Merge branch 'en/simplify-check-updates-in-unpack-trees' into maint
[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(const struct object_id *oid)
54 {
55         return fsck_describe_object(&fsck_walk_options, oid);
56 }
57
58 static const char *printable_type(const struct object_id *oid,
59                                   enum object_type type)
60 {
61         const char *ret;
62
63         if (type == OBJ_NONE)
64                 type = oid_object_info(the_repository, oid, NULL);
65
66         ret = type_name(type);
67         if (!ret)
68                 ret = _("unknown");
69
70         return ret;
71 }
72
73 static int fsck_config(const char *var, const char *value, void *cb)
74 {
75         if (strcmp(var, "fsck.skiplist") == 0) {
76                 const char *path;
77                 struct strbuf sb = STRBUF_INIT;
78
79                 if (git_config_pathname(&path, var, value))
80                         return 1;
81                 strbuf_addf(&sb, "skiplist=%s", path);
82                 free((char *)path);
83                 fsck_set_msg_types(&fsck_obj_options, sb.buf);
84                 strbuf_release(&sb);
85                 return 0;
86         }
87
88         if (skip_prefix(var, "fsck.", &var)) {
89                 fsck_set_msg_type(&fsck_obj_options, var, value);
90                 return 0;
91         }
92
93         return git_default_config(var, value, cb);
94 }
95
96 static int objerror(struct object *obj, const char *err)
97 {
98         errors_found |= ERROR_OBJECT;
99         /* TRANSLATORS: e.g. error in tree 01bfda: <more explanation> */
100         fprintf_ln(stderr, _("error in %s %s: %s"),
101                    printable_type(&obj->oid, obj->type),
102                    describe_object(&obj->oid), err);
103         return -1;
104 }
105
106 static int fsck_error_func(struct fsck_options *o,
107                            const struct object_id *oid,
108                            enum object_type object_type,
109                            int msg_type, const char *message)
110 {
111         switch (msg_type) {
112         case FSCK_WARN:
113                 /* TRANSLATORS: e.g. warning in tree 01bfda: <more explanation> */
114                 fprintf_ln(stderr, _("warning in %s %s: %s"),
115                            printable_type(oid, object_type),
116                            describe_object(oid), message);
117                 return 0;
118         case FSCK_ERROR:
119                 /* TRANSLATORS: e.g. error in tree 01bfda: <more explanation> */
120                 fprintf_ln(stderr, _("error in %s %s: %s"),
121                            printable_type(oid, object_type),
122                            describe_object(oid), message);
123                 return 1;
124         default:
125                 BUG("%d (FSCK_IGNORE?) should never trigger this callback",
126                     msg_type);
127         }
128 }
129
130 static struct object_array pending;
131
132 static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
133 {
134         struct object *parent = data;
135
136         /*
137          * The only case data is NULL or type is OBJ_ANY is when
138          * mark_object_reachable() calls us.  All the callers of
139          * that function has non-NULL obj hence ...
140          */
141         if (!obj) {
142                 /* ... these references to parent->fld are safe here */
143                 printf_ln(_("broken link from %7s %s"),
144                           printable_type(&parent->oid, parent->type),
145                           describe_object(&parent->oid));
146                 printf_ln(_("broken link from %7s %s"),
147                           (type == OBJ_ANY ? _("unknown") : type_name(type)),
148                           _("unknown"));
149                 errors_found |= ERROR_REACHABLE;
150                 return 1;
151         }
152
153         if (type != OBJ_ANY && obj->type != type)
154                 /* ... and the reference to parent is safe here */
155                 objerror(parent, _("wrong object type in link"));
156
157         if (obj->flags & REACHABLE)
158                 return 0;
159         obj->flags |= REACHABLE;
160
161         if (is_promisor_object(&obj->oid))
162                 /*
163                  * Further recursion does not need to be performed on this
164                  * object since it is a promisor object (so it does not need to
165                  * be added to "pending").
166                  */
167                 return 0;
168
169         if (!(obj->flags & HAS_OBJ)) {
170                 if (parent && !has_object_file(&obj->oid)) {
171                         printf_ln(_("broken link from %7s %s\n"
172                                     "              to %7s %s"),
173                                   printable_type(&parent->oid, parent->type),
174                                   describe_object(&parent->oid),
175                                   printable_type(&obj->oid, obj->type),
176                                   describe_object(&obj->oid));
177                         errors_found |= ERROR_REACHABLE;
178                 }
179                 return 1;
180         }
181
182         add_object_array(obj, NULL, &pending);
183         return 0;
184 }
185
186 static void mark_object_reachable(struct object *obj)
187 {
188         mark_object(obj, OBJ_ANY, NULL, NULL);
189 }
190
191 static int traverse_one_object(struct object *obj)
192 {
193         int result = fsck_walk(obj, obj, &fsck_walk_options);
194
195         if (obj->type == OBJ_TREE) {
196                 struct tree *tree = (struct tree *)obj;
197                 free_tree_buffer(tree);
198         }
199         return result;
200 }
201
202 static int traverse_reachable(void)
203 {
204         struct progress *progress = NULL;
205         unsigned int nr = 0;
206         int result = 0;
207         if (show_progress)
208                 progress = start_delayed_progress(_("Checking connectivity"), 0);
209         while (pending.nr) {
210                 result |= traverse_one_object(object_array_pop(&pending));
211                 display_progress(progress, ++nr);
212         }
213         stop_progress(&progress);
214         return !!result;
215 }
216
217 static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
218 {
219         if (!obj)
220                 return 1;
221         obj->flags |= USED;
222         return 0;
223 }
224
225 static void mark_unreachable_referents(const struct object_id *oid)
226 {
227         struct fsck_options options = FSCK_OPTIONS_DEFAULT;
228         struct object *obj = lookup_object(the_repository, oid);
229
230         if (!obj || !(obj->flags & HAS_OBJ))
231                 return; /* not part of our original set */
232         if (obj->flags & REACHABLE)
233                 return; /* reachable objects already traversed */
234
235         /*
236          * Avoid passing OBJ_NONE to fsck_walk, which will parse the object
237          * (and we want to avoid parsing blobs).
238          */
239         if (obj->type == OBJ_NONE) {
240                 enum object_type type = oid_object_info(the_repository,
241                                                         &obj->oid, NULL);
242                 if (type > 0)
243                         object_as_type(the_repository, obj, type, 0);
244         }
245
246         options.walk = mark_used;
247         fsck_walk(obj, NULL, &options);
248 }
249
250 static int mark_loose_unreachable_referents(const struct object_id *oid,
251                                             const char *path,
252                                             void *data)
253 {
254         mark_unreachable_referents(oid);
255         return 0;
256 }
257
258 static int mark_packed_unreachable_referents(const struct object_id *oid,
259                                              struct packed_git *pack,
260                                              uint32_t pos,
261                                              void *data)
262 {
263         mark_unreachable_referents(oid);
264         return 0;
265 }
266
267 /*
268  * Check a single reachable object
269  */
270 static void check_reachable_object(struct object *obj)
271 {
272         /*
273          * We obviously want the object to be parsed,
274          * except if it was in a pack-file and we didn't
275          * do a full fsck
276          */
277         if (!(obj->flags & HAS_OBJ)) {
278                 if (is_promisor_object(&obj->oid))
279                         return;
280                 if (has_object_pack(&obj->oid))
281                         return; /* it is in pack - forget about it */
282                 printf_ln(_("missing %s %s"),
283                           printable_type(&obj->oid, obj->type),
284                           describe_object(&obj->oid));
285                 errors_found |= ERROR_REACHABLE;
286                 return;
287         }
288 }
289
290 /*
291  * Check a single unreachable object
292  */
293 static void check_unreachable_object(struct object *obj)
294 {
295         /*
296          * Missing unreachable object? Ignore it. It's not like
297          * we miss it (since it can't be reached), nor do we want
298          * to complain about it being unreachable (since it does
299          * not exist).
300          */
301         if (!(obj->flags & HAS_OBJ))
302                 return;
303
304         /*
305          * Unreachable object that exists? Show it if asked to,
306          * since this is something that is prunable.
307          */
308         if (show_unreachable) {
309                 printf_ln(_("unreachable %s %s"),
310                           printable_type(&obj->oid, obj->type),
311                           describe_object(&obj->oid));
312                 return;
313         }
314
315         /*
316          * "!USED" means that nothing at all points to it, including
317          * other unreachable objects. In other words, it's the "tip"
318          * of some set of unreachable objects, usually a commit that
319          * got dropped.
320          *
321          * Such starting points are more interesting than some random
322          * set of unreachable objects, so we show them even if the user
323          * hasn't asked for _all_ unreachable objects. If you have
324          * deleted a branch by mistake, this is a prime candidate to
325          * start looking at, for example.
326          */
327         if (!(obj->flags & USED)) {
328                 if (show_dangling)
329                         printf_ln(_("dangling %s %s"),
330                                   printable_type(&obj->oid, obj->type),
331                                   describe_object(&obj->oid));
332                 if (write_lost_and_found) {
333                         char *filename = git_pathdup("lost-found/%s/%s",
334                                 obj->type == OBJ_COMMIT ? "commit" : "other",
335                                 describe_object(&obj->oid));
336                         FILE *f;
337
338                         if (safe_create_leading_directories_const(filename)) {
339                                 error(_("could not create lost-found"));
340                                 free(filename);
341                                 return;
342                         }
343                         f = xfopen(filename, "w");
344                         if (obj->type == OBJ_BLOB) {
345                                 if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
346                                         die_errno(_("could not write '%s'"), filename);
347                         } else
348                                 fprintf(f, "%s\n", describe_object(&obj->oid));
349                         if (fclose(f))
350                                 die_errno(_("could not finish '%s'"),
351                                           filename);
352                         free(filename);
353                 }
354                 return;
355         }
356
357         /*
358          * Otherwise? It's there, it's unreachable, and some other unreachable
359          * object points to it. Ignore it - it's not interesting, and we showed
360          * all the interesting cases above.
361          */
362 }
363
364 static void check_object(struct object *obj)
365 {
366         if (verbose)
367                 fprintf_ln(stderr, _("Checking %s"), describe_object(&obj->oid));
368
369         if (obj->flags & REACHABLE)
370                 check_reachable_object(obj);
371         else
372                 check_unreachable_object(obj);
373 }
374
375 static void check_connectivity(void)
376 {
377         int i, max;
378
379         /* Traverse the pending reachable objects */
380         traverse_reachable();
381
382         /*
383          * With --connectivity-only, we won't have actually opened and marked
384          * unreachable objects with USED. Do that now to make --dangling, etc
385          * accurate.
386          */
387         if (connectivity_only && (show_dangling || write_lost_and_found)) {
388                 /*
389                  * Even though we already have a "struct object" for each of
390                  * these in memory, we must not iterate over the internal
391                  * object hash as we do below. Our loop would potentially
392                  * resize the hash, making our iteration invalid.
393                  *
394                  * Instead, we'll just go back to the source list of objects,
395                  * and ignore any that weren't present in our earlier
396                  * traversal.
397                  */
398                 for_each_loose_object(mark_loose_unreachable_referents, NULL, 0);
399                 for_each_packed_object(mark_packed_unreachable_referents, NULL, 0);
400         }
401
402         /* Look up all the requirements, warn about missing objects.. */
403         max = get_max_object_index();
404         if (verbose)
405                 fprintf_ln(stderr, _("Checking connectivity (%d objects)"), max);
406
407         for (i = 0; i < max; i++) {
408                 struct object *obj = get_indexed_object(i);
409
410                 if (obj)
411                         check_object(obj);
412         }
413 }
414
415 static int fsck_obj(struct object *obj, void *buffer, unsigned long size)
416 {
417         int err;
418
419         if (obj->flags & SEEN)
420                 return 0;
421         obj->flags |= SEEN;
422
423         if (verbose)
424                 fprintf_ln(stderr, _("Checking %s %s"),
425                            printable_type(&obj->oid, obj->type),
426                            describe_object(&obj->oid));
427
428         if (fsck_walk(obj, NULL, &fsck_obj_options))
429                 objerror(obj, _("broken links"));
430         err = fsck_object(obj, buffer, size, &fsck_obj_options);
431         if (err)
432                 goto out;
433
434         if (obj->type == OBJ_COMMIT) {
435                 struct commit *commit = (struct commit *) obj;
436
437                 if (!commit->parents && show_root)
438                         printf_ln(_("root %s"),
439                                   describe_object(&commit->object.oid));
440         }
441
442         if (obj->type == OBJ_TAG) {
443                 struct tag *tag = (struct tag *) obj;
444
445                 if (show_tags && tag->tagged) {
446                         printf_ln(_("tagged %s %s (%s) in %s"),
447                                   printable_type(&tag->tagged->oid, tag->tagged->type),
448                                   describe_object(&tag->tagged->oid),
449                                   tag->tag,
450                                   describe_object(&tag->object.oid));
451                 }
452         }
453
454 out:
455         if (obj->type == OBJ_TREE)
456                 free_tree_buffer((struct tree *)obj);
457         if (obj->type == OBJ_COMMIT)
458                 free_commit_buffer(the_repository->parsed_objects,
459                                    (struct commit *)obj);
460         return err;
461 }
462
463 static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
464                            unsigned long size, void *buffer, int *eaten)
465 {
466         /*
467          * Note, buffer may be NULL if type is OBJ_BLOB. See
468          * verify_packfile(), data_valid variable for details.
469          */
470         struct object *obj;
471         obj = parse_object_buffer(the_repository, oid, type, size, buffer,
472                                   eaten);
473         if (!obj) {
474                 errors_found |= ERROR_OBJECT;
475                 return error(_("%s: object corrupt or missing"),
476                              oid_to_hex(oid));
477         }
478         obj->flags &= ~(REACHABLE | SEEN);
479         obj->flags |= HAS_OBJ;
480         return fsck_obj(obj, buffer, size);
481 }
482
483 static int default_refs;
484
485 static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
486         timestamp_t timestamp)
487 {
488         struct object *obj;
489
490         if (!is_null_oid(oid)) {
491                 obj = lookup_object(the_repository, oid);
492                 if (obj && (obj->flags & HAS_OBJ)) {
493                         if (timestamp)
494                                 fsck_put_object_name(&fsck_walk_options, oid,
495                                                      "%s@{%"PRItime"}",
496                                                      refname, timestamp);
497                         obj->flags |= USED;
498                         mark_object_reachable(obj);
499                 } else if (!is_promisor_object(oid)) {
500                         error(_("%s: invalid reflog entry %s"),
501                               refname, oid_to_hex(oid));
502                         errors_found |= ERROR_REACHABLE;
503                 }
504         }
505 }
506
507 static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid,
508                 const char *email, timestamp_t timestamp, int tz,
509                 const char *message, void *cb_data)
510 {
511         const char *refname = cb_data;
512
513         if (verbose)
514                 fprintf_ln(stderr, _("Checking reflog %s->%s"),
515                            oid_to_hex(ooid), oid_to_hex(noid));
516
517         fsck_handle_reflog_oid(refname, ooid, 0);
518         fsck_handle_reflog_oid(refname, noid, timestamp);
519         return 0;
520 }
521
522 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
523                               int flag, void *cb_data)
524 {
525         struct strbuf refname = STRBUF_INIT;
526
527         strbuf_worktree_ref(cb_data, &refname, logname);
528         for_each_reflog_ent(refname.buf, fsck_handle_reflog_ent, refname.buf);
529         strbuf_release(&refname);
530         return 0;
531 }
532
533 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
534                            int flag, void *cb_data)
535 {
536         struct object *obj;
537
538         obj = parse_object(the_repository, oid);
539         if (!obj) {
540                 if (is_promisor_object(oid)) {
541                         /*
542                          * Increment default_refs anyway, because this is a
543                          * valid ref.
544                          */
545                          default_refs++;
546                          return 0;
547                 }
548                 error(_("%s: invalid sha1 pointer %s"),
549                       refname, oid_to_hex(oid));
550                 errors_found |= ERROR_REACHABLE;
551                 /* We'll continue with the rest despite the error.. */
552                 return 0;
553         }
554         if (obj->type != OBJ_COMMIT && is_branch(refname)) {
555                 error(_("%s: not a commit"), refname);
556                 errors_found |= ERROR_REFS;
557         }
558         default_refs++;
559         obj->flags |= USED;
560         fsck_put_object_name(&fsck_walk_options,
561                              oid, "%s", refname);
562         mark_object_reachable(obj);
563
564         return 0;
565 }
566
567 static int fsck_head_link(const char *head_ref_name,
568                           const char **head_points_at,
569                           struct object_id *head_oid);
570
571 static void get_default_heads(void)
572 {
573         struct worktree **worktrees, **p;
574         const char *head_points_at;
575         struct object_id head_oid;
576
577         for_each_rawref(fsck_handle_ref, NULL);
578
579         worktrees = get_worktrees(0);
580         for (p = worktrees; *p; p++) {
581                 struct worktree *wt = *p;
582                 struct strbuf ref = STRBUF_INIT;
583
584                 strbuf_worktree_ref(wt, &ref, "HEAD");
585                 fsck_head_link(ref.buf, &head_points_at, &head_oid);
586                 if (head_points_at && !is_null_oid(&head_oid))
587                         fsck_handle_ref(ref.buf, &head_oid, 0, NULL);
588                 strbuf_release(&ref);
589
590                 if (include_reflogs)
591                         refs_for_each_reflog(get_worktree_ref_store(wt),
592                                              fsck_handle_reflog, wt);
593         }
594         free_worktrees(worktrees);
595
596         /*
597          * Not having any default heads isn't really fatal, but
598          * it does mean that "--unreachable" no longer makes any
599          * sense (since in this case everything will obviously
600          * be unreachable by definition.
601          *
602          * Showing dangling objects is valid, though (as those
603          * dangling objects are likely lost heads).
604          *
605          * So we just print a warning about it, and clear the
606          * "show_unreachable" flag.
607          */
608         if (!default_refs) {
609                 fprintf_ln(stderr, _("notice: No default references"));
610                 show_unreachable = 0;
611         }
612 }
613
614 static int fsck_loose(const struct object_id *oid, const char *path, void *data)
615 {
616         struct object *obj;
617         enum object_type type;
618         unsigned long size;
619         void *contents;
620         int eaten;
621
622         if (read_loose_object(path, oid, &type, &size, &contents) < 0) {
623                 errors_found |= ERROR_OBJECT;
624                 error(_("%s: object corrupt or missing: %s"),
625                       oid_to_hex(oid), path);
626                 return 0; /* keep checking other objects */
627         }
628
629         if (!contents && type != OBJ_BLOB)
630                 BUG("read_loose_object streamed a non-blob");
631
632         obj = parse_object_buffer(the_repository, oid, type, size,
633                                   contents, &eaten);
634
635         if (!obj) {
636                 errors_found |= ERROR_OBJECT;
637                 error(_("%s: object could not be parsed: %s"),
638                       oid_to_hex(oid), path);
639                 if (!eaten)
640                         free(contents);
641                 return 0; /* keep checking other objects */
642         }
643
644         obj->flags &= ~(REACHABLE | SEEN);
645         obj->flags |= HAS_OBJ;
646         if (fsck_obj(obj, contents, size))
647                 errors_found |= ERROR_OBJECT;
648
649         if (!eaten)
650                 free(contents);
651         return 0; /* keep checking other objects, even if we saw an error */
652 }
653
654 static int fsck_cruft(const char *basename, const char *path, void *data)
655 {
656         if (!starts_with(basename, "tmp_obj_"))
657                 fprintf_ln(stderr, _("bad sha1 file: %s"), path);
658         return 0;
659 }
660
661 static int fsck_subdir(unsigned int nr, const char *path, void *progress)
662 {
663         display_progress(progress, nr + 1);
664         return 0;
665 }
666
667 static void fsck_object_dir(const char *path)
668 {
669         struct progress *progress = NULL;
670
671         if (verbose)
672                 fprintf_ln(stderr, _("Checking object directory"));
673
674         if (show_progress)
675                 progress = start_progress(_("Checking object directories"), 256);
676
677         for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
678                                       progress);
679         display_progress(progress, 256);
680         stop_progress(&progress);
681 }
682
683 static int fsck_head_link(const char *head_ref_name,
684                           const char **head_points_at,
685                           struct object_id *head_oid)
686 {
687         int null_is_error = 0;
688
689         if (verbose)
690                 fprintf_ln(stderr, _("Checking %s link"), head_ref_name);
691
692         *head_points_at = resolve_ref_unsafe(head_ref_name, 0, head_oid, NULL);
693         if (!*head_points_at) {
694                 errors_found |= ERROR_REFS;
695                 return error(_("invalid %s"), head_ref_name);
696         }
697         if (!strcmp(*head_points_at, head_ref_name))
698                 /* detached HEAD */
699                 null_is_error = 1;
700         else if (!starts_with(*head_points_at, "refs/heads/")) {
701                 errors_found |= ERROR_REFS;
702                 return error(_("%s points to something strange (%s)"),
703                              head_ref_name, *head_points_at);
704         }
705         if (is_null_oid(head_oid)) {
706                 if (null_is_error) {
707                         errors_found |= ERROR_REFS;
708                         return error(_("%s: detached HEAD points at nothing"),
709                                      head_ref_name);
710                 }
711                 fprintf_ln(stderr,
712                            _("notice: %s points to an unborn branch (%s)"),
713                            head_ref_name, *head_points_at + 11);
714         }
715         return 0;
716 }
717
718 static int fsck_cache_tree(struct cache_tree *it)
719 {
720         int i;
721         int err = 0;
722
723         if (verbose)
724                 fprintf_ln(stderr, _("Checking cache tree"));
725
726         if (0 <= it->entry_count) {
727                 struct object *obj = parse_object(the_repository, &it->oid);
728                 if (!obj) {
729                         error(_("%s: invalid sha1 pointer in cache-tree"),
730                               oid_to_hex(&it->oid));
731                         errors_found |= ERROR_REFS;
732                         return 1;
733                 }
734                 obj->flags |= USED;
735                 fsck_put_object_name(&fsck_walk_options, &it->oid, ":");
736                 mark_object_reachable(obj);
737                 if (obj->type != OBJ_TREE)
738                         err |= objerror(obj, _("non-tree in cache-tree"));
739         }
740         for (i = 0; i < it->subtree_nr; i++)
741                 err |= fsck_cache_tree(it->down[i]->cache_tree);
742         return err;
743 }
744
745 static void mark_object_for_connectivity(const struct object_id *oid)
746 {
747         struct object *obj = lookup_unknown_object(oid);
748         obj->flags |= HAS_OBJ;
749 }
750
751 static int mark_loose_for_connectivity(const struct object_id *oid,
752                                        const char *path,
753                                        void *data)
754 {
755         mark_object_for_connectivity(oid);
756         return 0;
757 }
758
759 static int mark_packed_for_connectivity(const struct object_id *oid,
760                                         struct packed_git *pack,
761                                         uint32_t pos,
762                                         void *data)
763 {
764         mark_object_for_connectivity(oid);
765         return 0;
766 }
767
768 static char const * const fsck_usage[] = {
769         N_("git fsck [<options>] [<object>...]"),
770         NULL
771 };
772
773 static struct option fsck_opts[] = {
774         OPT__VERBOSE(&verbose, N_("be verbose")),
775         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
776         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
777         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
778         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
779         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
780         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
781         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
782         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
783         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
784         OPT_BOOL(0, "lost-found", &write_lost_and_found,
785                                 N_("write dangling objects in .git/lost-found")),
786         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
787         OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
788         OPT_END(),
789 };
790
791 int cmd_fsck(int argc, const char **argv, const char *prefix)
792 {
793         int i;
794         struct object_directory *odb;
795
796         /* fsck knows how to handle missing promisor objects */
797         fetch_if_missing = 0;
798
799         errors_found = 0;
800         read_replace_refs = 0;
801
802         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
803
804         fsck_walk_options.walk = mark_object;
805         fsck_obj_options.walk = mark_used;
806         fsck_obj_options.error_func = fsck_error_func;
807         if (check_strict)
808                 fsck_obj_options.strict = 1;
809
810         if (show_progress == -1)
811                 show_progress = isatty(2);
812         if (verbose)
813                 show_progress = 0;
814
815         if (write_lost_and_found) {
816                 check_full = 1;
817                 include_reflogs = 0;
818         }
819
820         if (name_objects)
821                 fsck_enable_object_names(&fsck_walk_options);
822
823         git_config(fsck_config, NULL);
824
825         if (connectivity_only) {
826                 for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
827                 for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
828         } else {
829                 prepare_alt_odb(the_repository);
830                 for (odb = the_repository->objects->odb; odb; odb = odb->next)
831                         fsck_object_dir(odb->path);
832
833                 if (check_full) {
834                         struct packed_git *p;
835                         uint32_t total = 0, count = 0;
836                         struct progress *progress = NULL;
837
838                         if (show_progress) {
839                                 for (p = get_all_packs(the_repository); p;
840                                      p = p->next) {
841                                         if (open_pack_index(p))
842                                                 continue;
843                                         total += p->num_objects;
844                                 }
845
846                                 progress = start_progress(_("Checking objects"), total);
847                         }
848                         for (p = get_all_packs(the_repository); p;
849                              p = p->next) {
850                                 /* verify gives error messages itself */
851                                 if (verify_pack(the_repository,
852                                                 p, fsck_obj_buffer,
853                                                 progress, count))
854                                         errors_found |= ERROR_PACK;
855                                 count += p->num_objects;
856                         }
857                         stop_progress(&progress);
858                 }
859
860                 if (fsck_finish(&fsck_obj_options))
861                         errors_found |= ERROR_OBJECT;
862         }
863
864         for (i = 0; i < argc; i++) {
865                 const char *arg = argv[i];
866                 struct object_id oid;
867                 if (!get_oid(arg, &oid)) {
868                         struct object *obj = lookup_object(the_repository,
869                                                            &oid);
870
871                         if (!obj || !(obj->flags & HAS_OBJ)) {
872                                 if (is_promisor_object(&oid))
873                                         continue;
874                                 error(_("%s: object missing"), oid_to_hex(&oid));
875                                 errors_found |= ERROR_OBJECT;
876                                 continue;
877                         }
878
879                         obj->flags |= USED;
880                         fsck_put_object_name(&fsck_walk_options, &oid,
881                                              "%s", arg);
882                         mark_object_reachable(obj);
883                         continue;
884                 }
885                 error(_("invalid parameter: expected sha1, got '%s'"), arg);
886                 errors_found |= ERROR_OBJECT;
887         }
888
889         /*
890          * If we've not been given any explicit head information, do the
891          * default ones from .git/refs. We also consider the index file
892          * in this case (ie this implies --cache).
893          */
894         if (!argc) {
895                 get_default_heads();
896                 keep_cache_objects = 1;
897         }
898
899         if (keep_cache_objects) {
900                 verify_index_checksum = 1;
901                 verify_ce_order = 1;
902                 read_cache();
903                 for (i = 0; i < active_nr; i++) {
904                         unsigned int mode;
905                         struct blob *blob;
906                         struct object *obj;
907
908                         mode = active_cache[i]->ce_mode;
909                         if (S_ISGITLINK(mode))
910                                 continue;
911                         blob = lookup_blob(the_repository,
912                                            &active_cache[i]->oid);
913                         if (!blob)
914                                 continue;
915                         obj = &blob->object;
916                         obj->flags |= USED;
917                         fsck_put_object_name(&fsck_walk_options, &obj->oid,
918                                              ":%s", active_cache[i]->name);
919                         mark_object_reachable(obj);
920                 }
921                 if (active_cache_tree)
922                         fsck_cache_tree(active_cache_tree);
923         }
924
925         check_connectivity();
926
927         if (!git_config_get_bool("core.commitgraph", &i) && i) {
928                 struct child_process commit_graph_verify = CHILD_PROCESS_INIT;
929                 const char *verify_argv[] = { "commit-graph", "verify", NULL, NULL, NULL };
930
931                 prepare_alt_odb(the_repository);
932                 for (odb = the_repository->objects->odb; odb; odb = odb->next) {
933                         child_process_init(&commit_graph_verify);
934                         commit_graph_verify.argv = verify_argv;
935                         commit_graph_verify.git_cmd = 1;
936                         verify_argv[2] = "--object-dir";
937                         verify_argv[3] = odb->path;
938                         if (run_command(&commit_graph_verify))
939                                 errors_found |= ERROR_COMMIT_GRAPH;
940                 }
941         }
942
943         if (!git_config_get_bool("core.multipackindex", &i) && i) {
944                 struct child_process midx_verify = CHILD_PROCESS_INIT;
945                 const char *midx_argv[] = { "multi-pack-index", "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(&midx_verify);
950                         midx_verify.argv = midx_argv;
951                         midx_verify.git_cmd = 1;
952                         midx_argv[2] = "--object-dir";
953                         midx_argv[3] = odb->path;
954                         if (run_command(&midx_verify))
955                                 errors_found |= ERROR_COMMIT_GRAPH;
956                 }
957         }
958
959         return errors_found;
960 }