builtin/fsck.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "commit.h"
   4 #include "tree.h"
   5 #include "blob.h"
   6 #include "tag.h"
   7 #include "refs.h"
   8 #include "pack.h"
   9 #include "cache-tree.h"
  10 #include "tree-walk.h"
  11 #include "fsck.h"
  12 #include "parse-options.h"
  13 #include "dir.h"
  14 #include "progress.h"
  15 #include "streaming.h"
  16 #include "decorate.h"
  17
  18 #define REACHABLE 0x0001
  19 #define SEEN      0x0002
  20 #define HAS_OBJ   0x0004
  21
  22 static int show_root;
  23 static int show_tags;
  24 static int show_unreachable;
  25 static int include_reflogs = 1;
  26 static int check_full = 1;
  27 static int connectivity_only;
  28 static int check_strict;
  29 static int keep_cache_objects;
  30 static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
  31 static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
  32 static struct object_id head_oid;
  33 static const char *head_points_at;
  34 static int errors_found;
  35 static int write_lost_and_found;
  36 static int verbose;
  37 static int show_progress = -1;
  38 static int show_dangling = 1;
  39 static int name_objects;
  40 #define ERROR_OBJECT 01
  41 #define ERROR_REACHABLE 02
  42 #define ERROR_PACK 04
  43 #define ERROR_REFS 010
  44
  45 static const char *describe_object(struct object *obj)
  46 {
  47         static struct strbuf buf = STRBUF_INIT;
  48         char *name = name_objects ?
  49                 lookup_decoration(fsck_walk_options.object_names, obj) : NULL;
  50
  51         strbuf_reset(&buf);
  52         strbuf_addstr(&buf, oid_to_hex(&obj->oid));
  53         if (name)
  54                 strbuf_addf(&buf, " (%s)", name);
  55
  56         return buf.buf;
  57 }
  58
  59 static const char *printable_type(struct object *obj)
  60 {
  61         const char *ret;
  62
  63         if (obj->type == OBJ_NONE) {
  64                 enum object_type type = sha1_object_info(obj->oid.hash, NULL);
  65                 if (type > 0)
  66                         object_as_type(obj, type, 0);
  67         }
  68
  69         ret = typename(obj->type);
  70         if (!ret)
  71                 ret = "unknown";
  72
  73         return ret;
  74 }
  75
  76 static int fsck_config(const char *var, const char *value, void *cb)
  77 {
  78         if (strcmp(var, "fsck.skiplist") == 0) {
  79                 const char *path;
  80                 struct strbuf sb = STRBUF_INIT;
  81
  82                 if (git_config_pathname(&path, var, value))
  83                         return 1;
  84                 strbuf_addf(&sb, "skiplist=%s", path);
  85                 free((char *)path);
  86                 fsck_set_msg_types(&fsck_obj_options, sb.buf);
  87                 strbuf_release(&sb);
  88                 return 0;
  89         }
  90
  91         if (skip_prefix(var, "fsck.", &var)) {
  92                 fsck_set_msg_type(&fsck_obj_options, var, value);
  93                 return 0;
  94         }
  95
  96         return git_default_config(var, value, cb);
  97 }
  98
  99 static void objreport(struct object *obj, const char *msg_type,
 100                         const char *err)
 101 {
 102         fprintf(stderr, "%s in %s %s: %s\n",
 103                 msg_type, printable_type(obj), describe_object(obj), err);
 104 }
 105
 106 static int objerror(struct object *obj, const char *err)
 107 {
 108         errors_found |= ERROR_OBJECT;
 109         objreport(obj, "error", err);
 110         return -1;
 111 }
 112
 113 static int fsck_error_func(struct fsck_options *o,
 114         struct object *obj, int type, const char *message)
 115 {
 116         objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message);
 117         return (type == FSCK_WARN) ? 0 : 1;
 118 }
 119
 120 static struct object_array pending;
 121
 122 static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
 123 {
 124         struct object *parent = data;
 125
 126         /*
 127          * The only case data is NULL or type is OBJ_ANY is when
 128          * mark_object_reachable() calls us.  All the callers of
 129          * that function has non-NULL obj hence ...
 130          */
 131         if (!obj) {
 132                 /* ... these references to parent->fld are safe here */
 133                 printf("broken link from %7s %s\n",
 134                            printable_type(parent), describe_object(parent));
 135                 printf("broken link from %7s %s\n",
 136                            (type == OBJ_ANY ? "unknown" : typename(type)), "unknown");
 137                 errors_found |= ERROR_REACHABLE;
 138                 return 1;
 139         }
 140
 141         if (type != OBJ_ANY && obj->type != type)
 142                 /* ... and the reference to parent is safe here */
 143                 objerror(parent, "wrong object type in link");
 144
 145         if (obj->flags & REACHABLE)
 146                 return 0;
 147         obj->flags |= REACHABLE;
 148         if (!(obj->flags & HAS_OBJ)) {
 149                 if (parent && !has_object_file(&obj->oid)) {
 150                         printf("broken link from %7s %s\n",
 151                                  printable_type(parent), describe_object(parent));
 152                         printf("              to %7s %s\n",
 153                                  printable_type(obj), describe_object(obj));
 154                         errors_found |= ERROR_REACHABLE;
 155                 }
 156                 return 1;
 157         }
 158
 159         add_object_array(obj, NULL, &pending);
 160         return 0;
 161 }
 162
 163 static void mark_object_reachable(struct object *obj)
 164 {
 165         mark_object(obj, OBJ_ANY, NULL, NULL);
 166 }
 167
 168 static int traverse_one_object(struct object *obj)
 169 {
 170         int result;
 171         struct tree *tree = NULL;
 172
 173         if (obj->type == OBJ_TREE) {
 174                 tree = (struct tree *)obj;
 175                 if (parse_tree(tree) < 0)
 176                         return 1; /* error already displayed */
 177         }
 178         result = fsck_walk(obj, obj, &fsck_walk_options);
 179         if (tree)
 180                 free_tree_buffer(tree);
 181         return result;
 182 }
 183
 184 static int traverse_reachable(void)
 185 {
 186         struct progress *progress = NULL;
 187         unsigned int nr = 0;
 188         int result = 0;
 189         if (show_progress)
 190                 progress = start_progress_delay(_("Checking connectivity"), 0, 0, 2);
 191         while (pending.nr) {
 192                 struct object_array_entry *entry;
 193                 struct object *obj;
 194
 195                 entry = pending.objects + --pending.nr;
 196                 obj = entry->item;
 197                 result |= traverse_one_object(obj);
 198                 display_progress(progress, ++nr);
 199         }
 200         stop_progress(&progress);
 201         return !!result;
 202 }
 203
 204 static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
 205 {
 206         if (!obj)
 207                 return 1;
 208         obj->used = 1;
 209         return 0;
 210 }
 211
 212 /*
 213  * Check a single reachable object
 214  */
 215 static void check_reachable_object(struct object *obj)
 216 {
 217         /*
 218          * We obviously want the object to be parsed,
 219          * except if it was in a pack-file and we didn't
 220          * do a full fsck
 221          */
 222         if (!(obj->flags & HAS_OBJ)) {
 223                 if (has_sha1_pack(obj->oid.hash))
 224                         return; /* it is in pack - forget about it */
 225                 printf("missing %s %s\n", printable_type(obj),
 226                         describe_object(obj));
 227                 errors_found |= ERROR_REACHABLE;
 228                 return;
 229         }
 230 }
 231
 232 /*
 233  * Check a single unreachable object
 234  */
 235 static void check_unreachable_object(struct object *obj)
 236 {
 237         /*
 238          * Missing unreachable object? Ignore it. It's not like
 239          * we miss it (since it can't be reached), nor do we want
 240          * to complain about it being unreachable (since it does
 241          * not exist).
 242          */
 243         if (!(obj->flags & HAS_OBJ))
 244                 return;
 245
 246         /*
 247          * Unreachable object that exists? Show it if asked to,
 248          * since this is something that is prunable.
 249          */
 250         if (show_unreachable) {
 251                 printf("unreachable %s %s\n", printable_type(obj),
 252                         describe_object(obj));
 253                 return;
 254         }
 255
 256         /*
 257          * "!used" means that nothing at all points to it, including
 258          * other unreachable objects. In other words, it's the "tip"
 259          * of some set of unreachable objects, usually a commit that
 260          * got dropped.
 261          *
 262          * Such starting points are more interesting than some random
 263          * set of unreachable objects, so we show them even if the user
 264          * hasn't asked for _all_ unreachable objects. If you have
 265          * deleted a branch by mistake, this is a prime candidate to
 266          * start looking at, for example.
 267          */
 268         if (!obj->used) {
 269                 if (show_dangling)
 270                         printf("dangling %s %s\n", printable_type(obj),
 271                                describe_object(obj));
 272                 if (write_lost_and_found) {
 273                         char *filename = git_pathdup("lost-found/%s/%s",
 274                                 obj->type == OBJ_COMMIT ? "commit" : "other",
 275                                 describe_object(obj));
 276                         FILE *f;
 277
 278                         if (safe_create_leading_directories_const(filename)) {
 279                                 error("Could not create lost-found");
 280                                 free(filename);
 281                                 return;
 282                         }
 283                         if (!(f = fopen(filename, "w")))
 284                                 die_errno("Could not open '%s'", filename);
 285                         if (obj->type == OBJ_BLOB) {
 286                                 if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
 287                                         die_errno("Could not write '%s'", filename);
 288                         } else
 289                                 fprintf(f, "%s\n", describe_object(obj));
 290                         if (fclose(f))
 291                                 die_errno("Could not finish '%s'",
 292                                           filename);
 293                         free(filename);
 294                 }
 295                 return;
 296         }
 297
 298         /*
 299          * Otherwise? It's there, it's unreachable, and some other unreachable
 300          * object points to it. Ignore it - it's not interesting, and we showed
 301          * all the interesting cases above.
 302          */
 303 }
 304
 305 static void check_object(struct object *obj)
 306 {
 307         if (verbose)
 308                 fprintf(stderr, "Checking %s\n", describe_object(obj));
 309
 310         if (obj->flags & REACHABLE)
 311                 check_reachable_object(obj);
 312         else
 313                 check_unreachable_object(obj);
 314 }
 315
 316 static void check_connectivity(void)
 317 {
 318         int i, max;
 319
 320         /* Traverse the pending reachable objects */
 321         traverse_reachable();
 322
 323         /* Look up all the requirements, warn about missing objects.. */
 324         max = get_max_object_index();
 325         if (verbose)
 326                 fprintf(stderr, "Checking connectivity (%d objects)\n", max);
 327
 328         for (i = 0; i < max; i++) {
 329                 struct object *obj = get_indexed_object(i);
 330
 331                 if (obj)
 332                         check_object(obj);
 333         }
 334 }
 335
 336 static int fsck_obj(struct object *obj)
 337 {
 338         if (obj->flags & SEEN)
 339                 return 0;
 340         obj->flags |= SEEN;
 341
 342         if (verbose)
 343                 fprintf(stderr, "Checking %s %s\n",
 344                         printable_type(obj), describe_object(obj));
 345
 346         if (fsck_walk(obj, NULL, &fsck_obj_options))
 347                 objerror(obj, "broken links");
 348         if (fsck_object(obj, NULL, 0, &fsck_obj_options))
 349                 return -1;
 350
 351         if (obj->type == OBJ_TREE) {
 352                 struct tree *item = (struct tree *) obj;
 353
 354                 free_tree_buffer(item);
 355         }
 356
 357         if (obj->type == OBJ_COMMIT) {
 358                 struct commit *commit = (struct commit *) obj;
 359
 360                 free_commit_buffer(commit);
 361
 362                 if (!commit->parents && show_root)
 363                         printf("root %s\n", describe_object(&commit->object));
 364         }
 365
 366         if (obj->type == OBJ_TAG) {
 367                 struct tag *tag = (struct tag *) obj;
 368
 369                 if (show_tags && tag->tagged) {
 370                         printf("tagged %s %s", printable_type(tag->tagged),
 371                                 describe_object(tag->tagged));
 372                         printf(" (%s) in %s\n", tag->tag,
 373                                 describe_object(&tag->object));
 374                 }
 375         }
 376
 377         return 0;
 378 }
 379
 380 static int fsck_obj_buffer(const unsigned char *sha1, enum object_type type,
 381                            unsigned long size, void *buffer, int *eaten)
 382 {
 383         /*
 384          * Note, buffer may be NULL if type is OBJ_BLOB. See
 385          * verify_packfile(), data_valid variable for details.
 386          */
 387         struct object *obj;
 388         obj = parse_object_buffer(sha1, type, size, buffer, eaten);
 389         if (!obj) {
 390                 errors_found |= ERROR_OBJECT;
 391                 return error("%s: object corrupt or missing", sha1_to_hex(sha1));
 392         }
 393         obj->flags = HAS_OBJ;
 394         return fsck_obj(obj);
 395 }
 396
 397 static int default_refs;
 398
 399 static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
 400         unsigned long timestamp)
 401 {
 402         struct object *obj;
 403
 404         if (!is_null_oid(oid)) {
 405                 obj = lookup_object(oid->hash);
 406                 if (obj && (obj->flags & HAS_OBJ)) {
 407                         if (timestamp && name_objects)
 408                                 add_decoration(fsck_walk_options.object_names,
 409                                         obj,
 410                                         xstrfmt("%s@{%ld}", refname, timestamp));
 411                         obj->used = 1;
 412                         mark_object_reachable(obj);
 413                 } else {
 414                         error("%s: invalid reflog entry %s", refname, oid_to_hex(oid));
 415                         errors_found |= ERROR_REACHABLE;
 416                 }
 417         }
 418 }
 419
 420 static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid,
 421                 const char *email, unsigned long timestamp, int tz,
 422                 const char *message, void *cb_data)
 423 {
 424         const char *refname = cb_data;
 425
 426         if (verbose)
 427                 fprintf(stderr, "Checking reflog %s->%s\n",
 428                         oid_to_hex(ooid), oid_to_hex(noid));
 429
 430         fsck_handle_reflog_oid(refname, ooid, 0);
 431         fsck_handle_reflog_oid(refname, noid, timestamp);
 432         return 0;
 433 }
 434
 435 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
 436                               int flag, void *cb_data)
 437 {
 438         for_each_reflog_ent(logname, fsck_handle_reflog_ent, (void *)logname);
 439         return 0;
 440 }
 441
 442 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 443                            int flag, void *cb_data)
 444 {
 445         struct object *obj;
 446
 447         obj = parse_object(oid->hash);
 448         if (!obj) {
 449                 error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
 450                 errors_found |= ERROR_REACHABLE;
 451                 /* We'll continue with the rest despite the error.. */
 452                 return 0;
 453         }
 454         if (obj->type != OBJ_COMMIT && is_branch(refname)) {
 455                 error("%s: not a commit", refname);
 456                 errors_found |= ERROR_REFS;
 457         }
 458         default_refs++;
 459         obj->used = 1;
 460         if (name_objects)
 461                 add_decoration(fsck_walk_options.object_names,
 462                         obj, xstrdup(refname));
 463         mark_object_reachable(obj);
 464
 465         return 0;
 466 }
 467
 468 static void get_default_heads(void)
 469 {
 470         if (head_points_at && !is_null_oid(&head_oid))
 471                 fsck_handle_ref("HEAD", &head_oid, 0, NULL);
 472         for_each_rawref(fsck_handle_ref, NULL);
 473         if (include_reflogs)
 474                 for_each_reflog(fsck_handle_reflog, NULL);
 475
 476         /*
 477          * Not having any default heads isn't really fatal, but
 478          * it does mean that "--unreachable" no longer makes any
 479          * sense (since in this case everything will obviously
 480          * be unreachable by definition.
 481          *
 482          * Showing dangling objects is valid, though (as those
 483          * dangling objects are likely lost heads).
 484          *
 485          * So we just print a warning about it, and clear the
 486          * "show_unreachable" flag.
 487          */
 488         if (!default_refs) {
 489                 fprintf(stderr, "notice: No default references\n");
 490                 show_unreachable = 0;
 491         }
 492 }
 493
 494 static struct object *parse_loose_object(const struct object_id *oid,
 495                                          const char *path)
 496 {
 497         struct object *obj;
 498         void *contents;
 499         enum object_type type;
 500         unsigned long size;
 501         int eaten;
 502
 503         if (read_loose_object(path, oid->hash, &type, &size, &contents) < 0)
 504                 return NULL;
 505
 506         if (!contents && type != OBJ_BLOB)
 507                 die("BUG: read_loose_object streamed a non-blob");
 508
 509         obj = parse_object_buffer(oid->hash, type, size, contents, &eaten);
 510
 511         if (!eaten)
 512                 free(contents);
 513         return obj;
 514 }
 515
 516 static int fsck_loose(const struct object_id *oid, const char *path, void *data)
 517 {
 518         struct object *obj = parse_loose_object(oid, path);
 519
 520         if (!obj) {
 521                 errors_found |= ERROR_OBJECT;
 522                 error("%s: object corrupt or missing: %s",
 523                       oid_to_hex(oid), path);
 524                 return 0; /* keep checking other objects */
 525         }
 526
 527         obj->flags = HAS_OBJ;
 528         if (fsck_obj(obj))
 529                 errors_found |= ERROR_OBJECT;
 530         return 0;
 531 }
 532
 533 static int fsck_cruft(const char *basename, const char *path, void *data)
 534 {
 535         if (!starts_with(basename, "tmp_obj_"))
 536                 fprintf(stderr, "bad sha1 file: %s\n", path);
 537         return 0;
 538 }
 539
 540 static int fsck_subdir(int nr, const char *path, void *progress)
 541 {
 542         display_progress(progress, nr + 1);
 543         return 0;
 544 }
 545
 546 static void fsck_object_dir(const char *path)
 547 {
 548         struct progress *progress = NULL;
 549
 550         if (verbose)
 551                 fprintf(stderr, "Checking object directory\n");
 552
 553         if (show_progress)
 554                 progress = start_progress(_("Checking object directories"), 256);
 555
 556         for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
 557                                       progress);
 558         display_progress(progress, 256);
 559         stop_progress(&progress);
 560 }
 561
 562 static int fsck_head_link(void)
 563 {
 564         int null_is_error = 0;
 565
 566         if (verbose)
 567                 fprintf(stderr, "Checking HEAD link\n");
 568
 569         head_points_at = resolve_ref_unsafe("HEAD", 0, head_oid.hash, NULL);
 570         if (!head_points_at) {
 571                 errors_found |= ERROR_REFS;
 572                 return error("Invalid HEAD");
 573         }
 574         if (!strcmp(head_points_at, "HEAD"))
 575                 /* detached HEAD */
 576                 null_is_error = 1;
 577         else if (!starts_with(head_points_at, "refs/heads/")) {
 578                 errors_found |= ERROR_REFS;
 579                 return error("HEAD points to something strange (%s)",
 580                              head_points_at);
 581         }
 582         if (is_null_oid(&head_oid)) {
 583                 if (null_is_error) {
 584                         errors_found |= ERROR_REFS;
 585                         return error("HEAD: detached HEAD points at nothing");
 586                 }
 587                 fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
 588                         head_points_at + 11);
 589         }
 590         return 0;
 591 }
 592
 593 static int fsck_cache_tree(struct cache_tree *it)
 594 {
 595         int i;
 596         int err = 0;
 597
 598         if (verbose)
 599                 fprintf(stderr, "Checking cache tree\n");
 600
 601         if (0 <= it->entry_count) {
 602                 struct object *obj = parse_object(it->sha1);
 603                 if (!obj) {
 604                         error("%s: invalid sha1 pointer in cache-tree",
 605                               sha1_to_hex(it->sha1));
 606                         errors_found |= ERROR_REFS;
 607                         return 1;
 608                 }
 609                 obj->used = 1;
 610                 if (name_objects)
 611                         add_decoration(fsck_walk_options.object_names,
 612                                 obj, xstrdup(":"));
 613                 mark_object_reachable(obj);
 614                 if (obj->type != OBJ_TREE)
 615                         err |= objerror(obj, "non-tree in cache-tree");
 616         }
 617         for (i = 0; i < it->subtree_nr; i++)
 618                 err |= fsck_cache_tree(it->down[i]->cache_tree);
 619         return err;
 620 }
 621
 622 static void mark_object_for_connectivity(const struct object_id *oid)
 623 {
 624         struct object *obj = lookup_unknown_object(oid->hash);
 625         obj->flags |= HAS_OBJ;
 626 }
 627
 628 static int mark_loose_for_connectivity(const struct object_id *oid,
 629                                        const char *path,
 630                                        void *data)
 631 {
 632         mark_object_for_connectivity(oid);
 633         return 0;
 634 }
 635
 636 static int mark_packed_for_connectivity(const struct object_id *oid,
 637                                         struct packed_git *pack,
 638                                         uint32_t pos,
 639                                         void *data)
 640 {
 641         mark_object_for_connectivity(oid);
 642         return 0;
 643 }
 644
 645 static char const * const fsck_usage[] = {
 646         N_("git fsck [<options>] [<object>...]"),
 647         NULL
 648 };
 649
 650 static struct option fsck_opts[] = {
 651         OPT__VERBOSE(&verbose, N_("be verbose")),
 652         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
 653         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
 654         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
 655         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
 656         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
 657         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
 658         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
 659         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
 660         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
 661         OPT_BOOL(0, "lost-found", &write_lost_and_found,
 662                                 N_("write dangling objects in .git/lost-found")),
 663         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 664         OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
 665         OPT_END(),
 666 };
 667
 668 int cmd_fsck(int argc, const char **argv, const char *prefix)
 669 {
 670         int i, heads;
 671         struct alternate_object_database *alt;
 672
 673         errors_found = 0;
 674         check_replace_refs = 0;
 675
 676         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 677
 678         fsck_walk_options.walk = mark_object;
 679         fsck_obj_options.walk = mark_used;
 680         fsck_obj_options.error_func = fsck_error_func;
 681         if (check_strict)
 682                 fsck_obj_options.strict = 1;
 683
 684         if (show_progress == -1)
 685                 show_progress = isatty(2);
 686         if (verbose)
 687                 show_progress = 0;
 688
 689         if (write_lost_and_found) {
 690                 check_full = 1;
 691                 include_reflogs = 0;
 692         }
 693
 694         if (name_objects)
 695                 fsck_walk_options.object_names =
 696                         xcalloc(1, sizeof(struct decoration));
 697
 698         git_config(fsck_config, NULL);
 699
 700         fsck_head_link();
 701         if (connectivity_only) {
 702                 for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
 703                 for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
 704         } else {
 705                 fsck_object_dir(get_object_directory());
 706
 707                 prepare_alt_odb();
 708                 for (alt = alt_odb_list; alt; alt = alt->next)
 709                         fsck_object_dir(alt->path);
 710
 711                 if (check_full) {
 712                         struct packed_git *p;
 713                         uint32_t total = 0, count = 0;
 714                         struct progress *progress = NULL;
 715
 716                         prepare_packed_git();
 717
 718                         if (show_progress) {
 719                                 for (p = packed_git; p; p = p->next) {
 720                                         if (open_pack_index(p))
 721                                                 continue;
 722                                         total += p->num_objects;
 723                                 }
 724
 725                                 progress = start_progress(_("Checking objects"), total);
 726                         }
 727                         for (p = packed_git; p; p = p->next) {
 728                                 /* verify gives error messages itself */
 729                                 if (verify_pack(p, fsck_obj_buffer,
 730                                                 progress, count))
 731                                         errors_found |= ERROR_PACK;
 732                                 count += p->num_objects;
 733                         }
 734                         stop_progress(&progress);
 735                 }
 736         }
 737
 738         heads = 0;
 739         for (i = 0; i < argc; i++) {
 740                 const char *arg = argv[i];
 741                 unsigned char sha1[20];
 742                 if (!get_sha1(arg, sha1)) {
 743                         struct object *obj = lookup_object(sha1);
 744
 745                         if (!obj || !(obj->flags & HAS_OBJ)) {
 746                                 error("%s: object missing", sha1_to_hex(sha1));
 747                                 errors_found |= ERROR_OBJECT;
 748                                 continue;
 749                         }
 750
 751                         obj->used = 1;
 752                         if (name_objects)
 753                                 add_decoration(fsck_walk_options.object_names,
 754                                         obj, xstrdup(arg));
 755                         mark_object_reachable(obj);
 756                         heads++;
 757                         continue;
 758                 }
 759                 error("invalid parameter: expected sha1, got '%s'", arg);
 760                 errors_found |= ERROR_OBJECT;
 761         }
 762
 763         /*
 764          * If we've not been given any explicit head information, do the
 765          * default ones from .git/refs. We also consider the index file
 766          * in this case (ie this implies --cache).
 767          */
 768         if (!argc) {
 769                 get_default_heads();
 770                 keep_cache_objects = 1;
 771         }
 772
 773         if (keep_cache_objects) {
 774                 verify_index_checksum = 1;
 775                 read_cache();
 776                 for (i = 0; i < active_nr; i++) {
 777                         unsigned int mode;
 778                         struct blob *blob;
 779                         struct object *obj;
 780
 781                         mode = active_cache[i]->ce_mode;
 782                         if (S_ISGITLINK(mode))
 783                                 continue;
 784                         blob = lookup_blob(active_cache[i]->oid.hash);
 785                         if (!blob)
 786                                 continue;
 787                         obj = &blob->object;
 788                         obj->used = 1;
 789                         if (name_objects)
 790                                 add_decoration(fsck_walk_options.object_names,
 791                                         obj,
 792                                         xstrfmt(":%s", active_cache[i]->name));
 793                         mark_object_reachable(obj);
 794                 }
 795                 if (active_cache_tree)
 796                         fsck_cache_tree(active_cache_tree);
 797         }
 798
 799         check_connectivity();
 800         return errors_found;
 801 }