builtin/fsck.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "config.h"
   4 #include "commit.h"
   5 #include "tree.h"
   6 #include "blob.h"
   7 #include "tag.h"
   8 #include "refs.h"
   9 #include "pack.h"
  10 #include "cache-tree.h"
  11 #include "tree-walk.h"
  12 #include "fsck.h"
  13 #include "parse-options.h"
  14 #include "dir.h"
  15 #include "progress.h"
  16 #include "streaming.h"
  17 #include "decorate.h"
  18
  19 #define REACHABLE 0x0001
  20 #define SEEN      0x0002
  21 #define HAS_OBJ   0x0004
  22 /* This flag is set if something points to this object. */
  23 #define USED      0x0008
  24
  25 static int show_root;
  26 static int show_tags;
  27 static int show_unreachable;
  28 static int include_reflogs = 1;
  29 static int check_full = 1;
  30 static int connectivity_only;
  31 static int check_strict;
  32 static int keep_cache_objects;
  33 static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
  34 static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
  35 static struct object_id head_oid;
  36 static const char *head_points_at;
  37 static int errors_found;
  38 static int write_lost_and_found;
  39 static int verbose;
  40 static int show_progress = -1;
  41 static int show_dangling = 1;
  42 static int name_objects;
  43 #define ERROR_OBJECT 01
  44 #define ERROR_REACHABLE 02
  45 #define ERROR_PACK 04
  46 #define ERROR_REFS 010
  47
  48 static const char *describe_object(struct object *obj)
  49 {
  50         static struct strbuf buf = STRBUF_INIT;
  51         char *name = name_objects ?
  52                 lookup_decoration(fsck_walk_options.object_names, obj) : NULL;
  53
  54         strbuf_reset(&buf);
  55         strbuf_addstr(&buf, oid_to_hex(&obj->oid));
  56         if (name)
  57                 strbuf_addf(&buf, " (%s)", name);
  58
  59         return buf.buf;
  60 }
  61
  62 static const char *printable_type(struct object *obj)
  63 {
  64         const char *ret;
  65
  66         if (obj->type == OBJ_NONE) {
  67                 enum object_type type = sha1_object_info(obj->oid.hash, NULL);
  68                 if (type > 0)
  69                         object_as_type(obj, type, 0);
  70         }
  71
  72         ret = typename(obj->type);
  73         if (!ret)
  74                 ret = "unknown";
  75
  76         return ret;
  77 }
  78
  79 static int fsck_config(const char *var, const char *value, void *cb)
  80 {
  81         if (strcmp(var, "fsck.skiplist") == 0) {
  82                 const char *path;
  83                 struct strbuf sb = STRBUF_INIT;
  84
  85                 if (git_config_pathname(&path, var, value))
  86                         return 1;
  87                 strbuf_addf(&sb, "skiplist=%s", path);
  88                 free((char *)path);
  89                 fsck_set_msg_types(&fsck_obj_options, sb.buf);
  90                 strbuf_release(&sb);
  91                 return 0;
  92         }
  93
  94         if (skip_prefix(var, "fsck.", &var)) {
  95                 fsck_set_msg_type(&fsck_obj_options, var, value);
  96                 return 0;
  97         }
  98
  99         return git_default_config(var, value, cb);
 100 }
 101
 102 static void objreport(struct object *obj, const char *msg_type,
 103                         const char *err)
 104 {
 105         fprintf(stderr, "%s in %s %s: %s\n",
 106                 msg_type, printable_type(obj), describe_object(obj), err);
 107 }
 108
 109 static int objerror(struct object *obj, const char *err)
 110 {
 111         errors_found |= ERROR_OBJECT;
 112         objreport(obj, "error", err);
 113         return -1;
 114 }
 115
 116 static int fsck_error_func(struct fsck_options *o,
 117         struct object *obj, int type, const char *message)
 118 {
 119         objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message);
 120         return (type == FSCK_WARN) ? 0 : 1;
 121 }
 122
 123 static struct object_array pending;
 124
 125 static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
 126 {
 127         struct object *parent = data;
 128
 129         /*
 130          * The only case data is NULL or type is OBJ_ANY is when
 131          * mark_object_reachable() calls us.  All the callers of
 132          * that function has non-NULL obj hence ...
 133          */
 134         if (!obj) {
 135                 /* ... these references to parent->fld are safe here */
 136                 printf("broken link from %7s %s\n",
 137                            printable_type(parent), describe_object(parent));
 138                 printf("broken link from %7s %s\n",
 139                            (type == OBJ_ANY ? "unknown" : typename(type)), "unknown");
 140                 errors_found |= ERROR_REACHABLE;
 141                 return 1;
 142         }
 143
 144         if (type != OBJ_ANY && obj->type != type)
 145                 /* ... and the reference to parent is safe here */
 146                 objerror(parent, "wrong object type in link");
 147
 148         if (obj->flags & REACHABLE)
 149                 return 0;
 150         obj->flags |= REACHABLE;
 151         if (!(obj->flags & HAS_OBJ)) {
 152                 if (parent && !has_object_file(&obj->oid)) {
 153                         printf("broken link from %7s %s\n",
 154                                  printable_type(parent), describe_object(parent));
 155                         printf("              to %7s %s\n",
 156                                  printable_type(obj), describe_object(obj));
 157                         errors_found |= ERROR_REACHABLE;
 158                 }
 159                 return 1;
 160         }
 161
 162         add_object_array(obj, NULL, &pending);
 163         return 0;
 164 }
 165
 166 static void mark_object_reachable(struct object *obj)
 167 {
 168         mark_object(obj, OBJ_ANY, NULL, NULL);
 169 }
 170
 171 static int traverse_one_object(struct object *obj)
 172 {
 173         int result = fsck_walk(obj, obj, &fsck_walk_options);
 174
 175         if (obj->type == OBJ_TREE) {
 176                 struct tree *tree = (struct tree *)obj;
 177                 free_tree_buffer(tree);
 178         }
 179         return result;
 180 }
 181
 182 static int traverse_reachable(void)
 183 {
 184         struct progress *progress = NULL;
 185         unsigned int nr = 0;
 186         int result = 0;
 187         if (show_progress)
 188                 progress = start_progress_delay(_("Checking connectivity"), 0, 0, 2);
 189         while (pending.nr) {
 190                 struct object_array_entry *entry;
 191                 struct object *obj;
 192
 193                 entry = pending.objects + --pending.nr;
 194                 obj = entry->item;
 195                 result |= traverse_one_object(obj);
 196                 display_progress(progress, ++nr);
 197         }
 198         stop_progress(&progress);
 199         return !!result;
 200 }
 201
 202 static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
 203 {
 204         if (!obj)
 205                 return 1;
 206         obj->flags |= USED;
 207         return 0;
 208 }
 209
 210 /*
 211  * Check a single reachable object
 212  */
 213 static void check_reachable_object(struct object *obj)
 214 {
 215         /*
 216          * We obviously want the object to be parsed,
 217          * except if it was in a pack-file and we didn't
 218          * do a full fsck
 219          */
 220         if (!(obj->flags & HAS_OBJ)) {
 221                 if (has_sha1_pack(obj->oid.hash))
 222                         return; /* it is in pack - forget about it */
 223                 printf("missing %s %s\n", printable_type(obj),
 224                         describe_object(obj));
 225                 errors_found |= ERROR_REACHABLE;
 226                 return;
 227         }
 228 }
 229
 230 /*
 231  * Check a single unreachable object
 232  */
 233 static void check_unreachable_object(struct object *obj)
 234 {
 235         /*
 236          * Missing unreachable object? Ignore it. It's not like
 237          * we miss it (since it can't be reached), nor do we want
 238          * to complain about it being unreachable (since it does
 239          * not exist).
 240          */
 241         if (!(obj->flags & HAS_OBJ))
 242                 return;
 243
 244         /*
 245          * Unreachable object that exists? Show it if asked to,
 246          * since this is something that is prunable.
 247          */
 248         if (show_unreachable) {
 249                 printf("unreachable %s %s\n", printable_type(obj),
 250                         describe_object(obj));
 251                 return;
 252         }
 253
 254         /*
 255          * "!USED" means that nothing at all points to it, including
 256          * other unreachable objects. In other words, it's the "tip"
 257          * of some set of unreachable objects, usually a commit that
 258          * got dropped.
 259          *
 260          * Such starting points are more interesting than some random
 261          * set of unreachable objects, so we show them even if the user
 262          * hasn't asked for _all_ unreachable objects. If you have
 263          * deleted a branch by mistake, this is a prime candidate to
 264          * start looking at, for example.
 265          */
 266         if (!(obj->flags & USED)) {
 267                 if (show_dangling)
 268                         printf("dangling %s %s\n", printable_type(obj),
 269                                describe_object(obj));
 270                 if (write_lost_and_found) {
 271                         char *filename = git_pathdup("lost-found/%s/%s",
 272                                 obj->type == OBJ_COMMIT ? "commit" : "other",
 273                                 describe_object(obj));
 274                         FILE *f;
 275
 276                         if (safe_create_leading_directories_const(filename)) {
 277                                 error("Could not create lost-found");
 278                                 free(filename);
 279                                 return;
 280                         }
 281                         f = xfopen(filename, "w");
 282                         if (obj->type == OBJ_BLOB) {
 283                                 if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
 284                                         die_errno("Could not write '%s'", filename);
 285                         } else
 286                                 fprintf(f, "%s\n", describe_object(obj));
 287                         if (fclose(f))
 288                                 die_errno("Could not finish '%s'",
 289                                           filename);
 290                         free(filename);
 291                 }
 292                 return;
 293         }
 294
 295         /*
 296          * Otherwise? It's there, it's unreachable, and some other unreachable
 297          * object points to it. Ignore it - it's not interesting, and we showed
 298          * all the interesting cases above.
 299          */
 300 }
 301
 302 static void check_object(struct object *obj)
 303 {
 304         if (verbose)
 305                 fprintf(stderr, "Checking %s\n", describe_object(obj));
 306
 307         if (obj->flags & REACHABLE)
 308                 check_reachable_object(obj);
 309         else
 310                 check_unreachable_object(obj);
 311 }
 312
 313 static void check_connectivity(void)
 314 {
 315         int i, max;
 316
 317         /* Traverse the pending reachable objects */
 318         traverse_reachable();
 319
 320         /* Look up all the requirements, warn about missing objects.. */
 321         max = get_max_object_index();
 322         if (verbose)
 323                 fprintf(stderr, "Checking connectivity (%d objects)\n", max);
 324
 325         for (i = 0; i < max; i++) {
 326                 struct object *obj = get_indexed_object(i);
 327
 328                 if (obj)
 329                         check_object(obj);
 330         }
 331 }
 332
 333 static int fsck_obj(struct object *obj)
 334 {
 335         if (obj->flags & SEEN)
 336                 return 0;
 337         obj->flags |= SEEN;
 338
 339         if (verbose)
 340                 fprintf(stderr, "Checking %s %s\n",
 341                         printable_type(obj), describe_object(obj));
 342
 343         if (fsck_walk(obj, NULL, &fsck_obj_options))
 344                 objerror(obj, "broken links");
 345         if (fsck_object(obj, NULL, 0, &fsck_obj_options))
 346                 return -1;
 347
 348         if (obj->type == OBJ_TREE) {
 349                 struct tree *item = (struct tree *) obj;
 350
 351                 free_tree_buffer(item);
 352         }
 353
 354         if (obj->type == OBJ_COMMIT) {
 355                 struct commit *commit = (struct commit *) obj;
 356
 357                 free_commit_buffer(commit);
 358
 359                 if (!commit->parents && show_root)
 360                         printf("root %s\n", describe_object(&commit->object));
 361         }
 362
 363         if (obj->type == OBJ_TAG) {
 364                 struct tag *tag = (struct tag *) obj;
 365
 366                 if (show_tags && tag->tagged) {
 367                         printf("tagged %s %s", printable_type(tag->tagged),
 368                                 describe_object(tag->tagged));
 369                         printf(" (%s) in %s\n", tag->tag,
 370                                 describe_object(&tag->object));
 371                 }
 372         }
 373
 374         return 0;
 375 }
 376
 377 static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
 378                            unsigned long size, void *buffer, int *eaten)
 379 {
 380         /*
 381          * Note, buffer may be NULL if type is OBJ_BLOB. See
 382          * verify_packfile(), data_valid variable for details.
 383          */
 384         struct object *obj;
 385         obj = parse_object_buffer(oid, type, size, buffer, eaten);
 386         if (!obj) {
 387                 errors_found |= ERROR_OBJECT;
 388                 return error("%s: object corrupt or missing", oid_to_hex(oid));
 389         }
 390         obj->flags &= ~(REACHABLE | SEEN);
 391         obj->flags |= HAS_OBJ;
 392         return fsck_obj(obj);
 393 }
 394
 395 static int default_refs;
 396
 397 static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
 398         timestamp_t timestamp)
 399 {
 400         struct object *obj;
 401
 402         if (!is_null_oid(oid)) {
 403                 obj = lookup_object(oid->hash);
 404                 if (obj && (obj->flags & HAS_OBJ)) {
 405                         if (timestamp && name_objects)
 406                                 add_decoration(fsck_walk_options.object_names,
 407                                         obj,
 408                                         xstrfmt("%s@{%"PRItime"}", refname, timestamp));
 409                         obj->flags |= USED;
 410                         mark_object_reachable(obj);
 411                 } else {
 412                         error("%s: invalid reflog entry %s", refname, oid_to_hex(oid));
 413                         errors_found |= ERROR_REACHABLE;
 414                 }
 415         }
 416 }
 417
 418 static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid,
 419                 const char *email, timestamp_t timestamp, int tz,
 420                 const char *message, void *cb_data)
 421 {
 422         const char *refname = cb_data;
 423
 424         if (verbose)
 425                 fprintf(stderr, "Checking reflog %s->%s\n",
 426                         oid_to_hex(ooid), oid_to_hex(noid));
 427
 428         fsck_handle_reflog_oid(refname, ooid, 0);
 429         fsck_handle_reflog_oid(refname, noid, timestamp);
 430         return 0;
 431 }
 432
 433 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
 434                               int flag, void *cb_data)
 435 {
 436         for_each_reflog_ent(logname, fsck_handle_reflog_ent, (void *)logname);
 437         return 0;
 438 }
 439
 440 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 441                            int flag, void *cb_data)
 442 {
 443         struct object *obj;
 444
 445         obj = parse_object(oid);
 446         if (!obj) {
 447                 error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
 448                 errors_found |= ERROR_REACHABLE;
 449                 /* We'll continue with the rest despite the error.. */
 450                 return 0;
 451         }
 452         if (obj->type != OBJ_COMMIT && is_branch(refname)) {
 453                 error("%s: not a commit", refname);
 454                 errors_found |= ERROR_REFS;
 455         }
 456         default_refs++;
 457         obj->flags |= USED;
 458         if (name_objects)
 459                 add_decoration(fsck_walk_options.object_names,
 460                         obj, xstrdup(refname));
 461         mark_object_reachable(obj);
 462
 463         return 0;
 464 }
 465
 466 static void get_default_heads(void)
 467 {
 468         if (head_points_at && !is_null_oid(&head_oid))
 469                 fsck_handle_ref("HEAD", &head_oid, 0, NULL);
 470         for_each_rawref(fsck_handle_ref, NULL);
 471         if (include_reflogs)
 472                 for_each_reflog(fsck_handle_reflog, NULL);
 473
 474         /*
 475          * Not having any default heads isn't really fatal, but
 476          * it does mean that "--unreachable" no longer makes any
 477          * sense (since in this case everything will obviously
 478          * be unreachable by definition.
 479          *
 480          * Showing dangling objects is valid, though (as those
 481          * dangling objects are likely lost heads).
 482          *
 483          * So we just print a warning about it, and clear the
 484          * "show_unreachable" flag.
 485          */
 486         if (!default_refs) {
 487                 fprintf(stderr, "notice: No default references\n");
 488                 show_unreachable = 0;
 489         }
 490 }
 491
 492 static struct object *parse_loose_object(const struct object_id *oid,
 493                                          const char *path)
 494 {
 495         struct object *obj;
 496         void *contents;
 497         enum object_type type;
 498         unsigned long size;
 499         int eaten;
 500
 501         if (read_loose_object(path, oid->hash, &type, &size, &contents) < 0)
 502                 return NULL;
 503
 504         if (!contents && type != OBJ_BLOB)
 505                 die("BUG: read_loose_object streamed a non-blob");
 506
 507         obj = parse_object_buffer(oid, type, size, contents, &eaten);
 508
 509         if (!eaten)
 510                 free(contents);
 511         return obj;
 512 }
 513
 514 static int fsck_loose(const struct object_id *oid, const char *path, void *data)
 515 {
 516         struct object *obj = parse_loose_object(oid, path);
 517
 518         if (!obj) {
 519                 errors_found |= ERROR_OBJECT;
 520                 error("%s: object corrupt or missing: %s",
 521                       oid_to_hex(oid), path);
 522                 return 0; /* keep checking other objects */
 523         }
 524
 525         obj->flags &= ~(REACHABLE | SEEN);
 526         obj->flags |= HAS_OBJ;
 527         if (fsck_obj(obj))
 528                 errors_found |= ERROR_OBJECT;
 529         return 0;
 530 }
 531
 532 static int fsck_cruft(const char *basename, const char *path, void *data)
 533 {
 534         if (!starts_with(basename, "tmp_obj_"))
 535                 fprintf(stderr, "bad sha1 file: %s\n", path);
 536         return 0;
 537 }
 538
 539 static int fsck_subdir(unsigned int nr, const char *path, void *progress)
 540 {
 541         display_progress(progress, nr + 1);
 542         return 0;
 543 }
 544
 545 static void fsck_object_dir(const char *path)
 546 {
 547         struct progress *progress = NULL;
 548
 549         if (verbose)
 550                 fprintf(stderr, "Checking object directory\n");
 551
 552         if (show_progress)
 553                 progress = start_progress(_("Checking object directories"), 256);
 554
 555         for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
 556                                       progress);
 557         display_progress(progress, 256);
 558         stop_progress(&progress);
 559 }
 560
 561 static int fsck_head_link(void)
 562 {
 563         int null_is_error = 0;
 564
 565         if (verbose)
 566                 fprintf(stderr, "Checking HEAD link\n");
 567
 568         head_points_at = resolve_ref_unsafe("HEAD", 0, head_oid.hash, NULL);
 569         if (!head_points_at) {
 570                 errors_found |= ERROR_REFS;
 571                 return error("Invalid HEAD");
 572         }
 573         if (!strcmp(head_points_at, "HEAD"))
 574                 /* detached HEAD */
 575                 null_is_error = 1;
 576         else if (!starts_with(head_points_at, "refs/heads/")) {
 577                 errors_found |= ERROR_REFS;
 578                 return error("HEAD points to something strange (%s)",
 579                              head_points_at);
 580         }
 581         if (is_null_oid(&head_oid)) {
 582                 if (null_is_error) {
 583                         errors_found |= ERROR_REFS;
 584                         return error("HEAD: detached HEAD points at nothing");
 585                 }
 586                 fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
 587                         head_points_at + 11);
 588         }
 589         return 0;
 590 }
 591
 592 static int fsck_cache_tree(struct cache_tree *it)
 593 {
 594         int i;
 595         int err = 0;
 596
 597         if (verbose)
 598                 fprintf(stderr, "Checking cache tree\n");
 599
 600         if (0 <= it->entry_count) {
 601                 struct object *obj = parse_object(&it->oid);
 602                 if (!obj) {
 603                         error("%s: invalid sha1 pointer in cache-tree",
 604                               oid_to_hex(&it->oid));
 605                         errors_found |= ERROR_REFS;
 606                         return 1;
 607                 }
 608                 obj->flags |= USED;
 609                 if (name_objects)
 610                         add_decoration(fsck_walk_options.object_names,
 611                                 obj, xstrdup(":"));
 612                 mark_object_reachable(obj);
 613                 if (obj->type != OBJ_TREE)
 614                         err |= objerror(obj, "non-tree in cache-tree");
 615         }
 616         for (i = 0; i < it->subtree_nr; i++)
 617                 err |= fsck_cache_tree(it->down[i]->cache_tree);
 618         return err;
 619 }
 620
 621 static void mark_object_for_connectivity(const struct object_id *oid)
 622 {
 623         struct object *obj = lookup_unknown_object(oid->hash);
 624         obj->flags |= HAS_OBJ;
 625 }
 626
 627 static int mark_loose_for_connectivity(const struct object_id *oid,
 628                                        const char *path,
 629                                        void *data)
 630 {
 631         mark_object_for_connectivity(oid);
 632         return 0;
 633 }
 634
 635 static int mark_packed_for_connectivity(const struct object_id *oid,
 636                                         struct packed_git *pack,
 637                                         uint32_t pos,
 638                                         void *data)
 639 {
 640         mark_object_for_connectivity(oid);
 641         return 0;
 642 }
 643
 644 static char const * const fsck_usage[] = {
 645         N_("git fsck [<options>] [<object>...]"),
 646         NULL
 647 };
 648
 649 static struct option fsck_opts[] = {
 650         OPT__VERBOSE(&verbose, N_("be verbose")),
 651         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
 652         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
 653         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
 654         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
 655         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
 656         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
 657         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
 658         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
 659         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
 660         OPT_BOOL(0, "lost-found", &write_lost_and_found,
 661                                 N_("write dangling objects in .git/lost-found")),
 662         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 663         OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
 664         OPT_END(),
 665 };
 666
 667 int cmd_fsck(int argc, const char **argv, const char *prefix)
 668 {
 669         int i;
 670         struct alternate_object_database *alt;
 671
 672         errors_found = 0;
 673         check_replace_refs = 0;
 674
 675         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 676
 677         fsck_walk_options.walk = mark_object;
 678         fsck_obj_options.walk = mark_used;
 679         fsck_obj_options.error_func = fsck_error_func;
 680         if (check_strict)
 681                 fsck_obj_options.strict = 1;
 682
 683         if (show_progress == -1)
 684                 show_progress = isatty(2);
 685         if (verbose)
 686                 show_progress = 0;
 687
 688         if (write_lost_and_found) {
 689                 check_full = 1;
 690                 include_reflogs = 0;
 691         }
 692
 693         if (name_objects)
 694                 fsck_walk_options.object_names =
 695                         xcalloc(1, sizeof(struct decoration));
 696
 697         git_config(fsck_config, NULL);
 698
 699         fsck_head_link();
 700         if (connectivity_only) {
 701                 for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
 702                 for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
 703         } else {
 704                 fsck_object_dir(get_object_directory());
 705
 706                 prepare_alt_odb();
 707                 for (alt = alt_odb_list; alt; alt = alt->next)
 708                         fsck_object_dir(alt->path);
 709
 710                 if (check_full) {
 711                         struct packed_git *p;
 712                         uint32_t total = 0, count = 0;
 713                         struct progress *progress = NULL;
 714
 715                         prepare_packed_git();
 716
 717                         if (show_progress) {
 718                                 for (p = packed_git; p; p = p->next) {
 719                                         if (open_pack_index(p))
 720                                                 continue;
 721                                         total += p->num_objects;
 722                                 }
 723
 724                                 progress = start_progress(_("Checking objects"), total);
 725                         }
 726                         for (p = packed_git; p; p = p->next) {
 727                                 /* verify gives error messages itself */
 728                                 if (verify_pack(p, fsck_obj_buffer,
 729                                                 progress, count))
 730                                         errors_found |= ERROR_PACK;
 731                                 count += p->num_objects;
 732                         }
 733                         stop_progress(&progress);
 734                 }
 735         }
 736
 737         for (i = 0; i < argc; i++) {
 738                 const char *arg = argv[i];
 739                 unsigned char sha1[20];
 740                 if (!get_sha1(arg, sha1)) {
 741                         struct object *obj = lookup_object(sha1);
 742
 743                         if (!obj || !(obj->flags & HAS_OBJ)) {
 744                                 error("%s: object missing", sha1_to_hex(sha1));
 745                                 errors_found |= ERROR_OBJECT;
 746                                 continue;
 747                         }
 748
 749                         obj->flags |= USED;
 750                         if (name_objects)
 751                                 add_decoration(fsck_walk_options.object_names,
 752                                         obj, xstrdup(arg));
 753                         mark_object_reachable(obj);
 754                         continue;
 755                 }
 756                 error("invalid parameter: expected sha1, got '%s'", arg);
 757                 errors_found |= ERROR_OBJECT;
 758         }
 759
 760         /*
 761          * If we've not been given any explicit head information, do the
 762          * default ones from .git/refs. We also consider the index file
 763          * in this case (ie this implies --cache).
 764          */
 765         if (!argc) {
 766                 get_default_heads();
 767                 keep_cache_objects = 1;
 768         }
 769
 770         if (keep_cache_objects) {
 771                 verify_index_checksum = 1;
 772                 read_cache();
 773                 for (i = 0; i < active_nr; i++) {
 774                         unsigned int mode;
 775                         struct blob *blob;
 776                         struct object *obj;
 777
 778                         mode = active_cache[i]->ce_mode;
 779                         if (S_ISGITLINK(mode))
 780                                 continue;
 781                         blob = lookup_blob(&active_cache[i]->oid);
 782                         if (!blob)
 783                                 continue;
 784                         obj = &blob->object;
 785                         obj->flags |= USED;
 786                         if (name_objects)
 787                                 add_decoration(fsck_walk_options.object_names,
 788                                         obj,
 789                                         xstrfmt(":%s", active_cache[i]->name));
 790                         mark_object_reachable(obj);
 791                 }
 792                 if (active_cache_tree)
 793                         fsck_cache_tree(active_cache_tree);
 794         }
 795
 796         check_connectivity();
 797         return errors_found;
 798 }