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