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