git.oblomov.eu Git - git/blob - 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 /* This flag is set if something points to this object. */
  23 #define USED      0x0008
  24
  25 static int show_root;
  26 static int show_tags;
  27 static int show_unreachable;
  28 static int include_reflogs = 1;
  29 static int check_full = 1;
  30 static int connectivity_only;
  31 static int check_strict;
  32 static int keep_cache_objects;
  33 static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
  34 static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
  35 static struct object_id head_oid;
  36 static const char *head_points_at;
  37 static int errors_found;
  38 static int write_lost_and_found;
  39 static int verbose;
  40 static int show_progress = -1;
  41 static int show_dangling = 1;
  42 static int name_objects;
  43 #define ERROR_OBJECT 01
  44 #define ERROR_REACHABLE 02
  45 #define ERROR_PACK 04
  46 #define ERROR_REFS 010
  47
  48 static const char *describe_object(struct object *obj)
  49 {
  50         static struct strbuf buf = STRBUF_INIT;
  51         char *name = name_objects ?
  52                 lookup_decoration(fsck_walk_options.object_names, obj) : NULL;
  53
  54         strbuf_reset(&buf);
  55         strbuf_addstr(&buf, oid_to_hex(&obj->oid));
  56         if (name)
  57                 strbuf_addf(&buf, " (%s)", name);
  58
  59         return buf.buf;
  60 }
  61
  62 static const char *printable_type(struct object *obj)
  63 {
  64         const char *ret;
  65
  66         if (obj->type == OBJ_NONE) {
  67                 enum object_type type = sha1_object_info(obj->oid.hash, NULL);
  68                 if (type > 0)
  69                         object_as_type(obj, type, 0);
  70         }
  71
  72         ret = typename(obj->type);
  73         if (!ret)
  74                 ret = "unknown";
  75
  76         return ret;
  77 }
  78
  79 static int fsck_config(const char *var, const char *value, void *cb)
  80 {
  81         if (strcmp(var, "fsck.skiplist") == 0) {
  82                 const char *path;
  83                 struct strbuf sb = STRBUF_INIT;
  84
  85                 if (git_config_pathname(&path, var, value))
  86                         return 1;
  87                 strbuf_addf(&sb, "skiplist=%s", path);
  88                 free((char *)path);
  89                 fsck_set_msg_types(&fsck_obj_options, sb.buf);
  90                 strbuf_release(&sb);
  91                 return 0;
  92         }
  93
  94         if (skip_prefix(var, "fsck.", &var)) {
  95                 fsck_set_msg_type(&fsck_obj_options, var, value);
  96                 return 0;
  97         }
  98
  99         return git_default_config(var, value, cb);
 100 }
 101
 102 static void objreport(struct object *obj, const char *msg_type,
 103                         const char *err)
 104 {
 105         fprintf(stderr, "%s in %s %s: %s\n",
 106                 msg_type, printable_type(obj), describe_object(obj), err);
 107 }
 108
 109 static int objerror(struct object *obj, const char *err)
 110 {
 111         errors_found |= ERROR_OBJECT;
 112         objreport(obj, "error", err);
 113         return -1;
 114 }
 115
 116 static int fsck_error_func(struct fsck_options *o,
 117         struct object *obj, int type, const char *message)
 118 {
 119         objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message);
 120         return (type == FSCK_WARN) ? 0 : 1;
 121 }
 122
 123 static struct object_array pending;
 124
 125 static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
 126 {
 127         struct object *parent = data;
 128
 129         /*
 130          * The only case data is NULL or type is OBJ_ANY is when
 131          * mark_object_reachable() calls us.  All the callers of
 132          * that function has non-NULL obj hence ...
 133          */
 134         if (!obj) {
 135                 /* ... these references to parent->fld are safe here */
 136                 printf("broken link from %7s %s\n",
 137                            printable_type(parent), describe_object(parent));
 138                 printf("broken link from %7s %s\n",
 139                            (type == OBJ_ANY ? "unknown" : typename(type)), "unknown");
 140                 errors_found |= ERROR_REACHABLE;
 141                 return 1;
 142         }
 143
 144         if (type != OBJ_ANY && obj->type != type)
 145                 /* ... and the reference to parent is safe here */
 146                 objerror(parent, "wrong object type in link");
 147
 148         if (obj->flags & REACHABLE)
 149                 return 0;
 150         obj->flags |= REACHABLE;
 151         if (!(obj->flags & HAS_OBJ)) {
 152                 if (parent && !has_object_file(&obj->oid)) {
 153                         printf("broken link from %7s %s\n",
 154                                  printable_type(parent), describe_object(parent));
 155                         printf("              to %7s %s\n",
 156                                  printable_type(obj), describe_object(obj));
 157                         errors_found |= ERROR_REACHABLE;
 158                 }
 159                 return 1;
 160         }
 161
 162         add_object_array(obj, NULL, &pending);
 163         return 0;
 164 }
 165
 166 static void mark_object_reachable(struct object *obj)
 167 {
 168         mark_object(obj, OBJ_ANY, NULL, NULL);
 169 }
 170
 171 static int traverse_one_object(struct object *obj)
 172 {
 173         return fsck_walk(obj, obj, &fsck_walk_options);
 174 }
 175
 176 static int traverse_reachable(void)
 177 {
 178         struct progress *progress = NULL;
 179         unsigned int nr = 0;
 180         int result = 0;
 181         if (show_progress)
 182                 progress = start_progress_delay(_("Checking connectivity"), 0, 0, 2);
 183         while (pending.nr) {
 184                 struct object_array_entry *entry;
 185                 struct object *obj;
 186
 187                 entry = pending.objects + --pending.nr;
 188                 obj = entry->item;
 189                 result |= traverse_one_object(obj);
 190                 display_progress(progress, ++nr);
 191         }
 192         stop_progress(&progress);
 193         return !!result;
 194 }
 195
 196 static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
 197 {
 198         if (!obj)
 199                 return 1;
 200         obj->flags |= USED;
 201         return 0;
 202 }
 203
 204 /*
 205  * Check a single reachable object
 206  */
 207 static void check_reachable_object(struct object *obj)
 208 {
 209         /*
 210          * We obviously want the object to be parsed,
 211          * except if it was in a pack-file and we didn't
 212          * do a full fsck
 213          */
 214         if (!(obj->flags & HAS_OBJ)) {
 215                 if (has_sha1_pack(obj->oid.hash))
 216                         return; /* it is in pack - forget about it */
 217                 printf("missing %s %s\n", printable_type(obj),
 218                         describe_object(obj));
 219                 errors_found |= ERROR_REACHABLE;
 220                 return;
 221         }
 222 }
 223
 224 /*
 225  * Check a single unreachable object
 226  */
 227 static void check_unreachable_object(struct object *obj)
 228 {
 229         /*
 230          * Missing unreachable object? Ignore it. It's not like
 231          * we miss it (since it can't be reached), nor do we want
 232          * to complain about it being unreachable (since it does
 233          * not exist).
 234          */
 235         if (!(obj->flags & HAS_OBJ))
 236                 return;
 237
 238         /*
 239          * Unreachable object that exists? Show it if asked to,
 240          * since this is something that is prunable.
 241          */
 242         if (show_unreachable) {
 243                 printf("unreachable %s %s\n", printable_type(obj),
 244                         describe_object(obj));
 245                 return;
 246         }
 247
 248         /*
 249          * "!USED" means that nothing at all points to it, including
 250          * other unreachable objects. In other words, it's the "tip"
 251          * of some set of unreachable objects, usually a commit that
 252          * got dropped.
 253          *
 254          * Such starting points are more interesting than some random
 255          * set of unreachable objects, so we show them even if the user
 256          * hasn't asked for _all_ unreachable objects. If you have
 257          * deleted a branch by mistake, this is a prime candidate to
 258          * start looking at, for example.
 259          */
 260         if (!(obj->flags & USED)) {
 261                 if (show_dangling)
 262                         printf("dangling %s %s\n", printable_type(obj),
 263                                describe_object(obj));
 264                 if (write_lost_and_found) {
 265                         char *filename = git_pathdup("lost-found/%s/%s",
 266                                 obj->type == OBJ_COMMIT ? "commit" : "other",
 267                                 describe_object(obj));
 268                         FILE *f;
 269
 270                         if (safe_create_leading_directories_const(filename)) {
 271                                 error("Could not create lost-found");
 272                                 free(filename);
 273                                 return;
 274                         }
 275                         f = xfopen(filename, "w");
 276                         if (obj->type == OBJ_BLOB) {
 277                                 if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
 278                                         die_errno("Could not write '%s'", filename);
 279                         } else
 280                                 fprintf(f, "%s\n", describe_object(obj));
 281                         if (fclose(f))
 282                                 die_errno("Could not finish '%s'",
 283                                           filename);
 284                         free(filename);
 285                 }
 286                 return;
 287         }
 288
 289         /*
 290          * Otherwise? It's there, it's unreachable, and some other unreachable
 291          * object points to it. Ignore it - it's not interesting, and we showed
 292          * all the interesting cases above.
 293          */
 294 }
 295
 296 static void check_object(struct object *obj)
 297 {
 298         if (verbose)
 299                 fprintf(stderr, "Checking %s\n", describe_object(obj));
 300
 301         if (obj->flags & REACHABLE)
 302                 check_reachable_object(obj);
 303         else
 304                 check_unreachable_object(obj);
 305 }
 306
 307 static void check_connectivity(void)
 308 {
 309         int i, max;
 310
 311         /* Traverse the pending reachable objects */
 312         traverse_reachable();
 313
 314         /* Look up all the requirements, warn about missing objects.. */
 315         max = get_max_object_index();
 316         if (verbose)
 317                 fprintf(stderr, "Checking connectivity (%d objects)\n", max);
 318
 319         for (i = 0; i < max; i++) {
 320                 struct object *obj = get_indexed_object(i);
 321
 322                 if (obj)
 323                         check_object(obj);
 324         }
 325 }
 326
 327 static int fsck_obj(struct object *obj)
 328 {
 329         int err;
 330
 331         if (obj->flags & SEEN)
 332                 return 0;
 333         obj->flags |= SEEN;
 334
 335         if (verbose)
 336                 fprintf(stderr, "Checking %s %s\n",
 337                         printable_type(obj), describe_object(obj));
 338
 339         if (fsck_walk(obj, NULL, &fsck_obj_options))
 340                 objerror(obj, "broken links");
 341         err = fsck_object(obj, NULL, 0, &fsck_obj_options);
 342         if (err)
 343                 goto out;
 344
 345         if (obj->type == OBJ_COMMIT) {
 346                 struct commit *commit = (struct commit *) obj;
 347
 348                 if (!commit->parents && show_root)
 349                         printf("root %s\n", describe_object(&commit->object));
 350         }
 351
 352         if (obj->type == OBJ_TAG) {
 353                 struct tag *tag = (struct tag *) obj;
 354
 355                 if (show_tags && tag->tagged) {
 356                         printf("tagged %s %s", printable_type(tag->tagged),
 357                                 describe_object(tag->tagged));
 358                         printf(" (%s) in %s\n", tag->tag,
 359                                 describe_object(&tag->object));
 360                 }
 361         }
 362
 363 out:
 364         if (obj->type == OBJ_TREE)
 365                 free_tree_buffer((struct tree *)obj);
 366         if (obj->type == OBJ_COMMIT)
 367                 free_commit_buffer((struct commit *)obj);
 368         return err;
 369 }
 370
 371 static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
 372                            unsigned long size, void *buffer, int *eaten)
 373 {
 374         /*
 375          * Note, buffer may be NULL if type is OBJ_BLOB. See
 376          * verify_packfile(), data_valid variable for details.
 377          */
 378         struct object *obj;
 379         obj = parse_object_buffer(oid, type, size, buffer, eaten);
 380         if (!obj) {
 381                 errors_found |= ERROR_OBJECT;
 382                 return error("%s: object corrupt or missing", oid_to_hex(oid));
 383         }
 384         obj->flags &= ~(REACHABLE | SEEN);
 385         obj->flags |= HAS_OBJ;
 386         return fsck_obj(obj);
 387 }
 388
 389 static int default_refs;
 390
 391 static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
 392         timestamp_t timestamp)
 393 {
 394         struct object *obj;
 395
 396         if (!is_null_oid(oid)) {
 397                 obj = lookup_object(oid->hash);
 398                 if (obj && (obj->flags & HAS_OBJ)) {
 399                         if (timestamp && name_objects)
 400                                 add_decoration(fsck_walk_options.object_names,
 401                                         obj,
 402                                         xstrfmt("%s@{%"PRItime"}", refname, timestamp));
 403                         obj->flags |= USED;
 404                         mark_object_reachable(obj);
 405                 } else {
 406                         error("%s: invalid reflog entry %s", refname, oid_to_hex(oid));
 407                         errors_found |= ERROR_REACHABLE;
 408                 }
 409         }
 410 }
 411
 412 static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid,
 413                 const char *email, timestamp_t timestamp, int tz,
 414                 const char *message, void *cb_data)
 415 {
 416         const char *refname = cb_data;
 417
 418         if (verbose)
 419                 fprintf(stderr, "Checking reflog %s->%s\n",
 420                         oid_to_hex(ooid), oid_to_hex(noid));
 421
 422         fsck_handle_reflog_oid(refname, ooid, 0);
 423         fsck_handle_reflog_oid(refname, noid, timestamp);
 424         return 0;
 425 }
 426
 427 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
 428                               int flag, void *cb_data)
 429 {
 430         for_each_reflog_ent(logname, fsck_handle_reflog_ent, (void *)logname);
 431         return 0;
 432 }
 433
 434 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 435                            int flag, void *cb_data)
 436 {
 437         struct object *obj;
 438
 439         obj = parse_object(oid);
 440         if (!obj) {
 441                 error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
 442                 errors_found |= ERROR_REACHABLE;
 443                 /* We'll continue with the rest despite the error.. */
 444                 return 0;
 445         }
 446         if (obj->type != OBJ_COMMIT && is_branch(refname)) {
 447                 error("%s: not a commit", refname);
 448                 errors_found |= ERROR_REFS;
 449         }
 450         default_refs++;
 451         obj->flags |= USED;
 452         if (name_objects)
 453                 add_decoration(fsck_walk_options.object_names,
 454                         obj, xstrdup(refname));
 455         mark_object_reachable(obj);
 456
 457         return 0;
 458 }
 459
 460 static void get_default_heads(void)
 461 {
 462         if (head_points_at && !is_null_oid(&head_oid))
 463                 fsck_handle_ref("HEAD", &head_oid, 0, NULL);
 464         for_each_rawref(fsck_handle_ref, NULL);
 465         if (include_reflogs)
 466                 for_each_reflog(fsck_handle_reflog, NULL);
 467
 468         /*
 469          * Not having any default heads isn't really fatal, but
 470          * it does mean that "--unreachable" no longer makes any
 471          * sense (since in this case everything will obviously
 472          * be unreachable by definition.
 473          *
 474          * Showing dangling objects is valid, though (as those
 475          * dangling objects are likely lost heads).
 476          *
 477          * So we just print a warning about it, and clear the
 478          * "show_unreachable" flag.
 479          */
 480         if (!default_refs) {
 481                 fprintf(stderr, "notice: No default references\n");
 482                 show_unreachable = 0;
 483         }
 484 }
 485
 486 static struct object *parse_loose_object(const struct object_id *oid,
 487                                          const char *path)
 488 {
 489         struct object *obj;
 490         void *contents;
 491         enum object_type type;
 492         unsigned long size;
 493         int eaten;
 494
 495         if (read_loose_object(path, oid->hash, &type, &size, &contents) < 0)
 496                 return NULL;
 497
 498         if (!contents && type != OBJ_BLOB)
 499                 die("BUG: read_loose_object streamed a non-blob");
 500
 501         obj = parse_object_buffer(oid, type, size, contents, &eaten);
 502
 503         if (!eaten)
 504                 free(contents);
 505         return obj;
 506 }
 507
 508 static int fsck_loose(const struct object_id *oid, const char *path, void *data)
 509 {
 510         struct object *obj = parse_loose_object(oid, path);
 511
 512         if (!obj) {
 513                 errors_found |= ERROR_OBJECT;
 514                 error("%s: object corrupt or missing: %s",
 515                       oid_to_hex(oid), path);
 516                 return 0; /* keep checking other objects */
 517         }
 518
 519         obj->flags &= ~(REACHABLE | SEEN);
 520         obj->flags |= HAS_OBJ;
 521         if (fsck_obj(obj))
 522                 errors_found |= ERROR_OBJECT;
 523         return 0;
 524 }
 525
 526 static int fsck_cruft(const char *basename, const char *path, void *data)
 527 {
 528         if (!starts_with(basename, "tmp_obj_"))
 529                 fprintf(stderr, "bad sha1 file: %s\n", path);
 530         return 0;
 531 }
 532
 533 static int fsck_subdir(unsigned int nr, const char *path, void *progress)
 534 {
 535         display_progress(progress, nr + 1);
 536         return 0;
 537 }
 538
 539 static void fsck_object_dir(const char *path)
 540 {
 541         struct progress *progress = NULL;
 542
 543         if (verbose)
 544                 fprintf(stderr, "Checking object directory\n");
 545
 546         if (show_progress)
 547                 progress = start_progress(_("Checking object directories"), 256);
 548
 549         for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
 550                                       progress);
 551         display_progress(progress, 256);
 552         stop_progress(&progress);
 553 }
 554
 555 static int fsck_head_link(void)
 556 {
 557         int null_is_error = 0;
 558
 559         if (verbose)
 560                 fprintf(stderr, "Checking HEAD link\n");
 561
 562         head_points_at = resolve_ref_unsafe("HEAD", 0, head_oid.hash, NULL);
 563         if (!head_points_at) {
 564                 errors_found |= ERROR_REFS;
 565                 return error("Invalid HEAD");
 566         }
 567         if (!strcmp(head_points_at, "HEAD"))
 568                 /* detached HEAD */
 569                 null_is_error = 1;
 570         else if (!starts_with(head_points_at, "refs/heads/")) {
 571                 errors_found |= ERROR_REFS;
 572                 return error("HEAD points to something strange (%s)",
 573                              head_points_at);
 574         }
 575         if (is_null_oid(&head_oid)) {
 576                 if (null_is_error) {
 577                         errors_found |= ERROR_REFS;
 578                         return error("HEAD: detached HEAD points at nothing");
 579                 }
 580                 fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
 581                         head_points_at + 11);
 582         }
 583         return 0;
 584 }
 585
 586 static int fsck_cache_tree(struct cache_tree *it)
 587 {
 588         int i;
 589         int err = 0;
 590
 591         if (verbose)
 592                 fprintf(stderr, "Checking cache tree\n");
 593
 594         if (0 <= it->entry_count) {
 595                 struct object *obj = parse_object(&it->oid);
 596                 if (!obj) {
 597                         error("%s: invalid sha1 pointer in cache-tree",
 598                               oid_to_hex(&it->oid));
 599                         errors_found |= ERROR_REFS;
 600                         return 1;
 601                 }
 602                 obj->flags |= USED;
 603                 if (name_objects)
 604                         add_decoration(fsck_walk_options.object_names,
 605                                 obj, xstrdup(":"));
 606                 mark_object_reachable(obj);
 607                 if (obj->type != OBJ_TREE)
 608                         err |= objerror(obj, "non-tree in cache-tree");
 609         }
 610         for (i = 0; i < it->subtree_nr; i++)
 611                 err |= fsck_cache_tree(it->down[i]->cache_tree);
 612         return err;
 613 }
 614
 615 static void mark_object_for_connectivity(const struct object_id *oid)
 616 {
 617         struct object *obj = lookup_unknown_object(oid->hash);
 618         obj->flags |= HAS_OBJ;
 619 }
 620
 621 static int mark_loose_for_connectivity(const struct object_id *oid,
 622                                        const char *path,
 623                                        void *data)
 624 {
 625         mark_object_for_connectivity(oid);
 626         return 0;
 627 }
 628
 629 static int mark_packed_for_connectivity(const struct object_id *oid,
 630                                         struct packed_git *pack,
 631                                         uint32_t pos,
 632                                         void *data)
 633 {
 634         mark_object_for_connectivity(oid);
 635         return 0;
 636 }
 637
 638 static char const * const fsck_usage[] = {
 639         N_("git fsck [<options>] [<object>...]"),
 640         NULL
 641 };
 642
 643 static struct option fsck_opts[] = {
 644         OPT__VERBOSE(&verbose, N_("be verbose")),
 645         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
 646         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
 647         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
 648         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
 649         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
 650         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
 651         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
 652         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
 653         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
 654         OPT_BOOL(0, "lost-found", &write_lost_and_found,
 655                                 N_("write dangling objects in .git/lost-found")),
 656         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 657         OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
 658         OPT_END(),
 659 };
 660
 661 int cmd_fsck(int argc, const char **argv, const char *prefix)
 662 {
 663         int i;
 664         struct alternate_object_database *alt;
 665
 666         errors_found = 0;
 667         check_replace_refs = 0;
 668
 669         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 670
 671         fsck_walk_options.walk = mark_object;
 672         fsck_obj_options.walk = mark_used;
 673         fsck_obj_options.error_func = fsck_error_func;
 674         if (check_strict)
 675                 fsck_obj_options.strict = 1;
 676
 677         if (show_progress == -1)
 678                 show_progress = isatty(2);
 679         if (verbose)
 680                 show_progress = 0;
 681
 682         if (write_lost_and_found) {
 683                 check_full = 1;
 684                 include_reflogs = 0;
 685         }
 686
 687         if (name_objects)
 688                 fsck_walk_options.object_names =
 689                         xcalloc(1, sizeof(struct decoration));
 690
 691         git_config(fsck_config, NULL);
 692
 693         fsck_head_link();
 694         if (connectivity_only) {
 695                 for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
 696                 for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
 697         } else {
 698                 fsck_object_dir(get_object_directory());
 699
 700                 prepare_alt_odb();
 701                 for (alt = alt_odb_list; alt; alt = alt->next)
 702                         fsck_object_dir(alt->path);
 703
 704                 if (check_full) {
 705                         struct packed_git *p;
 706                         uint32_t total = 0, count = 0;
 707                         struct progress *progress = NULL;
 708
 709                         prepare_packed_git();
 710
 711                         if (show_progress) {
 712                                 for (p = packed_git; p; p = p->next) {
 713                                         if (open_pack_index(p))
 714                                                 continue;
 715                                         total += p->num_objects;
 716                                 }
 717
 718                                 progress = start_progress(_("Checking objects"), total);
 719                         }
 720                         for (p = packed_git; p; p = p->next) {
 721                                 /* verify gives error messages itself */
 722                                 if (verify_pack(p, fsck_obj_buffer,
 723                                                 progress, count))
 724                                         errors_found |= ERROR_PACK;
 725                                 count += p->num_objects;
 726                         }
 727                         stop_progress(&progress);
 728                 }
 729         }
 730
 731         for (i = 0; i < argc; i++) {
 732                 const char *arg = argv[i];
 733                 unsigned char sha1[20];
 734                 if (!get_sha1(arg, sha1)) {
 735                         struct object *obj = lookup_object(sha1);
 736
 737                         if (!obj || !(obj->flags & HAS_OBJ)) {
 738                                 error("%s: object missing", sha1_to_hex(sha1));
 739                                 errors_found |= ERROR_OBJECT;
 740                                 continue;
 741                         }
 742
 743                         obj->flags |= USED;
 744                         if (name_objects)
 745                                 add_decoration(fsck_walk_options.object_names,
 746                                         obj, xstrdup(arg));
 747                         mark_object_reachable(obj);
 748                         continue;
 749                 }
 750                 error("invalid parameter: expected sha1, got '%s'", arg);
 751                 errors_found |= ERROR_OBJECT;
 752         }
 753
 754         /*
 755          * If we've not been given any explicit head information, do the
 756          * default ones from .git/refs. We also consider the index file
 757          * in this case (ie this implies --cache).
 758          */
 759         if (!argc) {
 760                 get_default_heads();
 761                 keep_cache_objects = 1;
 762         }
 763
 764         if (keep_cache_objects) {
 765                 verify_index_checksum = 1;
 766                 read_cache();
 767                 for (i = 0; i < active_nr; i++) {
 768                         unsigned int mode;
 769                         struct blob *blob;
 770                         struct object *obj;
 771
 772                         mode = active_cache[i]->ce_mode;
 773                         if (S_ISGITLINK(mode))
 774                                 continue;
 775                         blob = lookup_blob(&active_cache[i]->oid);
 776                         if (!blob)
 777                                 continue;
 778                         obj = &blob->object;
 779                         obj->flags |= USED;
 780                         if (name_objects)
 781                                 add_decoration(fsck_walk_options.object_names,
 782                                         obj,
 783                                         xstrfmt(":%s", active_cache[i]->name));
 784                         mark_object_reachable(obj);
 785                 }
 786                 if (active_cache_tree)
 787                         fsck_cache_tree(active_cache_tree);
 788         }
 789
 790         check_connectivity();
 791         return errors_found;
 792 }