builtin/fsck.c

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