git.oblomov.eu Git - git/blob - builtin/fsck.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "commit.h"
   4 #include "tree.h"
   5 #include "blob.h"
   6 #include "tag.h"
   7 #include "refs.h"
   8 #include "pack.h"
   9 #include "cache-tree.h"
  10 #include "tree-walk.h"
  11 #include "fsck.h"
  12 #include "parse-options.h"
  13 #include "dir.h"
  14 #include "progress.h"
  15 #include "streaming.h"
  16
  17 #define REACHABLE 0x0001
  18 #define SEEN      0x0002
  19 #define HAS_OBJ   0x0004
  20
  21 static int show_root;
  22 static int show_tags;
  23 static int show_unreachable;
  24 static int include_reflogs = 1;
  25 static int check_full = 1;
  26 static int check_strict;
  27 static int keep_cache_objects;
  28 static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
  29 static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
  30 static struct object_id head_oid;
  31 static const char *head_points_at;
  32 static int errors_found;
  33 static int write_lost_and_found;
  34 static int verbose;
  35 static int show_progress = -1;
  36 static int show_dangling = 1;
  37 #define ERROR_OBJECT 01
  38 #define ERROR_REACHABLE 02
  39 #define ERROR_PACK 04
  40
  41 #ifdef NO_D_INO_IN_DIRENT
  42 #define SORT_DIRENT 0
  43 #define DIRENT_SORT_HINT(de) 0
  44 #else
  45 #define SORT_DIRENT 1
  46 #define DIRENT_SORT_HINT(de) ((de)->d_ino)
  47 #endif
  48
  49 static void objreport(struct object *obj, const char *msg_type,
  50                         const char *err)
  51 {
  52         fprintf(stderr, "%s in %s %s: %s\n",
  53                 msg_type, typename(obj->type), sha1_to_hex(obj->sha1), err);
  54 }
  55
  56 static int objerror(struct object *obj, const char *err)
  57 {
  58         errors_found |= ERROR_OBJECT;
  59         objreport(obj, "error", err);
  60         return -1;
  61 }
  62
  63 static int fsck_error_func(struct object *obj, int type, const char *message)
  64 {
  65         objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message);
  66         return (type == FSCK_WARN) ? 0 : 1;
  67 }
  68
  69 static struct object_array pending;
  70
  71 static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
  72 {
  73         struct object *parent = data;
  74
  75         /*
  76          * The only case data is NULL or type is OBJ_ANY is when
  77          * mark_object_reachable() calls us.  All the callers of
  78          * that function has non-NULL obj hence ...
  79          */
  80         if (!obj) {
  81                 /* ... these references to parent->fld are safe here */
  82                 printf("broken link from %7s %s\n",
  83                            typename(parent->type), sha1_to_hex(parent->sha1));
  84                 printf("broken link from %7s %s\n",
  85                            (type == OBJ_ANY ? "unknown" : typename(type)), "unknown");
  86                 errors_found |= ERROR_REACHABLE;
  87                 return 1;
  88         }
  89
  90         if (type != OBJ_ANY && obj->type != type)
  91                 /* ... and the reference to parent is safe here */
  92                 objerror(parent, "wrong object type in link");
  93
  94         if (obj->flags & REACHABLE)
  95                 return 0;
  96         obj->flags |= REACHABLE;
  97         if (!(obj->flags & HAS_OBJ)) {
  98                 if (parent && !has_sha1_file(obj->sha1)) {
  99                         printf("broken link from %7s %s\n",
 100                                  typename(parent->type), sha1_to_hex(parent->sha1));
 101                         printf("              to %7s %s\n",
 102                                  typename(obj->type), sha1_to_hex(obj->sha1));
 103                         errors_found |= ERROR_REACHABLE;
 104                 }
 105                 return 1;
 106         }
 107
 108         add_object_array(obj, NULL, &pending);
 109         return 0;
 110 }
 111
 112 static void mark_object_reachable(struct object *obj)
 113 {
 114         mark_object(obj, OBJ_ANY, NULL, NULL);
 115 }
 116
 117 static int traverse_one_object(struct object *obj)
 118 {
 119         int result;
 120         struct tree *tree = NULL;
 121
 122         if (obj->type == OBJ_TREE) {
 123                 tree = (struct tree *)obj;
 124                 if (parse_tree(tree) < 0)
 125                         return 1; /* error already displayed */
 126         }
 127         result = fsck_walk(obj, obj, &fsck_walk_options);
 128         if (tree)
 129                 free_tree_buffer(tree);
 130         return result;
 131 }
 132
 133 static int traverse_reachable(void)
 134 {
 135         struct progress *progress = NULL;
 136         unsigned int nr = 0;
 137         int result = 0;
 138         if (show_progress)
 139                 progress = start_progress_delay(_("Checking connectivity"), 0, 0, 2);
 140         while (pending.nr) {
 141                 struct object_array_entry *entry;
 142                 struct object *obj;
 143
 144                 entry = pending.objects + --pending.nr;
 145                 obj = entry->item;
 146                 result |= traverse_one_object(obj);
 147                 display_progress(progress, ++nr);
 148         }
 149         stop_progress(&progress);
 150         return !!result;
 151 }
 152
 153 static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
 154 {
 155         if (!obj)
 156                 return 1;
 157         obj->used = 1;
 158         return 0;
 159 }
 160
 161 /*
 162  * Check a single reachable object
 163  */
 164 static void check_reachable_object(struct object *obj)
 165 {
 166         /*
 167          * We obviously want the object to be parsed,
 168          * except if it was in a pack-file and we didn't
 169          * do a full fsck
 170          */
 171         if (!(obj->flags & HAS_OBJ)) {
 172                 if (has_sha1_pack(obj->sha1))
 173                         return; /* it is in pack - forget about it */
 174                 printf("missing %s %s\n", typename(obj->type), sha1_to_hex(obj->sha1));
 175                 errors_found |= ERROR_REACHABLE;
 176                 return;
 177         }
 178 }
 179
 180 /*
 181  * Check a single unreachable object
 182  */
 183 static void check_unreachable_object(struct object *obj)
 184 {
 185         /*
 186          * Missing unreachable object? Ignore it. It's not like
 187          * we miss it (since it can't be reached), nor do we want
 188          * to complain about it being unreachable (since it does
 189          * not exist).
 190          */
 191         if (!obj->parsed)
 192                 return;
 193
 194         /*
 195          * Unreachable object that exists? Show it if asked to,
 196          * since this is something that is prunable.
 197          */
 198         if (show_unreachable) {
 199                 printf("unreachable %s %s\n", typename(obj->type), sha1_to_hex(obj->sha1));
 200                 return;
 201         }
 202
 203         /*
 204          * "!used" means that nothing at all points to it, including
 205          * other unreachable objects. In other words, it's the "tip"
 206          * of some set of unreachable objects, usually a commit that
 207          * got dropped.
 208          *
 209          * Such starting points are more interesting than some random
 210          * set of unreachable objects, so we show them even if the user
 211          * hasn't asked for _all_ unreachable objects. If you have
 212          * deleted a branch by mistake, this is a prime candidate to
 213          * start looking at, for example.
 214          */
 215         if (!obj->used) {
 216                 if (show_dangling)
 217                         printf("dangling %s %s\n", typename(obj->type),
 218                                sha1_to_hex(obj->sha1));
 219                 if (write_lost_and_found) {
 220                         const char *filename = git_path("lost-found/%s/%s",
 221                                 obj->type == OBJ_COMMIT ? "commit" : "other",
 222                                 sha1_to_hex(obj->sha1));
 223                         FILE *f;
 224
 225                         if (safe_create_leading_directories_const(filename)) {
 226                                 error("Could not create lost-found");
 227                                 return;
 228                         }
 229                         if (!(f = fopen(filename, "w")))
 230                                 die_errno("Could not open '%s'", filename);
 231                         if (obj->type == OBJ_BLOB) {
 232                                 if (stream_blob_to_fd(fileno(f), obj->sha1, NULL, 1))
 233                                         die_errno("Could not write '%s'", filename);
 234                         } else
 235                                 fprintf(f, "%s\n", sha1_to_hex(obj->sha1));
 236                         if (fclose(f))
 237                                 die_errno("Could not finish '%s'",
 238                                           filename);
 239                 }
 240                 return;
 241         }
 242
 243         /*
 244          * Otherwise? It's there, it's unreachable, and some other unreachable
 245          * object points to it. Ignore it - it's not interesting, and we showed
 246          * all the interesting cases above.
 247          */
 248 }
 249
 250 static void check_object(struct object *obj)
 251 {
 252         if (verbose)
 253                 fprintf(stderr, "Checking %s\n", sha1_to_hex(obj->sha1));
 254
 255         if (obj->flags & REACHABLE)
 256                 check_reachable_object(obj);
 257         else
 258                 check_unreachable_object(obj);
 259 }
 260
 261 static void check_connectivity(void)
 262 {
 263         int i, max;
 264
 265         /* Traverse the pending reachable objects */
 266         traverse_reachable();
 267
 268         /* Look up all the requirements, warn about missing objects.. */
 269         max = get_max_object_index();
 270         if (verbose)
 271                 fprintf(stderr, "Checking connectivity (%d objects)\n", max);
 272
 273         for (i = 0; i < max; i++) {
 274                 struct object *obj = get_indexed_object(i);
 275
 276                 if (obj)
 277                         check_object(obj);
 278         }
 279 }
 280
 281 static int fsck_obj(struct object *obj)
 282 {
 283         if (obj->flags & SEEN)
 284                 return 0;
 285         obj->flags |= SEEN;
 286
 287         if (verbose)
 288                 fprintf(stderr, "Checking %s %s\n",
 289                         typename(obj->type), sha1_to_hex(obj->sha1));
 290
 291         if (fsck_walk(obj, NULL, &fsck_obj_options))
 292                 objerror(obj, "broken links");
 293         if (fsck_object(obj, NULL, 0, &fsck_obj_options))
 294                 return -1;
 295
 296         if (obj->type == OBJ_TREE) {
 297                 struct tree *item = (struct tree *) obj;
 298
 299                 free_tree_buffer(item);
 300         }
 301
 302         if (obj->type == OBJ_COMMIT) {
 303                 struct commit *commit = (struct commit *) obj;
 304
 305                 free_commit_buffer(commit);
 306
 307                 if (!commit->parents && show_root)
 308                         printf("root %s\n", sha1_to_hex(commit->object.sha1));
 309         }
 310
 311         if (obj->type == OBJ_TAG) {
 312                 struct tag *tag = (struct tag *) obj;
 313
 314                 if (show_tags && tag->tagged) {
 315                         printf("tagged %s %s", typename(tag->tagged->type), sha1_to_hex(tag->tagged->sha1));
 316                         printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1));
 317                 }
 318         }
 319
 320         return 0;
 321 }
 322
 323 static int fsck_sha1(const unsigned char *sha1)
 324 {
 325         struct object *obj = parse_object(sha1);
 326         if (!obj) {
 327                 errors_found |= ERROR_OBJECT;
 328                 return error("%s: object corrupt or missing",
 329                              sha1_to_hex(sha1));
 330         }
 331         obj->flags |= HAS_OBJ;
 332         return fsck_obj(obj);
 333 }
 334
 335 static int fsck_obj_buffer(const unsigned char *sha1, enum object_type type,
 336                            unsigned long size, void *buffer, int *eaten)
 337 {
 338         struct object *obj;
 339         obj = parse_object_buffer(sha1, type, size, buffer, eaten);
 340         if (!obj) {
 341                 errors_found |= ERROR_OBJECT;
 342                 return error("%s: object corrupt or missing", sha1_to_hex(sha1));
 343         }
 344         obj->flags = HAS_OBJ;
 345         return fsck_obj(obj);
 346 }
 347
 348 /*
 349  * This is the sorting chunk size: make it reasonably
 350  * big so that we can sort well..
 351  */
 352 #define MAX_SHA1_ENTRIES (1024)
 353
 354 struct sha1_entry {
 355         unsigned long ino;
 356         unsigned char sha1[20];
 357 };
 358
 359 static struct {
 360         unsigned long nr;
 361         struct sha1_entry *entry[MAX_SHA1_ENTRIES];
 362 } sha1_list;
 363
 364 static int ino_compare(const void *_a, const void *_b)
 365 {
 366         const struct sha1_entry *a = _a, *b = _b;
 367         unsigned long ino1 = a->ino, ino2 = b->ino;
 368         return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
 369 }
 370
 371 static void fsck_sha1_list(void)
 372 {
 373         int i, nr = sha1_list.nr;
 374
 375         if (SORT_DIRENT)
 376                 qsort(sha1_list.entry, nr,
 377                       sizeof(struct sha1_entry *), ino_compare);
 378         for (i = 0; i < nr; i++) {
 379                 struct sha1_entry *entry = sha1_list.entry[i];
 380                 unsigned char *sha1 = entry->sha1;
 381
 382                 sha1_list.entry[i] = NULL;
 383                 if (fsck_sha1(sha1))
 384                         errors_found |= ERROR_OBJECT;
 385                 free(entry);
 386         }
 387         sha1_list.nr = 0;
 388 }
 389
 390 static void add_sha1_list(unsigned char *sha1, unsigned long ino)
 391 {
 392         struct sha1_entry *entry = xmalloc(sizeof(*entry));
 393         int nr;
 394
 395         entry->ino = ino;
 396         hashcpy(entry->sha1, sha1);
 397         nr = sha1_list.nr;
 398         if (nr == MAX_SHA1_ENTRIES) {
 399                 fsck_sha1_list();
 400                 nr = 0;
 401         }
 402         sha1_list.entry[nr] = entry;
 403         sha1_list.nr = ++nr;
 404 }
 405
 406 static inline int is_loose_object_file(struct dirent *de,
 407                                        char *name, unsigned char *sha1)
 408 {
 409         if (strlen(de->d_name) != 38)
 410                 return 0;
 411         memcpy(name + 2, de->d_name, 39);
 412         return !get_sha1_hex(name, sha1);
 413 }
 414
 415 static void fsck_dir(int i, char *path)
 416 {
 417         DIR *dir = opendir(path);
 418         struct dirent *de;
 419         char name[100];
 420
 421         if (!dir)
 422                 return;
 423
 424         if (verbose)
 425                 fprintf(stderr, "Checking directory %s\n", path);
 426
 427         sprintf(name, "%02x", i);
 428         while ((de = readdir(dir)) != NULL) {
 429                 unsigned char sha1[20];
 430
 431                 if (is_dot_or_dotdot(de->d_name))
 432                         continue;
 433                 if (is_loose_object_file(de, name, sha1)) {
 434                         add_sha1_list(sha1, DIRENT_SORT_HINT(de));
 435                         continue;
 436                 }
 437                 if (starts_with(de->d_name, "tmp_obj_"))
 438                         continue;
 439                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 440         }
 441         closedir(dir);
 442 }
 443
 444 static int default_refs;
 445
 446 static int fsck_handle_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 447                 const char *email, unsigned long timestamp, int tz,
 448                 const char *message, void *cb_data)
 449 {
 450         struct object *obj;
 451
 452         if (verbose)
 453                 fprintf(stderr, "Checking reflog %s->%s\n",
 454                         sha1_to_hex(osha1), sha1_to_hex(nsha1));
 455
 456         if (!is_null_sha1(osha1)) {
 457                 obj = lookup_object(osha1);
 458                 if (obj) {
 459                         obj->used = 1;
 460                         mark_object_reachable(obj);
 461                 }
 462         }
 463         obj = lookup_object(nsha1);
 464         if (obj) {
 465                 obj->used = 1;
 466                 mark_object_reachable(obj);
 467         }
 468         return 0;
 469 }
 470
 471 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
 472                               int flag, void *cb_data)
 473 {
 474         for_each_reflog_ent(logname, fsck_handle_reflog_ent, NULL);
 475         return 0;
 476 }
 477
 478 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 479                            int flag, void *cb_data)
 480 {
 481         struct object *obj;
 482
 483         obj = parse_object(oid->hash);
 484         if (!obj) {
 485                 error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
 486                 errors_found |= ERROR_REACHABLE;
 487                 /* We'll continue with the rest despite the error.. */
 488                 return 0;
 489         }
 490         if (obj->type != OBJ_COMMIT && is_branch(refname))
 491                 error("%s: not a commit", refname);
 492         default_refs++;
 493         obj->used = 1;
 494         mark_object_reachable(obj);
 495
 496         return 0;
 497 }
 498
 499 static void get_default_heads(void)
 500 {
 501         if (head_points_at && !is_null_oid(&head_oid))
 502                 fsck_handle_ref("HEAD", &head_oid, 0, NULL);
 503         for_each_rawref(fsck_handle_ref, NULL);
 504         if (include_reflogs)
 505                 for_each_reflog(fsck_handle_reflog, NULL);
 506
 507         /*
 508          * Not having any default heads isn't really fatal, but
 509          * it does mean that "--unreachable" no longer makes any
 510          * sense (since in this case everything will obviously
 511          * be unreachable by definition.
 512          *
 513          * Showing dangling objects is valid, though (as those
 514          * dangling objects are likely lost heads).
 515          *
 516          * So we just print a warning about it, and clear the
 517          * "show_unreachable" flag.
 518          */
 519         if (!default_refs) {
 520                 fprintf(stderr, "notice: No default references\n");
 521                 show_unreachable = 0;
 522         }
 523 }
 524
 525 static void fsck_object_dir(const char *path)
 526 {
 527         int i;
 528         struct progress *progress = NULL;
 529
 530         if (verbose)
 531                 fprintf(stderr, "Checking object directory\n");
 532
 533         if (show_progress)
 534                 progress = start_progress(_("Checking object directories"), 256);
 535         for (i = 0; i < 256; i++) {
 536                 static char dir[4096];
 537                 sprintf(dir, "%s/%02x", path, i);
 538                 fsck_dir(i, dir);
 539                 display_progress(progress, i+1);
 540         }
 541         stop_progress(&progress);
 542         fsck_sha1_list();
 543 }
 544
 545 static int fsck_head_link(void)
 546 {
 547         int flag;
 548         int null_is_error = 0;
 549
 550         if (verbose)
 551                 fprintf(stderr, "Checking HEAD link\n");
 552
 553         head_points_at = resolve_ref_unsafe("HEAD", 0, head_oid.hash, &flag);
 554         if (!head_points_at)
 555                 return error("Invalid HEAD");
 556         if (!strcmp(head_points_at, "HEAD"))
 557                 /* detached HEAD */
 558                 null_is_error = 1;
 559         else if (!starts_with(head_points_at, "refs/heads/"))
 560                 return error("HEAD points to something strange (%s)",
 561                              head_points_at);
 562         if (is_null_oid(&head_oid)) {
 563                 if (null_is_error)
 564                         return error("HEAD: detached HEAD points at nothing");
 565                 fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
 566                         head_points_at + 11);
 567         }
 568         return 0;
 569 }
 570
 571 static int fsck_cache_tree(struct cache_tree *it)
 572 {
 573         int i;
 574         int err = 0;
 575
 576         if (verbose)
 577                 fprintf(stderr, "Checking cache tree\n");
 578
 579         if (0 <= it->entry_count) {
 580                 struct object *obj = parse_object(it->sha1);
 581                 if (!obj) {
 582                         error("%s: invalid sha1 pointer in cache-tree",
 583                               sha1_to_hex(it->sha1));
 584                         return 1;
 585                 }
 586                 obj->used = 1;
 587                 mark_object_reachable(obj);
 588                 if (obj->type != OBJ_TREE)
 589                         err |= objerror(obj, "non-tree in cache-tree");
 590         }
 591         for (i = 0; i < it->subtree_nr; i++)
 592                 err |= fsck_cache_tree(it->down[i]->cache_tree);
 593         return err;
 594 }
 595
 596 static char const * const fsck_usage[] = {
 597         N_("git fsck [<options>] [<object>...]"),
 598         NULL
 599 };
 600
 601 static struct option fsck_opts[] = {
 602         OPT__VERBOSE(&verbose, N_("be verbose")),
 603         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
 604         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
 605         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
 606         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
 607         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
 608         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
 609         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
 610         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
 611         OPT_BOOL(0, "lost-found", &write_lost_and_found,
 612                                 N_("write dangling objects in .git/lost-found")),
 613         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 614         OPT_END(),
 615 };
 616
 617 int cmd_fsck(int argc, const char **argv, const char *prefix)
 618 {
 619         int i, heads;
 620         struct alternate_object_database *alt;
 621
 622         errors_found = 0;
 623         check_replace_refs = 0;
 624
 625         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 626
 627         fsck_walk_options.walk = mark_object;
 628         fsck_obj_options.walk = mark_used;
 629         fsck_obj_options.error_func = fsck_error_func;
 630         if (check_strict)
 631                 fsck_obj_options.strict = 1;
 632
 633         if (show_progress == -1)
 634                 show_progress = isatty(2);
 635         if (verbose)
 636                 show_progress = 0;
 637
 638         if (write_lost_and_found) {
 639                 check_full = 1;
 640                 include_reflogs = 0;
 641         }
 642
 643         fsck_head_link();
 644         fsck_object_dir(get_object_directory());
 645
 646         prepare_alt_odb();
 647         for (alt = alt_odb_list; alt; alt = alt->next) {
 648                 char namebuf[PATH_MAX];
 649                 int namelen = alt->name - alt->base;
 650                 memcpy(namebuf, alt->base, namelen);
 651                 namebuf[namelen - 1] = 0;
 652                 fsck_object_dir(namebuf);
 653         }
 654
 655         if (check_full) {
 656                 struct packed_git *p;
 657                 uint32_t total = 0, count = 0;
 658                 struct progress *progress = NULL;
 659
 660                 prepare_packed_git();
 661
 662                 if (show_progress) {
 663                         for (p = packed_git; p; p = p->next) {
 664                                 if (open_pack_index(p))
 665                                         continue;
 666                                 total += p->num_objects;
 667                         }
 668
 669                         progress = start_progress(_("Checking objects"), total);
 670                 }
 671                 for (p = packed_git; p; p = p->next) {
 672                         /* verify gives error messages itself */
 673                         if (verify_pack(p, fsck_obj_buffer,
 674                                         progress, count))
 675                                 errors_found |= ERROR_PACK;
 676                         count += p->num_objects;
 677                 }
 678                 stop_progress(&progress);
 679         }
 680
 681         heads = 0;
 682         for (i = 0; i < argc; i++) {
 683                 const char *arg = argv[i];
 684                 unsigned char sha1[20];
 685                 if (!get_sha1(arg, sha1)) {
 686                         struct object *obj = lookup_object(sha1);
 687
 688                         /* Error is printed by lookup_object(). */
 689                         if (!obj)
 690                                 continue;
 691
 692                         obj->used = 1;
 693                         mark_object_reachable(obj);
 694                         heads++;
 695                         continue;
 696                 }
 697                 error("invalid parameter: expected sha1, got '%s'", arg);
 698         }
 699
 700         /*
 701          * If we've not been given any explicit head information, do the
 702          * default ones from .git/refs. We also consider the index file
 703          * in this case (ie this implies --cache).
 704          */
 705         if (!heads) {
 706                 get_default_heads();
 707                 keep_cache_objects = 1;
 708         }
 709
 710         if (keep_cache_objects) {
 711                 read_cache();
 712                 for (i = 0; i < active_nr; i++) {
 713                         unsigned int mode;
 714                         struct blob *blob;
 715                         struct object *obj;
 716
 717                         mode = active_cache[i]->ce_mode;
 718                         if (S_ISGITLINK(mode))
 719                                 continue;
 720                         blob = lookup_blob(active_cache[i]->sha1);
 721                         if (!blob)
 722                                 continue;
 723                         obj = &blob->object;
 724                         obj->used = 1;
 725                         mark_object_reachable(obj);
 726                 }
 727                 if (active_cache_tree)
 728                         fsck_cache_tree(active_cache_tree);
 729         }
 730
 731         check_connectivity();
 732         return errors_found;
 733 }