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