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 connectivity_only;
  27 static int check_strict;
  28 static int keep_cache_objects;
  29 static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
  30 static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
  31 static struct object_id head_oid;
  32 static const char *head_points_at;
  33 static int errors_found;
  34 static int write_lost_and_found;
  35 static int verbose;
  36 static int show_progress = -1;
  37 static int show_dangling = 1;
  38 #define ERROR_OBJECT 01
  39 #define ERROR_REACHABLE 02
  40 #define ERROR_PACK 04
  41
  42 #ifdef NO_D_INO_IN_DIRENT
  43 #define SORT_DIRENT 0
  44 #define DIRENT_SORT_HINT(de) 0
  45 #else
  46 #define SORT_DIRENT 1
  47 #define DIRENT_SORT_HINT(de) ((de)->d_ino)
  48 #endif
  49
  50 static int fsck_config(const char *var, const char *value, void *cb)
  51 {
  52         if (strcmp(var, "fsck.skiplist") == 0) {
  53                 const char *path;
  54                 struct strbuf sb = STRBUF_INIT;
  55
  56                 if (git_config_pathname(&path, var, value))
  57                         return 1;
  58                 strbuf_addf(&sb, "skiplist=%s", path);
  59                 free((char *)path);
  60                 fsck_set_msg_types(&fsck_obj_options, sb.buf);
  61                 strbuf_release(&sb);
  62                 return 0;
  63         }
  64
  65         if (skip_prefix(var, "fsck.", &var)) {
  66                 fsck_set_msg_type(&fsck_obj_options, var, value);
  67                 return 0;
  68         }
  69
  70         return git_default_config(var, value, cb);
  71 }
  72
  73 static void objreport(struct object *obj, const char *msg_type,
  74                         const char *err)
  75 {
  76         fprintf(stderr, "%s in %s %s: %s\n",
  77                 msg_type, typename(obj->type), sha1_to_hex(obj->sha1), err);
  78 }
  79
  80 static int objerror(struct object *obj, const char *err)
  81 {
  82         errors_found |= ERROR_OBJECT;
  83         objreport(obj, "error", err);
  84         return -1;
  85 }
  86
  87 static int fsck_error_func(struct object *obj, int type, const char *message)
  88 {
  89         objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message);
  90         return (type == FSCK_WARN) ? 0 : 1;
  91 }
  92
  93 static struct object_array pending;
  94
  95 static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
  96 {
  97         struct object *parent = data;
  98
  99         /*
 100          * The only case data is NULL or type is OBJ_ANY is when
 101          * mark_object_reachable() calls us.  All the callers of
 102          * that function has non-NULL obj hence ...
 103          */
 104         if (!obj) {
 105                 /* ... these references to parent->fld are safe here */
 106                 printf("broken link from %7s %s\n",
 107                            typename(parent->type), sha1_to_hex(parent->sha1));
 108                 printf("broken link from %7s %s\n",
 109                            (type == OBJ_ANY ? "unknown" : typename(type)), "unknown");
 110                 errors_found |= ERROR_REACHABLE;
 111                 return 1;
 112         }
 113
 114         if (type != OBJ_ANY && obj->type != type)
 115                 /* ... and the reference to parent is safe here */
 116                 objerror(parent, "wrong object type in link");
 117
 118         if (obj->flags & REACHABLE)
 119                 return 0;
 120         obj->flags |= REACHABLE;
 121         if (!(obj->flags & HAS_OBJ)) {
 122                 if (parent && !has_sha1_file(obj->sha1)) {
 123                         printf("broken link from %7s %s\n",
 124                                  typename(parent->type), sha1_to_hex(parent->sha1));
 125                         printf("              to %7s %s\n",
 126                                  typename(obj->type), sha1_to_hex(obj->sha1));
 127                         errors_found |= ERROR_REACHABLE;
 128                 }
 129                 return 1;
 130         }
 131
 132         add_object_array(obj, NULL, &pending);
 133         return 0;
 134 }
 135
 136 static void mark_object_reachable(struct object *obj)
 137 {
 138         mark_object(obj, OBJ_ANY, NULL, NULL);
 139 }
 140
 141 static int traverse_one_object(struct object *obj)
 142 {
 143         int result;
 144         struct tree *tree = NULL;
 145
 146         if (obj->type == OBJ_TREE) {
 147                 tree = (struct tree *)obj;
 148                 if (parse_tree(tree) < 0)
 149                         return 1; /* error already displayed */
 150         }
 151         result = fsck_walk(obj, obj, &fsck_walk_options);
 152         if (tree)
 153                 free_tree_buffer(tree);
 154         return result;
 155 }
 156
 157 static int traverse_reachable(void)
 158 {
 159         struct progress *progress = NULL;
 160         unsigned int nr = 0;
 161         int result = 0;
 162         if (show_progress)
 163                 progress = start_progress_delay(_("Checking connectivity"), 0, 0, 2);
 164         while (pending.nr) {
 165                 struct object_array_entry *entry;
 166                 struct object *obj;
 167
 168                 entry = pending.objects + --pending.nr;
 169                 obj = entry->item;
 170                 result |= traverse_one_object(obj);
 171                 display_progress(progress, ++nr);
 172         }
 173         stop_progress(&progress);
 174         return !!result;
 175 }
 176
 177 static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
 178 {
 179         if (!obj)
 180                 return 1;
 181         obj->used = 1;
 182         return 0;
 183 }
 184
 185 /*
 186  * Check a single reachable object
 187  */
 188 static void check_reachable_object(struct object *obj)
 189 {
 190         /*
 191          * We obviously want the object to be parsed,
 192          * except if it was in a pack-file and we didn't
 193          * do a full fsck
 194          */
 195         if (!(obj->flags & HAS_OBJ)) {
 196                 if (has_sha1_pack(obj->sha1))
 197                         return; /* it is in pack - forget about it */
 198                 if (connectivity_only && has_sha1_file(obj->sha1))
 199                         return;
 200                 printf("missing %s %s\n", typename(obj->type), sha1_to_hex(obj->sha1));
 201                 errors_found |= ERROR_REACHABLE;
 202                 return;
 203         }
 204 }
 205
 206 /*
 207  * Check a single unreachable object
 208  */
 209 static void check_unreachable_object(struct object *obj)
 210 {
 211         /*
 212          * Missing unreachable object? Ignore it. It's not like
 213          * we miss it (since it can't be reached), nor do we want
 214          * to complain about it being unreachable (since it does
 215          * not exist).
 216          */
 217         if (!obj->parsed)
 218                 return;
 219
 220         /*
 221          * Unreachable object that exists? Show it if asked to,
 222          * since this is something that is prunable.
 223          */
 224         if (show_unreachable) {
 225                 printf("unreachable %s %s\n", typename(obj->type), sha1_to_hex(obj->sha1));
 226                 return;
 227         }
 228
 229         /*
 230          * "!used" means that nothing at all points to it, including
 231          * other unreachable objects. In other words, it's the "tip"
 232          * of some set of unreachable objects, usually a commit that
 233          * got dropped.
 234          *
 235          * Such starting points are more interesting than some random
 236          * set of unreachable objects, so we show them even if the user
 237          * hasn't asked for _all_ unreachable objects. If you have
 238          * deleted a branch by mistake, this is a prime candidate to
 239          * start looking at, for example.
 240          */
 241         if (!obj->used) {
 242                 if (show_dangling)
 243                         printf("dangling %s %s\n", typename(obj->type),
 244                                sha1_to_hex(obj->sha1));
 245                 if (write_lost_and_found) {
 246                         const char *filename = git_path("lost-found/%s/%s",
 247                                 obj->type == OBJ_COMMIT ? "commit" : "other",
 248                                 sha1_to_hex(obj->sha1));
 249                         FILE *f;
 250
 251                         if (safe_create_leading_directories_const(filename)) {
 252                                 error("Could not create lost-found");
 253                                 return;
 254                         }
 255                         if (!(f = fopen(filename, "w")))
 256                                 die_errno("Could not open '%s'", filename);
 257                         if (obj->type == OBJ_BLOB) {
 258                                 if (stream_blob_to_fd(fileno(f), obj->sha1, NULL, 1))
 259                                         die_errno("Could not write '%s'", filename);
 260                         } else
 261                                 fprintf(f, "%s\n", sha1_to_hex(obj->sha1));
 262                         if (fclose(f))
 263                                 die_errno("Could not finish '%s'",
 264                                           filename);
 265                 }
 266                 return;
 267         }
 268
 269         /*
 270          * Otherwise? It's there, it's unreachable, and some other unreachable
 271          * object points to it. Ignore it - it's not interesting, and we showed
 272          * all the interesting cases above.
 273          */
 274 }
 275
 276 static void check_object(struct object *obj)
 277 {
 278         if (verbose)
 279                 fprintf(stderr, "Checking %s\n", sha1_to_hex(obj->sha1));
 280
 281         if (obj->flags & REACHABLE)
 282                 check_reachable_object(obj);
 283         else
 284                 check_unreachable_object(obj);
 285 }
 286
 287 static void check_connectivity(void)
 288 {
 289         int i, max;
 290
 291         /* Traverse the pending reachable objects */
 292         traverse_reachable();
 293
 294         /* Look up all the requirements, warn about missing objects.. */
 295         max = get_max_object_index();
 296         if (verbose)
 297                 fprintf(stderr, "Checking connectivity (%d objects)\n", max);
 298
 299         for (i = 0; i < max; i++) {
 300                 struct object *obj = get_indexed_object(i);
 301
 302                 if (obj)
 303                         check_object(obj);
 304         }
 305 }
 306
 307 static int fsck_obj(struct object *obj)
 308 {
 309         if (obj->flags & SEEN)
 310                 return 0;
 311         obj->flags |= SEEN;
 312
 313         if (verbose)
 314                 fprintf(stderr, "Checking %s %s\n",
 315                         typename(obj->type), sha1_to_hex(obj->sha1));
 316
 317         if (fsck_walk(obj, NULL, &fsck_obj_options))
 318                 objerror(obj, "broken links");
 319         if (fsck_object(obj, NULL, 0, &fsck_obj_options))
 320                 return -1;
 321
 322         if (obj->type == OBJ_TREE) {
 323                 struct tree *item = (struct tree *) obj;
 324
 325                 free_tree_buffer(item);
 326         }
 327
 328         if (obj->type == OBJ_COMMIT) {
 329                 struct commit *commit = (struct commit *) obj;
 330
 331                 free_commit_buffer(commit);
 332
 333                 if (!commit->parents && show_root)
 334                         printf("root %s\n", sha1_to_hex(commit->object.sha1));
 335         }
 336
 337         if (obj->type == OBJ_TAG) {
 338                 struct tag *tag = (struct tag *) obj;
 339
 340                 if (show_tags && tag->tagged) {
 341                         printf("tagged %s %s", typename(tag->tagged->type), sha1_to_hex(tag->tagged->sha1));
 342                         printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1));
 343                 }
 344         }
 345
 346         return 0;
 347 }
 348
 349 static int fsck_sha1(const unsigned char *sha1)
 350 {
 351         struct object *obj = parse_object(sha1);
 352         if (!obj) {
 353                 errors_found |= ERROR_OBJECT;
 354                 return error("%s: object corrupt or missing",
 355                              sha1_to_hex(sha1));
 356         }
 357         obj->flags |= HAS_OBJ;
 358         return fsck_obj(obj);
 359 }
 360
 361 static int fsck_obj_buffer(const unsigned char *sha1, enum object_type type,
 362                            unsigned long size, void *buffer, int *eaten)
 363 {
 364         struct object *obj;
 365         obj = parse_object_buffer(sha1, type, size, buffer, eaten);
 366         if (!obj) {
 367                 errors_found |= ERROR_OBJECT;
 368                 return error("%s: object corrupt or missing", sha1_to_hex(sha1));
 369         }
 370         obj->flags = HAS_OBJ;
 371         return fsck_obj(obj);
 372 }
 373
 374 /*
 375  * This is the sorting chunk size: make it reasonably
 376  * big so that we can sort well..
 377  */
 378 #define MAX_SHA1_ENTRIES (1024)
 379
 380 struct sha1_entry {
 381         unsigned long ino;
 382         unsigned char sha1[20];
 383 };
 384
 385 static struct {
 386         unsigned long nr;
 387         struct sha1_entry *entry[MAX_SHA1_ENTRIES];
 388 } sha1_list;
 389
 390 static int ino_compare(const void *_a, const void *_b)
 391 {
 392         const struct sha1_entry *a = _a, *b = _b;
 393         unsigned long ino1 = a->ino, ino2 = b->ino;
 394         return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
 395 }
 396
 397 static void fsck_sha1_list(void)
 398 {
 399         int i, nr = sha1_list.nr;
 400
 401         if (SORT_DIRENT)
 402                 qsort(sha1_list.entry, nr,
 403                       sizeof(struct sha1_entry *), ino_compare);
 404         for (i = 0; i < nr; i++) {
 405                 struct sha1_entry *entry = sha1_list.entry[i];
 406                 unsigned char *sha1 = entry->sha1;
 407
 408                 sha1_list.entry[i] = NULL;
 409                 if (fsck_sha1(sha1))
 410                         errors_found |= ERROR_OBJECT;
 411                 free(entry);
 412         }
 413         sha1_list.nr = 0;
 414 }
 415
 416 static void add_sha1_list(unsigned char *sha1, unsigned long ino)
 417 {
 418         struct sha1_entry *entry = xmalloc(sizeof(*entry));
 419         int nr;
 420
 421         entry->ino = ino;
 422         hashcpy(entry->sha1, sha1);
 423         nr = sha1_list.nr;
 424         if (nr == MAX_SHA1_ENTRIES) {
 425                 fsck_sha1_list();
 426                 nr = 0;
 427         }
 428         sha1_list.entry[nr] = entry;
 429         sha1_list.nr = ++nr;
 430 }
 431
 432 static inline int is_loose_object_file(struct dirent *de,
 433                                        char *name, unsigned char *sha1)
 434 {
 435         if (strlen(de->d_name) != 38)
 436                 return 0;
 437         memcpy(name + 2, de->d_name, 39);
 438         return !get_sha1_hex(name, sha1);
 439 }
 440
 441 static void fsck_dir(int i, char *path)
 442 {
 443         DIR *dir = opendir(path);
 444         struct dirent *de;
 445         char name[100];
 446
 447         if (!dir)
 448                 return;
 449
 450         if (verbose)
 451                 fprintf(stderr, "Checking directory %s\n", path);
 452
 453         sprintf(name, "%02x", i);
 454         while ((de = readdir(dir)) != NULL) {
 455                 unsigned char sha1[20];
 456
 457                 if (is_dot_or_dotdot(de->d_name))
 458                         continue;
 459                 if (is_loose_object_file(de, name, sha1)) {
 460                         add_sha1_list(sha1, DIRENT_SORT_HINT(de));
 461                         continue;
 462                 }
 463                 if (starts_with(de->d_name, "tmp_obj_"))
 464                         continue;
 465                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 466         }
 467         closedir(dir);
 468 }
 469
 470 static int default_refs;
 471
 472 static void fsck_handle_reflog_sha1(const char *refname, unsigned char *sha1)
 473 {
 474         struct object *obj;
 475
 476         if (!is_null_sha1(sha1)) {
 477                 obj = lookup_object(sha1);
 478                 if (obj) {
 479                         obj->used = 1;
 480                         mark_object_reachable(obj);
 481                 } else {
 482                         error("%s: invalid reflog entry %s", refname, sha1_to_hex(sha1));
 483                         errors_found |= ERROR_REACHABLE;
 484                 }
 485         }
 486 }
 487
 488 static int fsck_handle_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 489                 const char *email, unsigned long timestamp, int tz,
 490                 const char *message, void *cb_data)
 491 {
 492         const char *refname = cb_data;
 493
 494         if (verbose)
 495                 fprintf(stderr, "Checking reflog %s->%s\n",
 496                         sha1_to_hex(osha1), sha1_to_hex(nsha1));
 497
 498         fsck_handle_reflog_sha1(refname, osha1);
 499         fsck_handle_reflog_sha1(refname, nsha1);
 500         return 0;
 501 }
 502
 503 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
 504                               int flag, void *cb_data)
 505 {
 506         for_each_reflog_ent(logname, fsck_handle_reflog_ent, (void *)logname);
 507         return 0;
 508 }
 509
 510 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 511                            int flag, void *cb_data)
 512 {
 513         struct object *obj;
 514
 515         obj = parse_object(oid->hash);
 516         if (!obj) {
 517                 error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
 518                 errors_found |= ERROR_REACHABLE;
 519                 /* We'll continue with the rest despite the error.. */
 520                 return 0;
 521         }
 522         if (obj->type != OBJ_COMMIT && is_branch(refname))
 523                 error("%s: not a commit", refname);
 524         default_refs++;
 525         obj->used = 1;
 526         mark_object_reachable(obj);
 527
 528         return 0;
 529 }
 530
 531 static void get_default_heads(void)
 532 {
 533         if (head_points_at && !is_null_oid(&head_oid))
 534                 fsck_handle_ref("HEAD", &head_oid, 0, NULL);
 535         for_each_rawref(fsck_handle_ref, NULL);
 536         if (include_reflogs)
 537                 for_each_reflog(fsck_handle_reflog, NULL);
 538
 539         /*
 540          * Not having any default heads isn't really fatal, but
 541          * it does mean that "--unreachable" no longer makes any
 542          * sense (since in this case everything will obviously
 543          * be unreachable by definition.
 544          *
 545          * Showing dangling objects is valid, though (as those
 546          * dangling objects are likely lost heads).
 547          *
 548          * So we just print a warning about it, and clear the
 549          * "show_unreachable" flag.
 550          */
 551         if (!default_refs) {
 552                 fprintf(stderr, "notice: No default references\n");
 553                 show_unreachable = 0;
 554         }
 555 }
 556
 557 static void fsck_object_dir(const char *path)
 558 {
 559         int i;
 560         struct progress *progress = NULL;
 561
 562         if (verbose)
 563                 fprintf(stderr, "Checking object directory\n");
 564
 565         if (show_progress)
 566                 progress = start_progress(_("Checking object directories"), 256);
 567         for (i = 0; i < 256; i++) {
 568                 static char dir[4096];
 569                 sprintf(dir, "%s/%02x", path, i);
 570                 fsck_dir(i, dir);
 571                 display_progress(progress, i+1);
 572         }
 573         stop_progress(&progress);
 574         fsck_sha1_list();
 575 }
 576
 577 static int fsck_head_link(void)
 578 {
 579         int flag;
 580         int null_is_error = 0;
 581
 582         if (verbose)
 583                 fprintf(stderr, "Checking HEAD link\n");
 584
 585         head_points_at = resolve_ref_unsafe("HEAD", 0, head_oid.hash, &flag);
 586         if (!head_points_at)
 587                 return error("Invalid HEAD");
 588         if (!strcmp(head_points_at, "HEAD"))
 589                 /* detached HEAD */
 590                 null_is_error = 1;
 591         else if (!starts_with(head_points_at, "refs/heads/"))
 592                 return error("HEAD points to something strange (%s)",
 593                              head_points_at);
 594         if (is_null_oid(&head_oid)) {
 595                 if (null_is_error)
 596                         return error("HEAD: detached HEAD points at nothing");
 597                 fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
 598                         head_points_at + 11);
 599         }
 600         return 0;
 601 }
 602
 603 static int fsck_cache_tree(struct cache_tree *it)
 604 {
 605         int i;
 606         int err = 0;
 607
 608         if (verbose)
 609                 fprintf(stderr, "Checking cache tree\n");
 610
 611         if (0 <= it->entry_count) {
 612                 struct object *obj = parse_object(it->sha1);
 613                 if (!obj) {
 614                         error("%s: invalid sha1 pointer in cache-tree",
 615                               sha1_to_hex(it->sha1));
 616                         return 1;
 617                 }
 618                 obj->used = 1;
 619                 mark_object_reachable(obj);
 620                 if (obj->type != OBJ_TREE)
 621                         err |= objerror(obj, "non-tree in cache-tree");
 622         }
 623         for (i = 0; i < it->subtree_nr; i++)
 624                 err |= fsck_cache_tree(it->down[i]->cache_tree);
 625         return err;
 626 }
 627
 628 static char const * const fsck_usage[] = {
 629         N_("git fsck [<options>] [<object>...]"),
 630         NULL
 631 };
 632
 633 static struct option fsck_opts[] = {
 634         OPT__VERBOSE(&verbose, N_("be verbose")),
 635         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
 636         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
 637         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
 638         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
 639         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
 640         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
 641         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
 642         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
 643         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
 644         OPT_BOOL(0, "lost-found", &write_lost_and_found,
 645                                 N_("write dangling objects in .git/lost-found")),
 646         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 647         OPT_END(),
 648 };
 649
 650 int cmd_fsck(int argc, const char **argv, const char *prefix)
 651 {
 652         int i, heads;
 653         struct alternate_object_database *alt;
 654
 655         errors_found = 0;
 656         check_replace_refs = 0;
 657
 658         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 659
 660         fsck_walk_options.walk = mark_object;
 661         fsck_obj_options.walk = mark_used;
 662         fsck_obj_options.error_func = fsck_error_func;
 663         if (check_strict)
 664                 fsck_obj_options.strict = 1;
 665
 666         if (show_progress == -1)
 667                 show_progress = isatty(2);
 668         if (verbose)
 669                 show_progress = 0;
 670
 671         if (write_lost_and_found) {
 672                 check_full = 1;
 673                 include_reflogs = 0;
 674         }
 675
 676         git_config(fsck_config, NULL);
 677
 678         fsck_head_link();
 679         if (!connectivity_only)
 680                 fsck_object_dir(get_object_directory());
 681
 682         prepare_alt_odb();
 683         for (alt = alt_odb_list; alt; alt = alt->next) {
 684                 char namebuf[PATH_MAX];
 685                 int namelen = alt->name - alt->base;
 686                 memcpy(namebuf, alt->base, namelen);
 687                 namebuf[namelen - 1] = 0;
 688                 fsck_object_dir(namebuf);
 689         }
 690
 691         if (check_full) {
 692                 struct packed_git *p;
 693                 uint32_t total = 0, count = 0;
 694                 struct progress *progress = NULL;
 695
 696                 prepare_packed_git();
 697
 698                 if (show_progress) {
 699                         for (p = packed_git; p; p = p->next) {
 700                                 if (open_pack_index(p))
 701                                         continue;
 702                                 total += p->num_objects;
 703                         }
 704
 705                         progress = start_progress(_("Checking objects"), total);
 706                 }
 707                 for (p = packed_git; p; p = p->next) {
 708                         /* verify gives error messages itself */
 709                         if (verify_pack(p, fsck_obj_buffer,
 710                                         progress, count))
 711                                 errors_found |= ERROR_PACK;
 712                         count += p->num_objects;
 713                 }
 714                 stop_progress(&progress);
 715         }
 716
 717         heads = 0;
 718         for (i = 0; i < argc; i++) {
 719                 const char *arg = argv[i];
 720                 unsigned char sha1[20];
 721                 if (!get_sha1(arg, sha1)) {
 722                         struct object *obj = lookup_object(sha1);
 723
 724                         /* Error is printed by lookup_object(). */
 725                         if (!obj)
 726                                 continue;
 727
 728                         obj->used = 1;
 729                         mark_object_reachable(obj);
 730                         heads++;
 731                         continue;
 732                 }
 733                 error("invalid parameter: expected sha1, got '%s'", arg);
 734         }
 735
 736         /*
 737          * If we've not been given any explicit head information, do the
 738          * default ones from .git/refs. We also consider the index file
 739          * in this case (ie this implies --cache).
 740          */
 741         if (!heads) {
 742                 get_default_heads();
 743                 keep_cache_objects = 1;
 744         }
 745
 746         if (keep_cache_objects) {
 747                 read_cache();
 748                 for (i = 0; i < active_nr; i++) {
 749                         unsigned int mode;
 750                         struct blob *blob;
 751                         struct object *obj;
 752
 753                         mode = active_cache[i]->ce_mode;
 754                         if (S_ISGITLINK(mode))
 755                                 continue;
 756                         blob = lookup_blob(active_cache[i]->sha1);
 757                         if (!blob)
 758                                 continue;
 759                         obj = &blob->object;
 760                         obj->used = 1;
 761                         mark_object_reachable(obj);
 762                 }
 763                 if (active_cache_tree)
 764                         fsck_cache_tree(active_cache_tree);
 765         }
 766
 767         check_connectivity();
 768         return errors_found;
 769 }