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 #include "packfile.h"
  19
  20 #define REACHABLE 0x0001
  21 #define SEEN      0x0002
  22 #define HAS_OBJ   0x0004
  23 /* This flag is set if something points to this object. */
  24 #define USED      0x0008
  25
  26 static int show_root;
  27 static int show_tags;
  28 static int show_unreachable;
  29 static int include_reflogs = 1;
  30 static int check_full = 1;
  31 static int connectivity_only;
  32 static int check_strict;
  33 static int keep_cache_objects;
  34 static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
  35 static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
  36 static struct object_id head_oid;
  37 static const char *head_points_at;
  38 static int errors_found;
  39 static int write_lost_and_found;
  40 static int verbose;
  41 static int show_progress = -1;
  42 static int show_dangling = 1;
  43 static int name_objects;
  44 #define ERROR_OBJECT 01
  45 #define ERROR_REACHABLE 02
  46 #define ERROR_PACK 04
  47 #define ERROR_REFS 010
  48
  49 static const char *describe_object(struct object *obj)
  50 {
  51         static struct strbuf buf = STRBUF_INIT;
  52         char *name = name_objects ?
  53                 lookup_decoration(fsck_walk_options.object_names, obj) : NULL;
  54
  55         strbuf_reset(&buf);
  56         strbuf_addstr(&buf, oid_to_hex(&obj->oid));
  57         if (name)
  58                 strbuf_addf(&buf, " (%s)", name);
  59
  60         return buf.buf;
  61 }
  62
  63 static const char *printable_type(struct object *obj)
  64 {
  65         const char *ret;
  66
  67         if (obj->type == OBJ_NONE) {
  68                 enum object_type type = sha1_object_info(obj->oid.hash, NULL);
  69                 if (type > 0)
  70                         object_as_type(obj, type, 0);
  71         }
  72
  73         ret = typename(obj->type);
  74         if (!ret)
  75                 ret = "unknown";
  76
  77         return ret;
  78 }
  79
  80 static int fsck_config(const char *var, const char *value, void *cb)
  81 {
  82         if (strcmp(var, "fsck.skiplist") == 0) {
  83                 const char *path;
  84                 struct strbuf sb = STRBUF_INIT;
  85
  86                 if (git_config_pathname(&path, var, value))
  87                         return 1;
  88                 strbuf_addf(&sb, "skiplist=%s", path);
  89                 free((char *)path);
  90                 fsck_set_msg_types(&fsck_obj_options, sb.buf);
  91                 strbuf_release(&sb);
  92                 return 0;
  93         }
  94
  95         if (skip_prefix(var, "fsck.", &var)) {
  96                 fsck_set_msg_type(&fsck_obj_options, var, value);
  97                 return 0;
  98         }
  99
 100         return git_default_config(var, value, cb);
 101 }
 102
 103 static void objreport(struct object *obj, const char *msg_type,
 104                         const char *err)
 105 {
 106         fprintf(stderr, "%s in %s %s: %s\n",
 107                 msg_type, printable_type(obj), describe_object(obj), err);
 108 }
 109
 110 static int objerror(struct object *obj, const char *err)
 111 {
 112         errors_found |= ERROR_OBJECT;
 113         objreport(obj, "error", err);
 114         return -1;
 115 }
 116
 117 static int fsck_error_func(struct fsck_options *o,
 118         struct object *obj, int type, const char *message)
 119 {
 120         objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message);
 121         return (type == FSCK_WARN) ? 0 : 1;
 122 }
 123
 124 static struct object_array pending;
 125
 126 static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
 127 {
 128         struct object *parent = data;
 129
 130         /*
 131          * The only case data is NULL or type is OBJ_ANY is when
 132          * mark_object_reachable() calls us.  All the callers of
 133          * that function has non-NULL obj hence ...
 134          */
 135         if (!obj) {
 136                 /* ... these references to parent->fld are safe here */
 137                 printf("broken link from %7s %s\n",
 138                            printable_type(parent), describe_object(parent));
 139                 printf("broken link from %7s %s\n",
 140                            (type == OBJ_ANY ? "unknown" : typename(type)), "unknown");
 141                 errors_found |= ERROR_REACHABLE;
 142                 return 1;
 143         }
 144
 145         if (type != OBJ_ANY && obj->type != type)
 146                 /* ... and the reference to parent is safe here */
 147                 objerror(parent, "wrong object type in link");
 148
 149         if (obj->flags & REACHABLE)
 150                 return 0;
 151         obj->flags |= REACHABLE;
 152         if (!(obj->flags & HAS_OBJ)) {
 153                 if (parent && !has_object_file(&obj->oid)) {
 154                         printf("broken link from %7s %s\n",
 155                                  printable_type(parent), describe_object(parent));
 156                         printf("              to %7s %s\n",
 157                                  printable_type(obj), describe_object(obj));
 158                         errors_found |= ERROR_REACHABLE;
 159                 }
 160                 return 1;
 161         }
 162
 163         add_object_array(obj, NULL, &pending);
 164         return 0;
 165 }
 166
 167 static void mark_object_reachable(struct object *obj)
 168 {
 169         mark_object(obj, OBJ_ANY, NULL, NULL);
 170 }
 171
 172 static int traverse_one_object(struct object *obj)
 173 {
 174         return fsck_walk(obj, obj, &fsck_walk_options);
 175 }
 176
 177 static int traverse_reachable(void)
 178 {
 179         struct progress *progress = NULL;
 180         unsigned int nr = 0;
 181         int result = 0;
 182         if (show_progress)
 183                 progress = start_delayed_progress(_("Checking connectivity"), 0);
 184         while (pending.nr) {
 185                 struct object_array_entry *entry;
 186                 struct object *obj;
 187
 188                 entry = pending.objects + --pending.nr;
 189                 obj = entry->item;
 190                 result |= traverse_one_object(obj);
 191                 display_progress(progress, ++nr);
 192         }
 193         stop_progress(&progress);
 194         return !!result;
 195 }
 196
 197 static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
 198 {
 199         if (!obj)
 200                 return 1;
 201         obj->flags |= USED;
 202         return 0;
 203 }
 204
 205 /*
 206  * Check a single reachable object
 207  */
 208 static void check_reachable_object(struct object *obj)
 209 {
 210         /*
 211          * We obviously want the object to be parsed,
 212          * except if it was in a pack-file and we didn't
 213          * do a full fsck
 214          */
 215         if (!(obj->flags & HAS_OBJ)) {
 216                 if (has_sha1_pack(obj->oid.hash))
 217                         return; /* it is in pack - forget about it */
 218                 printf("missing %s %s\n", printable_type(obj),
 219                         describe_object(obj));
 220                 errors_found |= ERROR_REACHABLE;
 221                 return;
 222         }
 223 }
 224
 225 /*
 226  * Check a single unreachable object
 227  */
 228 static void check_unreachable_object(struct object *obj)
 229 {
 230         /*
 231          * Missing unreachable object? Ignore it. It's not like
 232          * we miss it (since it can't be reached), nor do we want
 233          * to complain about it being unreachable (since it does
 234          * not exist).
 235          */
 236         if (!(obj->flags & HAS_OBJ))
 237                 return;
 238
 239         /*
 240          * Unreachable object that exists? Show it if asked to,
 241          * since this is something that is prunable.
 242          */
 243         if (show_unreachable) {
 244                 printf("unreachable %s %s\n", printable_type(obj),
 245                         describe_object(obj));
 246                 return;
 247         }
 248
 249         /*
 250          * "!USED" means that nothing at all points to it, including
 251          * other unreachable objects. In other words, it's the "tip"
 252          * of some set of unreachable objects, usually a commit that
 253          * got dropped.
 254          *
 255          * Such starting points are more interesting than some random
 256          * set of unreachable objects, so we show them even if the user
 257          * hasn't asked for _all_ unreachable objects. If you have
 258          * deleted a branch by mistake, this is a prime candidate to
 259          * start looking at, for example.
 260          */
 261         if (!(obj->flags & USED)) {
 262                 if (show_dangling)
 263                         printf("dangling %s %s\n", printable_type(obj),
 264                                describe_object(obj));
 265                 if (write_lost_and_found) {
 266                         char *filename = git_pathdup("lost-found/%s/%s",
 267                                 obj->type == OBJ_COMMIT ? "commit" : "other",
 268                                 describe_object(obj));
 269                         FILE *f;
 270
 271                         if (safe_create_leading_directories_const(filename)) {
 272                                 error("Could not create lost-found");
 273                                 free(filename);
 274                                 return;
 275                         }
 276                         f = xfopen(filename, "w");
 277                         if (obj->type == OBJ_BLOB) {
 278                                 if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
 279                                         die_errno("Could not write '%s'", filename);
 280                         } else
 281                                 fprintf(f, "%s\n", describe_object(obj));
 282                         if (fclose(f))
 283                                 die_errno("Could not finish '%s'",
 284                                           filename);
 285                         free(filename);
 286                 }
 287                 return;
 288         }
 289
 290         /*
 291          * Otherwise? It's there, it's unreachable, and some other unreachable
 292          * object points to it. Ignore it - it's not interesting, and we showed
 293          * all the interesting cases above.
 294          */
 295 }
 296
 297 static void check_object(struct object *obj)
 298 {
 299         if (verbose)
 300                 fprintf(stderr, "Checking %s\n", describe_object(obj));
 301
 302         if (obj->flags & REACHABLE)
 303                 check_reachable_object(obj);
 304         else
 305                 check_unreachable_object(obj);
 306 }
 307
 308 static void check_connectivity(void)
 309 {
 310         int i, max;
 311
 312         /* Traverse the pending reachable objects */
 313         traverse_reachable();
 314
 315         /* Look up all the requirements, warn about missing objects.. */
 316         max = get_max_object_index();
 317         if (verbose)
 318                 fprintf(stderr, "Checking connectivity (%d objects)\n", max);
 319
 320         for (i = 0; i < max; i++) {
 321                 struct object *obj = get_indexed_object(i);
 322
 323                 if (obj)
 324                         check_object(obj);
 325         }
 326 }
 327
 328 static int fsck_obj(struct object *obj)
 329 {
 330         int err;
 331
 332         if (obj->flags & SEEN)
 333                 return 0;
 334         obj->flags |= SEEN;
 335
 336         if (verbose)
 337                 fprintf(stderr, "Checking %s %s\n",
 338                         printable_type(obj), describe_object(obj));
 339
 340         if (fsck_walk(obj, NULL, &fsck_obj_options))
 341                 objerror(obj, "broken links");
 342         err = fsck_object(obj, NULL, 0, &fsck_obj_options);
 343         if (err)
 344                 goto out;
 345
 346         if (obj->type == OBJ_COMMIT) {
 347                 struct commit *commit = (struct commit *) obj;
 348
 349                 if (!commit->parents && show_root)
 350                         printf("root %s\n", describe_object(&commit->object));
 351         }
 352
 353         if (obj->type == OBJ_TAG) {
 354                 struct tag *tag = (struct tag *) obj;
 355
 356                 if (show_tags && tag->tagged) {
 357                         printf("tagged %s %s", printable_type(tag->tagged),
 358                                 describe_object(tag->tagged));
 359                         printf(" (%s) in %s\n", tag->tag,
 360                                 describe_object(&tag->object));
 361                 }
 362         }
 363
 364 out:
 365         if (obj->type == OBJ_TREE)
 366                 free_tree_buffer((struct tree *)obj);
 367         if (obj->type == OBJ_COMMIT)
 368                 free_commit_buffer((struct commit *)obj);
 369         return err;
 370 }
 371
 372 static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
 373                            unsigned long size, void *buffer, int *eaten)
 374 {
 375         /*
 376          * Note, buffer may be NULL if type is OBJ_BLOB. See
 377          * verify_packfile(), data_valid variable for details.
 378          */
 379         struct object *obj;
 380         obj = parse_object_buffer(oid, type, size, buffer, eaten);
 381         if (!obj) {
 382                 errors_found |= ERROR_OBJECT;
 383                 return error("%s: object corrupt or missing", oid_to_hex(oid));
 384         }
 385         obj->flags &= ~(REACHABLE | SEEN);
 386         obj->flags |= HAS_OBJ;
 387         return fsck_obj(obj);
 388 }
 389
 390 static int default_refs;
 391
 392 static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
 393         timestamp_t timestamp)
 394 {
 395         struct object *obj;
 396
 397         if (!is_null_oid(oid)) {
 398                 obj = lookup_object(oid->hash);
 399                 if (obj && (obj->flags & HAS_OBJ)) {
 400                         if (timestamp && name_objects)
 401                                 add_decoration(fsck_walk_options.object_names,
 402                                         obj,
 403                                         xstrfmt("%s@{%"PRItime"}", refname, timestamp));
 404                         obj->flags |= USED;
 405                         mark_object_reachable(obj);
 406                 } else {
 407                         error("%s: invalid reflog entry %s", refname, oid_to_hex(oid));
 408                         errors_found |= ERROR_REACHABLE;
 409                 }
 410         }
 411 }
 412
 413 static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid,
 414                 const char *email, timestamp_t timestamp, int tz,
 415                 const char *message, void *cb_data)
 416 {
 417         const char *refname = cb_data;
 418
 419         if (verbose)
 420                 fprintf(stderr, "Checking reflog %s->%s\n",
 421                         oid_to_hex(ooid), oid_to_hex(noid));
 422
 423         fsck_handle_reflog_oid(refname, ooid, 0);
 424         fsck_handle_reflog_oid(refname, noid, timestamp);
 425         return 0;
 426 }
 427
 428 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
 429                               int flag, void *cb_data)
 430 {
 431         for_each_reflog_ent(logname, fsck_handle_reflog_ent, (void *)logname);
 432         return 0;
 433 }
 434
 435 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 436                            int flag, void *cb_data)
 437 {
 438         struct object *obj;
 439
 440         obj = parse_object(oid);
 441         if (!obj) {
 442                 error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
 443                 errors_found |= ERROR_REACHABLE;
 444                 /* We'll continue with the rest despite the error.. */
 445                 return 0;
 446         }
 447         if (obj->type != OBJ_COMMIT && is_branch(refname)) {
 448                 error("%s: not a commit", refname);
 449                 errors_found |= ERROR_REFS;
 450         }
 451         default_refs++;
 452         obj->flags |= USED;
 453         if (name_objects)
 454                 add_decoration(fsck_walk_options.object_names,
 455                         obj, xstrdup(refname));
 456         mark_object_reachable(obj);
 457
 458         return 0;
 459 }
 460
 461 static void get_default_heads(void)
 462 {
 463         if (head_points_at && !is_null_oid(&head_oid))
 464                 fsck_handle_ref("HEAD", &head_oid, 0, NULL);
 465         for_each_rawref(fsck_handle_ref, NULL);
 466         if (include_reflogs)
 467                 for_each_reflog(fsck_handle_reflog, NULL);
 468
 469         /*
 470          * Not having any default heads isn't really fatal, but
 471          * it does mean that "--unreachable" no longer makes any
 472          * sense (since in this case everything will obviously
 473          * be unreachable by definition.
 474          *
 475          * Showing dangling objects is valid, though (as those
 476          * dangling objects are likely lost heads).
 477          *
 478          * So we just print a warning about it, and clear the
 479          * "show_unreachable" flag.
 480          */
 481         if (!default_refs) {
 482                 fprintf(stderr, "notice: No default references\n");
 483                 show_unreachable = 0;
 484         }
 485 }
 486
 487 static struct object *parse_loose_object(const struct object_id *oid,
 488                                          const char *path)
 489 {
 490         struct object *obj;
 491         void *contents;
 492         enum object_type type;
 493         unsigned long size;
 494         int eaten;
 495
 496         if (read_loose_object(path, oid->hash, &type, &size, &contents) < 0)
 497                 return NULL;
 498
 499         if (!contents && type != OBJ_BLOB)
 500                 die("BUG: read_loose_object streamed a non-blob");
 501
 502         obj = parse_object_buffer(oid, type, size, contents, &eaten);
 503
 504         if (!eaten)
 505                 free(contents);
 506         return obj;
 507 }
 508
 509 static int fsck_loose(const struct object_id *oid, const char *path, void *data)
 510 {
 511         struct object *obj = parse_loose_object(oid, path);
 512
 513         if (!obj) {
 514                 errors_found |= ERROR_OBJECT;
 515                 error("%s: object corrupt or missing: %s",
 516                       oid_to_hex(oid), path);
 517                 return 0; /* keep checking other objects */
 518         }
 519
 520         obj->flags &= ~(REACHABLE | SEEN);
 521         obj->flags |= HAS_OBJ;
 522         if (fsck_obj(obj))
 523                 errors_found |= ERROR_OBJECT;
 524         return 0;
 525 }
 526
 527 static int fsck_cruft(const char *basename, const char *path, void *data)
 528 {
 529         if (!starts_with(basename, "tmp_obj_"))
 530                 fprintf(stderr, "bad sha1 file: %s\n", path);
 531         return 0;
 532 }
 533
 534 static int fsck_subdir(unsigned int nr, const char *path, void *progress)
 535 {
 536         display_progress(progress, nr + 1);
 537         return 0;
 538 }
 539
 540 static void fsck_object_dir(const char *path)
 541 {
 542         struct progress *progress = NULL;
 543
 544         if (verbose)
 545                 fprintf(stderr, "Checking object directory\n");
 546
 547         if (show_progress)
 548                 progress = start_progress(_("Checking object directories"), 256);
 549
 550         for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
 551                                       progress);
 552         display_progress(progress, 256);
 553         stop_progress(&progress);
 554 }
 555
 556 static int fsck_head_link(void)
 557 {
 558         int null_is_error = 0;
 559
 560         if (verbose)
 561                 fprintf(stderr, "Checking HEAD link\n");
 562
 563         head_points_at = resolve_ref_unsafe("HEAD", 0, head_oid.hash, NULL);
 564         if (!head_points_at) {
 565                 errors_found |= ERROR_REFS;
 566                 return error("Invalid HEAD");
 567         }
 568         if (!strcmp(head_points_at, "HEAD"))
 569                 /* detached HEAD */
 570                 null_is_error = 1;
 571         else if (!starts_with(head_points_at, "refs/heads/")) {
 572                 errors_found |= ERROR_REFS;
 573                 return error("HEAD points to something strange (%s)",
 574                              head_points_at);
 575         }
 576         if (is_null_oid(&head_oid)) {
 577                 if (null_is_error) {
 578                         errors_found |= ERROR_REFS;
 579                         return error("HEAD: detached HEAD points at nothing");
 580                 }
 581                 fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
 582                         head_points_at + 11);
 583         }
 584         return 0;
 585 }
 586
 587 static int fsck_cache_tree(struct cache_tree *it)
 588 {
 589         int i;
 590         int err = 0;
 591
 592         if (verbose)
 593                 fprintf(stderr, "Checking cache tree\n");
 594
 595         if (0 <= it->entry_count) {
 596                 struct object *obj = parse_object(&it->oid);
 597                 if (!obj) {
 598                         error("%s: invalid sha1 pointer in cache-tree",
 599                               oid_to_hex(&it->oid));
 600                         errors_found |= ERROR_REFS;
 601                         return 1;
 602                 }
 603                 obj->flags |= USED;
 604                 if (name_objects)
 605                         add_decoration(fsck_walk_options.object_names,
 606                                 obj, xstrdup(":"));
 607                 mark_object_reachable(obj);
 608                 if (obj->type != OBJ_TREE)
 609                         err |= objerror(obj, "non-tree in cache-tree");
 610         }
 611         for (i = 0; i < it->subtree_nr; i++)
 612                 err |= fsck_cache_tree(it->down[i]->cache_tree);
 613         return err;
 614 }
 615
 616 static void mark_object_for_connectivity(const struct object_id *oid)
 617 {
 618         struct object *obj = lookup_unknown_object(oid->hash);
 619         obj->flags |= HAS_OBJ;
 620 }
 621
 622 static int mark_loose_for_connectivity(const struct object_id *oid,
 623                                        const char *path,
 624                                        void *data)
 625 {
 626         mark_object_for_connectivity(oid);
 627         return 0;
 628 }
 629
 630 static int mark_packed_for_connectivity(const struct object_id *oid,
 631                                         struct packed_git *pack,
 632                                         uint32_t pos,
 633                                         void *data)
 634 {
 635         mark_object_for_connectivity(oid);
 636         return 0;
 637 }
 638
 639 static char const * const fsck_usage[] = {
 640         N_("git fsck [<options>] [<object>...]"),
 641         NULL
 642 };
 643
 644 static struct option fsck_opts[] = {
 645         OPT__VERBOSE(&verbose, N_("be verbose")),
 646         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
 647         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
 648         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
 649         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
 650         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
 651         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
 652         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
 653         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
 654         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
 655         OPT_BOOL(0, "lost-found", &write_lost_and_found,
 656                                 N_("write dangling objects in .git/lost-found")),
 657         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 658         OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
 659         OPT_END(),
 660 };
 661
 662 int cmd_fsck(int argc, const char **argv, const char *prefix)
 663 {
 664         int i;
 665         struct alternate_object_database *alt;
 666
 667         errors_found = 0;
 668         check_replace_refs = 0;
 669
 670         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 671
 672         fsck_walk_options.walk = mark_object;
 673         fsck_obj_options.walk = mark_used;
 674         fsck_obj_options.error_func = fsck_error_func;
 675         if (check_strict)
 676                 fsck_obj_options.strict = 1;
 677
 678         if (show_progress == -1)
 679                 show_progress = isatty(2);
 680         if (verbose)
 681                 show_progress = 0;
 682
 683         if (write_lost_and_found) {
 684                 check_full = 1;
 685                 include_reflogs = 0;
 686         }
 687
 688         if (name_objects)
 689                 fsck_walk_options.object_names =
 690                         xcalloc(1, sizeof(struct decoration));
 691
 692         git_config(fsck_config, NULL);
 693
 694         fsck_head_link();
 695         if (connectivity_only) {
 696                 for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
 697                 for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
 698         } else {
 699                 fsck_object_dir(get_object_directory());
 700
 701                 prepare_alt_odb();
 702                 for (alt = alt_odb_list; alt; alt = alt->next)
 703                         fsck_object_dir(alt->path);
 704
 705                 if (check_full) {
 706                         struct packed_git *p;
 707                         uint32_t total = 0, count = 0;
 708                         struct progress *progress = NULL;
 709
 710                         prepare_packed_git();
 711
 712                         if (show_progress) {
 713                                 for (p = packed_git; p; p = p->next) {
 714                                         if (open_pack_index(p))
 715                                                 continue;
 716                                         total += p->num_objects;
 717                                 }
 718
 719                                 progress = start_progress(_("Checking objects"), total);
 720                         }
 721                         for (p = packed_git; p; p = p->next) {
 722                                 /* verify gives error messages itself */
 723                                 if (verify_pack(p, fsck_obj_buffer,
 724                                                 progress, count))
 725                                         errors_found |= ERROR_PACK;
 726                                 count += p->num_objects;
 727                         }
 728                         stop_progress(&progress);
 729                 }
 730         }
 731
 732         for (i = 0; i < argc; i++) {
 733                 const char *arg = argv[i];
 734                 struct object_id oid;
 735                 if (!get_oid(arg, &oid)) {
 736                         struct object *obj = lookup_object(oid.hash);
 737
 738                         if (!obj || !(obj->flags & HAS_OBJ)) {
 739                                 error("%s: object missing", oid_to_hex(&oid));
 740                                 errors_found |= ERROR_OBJECT;
 741                                 continue;
 742                         }
 743
 744                         obj->flags |= USED;
 745                         if (name_objects)
 746                                 add_decoration(fsck_walk_options.object_names,
 747                                         obj, xstrdup(arg));
 748                         mark_object_reachable(obj);
 749                         continue;
 750                 }
 751                 error("invalid parameter: expected sha1, got '%s'", arg);
 752                 errors_found |= ERROR_OBJECT;
 753         }
 754
 755         /*
 756          * If we've not been given any explicit head information, do the
 757          * default ones from .git/refs. We also consider the index file
 758          * in this case (ie this implies --cache).
 759          */
 760         if (!argc) {
 761                 get_default_heads();
 762                 keep_cache_objects = 1;
 763         }
 764
 765         if (keep_cache_objects) {
 766                 verify_index_checksum = 1;
 767                 read_cache();
 768                 for (i = 0; i < active_nr; i++) {
 769                         unsigned int mode;
 770                         struct blob *blob;
 771                         struct object *obj;
 772
 773                         mode = active_cache[i]->ce_mode;
 774                         if (S_ISGITLINK(mode))
 775                                 continue;
 776                         blob = lookup_blob(&active_cache[i]->oid);
 777                         if (!blob)
 778                                 continue;
 779                         obj = &blob->object;
 780                         obj->flags |= USED;
 781                         if (name_objects)
 782                                 add_decoration(fsck_walk_options.object_names,
 783                                         obj,
 784                                         xstrfmt(":%s", active_cache[i]->name));
 785                         mark_object_reachable(obj);
 786                 }
 787                 if (active_cache_tree)
 788                         fsck_cache_tree(active_cache_tree);
 789         }
 790
 791         check_connectivity();
 792         return errors_found;
 793 }