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 #include "decorate.h"
  17
  18 #define REACHABLE 0x0001
  19 #define SEEN      0x0002
  20 #define HAS_OBJ   0x0004
  21
  22 static int show_root;
  23 static int show_tags;
  24 static int show_unreachable;
  25 static int include_reflogs = 1;
  26 static int check_full = 1;
  27 static int connectivity_only;
  28 static int check_strict;
  29 static int keep_cache_objects;
  30 static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
  31 static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
  32 static struct object_id head_oid;
  33 static const char *head_points_at;
  34 static int errors_found;
  35 static int write_lost_and_found;
  36 static int verbose;
  37 static int show_progress = -1;
  38 static int show_dangling = 1;
  39 static int name_objects;
  40 #define ERROR_OBJECT 01
  41 #define ERROR_REACHABLE 02
  42 #define ERROR_PACK 04
  43 #define ERROR_REFS 010
  44
  45 static const char *describe_object(struct object *obj)
  46 {
  47         static struct strbuf buf = STRBUF_INIT;
  48         char *name = name_objects ?
  49                 lookup_decoration(fsck_walk_options.object_names, obj) : NULL;
  50
  51         strbuf_reset(&buf);
  52         strbuf_addstr(&buf, oid_to_hex(&obj->oid));
  53         if (name)
  54                 strbuf_addf(&buf, " (%s)", name);
  55
  56         return buf.buf;
  57 }
  58
  59 static const char *printable_type(struct object *obj)
  60 {
  61         const char *ret;
  62
  63         if (obj->type == OBJ_NONE) {
  64                 enum object_type type = sha1_object_info(obj->oid.hash, NULL);
  65                 if (type > 0)
  66                         object_as_type(obj, type, 0);
  67         }
  68
  69         ret = typename(obj->type);
  70         if (!ret)
  71                 ret = "unknown";
  72
  73         return ret;
  74 }
  75
  76 static int fsck_config(const char *var, const char *value, void *cb)
  77 {
  78         if (strcmp(var, "fsck.skiplist") == 0) {
  79                 const char *path;
  80                 struct strbuf sb = STRBUF_INIT;
  81
  82                 if (git_config_pathname(&path, var, value))
  83                         return 1;
  84                 strbuf_addf(&sb, "skiplist=%s", path);
  85                 free((char *)path);
  86                 fsck_set_msg_types(&fsck_obj_options, sb.buf);
  87                 strbuf_release(&sb);
  88                 return 0;
  89         }
  90
  91         if (skip_prefix(var, "fsck.", &var)) {
  92                 fsck_set_msg_type(&fsck_obj_options, var, value);
  93                 return 0;
  94         }
  95
  96         return git_default_config(var, value, cb);
  97 }
  98
  99 static void objreport(struct object *obj, const char *msg_type,
 100                         const char *err)
 101 {
 102         fprintf(stderr, "%s in %s %s: %s\n",
 103                 msg_type, printable_type(obj), describe_object(obj), err);
 104 }
 105
 106 static int objerror(struct object *obj, const char *err)
 107 {
 108         errors_found |= ERROR_OBJECT;
 109         objreport(obj, "error", err);
 110         return -1;
 111 }
 112
 113 static int fsck_error_func(struct fsck_options *o,
 114         struct object *obj, int type, const char *message)
 115 {
 116         objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message);
 117         return (type == FSCK_WARN) ? 0 : 1;
 118 }
 119
 120 static struct object_array pending;
 121
 122 static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
 123 {
 124         struct object *parent = data;
 125
 126         /*
 127          * The only case data is NULL or type is OBJ_ANY is when
 128          * mark_object_reachable() calls us.  All the callers of
 129          * that function has non-NULL obj hence ...
 130          */
 131         if (!obj) {
 132                 /* ... these references to parent->fld are safe here */
 133                 printf("broken link from %7s %s\n",
 134                            printable_type(parent), describe_object(parent));
 135                 printf("broken link from %7s %s\n",
 136                            (type == OBJ_ANY ? "unknown" : typename(type)), "unknown");
 137                 errors_found |= ERROR_REACHABLE;
 138                 return 1;
 139         }
 140
 141         if (type != OBJ_ANY && obj->type != type)
 142                 /* ... and the reference to parent is safe here */
 143                 objerror(parent, "wrong object type in link");
 144
 145         if (obj->flags & REACHABLE)
 146                 return 0;
 147         obj->flags |= REACHABLE;
 148         if (!(obj->flags & HAS_OBJ)) {
 149                 if (parent && !has_object_file(&obj->oid)) {
 150                         printf("broken link from %7s %s\n",
 151                                  printable_type(parent), describe_object(parent));
 152                         printf("              to %7s %s\n",
 153                                  printable_type(obj), describe_object(obj));
 154                         errors_found |= ERROR_REACHABLE;
 155                 }
 156                 return 1;
 157         }
 158
 159         add_object_array(obj, NULL, &pending);
 160         return 0;
 161 }
 162
 163 static void mark_object_reachable(struct object *obj)
 164 {
 165         mark_object(obj, OBJ_ANY, NULL, NULL);
 166 }
 167
 168 static int traverse_one_object(struct object *obj)
 169 {
 170         int result;
 171         struct tree *tree = NULL;
 172
 173         if (obj->type == OBJ_TREE) {
 174                 tree = (struct tree *)obj;
 175                 if (parse_tree(tree) < 0)
 176                         return 1; /* error already displayed */
 177         }
 178         result = fsck_walk(obj, obj, &fsck_walk_options);
 179         if (tree)
 180                 free_tree_buffer(tree);
 181         return result;
 182 }
 183
 184 static int traverse_reachable(void)
 185 {
 186         struct progress *progress = NULL;
 187         unsigned int nr = 0;
 188         int result = 0;
 189         if (show_progress)
 190                 progress = start_progress_delay(_("Checking connectivity"), 0, 0, 2);
 191         while (pending.nr) {
 192                 struct object_array_entry *entry;
 193                 struct object *obj;
 194
 195                 entry = pending.objects + --pending.nr;
 196                 obj = entry->item;
 197                 result |= traverse_one_object(obj);
 198                 display_progress(progress, ++nr);
 199         }
 200         stop_progress(&progress);
 201         return !!result;
 202 }
 203
 204 static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
 205 {
 206         if (!obj)
 207                 return 1;
 208         obj->used = 1;
 209         return 0;
 210 }
 211
 212 /*
 213  * Check a single reachable object
 214  */
 215 static void check_reachable_object(struct object *obj)
 216 {
 217         /*
 218          * We obviously want the object to be parsed,
 219          * except if it was in a pack-file and we didn't
 220          * do a full fsck
 221          */
 222         if (!(obj->flags & HAS_OBJ)) {
 223                 if (has_sha1_pack(obj->oid.hash))
 224                         return; /* it is in pack - forget about it */
 225                 printf("missing %s %s\n", printable_type(obj),
 226                         describe_object(obj));
 227                 errors_found |= ERROR_REACHABLE;
 228                 return;
 229         }
 230 }
 231
 232 /*
 233  * Check a single unreachable object
 234  */
 235 static void check_unreachable_object(struct object *obj)
 236 {
 237         /*
 238          * Missing unreachable object? Ignore it. It's not like
 239          * we miss it (since it can't be reached), nor do we want
 240          * to complain about it being unreachable (since it does
 241          * not exist).
 242          */
 243         if (!(obj->flags & HAS_OBJ))
 244                 return;
 245
 246         /*
 247          * Unreachable object that exists? Show it if asked to,
 248          * since this is something that is prunable.
 249          */
 250         if (show_unreachable) {
 251                 printf("unreachable %s %s\n", printable_type(obj),
 252                         describe_object(obj));
 253                 return;
 254         }
 255
 256         /*
 257          * "!used" means that nothing at all points to it, including
 258          * other unreachable objects. In other words, it's the "tip"
 259          * of some set of unreachable objects, usually a commit that
 260          * got dropped.
 261          *
 262          * Such starting points are more interesting than some random
 263          * set of unreachable objects, so we show them even if the user
 264          * hasn't asked for _all_ unreachable objects. If you have
 265          * deleted a branch by mistake, this is a prime candidate to
 266          * start looking at, for example.
 267          */
 268         if (!obj->used) {
 269                 if (show_dangling)
 270                         printf("dangling %s %s\n", printable_type(obj),
 271                                describe_object(obj));
 272                 if (write_lost_and_found) {
 273                         char *filename = git_pathdup("lost-found/%s/%s",
 274                                 obj->type == OBJ_COMMIT ? "commit" : "other",
 275                                 describe_object(obj));
 276                         FILE *f;
 277
 278                         if (safe_create_leading_directories_const(filename)) {
 279                                 error("Could not create lost-found");
 280                                 free(filename);
 281                                 return;
 282                         }
 283                         f = xfopen(filename, "w");
 284                         if (obj->type == OBJ_BLOB) {
 285                                 if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
 286                                         die_errno("Could not write '%s'", filename);
 287                         } else
 288                                 fprintf(f, "%s\n", describe_object(obj));
 289                         if (fclose(f))
 290                                 die_errno("Could not finish '%s'",
 291                                           filename);
 292                         free(filename);
 293                 }
 294                 return;
 295         }
 296
 297         /*
 298          * Otherwise? It's there, it's unreachable, and some other unreachable
 299          * object points to it. Ignore it - it's not interesting, and we showed
 300          * all the interesting cases above.
 301          */
 302 }
 303
 304 static void check_object(struct object *obj)
 305 {
 306         if (verbose)
 307                 fprintf(stderr, "Checking %s\n", describe_object(obj));
 308
 309         if (obj->flags & REACHABLE)
 310                 check_reachable_object(obj);
 311         else
 312                 check_unreachable_object(obj);
 313 }
 314
 315 static void check_connectivity(void)
 316 {
 317         int i, max;
 318
 319         /* Traverse the pending reachable objects */
 320         traverse_reachable();
 321
 322         /* Look up all the requirements, warn about missing objects.. */
 323         max = get_max_object_index();
 324         if (verbose)
 325                 fprintf(stderr, "Checking connectivity (%d objects)\n", max);
 326
 327         for (i = 0; i < max; i++) {
 328                 struct object *obj = get_indexed_object(i);
 329
 330                 if (obj)
 331                         check_object(obj);
 332         }
 333 }
 334
 335 static int fsck_obj(struct object *obj)
 336 {
 337         if (obj->flags & SEEN)
 338                 return 0;
 339         obj->flags |= SEEN;
 340
 341         if (verbose)
 342                 fprintf(stderr, "Checking %s %s\n",
 343                         printable_type(obj), describe_object(obj));
 344
 345         if (fsck_walk(obj, NULL, &fsck_obj_options))
 346                 objerror(obj, "broken links");
 347         if (fsck_object(obj, NULL, 0, &fsck_obj_options))
 348                 return -1;
 349
 350         if (obj->type == OBJ_TREE) {
 351                 struct tree *item = (struct tree *) obj;
 352
 353                 free_tree_buffer(item);
 354         }
 355
 356         if (obj->type == OBJ_COMMIT) {
 357                 struct commit *commit = (struct commit *) obj;
 358
 359                 free_commit_buffer(commit);
 360
 361                 if (!commit->parents && show_root)
 362                         printf("root %s\n", describe_object(&commit->object));
 363         }
 364
 365         if (obj->type == OBJ_TAG) {
 366                 struct tag *tag = (struct tag *) obj;
 367
 368                 if (show_tags && tag->tagged) {
 369                         printf("tagged %s %s", printable_type(tag->tagged),
 370                                 describe_object(tag->tagged));
 371                         printf(" (%s) in %s\n", tag->tag,
 372                                 describe_object(&tag->object));
 373                 }
 374         }
 375
 376         return 0;
 377 }
 378
 379 static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
 380                            unsigned long size, void *buffer, int *eaten)
 381 {
 382         /*
 383          * Note, buffer may be NULL if type is OBJ_BLOB. See
 384          * verify_packfile(), data_valid variable for details.
 385          */
 386         struct object *obj;
 387         obj = parse_object_buffer(oid, type, size, buffer, eaten);
 388         if (!obj) {
 389                 errors_found |= ERROR_OBJECT;
 390                 return error("%s: object corrupt or missing", oid_to_hex(oid));
 391         }
 392         obj->flags = HAS_OBJ;
 393         return fsck_obj(obj);
 394 }
 395
 396 static int default_refs;
 397
 398 static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
 399         timestamp_t timestamp)
 400 {
 401         struct object *obj;
 402
 403         if (!is_null_oid(oid)) {
 404                 obj = lookup_object(oid->hash);
 405                 if (obj && (obj->flags & HAS_OBJ)) {
 406                         if (timestamp && name_objects)
 407                                 add_decoration(fsck_walk_options.object_names,
 408                                         obj,
 409                                         xstrfmt("%s@{%"PRItime"}", refname, timestamp));
 410                         obj->used = 1;
 411                         mark_object_reachable(obj);
 412                 } else {
 413                         error("%s: invalid reflog entry %s", refname, oid_to_hex(oid));
 414                         errors_found |= ERROR_REACHABLE;
 415                 }
 416         }
 417 }
 418
 419 static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid,
 420                 const char *email, timestamp_t timestamp, int tz,
 421                 const char *message, void *cb_data)
 422 {
 423         const char *refname = cb_data;
 424
 425         if (verbose)
 426                 fprintf(stderr, "Checking reflog %s->%s\n",
 427                         oid_to_hex(ooid), oid_to_hex(noid));
 428
 429         fsck_handle_reflog_oid(refname, ooid, 0);
 430         fsck_handle_reflog_oid(refname, noid, timestamp);
 431         return 0;
 432 }
 433
 434 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
 435                               int flag, void *cb_data)
 436 {
 437         for_each_reflog_ent(logname, fsck_handle_reflog_ent, (void *)logname);
 438         return 0;
 439 }
 440
 441 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 442                            int flag, void *cb_data)
 443 {
 444         struct object *obj;
 445
 446         obj = parse_object(oid);
 447         if (!obj) {
 448                 error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
 449                 errors_found |= ERROR_REACHABLE;
 450                 /* We'll continue with the rest despite the error.. */
 451                 return 0;
 452         }
 453         if (obj->type != OBJ_COMMIT && is_branch(refname)) {
 454                 error("%s: not a commit", refname);
 455                 errors_found |= ERROR_REFS;
 456         }
 457         default_refs++;
 458         obj->used = 1;
 459         if (name_objects)
 460                 add_decoration(fsck_walk_options.object_names,
 461                         obj, xstrdup(refname));
 462         mark_object_reachable(obj);
 463
 464         return 0;
 465 }
 466
 467 static void get_default_heads(void)
 468 {
 469         if (head_points_at && !is_null_oid(&head_oid))
 470                 fsck_handle_ref("HEAD", &head_oid, 0, NULL);
 471         for_each_rawref(fsck_handle_ref, NULL);
 472         if (include_reflogs)
 473                 for_each_reflog(fsck_handle_reflog, NULL);
 474
 475         /*
 476          * Not having any default heads isn't really fatal, but
 477          * it does mean that "--unreachable" no longer makes any
 478          * sense (since in this case everything will obviously
 479          * be unreachable by definition.
 480          *
 481          * Showing dangling objects is valid, though (as those
 482          * dangling objects are likely lost heads).
 483          *
 484          * So we just print a warning about it, and clear the
 485          * "show_unreachable" flag.
 486          */
 487         if (!default_refs) {
 488                 fprintf(stderr, "notice: No default references\n");
 489                 show_unreachable = 0;
 490         }
 491 }
 492
 493 static struct object *parse_loose_object(const struct object_id *oid,
 494                                          const char *path)
 495 {
 496         struct object *obj;
 497         void *contents;
 498         enum object_type type;
 499         unsigned long size;
 500         int eaten;
 501
 502         if (read_loose_object(path, oid->hash, &type, &size, &contents) < 0)
 503                 return NULL;
 504
 505         if (!contents && type != OBJ_BLOB)
 506                 die("BUG: read_loose_object streamed a non-blob");
 507
 508         obj = parse_object_buffer(oid, type, size, contents, &eaten);
 509
 510         if (!eaten)
 511                 free(contents);
 512         return obj;
 513 }
 514
 515 static int fsck_loose(const struct object_id *oid, const char *path, void *data)
 516 {
 517         struct object *obj = parse_loose_object(oid, path);
 518
 519         if (!obj) {
 520                 errors_found |= ERROR_OBJECT;
 521                 error("%s: object corrupt or missing: %s",
 522                       oid_to_hex(oid), path);
 523                 return 0; /* keep checking other objects */
 524         }
 525
 526         obj->flags = HAS_OBJ;
 527         if (fsck_obj(obj))
 528                 errors_found |= ERROR_OBJECT;
 529         return 0;
 530 }
 531
 532 static int fsck_cruft(const char *basename, const char *path, void *data)
 533 {
 534         if (!starts_with(basename, "tmp_obj_"))
 535                 fprintf(stderr, "bad sha1 file: %s\n", path);
 536         return 0;
 537 }
 538
 539 static int fsck_subdir(int nr, const char *path, void *progress)
 540 {
 541         display_progress(progress, nr + 1);
 542         return 0;
 543 }
 544
 545 static void fsck_object_dir(const char *path)
 546 {
 547         struct progress *progress = NULL;
 548
 549         if (verbose)
 550                 fprintf(stderr, "Checking object directory\n");
 551
 552         if (show_progress)
 553                 progress = start_progress(_("Checking object directories"), 256);
 554
 555         for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
 556                                       progress);
 557         display_progress(progress, 256);
 558         stop_progress(&progress);
 559 }
 560
 561 static int fsck_head_link(void)
 562 {
 563         int null_is_error = 0;
 564
 565         if (verbose)
 566                 fprintf(stderr, "Checking HEAD link\n");
 567
 568         head_points_at = resolve_ref_unsafe("HEAD", 0, head_oid.hash, NULL);
 569         if (!head_points_at) {
 570                 errors_found |= ERROR_REFS;
 571                 return error("Invalid HEAD");
 572         }
 573         if (!strcmp(head_points_at, "HEAD"))
 574                 /* detached HEAD */
 575                 null_is_error = 1;
 576         else if (!starts_with(head_points_at, "refs/heads/")) {
 577                 errors_found |= ERROR_REFS;
 578                 return error("HEAD points to something strange (%s)",
 579                              head_points_at);
 580         }
 581         if (is_null_oid(&head_oid)) {
 582                 if (null_is_error) {
 583                         errors_found |= ERROR_REFS;
 584                         return error("HEAD: detached HEAD points at nothing");
 585                 }
 586                 fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
 587                         head_points_at + 11);
 588         }
 589         return 0;
 590 }
 591
 592 static int fsck_cache_tree(struct cache_tree *it)
 593 {
 594         int i;
 595         int err = 0;
 596
 597         if (verbose)
 598                 fprintf(stderr, "Checking cache tree\n");
 599
 600         if (0 <= it->entry_count) {
 601                 struct object *obj = parse_object(&it->oid);
 602                 if (!obj) {
 603                         error("%s: invalid sha1 pointer in cache-tree",
 604                               oid_to_hex(&it->oid));
 605                         errors_found |= ERROR_REFS;
 606                         return 1;
 607                 }
 608                 obj->used = 1;
 609                 if (name_objects)
 610                         add_decoration(fsck_walk_options.object_names,
 611                                 obj, xstrdup(":"));
 612                 mark_object_reachable(obj);
 613                 if (obj->type != OBJ_TREE)
 614                         err |= objerror(obj, "non-tree in cache-tree");
 615         }
 616         for (i = 0; i < it->subtree_nr; i++)
 617                 err |= fsck_cache_tree(it->down[i]->cache_tree);
 618         return err;
 619 }
 620
 621 static void mark_object_for_connectivity(const struct object_id *oid)
 622 {
 623         struct object *obj = lookup_unknown_object(oid->hash);
 624         obj->flags |= HAS_OBJ;
 625 }
 626
 627 static int mark_loose_for_connectivity(const struct object_id *oid,
 628                                        const char *path,
 629                                        void *data)
 630 {
 631         mark_object_for_connectivity(oid);
 632         return 0;
 633 }
 634
 635 static int mark_packed_for_connectivity(const struct object_id *oid,
 636                                         struct packed_git *pack,
 637                                         uint32_t pos,
 638                                         void *data)
 639 {
 640         mark_object_for_connectivity(oid);
 641         return 0;
 642 }
 643
 644 static char const * const fsck_usage[] = {
 645         N_("git fsck [<options>] [<object>...]"),
 646         NULL
 647 };
 648
 649 static struct option fsck_opts[] = {
 650         OPT__VERBOSE(&verbose, N_("be verbose")),
 651         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
 652         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
 653         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
 654         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
 655         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
 656         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
 657         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
 658         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
 659         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
 660         OPT_BOOL(0, "lost-found", &write_lost_and_found,
 661                                 N_("write dangling objects in .git/lost-found")),
 662         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 663         OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
 664         OPT_END(),
 665 };
 666
 667 int cmd_fsck(int argc, const char **argv, const char *prefix)
 668 {
 669         int i, heads;
 670         struct alternate_object_database *alt;
 671
 672         errors_found = 0;
 673         check_replace_refs = 0;
 674
 675         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 676
 677         fsck_walk_options.walk = mark_object;
 678         fsck_obj_options.walk = mark_used;
 679         fsck_obj_options.error_func = fsck_error_func;
 680         if (check_strict)
 681                 fsck_obj_options.strict = 1;
 682
 683         if (show_progress == -1)
 684                 show_progress = isatty(2);
 685         if (verbose)
 686                 show_progress = 0;
 687
 688         if (write_lost_and_found) {
 689                 check_full = 1;
 690                 include_reflogs = 0;
 691         }
 692
 693         if (name_objects)
 694                 fsck_walk_options.object_names =
 695                         xcalloc(1, sizeof(struct decoration));
 696
 697         git_config(fsck_config, NULL);
 698
 699         fsck_head_link();
 700         if (connectivity_only) {
 701                 for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
 702                 for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
 703         } else {
 704                 fsck_object_dir(get_object_directory());
 705
 706                 prepare_alt_odb();
 707                 for (alt = alt_odb_list; alt; alt = alt->next)
 708                         fsck_object_dir(alt->path);
 709
 710                 if (check_full) {
 711                         struct packed_git *p;
 712                         uint32_t total = 0, count = 0;
 713                         struct progress *progress = NULL;
 714
 715                         prepare_packed_git();
 716
 717                         if (show_progress) {
 718                                 for (p = packed_git; p; p = p->next) {
 719                                         if (open_pack_index(p))
 720                                                 continue;
 721                                         total += p->num_objects;
 722                                 }
 723
 724                                 progress = start_progress(_("Checking objects"), total);
 725                         }
 726                         for (p = packed_git; p; p = p->next) {
 727                                 /* verify gives error messages itself */
 728                                 if (verify_pack(p, fsck_obj_buffer,
 729                                                 progress, count))
 730                                         errors_found |= ERROR_PACK;
 731                                 count += p->num_objects;
 732                         }
 733                         stop_progress(&progress);
 734                 }
 735         }
 736
 737         heads = 0;
 738         for (i = 0; i < argc; i++) {
 739                 const char *arg = argv[i];
 740                 unsigned char sha1[20];
 741                 if (!get_sha1(arg, sha1)) {
 742                         struct object *obj = lookup_object(sha1);
 743
 744                         if (!obj || !(obj->flags & HAS_OBJ)) {
 745                                 error("%s: object missing", sha1_to_hex(sha1));
 746                                 errors_found |= ERROR_OBJECT;
 747                                 continue;
 748                         }
 749
 750                         obj->used = 1;
 751                         if (name_objects)
 752                                 add_decoration(fsck_walk_options.object_names,
 753                                         obj, xstrdup(arg));
 754                         mark_object_reachable(obj);
 755                         heads++;
 756                         continue;
 757                 }
 758                 error("invalid parameter: expected sha1, got '%s'", arg);
 759                 errors_found |= ERROR_OBJECT;
 760         }
 761
 762         /*
 763          * If we've not been given any explicit head information, do the
 764          * default ones from .git/refs. We also consider the index file
 765          * in this case (ie this implies --cache).
 766          */
 767         if (!argc) {
 768                 get_default_heads();
 769                 keep_cache_objects = 1;
 770         }
 771
 772         if (keep_cache_objects) {
 773                 verify_index_checksum = 1;
 774                 read_cache();
 775                 for (i = 0; i < active_nr; i++) {
 776                         unsigned int mode;
 777                         struct blob *blob;
 778                         struct object *obj;
 779
 780                         mode = active_cache[i]->ce_mode;
 781                         if (S_ISGITLINK(mode))
 782                                 continue;
 783                         blob = lookup_blob(&active_cache[i]->oid);
 784                         if (!blob)
 785                                 continue;
 786                         obj = &blob->object;
 787                         obj->used = 1;
 788                         if (name_objects)
 789                                 add_decoration(fsck_walk_options.object_names,
 790                                         obj,
 791                                         xstrfmt(":%s", active_cache[i]->name));
 792                         mark_object_reachable(obj);
 793                 }
 794                 if (active_cache_tree)
 795                         fsck_cache_tree(active_cache_tree);
 796         }
 797
 798         check_connectivity();
 799         return errors_found;
 800 }