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                         char *filename = git_pathdup("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                                 free(filename);
 254                                 return;
 255                         }
 256                         if (!(f = fopen(filename, "w")))
 257                                 die_errno("Could not open '%s'", filename);
 258                         if (obj->type == OBJ_BLOB) {
 259                                 if (stream_blob_to_fd(fileno(f), obj->sha1, NULL, 1))
 260                                         die_errno("Could not write '%s'", filename);
 261                         } else
 262                                 fprintf(f, "%s\n", sha1_to_hex(obj->sha1));
 263                         if (fclose(f))
 264                                 die_errno("Could not finish '%s'",
 265                                           filename);
 266                         free(filename);
 267                 }
 268                 return;
 269         }
 270
 271         /*
 272          * Otherwise? It's there, it's unreachable, and some other unreachable
 273          * object points to it. Ignore it - it's not interesting, and we showed
 274          * all the interesting cases above.
 275          */
 276 }
 277
 278 static void check_object(struct object *obj)
 279 {
 280         if (verbose)
 281                 fprintf(stderr, "Checking %s\n", sha1_to_hex(obj->sha1));
 282
 283         if (obj->flags & REACHABLE)
 284                 check_reachable_object(obj);
 285         else
 286                 check_unreachable_object(obj);
 287 }
 288
 289 static void check_connectivity(void)
 290 {
 291         int i, max;
 292
 293         /* Traverse the pending reachable objects */
 294         traverse_reachable();
 295
 296         /* Look up all the requirements, warn about missing objects.. */
 297         max = get_max_object_index();
 298         if (verbose)
 299                 fprintf(stderr, "Checking connectivity (%d objects)\n", max);
 300
 301         for (i = 0; i < max; i++) {
 302                 struct object *obj = get_indexed_object(i);
 303
 304                 if (obj)
 305                         check_object(obj);
 306         }
 307 }
 308
 309 static int fsck_obj(struct object *obj)
 310 {
 311         if (obj->flags & SEEN)
 312                 return 0;
 313         obj->flags |= SEEN;
 314
 315         if (verbose)
 316                 fprintf(stderr, "Checking %s %s\n",
 317                         typename(obj->type), sha1_to_hex(obj->sha1));
 318
 319         if (fsck_walk(obj, NULL, &fsck_obj_options))
 320                 objerror(obj, "broken links");
 321         if (fsck_object(obj, NULL, 0, &fsck_obj_options))
 322                 return -1;
 323
 324         if (obj->type == OBJ_TREE) {
 325                 struct tree *item = (struct tree *) obj;
 326
 327                 free_tree_buffer(item);
 328         }
 329
 330         if (obj->type == OBJ_COMMIT) {
 331                 struct commit *commit = (struct commit *) obj;
 332
 333                 free_commit_buffer(commit);
 334
 335                 if (!commit->parents && show_root)
 336                         printf("root %s\n", sha1_to_hex(commit->object.sha1));
 337         }
 338
 339         if (obj->type == OBJ_TAG) {
 340                 struct tag *tag = (struct tag *) obj;
 341
 342                 if (show_tags && tag->tagged) {
 343                         printf("tagged %s %s", typename(tag->tagged->type), sha1_to_hex(tag->tagged->sha1));
 344                         printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1));
 345                 }
 346         }
 347
 348         return 0;
 349 }
 350
 351 static int fsck_sha1(const unsigned char *sha1)
 352 {
 353         struct object *obj = parse_object(sha1);
 354         if (!obj) {
 355                 errors_found |= ERROR_OBJECT;
 356                 return error("%s: object corrupt or missing",
 357                              sha1_to_hex(sha1));
 358         }
 359         obj->flags |= HAS_OBJ;
 360         return fsck_obj(obj);
 361 }
 362
 363 static int fsck_obj_buffer(const unsigned char *sha1, enum object_type type,
 364                            unsigned long size, void *buffer, int *eaten)
 365 {
 366         struct object *obj;
 367         obj = parse_object_buffer(sha1, type, size, buffer, eaten);
 368         if (!obj) {
 369                 errors_found |= ERROR_OBJECT;
 370                 return error("%s: object corrupt or missing", sha1_to_hex(sha1));
 371         }
 372         obj->flags = HAS_OBJ;
 373         return fsck_obj(obj);
 374 }
 375
 376 /*
 377  * This is the sorting chunk size: make it reasonably
 378  * big so that we can sort well..
 379  */
 380 #define MAX_SHA1_ENTRIES (1024)
 381
 382 struct sha1_entry {
 383         unsigned long ino;
 384         unsigned char sha1[20];
 385 };
 386
 387 static struct {
 388         unsigned long nr;
 389         struct sha1_entry *entry[MAX_SHA1_ENTRIES];
 390 } sha1_list;
 391
 392 static int ino_compare(const void *_a, const void *_b)
 393 {
 394         const struct sha1_entry *a = _a, *b = _b;
 395         unsigned long ino1 = a->ino, ino2 = b->ino;
 396         return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
 397 }
 398
 399 static void fsck_sha1_list(void)
 400 {
 401         int i, nr = sha1_list.nr;
 402
 403         if (SORT_DIRENT)
 404                 qsort(sha1_list.entry, nr,
 405                       sizeof(struct sha1_entry *), ino_compare);
 406         for (i = 0; i < nr; i++) {
 407                 struct sha1_entry *entry = sha1_list.entry[i];
 408                 unsigned char *sha1 = entry->sha1;
 409
 410                 sha1_list.entry[i] = NULL;
 411                 if (fsck_sha1(sha1))
 412                         errors_found |= ERROR_OBJECT;
 413                 free(entry);
 414         }
 415         sha1_list.nr = 0;
 416 }
 417
 418 static void add_sha1_list(unsigned char *sha1, unsigned long ino)
 419 {
 420         struct sha1_entry *entry = xmalloc(sizeof(*entry));
 421         int nr;
 422
 423         entry->ino = ino;
 424         hashcpy(entry->sha1, sha1);
 425         nr = sha1_list.nr;
 426         if (nr == MAX_SHA1_ENTRIES) {
 427                 fsck_sha1_list();
 428                 nr = 0;
 429         }
 430         sha1_list.entry[nr] = entry;
 431         sha1_list.nr = ++nr;
 432 }
 433
 434 static inline int is_loose_object_file(struct dirent *de,
 435                                        char *name, unsigned char *sha1)
 436 {
 437         if (strlen(de->d_name) != 38)
 438                 return 0;
 439         memcpy(name + 2, de->d_name, 39);
 440         return !get_sha1_hex(name, sha1);
 441 }
 442
 443 static void fsck_dir(int i, char *path)
 444 {
 445         DIR *dir = opendir(path);
 446         struct dirent *de;
 447         char name[100];
 448
 449         if (!dir)
 450                 return;
 451
 452         if (verbose)
 453                 fprintf(stderr, "Checking directory %s\n", path);
 454
 455         sprintf(name, "%02x", i);
 456         while ((de = readdir(dir)) != NULL) {
 457                 unsigned char sha1[20];
 458
 459                 if (is_dot_or_dotdot(de->d_name))
 460                         continue;
 461                 if (is_loose_object_file(de, name, sha1)) {
 462                         add_sha1_list(sha1, DIRENT_SORT_HINT(de));
 463                         continue;
 464                 }
 465                 if (starts_with(de->d_name, "tmp_obj_"))
 466                         continue;
 467                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 468         }
 469         closedir(dir);
 470 }
 471
 472 static int default_refs;
 473
 474 static void fsck_handle_reflog_sha1(const char *refname, unsigned char *sha1)
 475 {
 476         struct object *obj;
 477
 478         if (!is_null_sha1(sha1)) {
 479                 obj = lookup_object(sha1);
 480                 if (obj) {
 481                         obj->used = 1;
 482                         mark_object_reachable(obj);
 483                 } else {
 484                         error("%s: invalid reflog entry %s", refname, sha1_to_hex(sha1));
 485                         errors_found |= ERROR_REACHABLE;
 486                 }
 487         }
 488 }
 489
 490 static int fsck_handle_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 491                 const char *email, unsigned long timestamp, int tz,
 492                 const char *message, void *cb_data)
 493 {
 494         const char *refname = cb_data;
 495
 496         if (verbose)
 497                 fprintf(stderr, "Checking reflog %s->%s\n",
 498                         sha1_to_hex(osha1), sha1_to_hex(nsha1));
 499
 500         fsck_handle_reflog_sha1(refname, osha1);
 501         fsck_handle_reflog_sha1(refname, nsha1);
 502         return 0;
 503 }
 504
 505 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
 506                               int flag, void *cb_data)
 507 {
 508         for_each_reflog_ent(logname, fsck_handle_reflog_ent, (void *)logname);
 509         return 0;
 510 }
 511
 512 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 513                            int flag, void *cb_data)
 514 {
 515         struct object *obj;
 516
 517         obj = parse_object(oid->hash);
 518         if (!obj) {
 519                 error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
 520                 errors_found |= ERROR_REACHABLE;
 521                 /* We'll continue with the rest despite the error.. */
 522                 return 0;
 523         }
 524         if (obj->type != OBJ_COMMIT && is_branch(refname))
 525                 error("%s: not a commit", refname);
 526         default_refs++;
 527         obj->used = 1;
 528         mark_object_reachable(obj);
 529
 530         return 0;
 531 }
 532
 533 static void get_default_heads(void)
 534 {
 535         if (head_points_at && !is_null_oid(&head_oid))
 536                 fsck_handle_ref("HEAD", &head_oid, 0, NULL);
 537         for_each_rawref(fsck_handle_ref, NULL);
 538         if (include_reflogs)
 539                 for_each_reflog(fsck_handle_reflog, NULL);
 540
 541         /*
 542          * Not having any default heads isn't really fatal, but
 543          * it does mean that "--unreachable" no longer makes any
 544          * sense (since in this case everything will obviously
 545          * be unreachable by definition.
 546          *
 547          * Showing dangling objects is valid, though (as those
 548          * dangling objects are likely lost heads).
 549          *
 550          * So we just print a warning about it, and clear the
 551          * "show_unreachable" flag.
 552          */
 553         if (!default_refs) {
 554                 fprintf(stderr, "notice: No default references\n");
 555                 show_unreachable = 0;
 556         }
 557 }
 558
 559 static void fsck_object_dir(const char *path)
 560 {
 561         int i;
 562         struct progress *progress = NULL;
 563
 564         if (verbose)
 565                 fprintf(stderr, "Checking object directory\n");
 566
 567         if (show_progress)
 568                 progress = start_progress(_("Checking object directories"), 256);
 569         for (i = 0; i < 256; i++) {
 570                 static char dir[4096];
 571                 sprintf(dir, "%s/%02x", path, i);
 572                 fsck_dir(i, dir);
 573                 display_progress(progress, i+1);
 574         }
 575         stop_progress(&progress);
 576         fsck_sha1_list();
 577 }
 578
 579 static int fsck_head_link(void)
 580 {
 581         int flag;
 582         int null_is_error = 0;
 583
 584         if (verbose)
 585                 fprintf(stderr, "Checking HEAD link\n");
 586
 587         head_points_at = resolve_ref_unsafe("HEAD", 0, head_oid.hash, &flag);
 588         if (!head_points_at)
 589                 return error("Invalid HEAD");
 590         if (!strcmp(head_points_at, "HEAD"))
 591                 /* detached HEAD */
 592                 null_is_error = 1;
 593         else if (!starts_with(head_points_at, "refs/heads/"))
 594                 return error("HEAD points to something strange (%s)",
 595                              head_points_at);
 596         if (is_null_oid(&head_oid)) {
 597                 if (null_is_error)
 598                         return error("HEAD: detached HEAD points at nothing");
 599                 fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
 600                         head_points_at + 11);
 601         }
 602         return 0;
 603 }
 604
 605 static int fsck_cache_tree(struct cache_tree *it)
 606 {
 607         int i;
 608         int err = 0;
 609
 610         if (verbose)
 611                 fprintf(stderr, "Checking cache tree\n");
 612
 613         if (0 <= it->entry_count) {
 614                 struct object *obj = parse_object(it->sha1);
 615                 if (!obj) {
 616                         error("%s: invalid sha1 pointer in cache-tree",
 617                               sha1_to_hex(it->sha1));
 618                         return 1;
 619                 }
 620                 obj->used = 1;
 621                 mark_object_reachable(obj);
 622                 if (obj->type != OBJ_TREE)
 623                         err |= objerror(obj, "non-tree in cache-tree");
 624         }
 625         for (i = 0; i < it->subtree_nr; i++)
 626                 err |= fsck_cache_tree(it->down[i]->cache_tree);
 627         return err;
 628 }
 629
 630 static char const * const fsck_usage[] = {
 631         N_("git fsck [<options>] [<object>...]"),
 632         NULL
 633 };
 634
 635 static struct option fsck_opts[] = {
 636         OPT__VERBOSE(&verbose, N_("be verbose")),
 637         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
 638         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
 639         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
 640         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
 641         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
 642         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
 643         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
 644         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
 645         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
 646         OPT_BOOL(0, "lost-found", &write_lost_and_found,
 647                                 N_("write dangling objects in .git/lost-found")),
 648         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 649         OPT_END(),
 650 };
 651
 652 int cmd_fsck(int argc, const char **argv, const char *prefix)
 653 {
 654         int i, heads;
 655         struct alternate_object_database *alt;
 656
 657         errors_found = 0;
 658         check_replace_refs = 0;
 659
 660         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 661
 662         fsck_walk_options.walk = mark_object;
 663         fsck_obj_options.walk = mark_used;
 664         fsck_obj_options.error_func = fsck_error_func;
 665         if (check_strict)
 666                 fsck_obj_options.strict = 1;
 667
 668         if (show_progress == -1)
 669                 show_progress = isatty(2);
 670         if (verbose)
 671                 show_progress = 0;
 672
 673         if (write_lost_and_found) {
 674                 check_full = 1;
 675                 include_reflogs = 0;
 676         }
 677
 678         git_config(fsck_config, NULL);
 679
 680         fsck_head_link();
 681         if (!connectivity_only)
 682                 fsck_object_dir(get_object_directory());
 683
 684         prepare_alt_odb();
 685         for (alt = alt_odb_list; alt; alt = alt->next) {
 686                 char namebuf[PATH_MAX];
 687                 int namelen = alt->name - alt->base;
 688                 memcpy(namebuf, alt->base, namelen);
 689                 namebuf[namelen - 1] = 0;
 690                 fsck_object_dir(namebuf);
 691         }
 692
 693         if (check_full) {
 694                 struct packed_git *p;
 695                 uint32_t total = 0, count = 0;
 696                 struct progress *progress = NULL;
 697
 698                 prepare_packed_git();
 699
 700                 if (show_progress) {
 701                         for (p = packed_git; p; p = p->next) {
 702                                 if (open_pack_index(p))
 703                                         continue;
 704                                 total += p->num_objects;
 705                         }
 706
 707                         progress = start_progress(_("Checking objects"), total);
 708                 }
 709                 for (p = packed_git; p; p = p->next) {
 710                         /* verify gives error messages itself */
 711                         if (verify_pack(p, fsck_obj_buffer,
 712                                         progress, count))
 713                                 errors_found |= ERROR_PACK;
 714                         count += p->num_objects;
 715                 }
 716                 stop_progress(&progress);
 717         }
 718
 719         heads = 0;
 720         for (i = 0; i < argc; i++) {
 721                 const char *arg = argv[i];
 722                 unsigned char sha1[20];
 723                 if (!get_sha1(arg, sha1)) {
 724                         struct object *obj = lookup_object(sha1);
 725
 726                         /* Error is printed by lookup_object(). */
 727                         if (!obj)
 728                                 continue;
 729
 730                         obj->used = 1;
 731                         mark_object_reachable(obj);
 732                         heads++;
 733                         continue;
 734                 }
 735                 error("invalid parameter: expected sha1, got '%s'", arg);
 736         }
 737
 738         /*
 739          * If we've not been given any explicit head information, do the
 740          * default ones from .git/refs. We also consider the index file
 741          * in this case (ie this implies --cache).
 742          */
 743         if (!heads) {
 744                 get_default_heads();
 745                 keep_cache_objects = 1;
 746         }
 747
 748         if (keep_cache_objects) {
 749                 read_cache();
 750                 for (i = 0; i < active_nr; i++) {
 751                         unsigned int mode;
 752                         struct blob *blob;
 753                         struct object *obj;
 754
 755                         mode = active_cache[i]->ce_mode;
 756                         if (S_ISGITLINK(mode))
 757                                 continue;
 758                         blob = lookup_blob(active_cache[i]->sha1);
 759                         if (!blob)
 760                                 continue;
 761                         obj = &blob->object;
 762                         obj->used = 1;
 763                         mark_object_reachable(obj);
 764                 }
 765                 if (active_cache_tree)
 766                         fsck_cache_tree(active_cache_tree);
 767         }
 768
 769         check_connectivity();
 770         return errors_found;
 771 }