Check a single reachable object
282  */
283 static void check_reachable_object(struct object *obj)
284 {
285         /*
286          * We obviously want the object to be parsed,
287          * except if it was in a pack-file and we didn't
288          * do a full fsck
289          */
290         if (!(obj->flags & HAS_OBJ)) {
291                 if (is_promisor_object(&obj->oid))
292                         return;
293                 if (has_object_pack(&obj->oid))
294                         return; /* it is in pack - forget about it */
295                 printf_ln(_("missing %s %s"), printable_type(obj),
296                           describe_object(obj));
297                 errors_found |= ERROR_REACHABLE;
298                 return;
299         }
300 }
301
302 /*
303  * Check a single unreachable object
304  */
305 static void check_unreachable_object(struct object *obj)
306 {
307         /*
308          * Missing unreachable object? Ignore it. It's not like
309          * we miss it (since it can't be reached), nor do we want
310          * to complain about it being unreachable (since it does
311          * not exist).
312          */
313         if (!(obj->flags & HAS_OBJ))
314                 return;
315
316         /*
317          * Unreachable object that exists? Show it if asked to,
318          * since this is something that is prunable.
319          */
320         if (show_unreachable) {
321                 printf_ln(_("unreachable %s %s"), printable_type(obj),
322                           describe_object(obj));
323                 return;
324         }
325
326         /*
327          * "!USED" means that nothing at all points to it, including
328          * other unreachable objects. In other words, it's the "tip"
329          * of some set of unreachable objects, usually a commit that
330          * got dropped.
331          *
332          * Such starting points are more interesting than some random
333          * set of unreachable objects, so we show them even if the user
334          * hasn't asked for _all_ unreachable objects. If you have
335          * deleted a branch by mistake, this is a prime candidate to
336          * start looking at, for example.
337          */
338         if (!(obj->flags & USED)) {
339                 if (show_dangling)
340                         printf_ln(_("dangling %s %s"), printable_type(obj),
341                                   describe_object(obj));
342                 if (write_lost_and_found) {
343                         char *filename = git_pathdup("lost-found/%s/%s",
344                                 obj->type == OBJ_COMMIT ? "commit" : "other",
345                                 describe_object(obj));
346                         FILE *f;
347
348                         if (safe_create_leading_directories_const(filename)) {
349                                 error(_("could not create lost-found"));
350                                 free(filename);
351                                 return;
352                         }
353                         f = xfopen(filename, "w");
354                         if (obj->type == OBJ_BLOB) {
355                                 if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
356                                         die_errno(_("could not write '%s'"), filename);
357                         } else
358                                 fprintf(f, "%s\n", describe_object(obj));
359                         if (fclose(f))
360                                 die_errno(_("could not finish '%s'"),
361                                           filename);
362                         free(filename);
363                 }
364                 return;
365         }
366
367         /*
368          * Otherwise? It's there, it's unreachable, and some other unreachable
369          * object points to it. Ignore it - it's not interesting, and we showed
370          * all the interesting cases above.
371          */
372 }
373
374 static void check_object(struct object *obj)
375 {
376         if (verbose)
377                 fprintf_ln(stderr, _("Checking %s"), describe_object(obj));
378
379         if (obj->flags & REACHABLE)
380                 check_reachable_object(obj);
381         else
382                 check_unreachable_object(obj);
383 }
384
385 static void check_connectivity(void)
386 {
387         int i, max;
388
389         /* Traverse the pending reachable objects */
390         traverse_reachable();
391
392         /*
393          * With --connectivity-only, we won't have actually opened and marked
394          * unreachable objects with USED. Do that now to make --dangling, etc
395          * accurate.
396          */
397         if (connectivity_only && (show_dangling || write_lost_and_found)) {
398                 /*
399                  * Even though we already have a "struct object" for each of
400                  * these in memory, we must not iterate over the internal
401                  * object hash as we do below. Our loop would potentially
402                  * resize the hash, making our iteration invalid.
403                  *
404                  * Instead, we'll just go back to the source list of objects,
405                  * and ignore any that weren't present in our earlier
406                  * traversal.
407                  */
408                 for_each_loose_object(mark_loose_unreachable_referents, NULL, 0);
409                 for_each_packed_object(mark_packed_unreachable_referents, NULL, 0);
410         }
411
412         /* Look up all the requirements, warn about missing objects.. */
413         max = get_max_object_index();
414         if (verbose)
415                 fprintf_ln(stderr, _("Checking connectivity (%d objects)"), max);
416
417         for (i = 0; i < max; i++) {
418                 struct object *obj = get_indexed_object(i);
419
420                 if (obj)
421                         check_object(obj);
422         }
423 }
424
425 static int fsck_obj(struct object *obj, void *buffer, unsigned long size)
426 {
427         int err;
428
429         if (obj->flags & SEEN)
430                 return 0;
431         obj->flags |= SEEN;
432
433         if (verbose)
434                 fprintf_ln(stderr, _("Checking %s %s"),
435                            printable_type(obj), describe_object(obj));
436
437         if (fsck_walk(obj, NULL, &fsck_obj_options))
438                 objerror(obj, _("broken links"));
439         err = fsck_object(obj, buffer, size, &fsck_obj_options);
440         if (err)
441                 goto out;
442
443         if (obj->type == OBJ_COMMIT) {
444                 struct commit *commit = (struct commit *) obj;
445
446                 if (!commit->parents && show_root)
447                         printf_ln(_("root %s"),
448                                   describe_object(&commit->object));
449         }
450
451         if (obj->type == OBJ_TAG) {
452                 struct tag *tag = (struct tag *) obj;
453
454                 if (show_tags && tag->tagged) {
455                         printf_ln(_("tagged %s %s (%s) in %s"),
456                                   printable_type(tag->tagged),
457                                   describe_object(tag->tagged),
458                                   tag->tag,
459                                   describe_object(&tag->object));
460                 }
461         }
462
463 out:
464         if (obj->type == OBJ_TREE)
465                 free_tree_buffer((struct tree *)obj);
466         if (obj->type == OBJ_COMMIT)
467                 free_commit_buffer(the_repository->parsed_objects,
468                                    (struct commit *)obj);
469         return err;
470 }
471
472 static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
473                            unsigned long size, void *buffer, int *eaten)
474 {
475         /*
476          * Note, buffer may be NULL if type is OBJ_BLOB. See
477          * verify_packfile(), data_valid variable for details.
478          */
479         struct object *obj;
480         obj = parse_object_buffer(the_repository, oid, type, size, buffer,
481                                   eaten);
482         if (!obj) {
483                 errors_found |= ERROR_OBJECT;
484                 return error(_("%s: object corrupt or missing"),
485                              oid_to_hex(oid));
486         }
487         obj->flags &= ~(REACHABLE | SEEN);
488         obj->flags |= HAS_OBJ;
489         return fsck_obj(obj, buffer, size);
490 }
491
492 static int default_refs;
493
494 static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
495         timestamp_t timestamp)
496 {
497         struct object *obj;
498
499         if (!is_null_oid(oid)) {
500                 obj = lookup_object(the_repository, oid->hash);
501                 if (obj && (obj->flags & HAS_OBJ)) {
502                         if (timestamp && name_objects)
503                                 add_decoration(fsck_walk_options.object_names,
504                                         obj,
505                                         xstrfmt("%s@{%"PRItime"}", refname, timestamp));
506                         obj->flags |= USED;
507                         mark_object_reachable(obj);
508                 } else if (!is_promisor_object(oid)) {
509                         error(_("%s: invalid reflog entry %s"),
510                               refname, oid_to_hex(oid));
511                         errors_found |= ERROR_REACHABLE;
512                 }
513         }
514 }
515
516 static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid,
517                 const char *email, timestamp_t timestamp, int tz,
518                 const char *message, void *cb_data)
519 {
520         const char *refname = cb_data;
521
522         if (verbose)
523                 fprintf_ln(stderr, _("Checking reflog %s->%s"),
524                            oid_to_hex(ooid), oid_to_hex(noid));
525
526         fsck_handle_reflog_oid(refname, ooid, 0);
527         fsck_handle_reflog_oid(refname, noid, timestamp);
528         return 0;
529 }
530
531 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
532                               int flag, void *cb_data)
533 {
534         struct strbuf refname = STRBUF_INIT;
535
536         strbuf_worktree_ref(cb_data, &refname, logname);
537         for_each_reflog_ent(refname.buf, fsck_handle_reflog_ent, refname.buf);
538         strbuf_release(&refname);
539         return 0;
540 }
541
542 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
543                            int flag, void *cb_data)
544 {
545         struct object *obj;
546
547         obj = parse_object(the_repository, oid);
548         if (!obj) {
549                 if (is_promisor_object(oid)) {
550                         /*
551                          * Increment default_refs anyway, because this is a
552                          * valid ref.
553                          */
554                          default_refs++;
555                          return 0;
556                 }
557                 error(_("%s: invalid sha1 pointer %s"),
558                       refname, oid_to_hex(oid));
559                 errors_found |= ERROR_REACHABLE;
560                 /* We'll continue with the rest despite the error.. */
561                 return 0;
562         }
563         if (obj->type != OBJ_COMMIT && is_branch(refname)) {
564                 error(_("%s: not a commit"), refname);
565                 errors_found |= ERROR_REFS;
566         }
567         default_refs++;
568         obj->flags |= USED;
569         if (name_objects)
570                 add_decoration(fsck_walk_options.object_names,
571                         obj, xstrdup(refname));
572         mark_object_reachable(obj);
573
574         return 0;
575 }
576
577 static int fsck_head_link(const char *head_ref_name,
578                           const char **head_points_at,
579                           struct object_id *head_oid);
580
581 static void get_default_heads(void)
582 {
583         struct worktree **worktrees, **p;
584         const char *head_points_at;
585         struct object_id head_oid;
586
587         for_each_rawref(fsck_handle_ref, NULL);
588
589         worktrees = get_worktrees(0);
590         for (p = worktrees; *p; p++) {
591                 struct worktree *wt = *p;
592                 struct strbuf ref = STRBUF_INIT;
593
594                 strbuf_worktree_ref(wt, &ref, "HEAD");
595                 fsck_head_link(ref.buf, &head_points_at, &head_oid);
596                 if (head_points_at && !is_null_oid(&head_oid))
597                         fsck_handle_ref(ref.buf, &head_oid, 0, NULL);
598                 strbuf_release(&ref);
599
600                 if (include_reflogs)
601                         refs_for_each_reflog(get_worktree_ref_store(wt),
602                                              fsck_handle_reflog, wt);
603         }
604         free_worktrees(worktrees);
605
606         /*
607          * Not having any default heads isn't really fatal, but
608          * it does mean that "--unreachable" no longer makes any
609          * sense (since in this case everything will obviously
610          * be unreachable by definition.
611          *
612          * Showing dangling objects is valid, though (as those
613          * dangling objects are likely lost heads).
614          *
615          * So we just print a warning about it, and clear the
616          * "show_unreachable" flag.
617          */
618         if (!default_refs) {
619                 fprintf_ln(stderr, _("notice: No default references"));
620                 show_unreachable = 0;
621         }
622 }
623
624 static int fsck_loose(const struct object_id *oid, const char *path, void *data)
625 {
626         struct object *obj;
627         enum object_type type;
628         unsigned long size;
629         void *contents;
630         int eaten;
631
632         if (read_loose_object(path, oid, &type, &size, &contents) < 0) {
633                 errors_found |= ERROR_OBJECT;
634                 error(_("%s: object corrupt or missing: %s"),
635                       oid_to_hex(oid), path);
636                 return 0; /* keep checking other objects */
637         }
638
639         if (!contents && type != OBJ_BLOB)
640                 BUG("read_loose_object streamed a non-blob");
641
642         obj = parse_object_buffer(the_repository, oid, type, size,
643                                   contents, &eaten);
644
645         if (!obj) {
646                 errors_found |= ERROR_OBJECT;
647                 error(_("%s: object could not be parsed: %s"),
648                       oid_to_hex(oid), path);
649                 if (!eaten)
650                         free(contents);
651                 return 0; /* keep checking other objects */
652         }
653
654         obj->flags &= ~(REACHABLE | SEEN);
655         obj->flags |= HAS_OBJ;
656         if (fsck_obj(obj, contents, size))
657                 errors_found |= ERROR_OBJECT;
658
659         if (!eaten)
660                 free(contents);
661         return 0; /* keep checking other objects, even if we saw an error */
662 }
663
664 static int fsck_cruft(const char *basename, const char *path, void *data)
665 {
666         if (!starts_with(basename, "tmp_obj_"))
667                 fprintf_ln(stderr, _("bad sha1 file: %s"), path);
668         return 0;
669 }
670
671 static int fsck_subdir(unsigned int nr, const char *path, void *progress)
672 {
673         display_progress(progress, nr + 1);
674         return 0;
675 }
676
677 static void fsck_object_dir(const char *path)
678 {
679         struct progress *progress = NULL;
680
681         if (verbose)
682                 fprintf_ln(stderr, _("Checking object directory"));
683
684         if (show_progress)
685                 progress = start_progress(_("Checking object directories"), 256);
686
687         for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
688                                       progress);
689         display_progress(progress, 256);
690         stop_progress(&progress);
691 }
692
693 static int fsck_head_link(const char *head_ref_name,
694                           const char **head_points_at,
695                           struct object_id *head_oid)
696 {
697         int null_is_error = 0;
698
699         if (verbose)
700                 fprintf_ln(stderr, _("Checking %s link"), head_ref_name);
701
702         *head_points_at = resolve_ref_unsafe(head_ref_name, 0, head_oid, NULL);
703         if (!*head_points_at) {
704                 errors_found |= ERROR_REFS;
705                 return error(_("invalid %s"), head_ref_name);
706         }
707         if (!strcmp(*head_points_at, head_ref_name))
708                 /* detached HEAD */
709                 null_is_error = 1;
710         else if (!starts_with(*head_points_at, "refs/heads/")) {
711                 errors_found |= ERROR_REFS;
712                 return error(_("%s points to something strange (%s)"),
713                              head_ref_name, *head_points_at);
714         }
715         if (is_null_oid(head_oid)) {
716                 if (null_is_error) {
717                         errors_found |= ERROR_REFS;
718                         return error(_("%s: detached HEAD points at nothing"),
719                                      head_ref_name);
720                 }
721                 fprintf_ln(stderr,
722                            _("notice: %s points to an unborn branch (%s)"),
723                            head_ref_name, *head_points_at + 11);
724         }
725         return 0;
726 }
727
728 static int fsck_cache_tree(struct cache_tree *it)
729 {
730         int i;
731         int err = 0;
732
733         if (verbose)
734                 fprintf_ln(stderr, _("Checking cache tree"));
735
736         if (0 <= it->entry_count) {
737                 struct object *obj = parse_object(the_repository, &it->oid);
738                 if (!obj) {
739                         error(_("%s: invalid sha1 pointer in cache-tree"),
740                               oid_to_hex(&it->oid));
741                         errors_found |= ERROR_REFS;
742                         return 1;
743                 }
744                 obj->flags |= USED;
745                 if (name_objects)
746                         add_decoration(fsck_walk_options.object_names,
747                                 obj, xstrdup(":"));
748                 mark_object_reachable(obj);
749                 if (obj->type != OBJ_TREE)
750                         err |= objerror(obj, _("non-tree in cache-tree"));
751         }
752         for (i = 0; i < it->subtree_nr; i++)
753                 err |= fsck_cache_tree(it->down[i]->cache_tree);
754         return err;
755 }
756
757 static void mark_object_for_connectivity(const struct object_id *oid)
758 {
759         struct object *obj = lookup_unknown_object(oid->hash);
760         obj->flags |= HAS_OBJ;
761 }
762
763 static int mark_loose_for_connectivity(const struct object_id *oid,
764                                        const char *path,
765                                        void *data)
766 {
767         mark_object_for_connectivity(oid);
768         return 0;
769 }
770
771 static int mark_packed_for_connectivity(const struct object_id *oid,
772                                         struct packed_git *pack,
773                                         uint32_t pos,
774                                         void *data)
775 {
776         mark_object_for_connectivity(oid);
777         return 0;
778 }
779
780 static char const * const fsck_usage[] = {
781         N_("git fsck [<options>] [<object>...]"),
782         NULL
783 };
784
785 static struct option fsck_opts[] = {
786         OPT__VERBOSE(&verbose, N_("be verbose")),
787         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
788         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
789         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
790         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
791         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
792         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
793         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
794         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
795         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
796         OPT_BOOL(0, "lost-found", &write_lost_and_found,
797                                 N_("write dangling objects in .git/lost-found")),
798         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
799         OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
800         OPT_END(),
801 };
802
803 int cmd_fsck(int argc, const char **argv, const char *prefix)
804 {
805         int i;
806         struct object_directory *odb;
807
808         /* fsck knows how to handle missing promisor objects */
809         fetch_if_missing = 0;
810
811         errors_found = 0;
812         read_replace_refs = 0;
813
814         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
815
816         fsck_walk_options.walk = mark_object;
817         fsck_obj_options.walk = mark_used;
818         fsck_obj_options.error_func = fsck_error_func;
819         if (check_strict)
820                 fsck_obj_options.strict = 1;
821
822         if (show_progress == -1)
823                 show_progress = isatty(2);
824         if (verbose)
825                 show_progress = 0;
826
827         if (write_lost_and_found) {
828                 check_full = 1;
829                 include_reflogs = 0;
830         }
831
832         if (name_objects)
833                 fsck_walk_options.object_names =
834                         xcalloc(1, sizeof(struct decoration));
835
836         git_config(fsck_config, NULL);
837
838         if (connectivity_only) {
839                 for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
840                 for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
841         } else {
842                 prepare_alt_odb(the_repository);
843                 for (odb = the_repository->objects->odb; odb; odb = odb->next)
844                         fsck_object_dir(odb->path);
845
846                 if (check_full) {
847                         struct packed_git *p;
848                         uint32_t total = 0, count = 0;
849                         struct progress *progress = NULL;
850
851                         if (show_progress) {
852                                 for (p = get_all_packs(the_repository); p;
853                                      p = p->next) {
854                                         if (open_pack_index(p))
855                                                 continue;
856                                         total += p->num_objects;
857                                 }
858
859                                 progress = start_progress(_("Checking objects"), total);
860                         }
861                         for (p = get_all_packs(the_repository); p;
862                              p = p->next) {
863                                 /* verify gives error messages itself */
864                                 if (verify_pack(the_repository,
865                                                 p, fsck_obj_buffer,
866                                                 progress, count))
867                                         errors_found |= ERROR_PACK;
868                                 count += p->num_objects;
869                         }
870                         stop_progress(&progress);
871                 }
872
873                 if (fsck_finish(&fsck_obj_options))
874                         errors_found |= ERROR_OBJECT;
875         }
876
877         for (i = 0; i < argc; i++) {
878                 const char *arg = argv[i];
879                 struct object_id oid;
880                 if (!get_oid(arg, &oid)) {
881                         struct object *obj = lookup_object(the_repository,
882                                                            oid.hash);
883
884                         if (!obj || !(obj->flags & HAS_OBJ)) {
885                                 if (is_promisor_object(&oid))
886                                         continue;
887                                 error(_("%s: object missing"), oid_to_hex(&oid));
888                                 errors_found |= ERROR_OBJECT;
889                                 continue;
890                         }
891
892                         obj->flags |= USED;
893                         if (name_objects)
894                                 add_decoration(fsck_walk_options.object_names,
895                                         obj, xstrdup(arg));
896                         mark_object_reachable(obj);
897                         continue;
898                 }
899                 error(_("invalid parameter: expected sha1, got '%s'"), arg);
900                 errors_found |= ERROR_OBJECT;
901         }
902
903         /*
904          * If we've not been given any explicit head information, do the
905          * default ones from .git/refs. We also consider the index file
906          * in this case (ie this implies --cache).
907          */
908         if (!argc) {
909                 get_default_heads();
910                 keep_cache_objects = 1;
911         }
912
913         if (keep_cache_objects) {
914                 verify_index_checksum = 1;
915                 verify_ce_order = 1;
916                 read_cache();
917                 for (i = 0; i < active_nr; i++) {
918                         unsigned int mode;
919                         struct blob *blob;
920                         struct object *obj;
921
922                         mode = active_cache[i]->ce_mode;
923                         if (S_ISGITLINK(mode))
924                                 continue;
925                         blob = lookup_blob(the_repository,
926                                            &active_cache[i]->oid);
927                         if (!blob)
928                                 continue;
929                         obj = &blob->object;
930                         obj->flags |= USED;
931                         if (name_objects)
932                                 add_decoration(fsck_walk_options.object_names,
933                                         obj,
934                                         xstrfmt(":%s", active_cache[i]->name));
935                         mark_object_reachable(obj);
936                 }
937                 if (active_cache_tree)
938                         fsck_cache_tree(active_cache_tree);
939         }
940
941         check_connectivity();
942
943         if (!git_config_get_bool("core.commitgraph", &i) && i) {
944                 struct child_process commit_graph_verify = CHILD_PROCESS_INIT;
945                 const char *verify_argv[] = { "commit-graph", "verify", NULL, NULL, NULL };
946
947                 prepare_alt_odb(the_repository);
948                 for (odb = the_repository->objects->odb; odb; odb = odb->next) {
949                         child_process_init(&commit_graph_verify);
950                         commit_graph_verify.argv = verify_argv;
951                         commit_graph_verify.git_cmd = 1;
952                         verify_argv[2] = "--object-dir";
953                         verify_argv[3] = odb->path;
954                         if (run_command(&commit_graph_verify))
955                                 errors_found |= ERROR_COMMIT_GRAPH;
956                 }
957         }
958
959         if (!git_config_get_bool("core.multipackindex", &i) && i) {
960                 struct child_process midx_verify = CHILD_PROCESS_INIT;
961                 const char *midx_argv[] = { "multi-pack-index", "verify", NULL, NULL, NULL };
962
963                 prepare_alt_odb(the_repository);
964                 for (odb = the_repository->objects->odb; odb; odb = odb->next) {
965                         child_process_init(&midx_verify);
966                         midx_verify.argv = midx_argv;
967                         midx_verify.git_cmd = 1;
968                         midx_argv[2] = "--object-dir";
969                         midx_argv[3] = odb->path;
970                         if (run_command(&midx_verify))
971                                 errors_found |= ERROR_COMMIT_GRAPH;
972                 }
973         }
974
975         return errors_found;
976 }