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
  16 #define REACHABLE 0x0001
  17 #define SEEN      0x0002
  18
  19 static int show_root;
  20 static int show_tags;
  21 static int show_unreachable;
  22 static int include_reflogs = 1;
  23 static int check_full = 1;
  24 static int check_strict;
  25 static int keep_cache_objects;
  26 static unsigned char head_sha1[20];
  27 static const char *head_points_at;
  28 static int errors_found;
  29 static int write_lost_and_found;
  30 static int verbose;
  31 static int show_progress = -1;
  32 #define ERROR_OBJECT 01
  33 #define ERROR_REACHABLE 02
  34 #define ERROR_PACK 04
  35
  36 #ifdef NO_D_INO_IN_DIRENT
  37 #define SORT_DIRENT 0
  38 #define DIRENT_SORT_HINT(de) 0
  39 #else
  40 #define SORT_DIRENT 1
  41 #define DIRENT_SORT_HINT(de) ((de)->d_ino)
  42 #endif
  43
  44 static void objreport(struct object *obj, const char *severity,
  45                       const char *err, va_list params)
  46 {
  47         fprintf(stderr, "%s in %s %s: ",
  48                 severity, typename(obj->type), sha1_to_hex(obj->sha1));
  49         vfprintf(stderr, err, params);
  50         fputs("\n", stderr);
  51 }
  52
  53 __attribute__((format (printf, 2, 3)))
  54 static int objerror(struct object *obj, const char *err, ...)
  55 {
  56         va_list params;
  57         va_start(params, err);
  58         errors_found |= ERROR_OBJECT;
  59         objreport(obj, "error", err, params);
  60         va_end(params);
  61         return -1;
  62 }
  63
  64 __attribute__((format (printf, 3, 4)))
  65 static int fsck_error_func(struct object *obj, int type, const char *err, ...)
  66 {
  67         va_list params;
  68         va_start(params, err);
  69         objreport(obj, (type == FSCK_WARN) ? "warning" : "error", err, params);
  70         va_end(params);
  71         return (type == FSCK_WARN) ? 0 : 1;
  72 }
  73
  74 static struct object_array pending;
  75
  76 static int mark_object(struct object *obj, int type, void *data)
  77 {
  78         struct object *parent = data;
  79
  80         /*
  81          * The only case data is NULL or type is OBJ_ANY is when
  82          * mark_object_reachable() calls us.  All the callers of
  83          * that function has non-NULL obj hence ...
  84          */
  85         if (!obj) {
  86                 /* ... these references to parent->fld are safe here */
  87                 printf("broken link from %7s %s\n",
  88                            typename(parent->type), sha1_to_hex(parent->sha1));
  89                 printf("broken link from %7s %s\n",
  90                            (type == OBJ_ANY ? "unknown" : typename(type)), "unknown");
  91                 errors_found |= ERROR_REACHABLE;
  92                 return 1;
  93         }
  94
  95         if (type != OBJ_ANY && obj->type != type)
  96                 /* ... and the reference to parent is safe here */
  97                 objerror(parent, "wrong object type in link");
  98
  99         if (obj->flags & REACHABLE)
 100                 return 0;
 101         obj->flags |= REACHABLE;
 102         if (!obj->parsed) {
 103                 if (parent && !has_sha1_file(obj->sha1)) {
 104                         printf("broken link from %7s %s\n",
 105                                  typename(parent->type), sha1_to_hex(parent->sha1));
 106                         printf("              to %7s %s\n",
 107                                  typename(obj->type), sha1_to_hex(obj->sha1));
 108                         errors_found |= ERROR_REACHABLE;
 109                 }
 110                 return 1;
 111         }
 112
 113         add_object_array(obj, (void *) parent, &pending);
 114         return 0;
 115 }
 116
 117 static void mark_object_reachable(struct object *obj)
 118 {
 119         mark_object(obj, OBJ_ANY, NULL);
 120 }
 121
 122 static int traverse_one_object(struct object *obj)
 123 {
 124         int result;
 125         struct tree *tree = NULL;
 126
 127         if (obj->type == OBJ_TREE) {
 128                 obj->parsed = 0;
 129                 tree = (struct tree *)obj;
 130                 if (parse_tree(tree) < 0)
 131                         return 1; /* error already displayed */
 132         }
 133         result = fsck_walk(obj, mark_object, obj);
 134         if (tree) {
 135                 free(tree->buffer);
 136                 tree->buffer = NULL;
 137         }
 138         return result;
 139 }
 140
 141 static int traverse_reachable(void)
 142 {
 143         struct progress *progress = NULL;
 144         unsigned int nr = 0;
 145         int result = 0;
 146         if (show_progress)
 147                 progress = start_progress_delay("Checking connectivity", 0, 0, 2);
 148         while (pending.nr) {
 149                 struct object_array_entry *entry;
 150                 struct object *obj;
 151
 152                 entry = pending.objects + --pending.nr;
 153                 obj = entry->item;
 154                 result |= traverse_one_object(obj);
 155                 display_progress(progress, ++nr);
 156         }
 157         stop_progress(&progress);
 158         return !!result;
 159 }
 160
 161 static int mark_used(struct object *obj, int type, void *data)
 162 {
 163         if (!obj)
 164                 return 1;
 165         obj->used = 1;
 166         return 0;
 167 }
 168
 169 /*
 170  * Check a single reachable object
 171  */
 172 static void check_reachable_object(struct object *obj)
 173 {
 174         /*
 175          * We obviously want the object to be parsed,
 176          * except if it was in a pack-file and we didn't
 177          * do a full fsck
 178          */
 179         if (!obj->parsed) {
 180                 if (has_sha1_pack(obj->sha1))
 181                         return; /* it is in pack - forget about it */
 182                 printf("missing %s %s\n", typename(obj->type), sha1_to_hex(obj->sha1));
 183                 errors_found |= ERROR_REACHABLE;
 184                 return;
 185         }
 186 }
 187
 188 /*
 189  * Check a single unreachable object
 190  */
 191 static void check_unreachable_object(struct object *obj)
 192 {
 193         /*
 194          * Missing unreachable object? Ignore it. It's not like
 195          * we miss it (since it can't be reached), nor do we want
 196          * to complain about it being unreachable (since it does
 197          * not exist).
 198          */
 199         if (!obj->parsed)
 200                 return;
 201
 202         /*
 203          * Unreachable object that exists? Show it if asked to,
 204          * since this is something that is prunable.
 205          */
 206         if (show_unreachable) {
 207                 printf("unreachable %s %s\n", typename(obj->type), sha1_to_hex(obj->sha1));
 208                 return;
 209         }
 210
 211         /*
 212          * "!used" means that nothing at all points to it, including
 213          * other unreachable objects. In other words, it's the "tip"
 214          * of some set of unreachable objects, usually a commit that
 215          * got dropped.
 216          *
 217          * Such starting points are more interesting than some random
 218          * set of unreachable objects, so we show them even if the user
 219          * hasn't asked for _all_ unreachable objects. If you have
 220          * deleted a branch by mistake, this is a prime candidate to
 221          * start looking at, for example.
 222          */
 223         if (!obj->used) {
 224                 printf("dangling %s %s\n", typename(obj->type),
 225                        sha1_to_hex(obj->sha1));
 226                 if (write_lost_and_found) {
 227                         char *filename = git_path("lost-found/%s/%s",
 228                                 obj->type == OBJ_COMMIT ? "commit" : "other",
 229                                 sha1_to_hex(obj->sha1));
 230                         FILE *f;
 231
 232                         if (safe_create_leading_directories(filename)) {
 233                                 error("Could not create lost-found");
 234                                 return;
 235                         }
 236                         if (!(f = fopen(filename, "w")))
 237                                 die_errno("Could not open '%s'", filename);
 238                         if (obj->type == OBJ_BLOB) {
 239                                 enum object_type type;
 240                                 unsigned long size;
 241                                 char *buf = read_sha1_file(obj->sha1,
 242                                                 &type, &size);
 243                                 if (buf && fwrite(buf, 1, size, f) != size)
 244                                         die_errno("Could not write '%s'", filename);
 245                                 free(buf);
 246                         } else
 247                                 fprintf(f, "%s\n", sha1_to_hex(obj->sha1));
 248                         if (fclose(f))
 249                                 die_errno("Could not finish '%s'",
 250                                           filename);
 251                 }
 252                 return;
 253         }
 254
 255         /*
 256          * Otherwise? It's there, it's unreachable, and some other unreachable
 257          * object points to it. Ignore it - it's not interesting, and we showed
 258          * all the interesting cases above.
 259          */
 260 }
 261
 262 static void check_object(struct object *obj)
 263 {
 264         if (verbose)
 265                 fprintf(stderr, "Checking %s\n", sha1_to_hex(obj->sha1));
 266
 267         if (obj->flags & REACHABLE)
 268                 check_reachable_object(obj);
 269         else
 270                 check_unreachable_object(obj);
 271 }
 272
 273 static void check_connectivity(void)
 274 {
 275         int i, max;
 276
 277         /* Traverse the pending reachable objects */
 278         traverse_reachable();
 279
 280         /* Look up all the requirements, warn about missing objects.. */
 281         max = get_max_object_index();
 282         if (verbose)
 283                 fprintf(stderr, "Checking connectivity (%d objects)\n", max);
 284
 285         for (i = 0; i < max; i++) {
 286                 struct object *obj = get_indexed_object(i);
 287
 288                 if (obj)
 289                         check_object(obj);
 290         }
 291 }
 292
 293 static int fsck_obj(struct object *obj)
 294 {
 295         if (obj->flags & SEEN)
 296                 return 0;
 297         obj->flags |= SEEN;
 298
 299         if (verbose)
 300                 fprintf(stderr, "Checking %s %s\n",
 301                         typename(obj->type), sha1_to_hex(obj->sha1));
 302
 303         if (fsck_walk(obj, mark_used, NULL))
 304                 objerror(obj, "broken links");
 305         if (fsck_object(obj, check_strict, fsck_error_func))
 306                 return -1;
 307
 308         if (obj->type == OBJ_TREE) {
 309                 struct tree *item = (struct tree *) obj;
 310
 311                 free(item->buffer);
 312                 item->buffer = NULL;
 313         }
 314
 315         if (obj->type == OBJ_COMMIT) {
 316                 struct commit *commit = (struct commit *) obj;
 317
 318                 free(commit->buffer);
 319                 commit->buffer = NULL;
 320
 321                 if (!commit->parents && show_root)
 322                         printf("root %s\n", sha1_to_hex(commit->object.sha1));
 323         }
 324
 325         if (obj->type == OBJ_TAG) {
 326                 struct tag *tag = (struct tag *) obj;
 327
 328                 if (show_tags && tag->tagged) {
 329                         printf("tagged %s %s", typename(tag->tagged->type), sha1_to_hex(tag->tagged->sha1));
 330                         printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1));
 331                 }
 332         }
 333
 334         return 0;
 335 }
 336
 337 static int fsck_sha1(const unsigned char *sha1)
 338 {
 339         struct object *obj = parse_object(sha1);
 340         if (!obj) {
 341                 errors_found |= ERROR_OBJECT;
 342                 return error("%s: object corrupt or missing",
 343                              sha1_to_hex(sha1));
 344         }
 345         return fsck_obj(obj);
 346 }
 347
 348 static int fsck_obj_buffer(const unsigned char *sha1, enum object_type type,
 349                            unsigned long size, void *buffer, int *eaten)
 350 {
 351         struct object *obj;
 352         obj = parse_object_buffer(sha1, type, size, buffer, eaten);
 353         if (!obj) {
 354                 errors_found |= ERROR_OBJECT;
 355                 return error("%s: object corrupt or missing", sha1_to_hex(sha1));
 356         }
 357         return fsck_obj(obj);
 358 }
 359
 360 /*
 361  * This is the sorting chunk size: make it reasonably
 362  * big so that we can sort well..
 363  */
 364 #define MAX_SHA1_ENTRIES (1024)
 365
 366 struct sha1_entry {
 367         unsigned long ino;
 368         unsigned char sha1[20];
 369 };
 370
 371 static struct {
 372         unsigned long nr;
 373         struct sha1_entry *entry[MAX_SHA1_ENTRIES];
 374 } sha1_list;
 375
 376 static int ino_compare(const void *_a, const void *_b)
 377 {
 378         const struct sha1_entry *a = _a, *b = _b;
 379         unsigned long ino1 = a->ino, ino2 = b->ino;
 380         return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
 381 }
 382
 383 static void fsck_sha1_list(void)
 384 {
 385         int i, nr = sha1_list.nr;
 386
 387         if (SORT_DIRENT)
 388                 qsort(sha1_list.entry, nr,
 389                       sizeof(struct sha1_entry *), ino_compare);
 390         for (i = 0; i < nr; i++) {
 391                 struct sha1_entry *entry = sha1_list.entry[i];
 392                 unsigned char *sha1 = entry->sha1;
 393
 394                 sha1_list.entry[i] = NULL;
 395                 fsck_sha1(sha1);
 396                 free(entry);
 397         }
 398         sha1_list.nr = 0;
 399 }
 400
 401 static void add_sha1_list(unsigned char *sha1, unsigned long ino)
 402 {
 403         struct sha1_entry *entry = xmalloc(sizeof(*entry));
 404         int nr;
 405
 406         entry->ino = ino;
 407         hashcpy(entry->sha1, sha1);
 408         nr = sha1_list.nr;
 409         if (nr == MAX_SHA1_ENTRIES) {
 410                 fsck_sha1_list();
 411                 nr = 0;
 412         }
 413         sha1_list.entry[nr] = entry;
 414         sha1_list.nr = ++nr;
 415 }
 416
 417 static inline int is_loose_object_file(struct dirent *de,
 418                                        char *name, unsigned char *sha1)
 419 {
 420         if (strlen(de->d_name) != 38)
 421                 return 0;
 422         memcpy(name + 2, de->d_name, 39);
 423         return !get_sha1_hex(name, sha1);
 424 }
 425
 426 static void fsck_dir(int i, char *path)
 427 {
 428         DIR *dir = opendir(path);
 429         struct dirent *de;
 430         char name[100];
 431
 432         if (!dir)
 433                 return;
 434
 435         if (verbose)
 436                 fprintf(stderr, "Checking directory %s\n", path);
 437
 438         sprintf(name, "%02x", i);
 439         while ((de = readdir(dir)) != NULL) {
 440                 unsigned char sha1[20];
 441
 442                 if (is_dot_or_dotdot(de->d_name))
 443                         continue;
 444                 if (is_loose_object_file(de, name, sha1)) {
 445                         add_sha1_list(sha1, DIRENT_SORT_HINT(de));
 446                         continue;
 447                 }
 448                 if (!prefixcmp(de->d_name, "tmp_obj_"))
 449                         continue;
 450                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 451         }
 452         closedir(dir);
 453 }
 454
 455 static int default_refs;
 456
 457 static int fsck_handle_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 458                 const char *email, unsigned long timestamp, int tz,
 459                 const char *message, void *cb_data)
 460 {
 461         struct object *obj;
 462
 463         if (verbose)
 464                 fprintf(stderr, "Checking reflog %s->%s\n",
 465                         sha1_to_hex(osha1), sha1_to_hex(nsha1));
 466
 467         if (!is_null_sha1(osha1)) {
 468                 obj = lookup_object(osha1);
 469                 if (obj) {
 470                         obj->used = 1;
 471                         mark_object_reachable(obj);
 472                 }
 473         }
 474         obj = lookup_object(nsha1);
 475         if (obj) {
 476                 obj->used = 1;
 477                 mark_object_reachable(obj);
 478         }
 479         return 0;
 480 }
 481
 482 static int fsck_handle_reflog(const char *logname, const unsigned char *sha1, int flag, void *cb_data)
 483 {
 484         for_each_reflog_ent(logname, fsck_handle_reflog_ent, NULL);
 485         return 0;
 486 }
 487
 488 static int is_branch(const char *refname)
 489 {
 490         return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
 491 }
 492
 493 static int fsck_handle_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 494 {
 495         struct object *obj;
 496
 497         obj = parse_object(sha1);
 498         if (!obj) {
 499                 error("%s: invalid sha1 pointer %s", refname, sha1_to_hex(sha1));
 500                 /* We'll continue with the rest despite the error.. */
 501                 return 0;
 502         }
 503         if (obj->type != OBJ_COMMIT && is_branch(refname))
 504                 error("%s: not a commit", refname);
 505         default_refs++;
 506         obj->used = 1;
 507         mark_object_reachable(obj);
 508
 509         return 0;
 510 }
 511
 512 static void get_default_heads(void)
 513 {
 514         if (head_points_at && !is_null_sha1(head_sha1))
 515                 fsck_handle_ref("HEAD", head_sha1, 0, NULL);
 516         for_each_ref(fsck_handle_ref, NULL);
 517         if (include_reflogs)
 518                 for_each_reflog(fsck_handle_reflog, NULL);
 519
 520         /*
 521          * Not having any default heads isn't really fatal, but
 522          * it does mean that "--unreachable" no longer makes any
 523          * sense (since in this case everything will obviously
 524          * be unreachable by definition.
 525          *
 526          * Showing dangling objects is valid, though (as those
 527          * dangling objects are likely lost heads).
 528          *
 529          * So we just print a warning about it, and clear the
 530          * "show_unreachable" flag.
 531          */
 532         if (!default_refs) {
 533                 fprintf(stderr, "notice: No default references\n");
 534                 show_unreachable = 0;
 535         }
 536 }
 537
 538 static void fsck_object_dir(const char *path)
 539 {
 540         int i;
 541         struct progress *progress = NULL;
 542
 543         if (verbose)
 544                 fprintf(stderr, "Checking object directory\n");
 545
 546         if (show_progress)
 547                 progress = start_progress("Checking object directories", 256);
 548         for (i = 0; i < 256; i++) {
 549                 static char dir[4096];
 550                 sprintf(dir, "%s/%02x", path, i);
 551                 fsck_dir(i, dir);
 552                 display_progress(progress, i+1);
 553         }
 554         stop_progress(&progress);
 555         fsck_sha1_list();
 556 }
 557
 558 static int fsck_head_link(void)
 559 {
 560         int flag;
 561         int null_is_error = 0;
 562
 563         if (verbose)
 564                 fprintf(stderr, "Checking HEAD link\n");
 565
 566         head_points_at = resolve_ref_unsafe("HEAD", head_sha1, 0, &flag);
 567         if (!head_points_at)
 568                 return error("Invalid HEAD");
 569         if (!strcmp(head_points_at, "HEAD"))
 570                 /* detached HEAD */
 571                 null_is_error = 1;
 572         else if (prefixcmp(head_points_at, "refs/heads/"))
 573                 return error("HEAD points to something strange (%s)",
 574                              head_points_at);
 575         if (is_null_sha1(head_sha1)) {
 576                 if (null_is_error)
 577                         return error("HEAD: detached HEAD points at nothing");
 578                 fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
 579                         head_points_at + 11);
 580         }
 581         return 0;
 582 }
 583
 584 static int fsck_cache_tree(struct cache_tree *it)
 585 {
 586         int i;
 587         int err = 0;
 588
 589         if (verbose)
 590                 fprintf(stderr, "Checking cache tree\n");
 591
 592         if (0 <= it->entry_count) {
 593                 struct object *obj = parse_object(it->sha1);
 594                 if (!obj) {
 595                         error("%s: invalid sha1 pointer in cache-tree",
 596                               sha1_to_hex(it->sha1));
 597                         return 1;
 598                 }
 599                 obj->used = 1;
 600                 mark_object_reachable(obj);
 601                 if (obj->type != OBJ_TREE)
 602                         err |= objerror(obj, "non-tree in cache-tree");
 603         }
 604         for (i = 0; i < it->subtree_nr; i++)
 605                 err |= fsck_cache_tree(it->down[i]->cache_tree);
 606         return err;
 607 }
 608
 609 static char const * const fsck_usage[] = {
 610         "git fsck [options] [<object>...]",
 611         NULL
 612 };
 613
 614 static struct option fsck_opts[] = {
 615         OPT__VERBOSE(&verbose, "be verbose"),
 616         OPT_BOOLEAN(0, "unreachable", &show_unreachable, "show unreachable objects"),
 617         OPT_BOOLEAN(0, "tags", &show_tags, "report tags"),
 618         OPT_BOOLEAN(0, "root", &show_root, "report root nodes"),
 619         OPT_BOOLEAN(0, "cache", &keep_cache_objects, "make index objects head nodes"),
 620         OPT_BOOLEAN(0, "reflogs", &include_reflogs, "make reflogs head nodes (default)"),
 621         OPT_BOOLEAN(0, "full", &check_full, "also consider packs and alternate objects"),
 622         OPT_BOOLEAN(0, "strict", &check_strict, "enable more strict checking"),
 623         OPT_BOOLEAN(0, "lost-found", &write_lost_and_found,
 624                                 "write dangling objects in .git/lost-found"),
 625         OPT_BOOL(0, "progress", &show_progress, "show progress"),
 626         OPT_END(),
 627 };
 628
 629 int cmd_fsck(int argc, const char **argv, const char *prefix)
 630 {
 631         int i, heads;
 632         struct alternate_object_database *alt;
 633
 634         errors_found = 0;
 635         read_replace_refs = 0;
 636
 637         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 638
 639         if (show_progress == -1)
 640                 show_progress = isatty(2);
 641         if (verbose)
 642                 show_progress = 0;
 643
 644         if (write_lost_and_found) {
 645                 check_full = 1;
 646                 include_reflogs = 0;
 647         }
 648
 649         fsck_head_link();
 650         fsck_object_dir(get_object_directory());
 651
 652         prepare_alt_odb();
 653         for (alt = alt_odb_list; alt; alt = alt->next) {
 654                 char namebuf[PATH_MAX];
 655                 int namelen = alt->name - alt->base;
 656                 memcpy(namebuf, alt->base, namelen);
 657                 namebuf[namelen - 1] = 0;
 658                 fsck_object_dir(namebuf);
 659         }
 660
 661         if (check_full) {
 662                 struct packed_git *p;
 663                 uint32_t total = 0, count = 0;
 664                 struct progress *progress = NULL;
 665
 666                 prepare_packed_git();
 667
 668                 if (show_progress) {
 669                         for (p = packed_git; p; p = p->next) {
 670                                 if (open_pack_index(p))
 671                                         continue;
 672                                 total += p->num_objects;
 673                         }
 674
 675                         progress = start_progress("Checking objects", total);
 676                 }
 677                 for (p = packed_git; p; p = p->next) {
 678                         /* verify gives error messages itself */
 679                         if (verify_pack(p, fsck_obj_buffer,
 680                                         progress, count))
 681                                 errors_found |= ERROR_PACK;
 682                         count += p->num_objects;
 683                 }
 684                 stop_progress(&progress);
 685         }
 686
 687         heads = 0;
 688         for (i = 0; i < argc; i++) {
 689                 const char *arg = argv[i];
 690                 unsigned char sha1[20];
 691                 if (!get_sha1(arg, sha1)) {
 692                         struct object *obj = lookup_object(sha1);
 693
 694                         /* Error is printed by lookup_object(). */
 695                         if (!obj)
 696                                 continue;
 697
 698                         obj->used = 1;
 699                         mark_object_reachable(obj);
 700                         heads++;
 701                         continue;
 702                 }
 703                 error("invalid parameter: expected sha1, got '%s'", arg);
 704         }
 705
 706         /*
 707          * If we've not been given any explicit head information, do the
 708          * default ones from .git/refs. We also consider the index file
 709          * in this case (ie this implies --cache).
 710          */
 711         if (!heads) {
 712                 get_default_heads();
 713                 keep_cache_objects = 1;
 714         }
 715
 716         if (keep_cache_objects) {
 717                 read_cache();
 718                 for (i = 0; i < active_nr; i++) {
 719                         unsigned int mode;
 720                         struct blob *blob;
 721                         struct object *obj;
 722
 723                         mode = active_cache[i]->ce_mode;
 724                         if (S_ISGITLINK(mode))
 725                                 continue;
 726                         blob = lookup_blob(active_cache[i]->sha1);
 727                         if (!blob)
 728                                 continue;
 729                         obj = &blob->object;
 730                         obj->used = 1;
 731                         mark_object_reachable(obj);
 732                 }
 733                 if (active_cache_tree)
 734                         fsck_cache_tree(active_cache_tree);
 735         }
 736
 737         check_connectivity();
 738         return errors_found;
 739 }