builtin/fsck.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "repository.h"
   4 #include "config.h"
   5 #include "commit.h"
   6 #include "tree.h"
   7 #include "blob.h"
   8 #include "tag.h"
   9 #include "refs.h"
  10 #include "pack.h"
  11 #include "cache-tree.h"
  12 #include "tree-walk.h"
  13 #include "fsck.h"
  14 #include "parse-options.h"
  15 #include "dir.h"
  16 #include "progress.h"
  17 #include "streaming.h"
  18 #include "decorate.h"
  19 #include "packfile.h"
  20 #include "object-store.h"
  21
  22 #define REACHABLE 0x0001
  23 #define SEEN      0x0002
  24 #define HAS_OBJ   0x0004
  25 /* This flag is set if something points to this object. */
  26 #define USED      0x0008
  27
  28 static int show_root;
  29 static int show_tags;
  30 static int show_unreachable;
  31 static int include_reflogs = 1;
  32 static int check_full = 1;
  33 static int connectivity_only;
  34 static int check_strict;
  35 static int keep_cache_objects;
  36 static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
  37 static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
  38 static struct object_id head_oid;
  39 static const char *head_points_at;
  40 static int errors_found;
  41 static int write_lost_and_found;
  42 static int verbose;
  43 static int show_progress = -1;
  44 static int show_dangling = 1;
  45 static int name_objects;
  46 #define ERROR_OBJECT 01
  47 #define ERROR_REACHABLE 02
  48 #define ERROR_PACK 04
  49 #define ERROR_REFS 010
  50
  51 static const char *describe_object(struct object *obj)
  52 {
  53         static struct strbuf buf = STRBUF_INIT;
  54         char *name = name_objects ?
  55                 lookup_decoration(fsck_walk_options.object_names, obj) : NULL;
  56
  57         strbuf_reset(&buf);
  58         strbuf_addstr(&buf, oid_to_hex(&obj->oid));
  59         if (name)
  60                 strbuf_addf(&buf, " (%s)", name);
  61
  62         return buf.buf;
  63 }
  64
  65 static const char *printable_type(struct object *obj)
  66 {
  67         const char *ret;
  68
  69         if (obj->type == OBJ_NONE) {
  70                 enum object_type type = sha1_object_info(obj->oid.hash, NULL);
  71                 if (type > 0)
  72                         object_as_type(obj, type, 0);
  73         }
  74
  75         ret = typename(obj->type);
  76         if (!ret)
  77                 ret = "unknown";
  78
  79         return ret;
  80 }
  81
  82 static int fsck_config(const char *var, const char *value, void *cb)
  83 {
  84         if (strcmp(var, "fsck.skiplist") == 0) {
  85                 const char *path;
  86                 struct strbuf sb = STRBUF_INIT;
  87
  88                 if (git_config_pathname(&path, var, value))
  89                         return 1;
  90                 strbuf_addf(&sb, "skiplist=%s", path);
  91                 free((char *)path);
  92                 fsck_set_msg_types(&fsck_obj_options, sb.buf);
  93                 strbuf_release(&sb);
  94                 return 0;
  95         }
  96
  97         if (skip_prefix(var, "fsck.", &var)) {
  98                 fsck_set_msg_type(&fsck_obj_options, var, value);
  99                 return 0;
 100         }
 101
 102         return git_default_config(var, value, cb);
 103 }
 104
 105 static void objreport(struct object *obj, const char *msg_type,
 106                         const char *err)
 107 {
 108         fprintf(stderr, "%s in %s %s: %s\n",
 109                 msg_type, printable_type(obj), describe_object(obj), err);
 110 }
 111
 112 static int objerror(struct object *obj, const char *err)
 113 {
 114         errors_found |= ERROR_OBJECT;
 115         objreport(obj, "error", err);
 116         return -1;
 117 }
 118
 119 static int fsck_error_func(struct fsck_options *o,
 120         struct object *obj, int type, const char *message)
 121 {
 122         objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message);
 123         return (type == FSCK_WARN) ? 0 : 1;
 124 }
 125
 126 static struct object_array pending;
 127
 128 static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
 129 {
 130         struct object *parent = data;
 131
 132         /*
 133          * The only case data is NULL or type is OBJ_ANY is when
 134          * mark_object_reachable() calls us.  All the callers of
 135          * that function has non-NULL obj hence ...
 136          */
 137         if (!obj) {
 138                 /* ... these references to parent->fld are safe here */
 139                 printf("broken link from %7s %s\n",
 140                            printable_type(parent), describe_object(parent));
 141                 printf("broken link from %7s %s\n",
 142                            (type == OBJ_ANY ? "unknown" : typename(type)), "unknown");
 143                 errors_found |= ERROR_REACHABLE;
 144                 return 1;
 145         }
 146
 147         if (type != OBJ_ANY && obj->type != type)
 148                 /* ... and the reference to parent is safe here */
 149                 objerror(parent, "wrong object type in link");
 150
 151         if (obj->flags & REACHABLE)
 152                 return 0;
 153         obj->flags |= REACHABLE;
 154
 155         if (is_promisor_object(&obj->oid))
 156                 /*
 157                  * Further recursion does not need to be performed on this
 158                  * object since it is a promisor object (so it does not need to
 159                  * be added to "pending").
 160                  */
 161                 return 0;
 162
 163         if (!(obj->flags & HAS_OBJ)) {
 164                 if (parent && !has_object_file(&obj->oid)) {
 165                         printf("broken link from %7s %s\n",
 166                                  printable_type(parent), describe_object(parent));
 167                         printf("              to %7s %s\n",
 168                                  printable_type(obj), describe_object(obj));
 169                         errors_found |= ERROR_REACHABLE;
 170                 }
 171                 return 1;
 172         }
 173
 174         add_object_array(obj, NULL, &pending);
 175         return 0;
 176 }
 177
 178 static void mark_object_reachable(struct object *obj)
 179 {
 180         mark_object(obj, OBJ_ANY, NULL, NULL);
 181 }
 182
 183 static int traverse_one_object(struct object *obj)
 184 {
 185         return fsck_walk(obj, obj, &fsck_walk_options);
 186 }
 187
 188 static int traverse_reachable(void)
 189 {
 190         struct progress *progress = NULL;
 191         unsigned int nr = 0;
 192         int result = 0;
 193         if (show_progress)
 194                 progress = start_delayed_progress(_("Checking connectivity"), 0);
 195         while (pending.nr) {
 196                 result |= traverse_one_object(object_array_pop(&pending));
 197                 display_progress(progress, ++nr);
 198         }
 199         stop_progress(&progress);
 200         return !!result;
 201 }
 202
 203 static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
 204 {
 205         if (!obj)
 206                 return 1;
 207         obj->flags |= USED;
 208         return 0;
 209 }
 210
 211 /*
 212  * Check a single reachable object
 213  */
 214 static void check_reachable_object(struct object *obj)
 215 {
 216         /*
 217          * We obviously want the object to be parsed,
 218          * except if it was in a pack-file and we didn't
 219          * do a full fsck
 220          */
 221         if (!(obj->flags & HAS_OBJ)) {
 222                 if (is_promisor_object(&obj->oid))
 223                         return;
 224                 if (has_sha1_pack(obj->oid.hash))
 225                         return; /* it is in pack - forget about it */
 226                 printf("missing %s %s\n", printable_type(obj),
 227                         describe_object(obj));
 228                 errors_found |= ERROR_REACHABLE;
 229                 return;
 230         }
 231 }
 232
 233 /*
 234  * Check a single unreachable object
 235  */
 236 static void check_unreachable_object(struct object *obj)
 237 {
 238         /*
 239          * Missing unreachable object? Ignore it. It's not like
 240          * we miss it (since it can't be reached), nor do we want
 241          * to complain about it being unreachable (since it does
 242          * not exist).
 243          */
 244         if (!(obj->flags & HAS_OBJ))
 245                 return;
 246
 247         /*
 248          * Unreachable object that exists? Show it if asked to,
 249          * since this is something that is prunable.
 250          */
 251         if (show_unreachable) {
 252                 printf("unreachable %s %s\n", printable_type(obj),
 253                         describe_object(obj));
 254                 return;
 255         }
 256
 257         /*
 258          * "!USED" means that nothing at all points to it, including
 259          * other unreachable objects. In other words, it's the "tip"
 260          * of some set of unreachable objects, usually a commit that
 261          * got dropped.
 262          *
 263          * Such starting points are more interesting than some random
 264          * set of unreachable objects, so we show them even if the user
 265          * hasn't asked for _all_ unreachable objects. If you have
 266          * deleted a branch by mistake, this is a prime candidate to
 267          * start looking at, for example.
 268          */
 269         if (!(obj->flags & USED)) {
 270                 if (show_dangling)
 271                         printf("dangling %s %s\n", printable_type(obj),
 272                                describe_object(obj));
 273                 if (write_lost_and_found) {
 274                         char *filename = git_pathdup("lost-found/%s/%s",
 275                                 obj->type == OBJ_COMMIT ? "commit" : "other",
 276                                 describe_object(obj));
 277                         FILE *f;
 278
 279                         if (safe_create_leading_directories_const(filename)) {
 280                                 error("Could not create lost-found");
 281                                 free(filename);
 282                                 return;
 283                         }
 284                         f = xfopen(filename, "w");
 285                         if (obj->type == OBJ_BLOB) {
 286                                 if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
 287                                         die_errno("Could not write '%s'", filename);
 288                         } else
 289                                 fprintf(f, "%s\n", describe_object(obj));
 290                         if (fclose(f))
 291                                 die_errno("Could not finish '%s'",
 292                                           filename);
 293                         free(filename);
 294                 }
 295                 return;
 296         }
 297
 298         /*
 299          * Otherwise? It's there, it's unreachable, and some other unreachable
 300          * object points to it. Ignore it - it's not interesting, and we showed
 301          * all the interesting cases above.
 302          */
 303 }
 304
 305 static void check_object(struct object *obj)
 306 {
 307         if (verbose)
 308                 fprintf(stderr, "Checking %s\n", describe_object(obj));
 309
 310         if (obj->flags & REACHABLE)
 311                 check_reachable_object(obj);
 312         else
 313                 check_unreachable_object(obj);
 314 }
 315
 316 static void check_connectivity(void)
 317 {
 318         int i, max;
 319
 320         /* Traverse the pending reachable objects */
 321         traverse_reachable();
 322
 323         /* Look up all the requirements, warn about missing objects.. */
 324         max = get_max_object_index();
 325         if (verbose)
 326                 fprintf(stderr, "Checking connectivity (%d objects)\n", max);
 327
 328         for (i = 0; i < max; i++) {
 329                 struct object *obj = get_indexed_object(i);
 330
 331                 if (obj)
 332                         check_object(obj);
 333         }
 334 }
 335
 336 static int fsck_obj(struct object *obj)
 337 {
 338         int err;
 339
 340         if (obj->flags & SEEN)
 341                 return 0;
 342         obj->flags |= SEEN;
 343
 344         if (verbose)
 345                 fprintf(stderr, "Checking %s %s\n",
 346                         printable_type(obj), describe_object(obj));
 347
 348         if (fsck_walk(obj, NULL, &fsck_obj_options))
 349                 objerror(obj, "broken links");
 350         err = fsck_object(obj, NULL, 0, &fsck_obj_options);
 351         if (err)
 352                 goto out;
 353
 354         if (obj->type == OBJ_COMMIT) {
 355                 struct commit *commit = (struct commit *) obj;
 356
 357                 if (!commit->parents && show_root)
 358                         printf("root %s\n", describe_object(&commit->object));
 359         }
 360
 361         if (obj->type == OBJ_TAG) {
 362                 struct tag *tag = (struct tag *) obj;
 363
 364                 if (show_tags && tag->tagged) {
 365                         printf("tagged %s %s", printable_type(tag->tagged),
 366                                 describe_object(tag->tagged));
 367                         printf(" (%s) in %s\n", tag->tag,
 368                                 describe_object(&tag->object));
 369                 }
 370         }
 371
 372 out:
 373         if (obj->type == OBJ_TREE)
 374                 free_tree_buffer((struct tree *)obj);
 375         if (obj->type == OBJ_COMMIT)
 376                 free_commit_buffer((struct commit *)obj);
 377         return err;
 378 }
 379
 380 static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
 381                            unsigned long size, void *buffer, int *eaten)
 382 {
 383         /*
 384          * Note, buffer may be NULL if type is OBJ_BLOB. See
 385          * verify_packfile(), data_valid variable for details.
 386          */
 387         struct object *obj;
 388         obj = parse_object_buffer(oid, type, size, buffer, eaten);
 389         if (!obj) {
 390                 errors_found |= ERROR_OBJECT;
 391                 return error("%s: object corrupt or missing", oid_to_hex(oid));
 392         }
 393         obj->flags &= ~(REACHABLE | SEEN);
 394         obj->flags |= HAS_OBJ;
 395         return fsck_obj(obj);
 396 }
 397
 398 static int default_refs;
 399
 400 static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
 401         timestamp_t timestamp)
 402 {
 403         struct object *obj;
 404
 405         if (!is_null_oid(oid)) {
 406                 obj = lookup_object(oid->hash);
 407                 if (obj && (obj->flags & HAS_OBJ)) {
 408                         if (timestamp && name_objects)
 409                                 add_decoration(fsck_walk_options.object_names,
 410                                         obj,
 411                                         xstrfmt("%s@{%"PRItime"}", refname, timestamp));
 412                         obj->flags |= USED;
 413                         mark_object_reachable(obj);
 414                 } else if (!is_promisor_object(oid)) {
 415                         error("%s: invalid reflog entry %s", refname, oid_to_hex(oid));
 416                         errors_found |= ERROR_REACHABLE;
 417                 }
 418         }
 419 }
 420
 421 static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid,
 422                 const char *email, timestamp_t timestamp, int tz,
 423                 const char *message, void *cb_data)
 424 {
 425         const char *refname = cb_data;
 426
 427         if (verbose)
 428                 fprintf(stderr, "Checking reflog %s->%s\n",
 429                         oid_to_hex(ooid), oid_to_hex(noid));
 430
 431         fsck_handle_reflog_oid(refname, ooid, 0);
 432         fsck_handle_reflog_oid(refname, noid, timestamp);
 433         return 0;
 434 }
 435
 436 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
 437                               int flag, void *cb_data)
 438 {
 439         for_each_reflog_ent(logname, fsck_handle_reflog_ent, (void *)logname);
 440         return 0;
 441 }
 442
 443 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 444                            int flag, void *cb_data)
 445 {
 446         struct object *obj;
 447
 448         obj = parse_object(oid);
 449         if (!obj) {
 450                 if (is_promisor_object(oid)) {
 451                         /*
 452                          * Increment default_refs anyway, because this is a
 453                          * valid ref.
 454                          */
 455                          default_refs++;
 456                          return 0;
 457                 }
 458                 error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
 459                 errors_found |= ERROR_REACHABLE;
 460                 /* We'll continue with the rest despite the error.. */
 461                 return 0;
 462         }
 463         if (obj->type != OBJ_COMMIT && is_branch(refname)) {
 464                 error("%s: not a commit", refname);
 465                 errors_found |= ERROR_REFS;
 466         }
 467         default_refs++;
 468         obj->flags |= USED;
 469         if (name_objects)
 470                 add_decoration(fsck_walk_options.object_names,
 471                         obj, xstrdup(refname));
 472         mark_object_reachable(obj);
 473
 474         return 0;
 475 }
 476
 477 static void get_default_heads(void)
 478 {
 479         if (head_points_at && !is_null_oid(&head_oid))
 480                 fsck_handle_ref("HEAD", &head_oid, 0, NULL);
 481         for_each_rawref(fsck_handle_ref, NULL);
 482         if (include_reflogs)
 483                 for_each_reflog(fsck_handle_reflog, NULL);
 484
 485         /*
 486          * Not having any default heads isn't really fatal, but
 487          * it does mean that "--unreachable" no longer makes any
 488          * sense (since in this case everything will obviously
 489          * be unreachable by definition.
 490          *
 491          * Showing dangling objects is valid, though (as those
 492          * dangling objects are likely lost heads).
 493          *
 494          * So we just print a warning about it, and clear the
 495          * "show_unreachable" flag.
 496          */
 497         if (!default_refs) {
 498                 fprintf(stderr, "notice: No default references\n");
 499                 show_unreachable = 0;
 500         }
 501 }
 502
 503 static struct object *parse_loose_object(const struct object_id *oid,
 504                                          const char *path)
 505 {
 506         struct object *obj;
 507         void *contents;
 508         enum object_type type;
 509         unsigned long size;
 510         int eaten;
 511
 512         if (read_loose_object(path, oid->hash, &type, &size, &contents) < 0)
 513                 return NULL;
 514
 515         if (!contents && type != OBJ_BLOB)
 516                 die("BUG: read_loose_object streamed a non-blob");
 517
 518         obj = parse_object_buffer(oid, type, size, contents, &eaten);
 519
 520         if (!eaten)
 521                 free(contents);
 522         return obj;
 523 }
 524
 525 static int fsck_loose(const struct object_id *oid, const char *path, void *data)
 526 {
 527         struct object *obj = parse_loose_object(oid, path);
 528
 529         if (!obj) {
 530                 errors_found |= ERROR_OBJECT;
 531                 error("%s: object corrupt or missing: %s",
 532                       oid_to_hex(oid), path);
 533                 return 0; /* keep checking other objects */
 534         }
 535
 536         obj->flags &= ~(REACHABLE | SEEN);
 537         obj->flags |= HAS_OBJ;
 538         if (fsck_obj(obj))
 539                 errors_found |= ERROR_OBJECT;
 540         return 0;
 541 }
 542
 543 static int fsck_cruft(const char *basename, const char *path, void *data)
 544 {
 545         if (!starts_with(basename, "tmp_obj_"))
 546                 fprintf(stderr, "bad sha1 file: %s\n", path);
 547         return 0;
 548 }
 549
 550 static int fsck_subdir(unsigned int nr, const char *path, void *progress)
 551 {
 552         display_progress(progress, nr + 1);
 553         return 0;
 554 }
 555
 556 static void fsck_object_dir(const char *path)
 557 {
 558         struct progress *progress = NULL;
 559
 560         if (verbose)
 561                 fprintf(stderr, "Checking object directory\n");
 562
 563         if (show_progress)
 564                 progress = start_progress(_("Checking object directories"), 256);
 565
 566         for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
 567                                       progress);
 568         display_progress(progress, 256);
 569         stop_progress(&progress);
 570 }
 571
 572 static int fsck_head_link(void)
 573 {
 574         int null_is_error = 0;
 575
 576         if (verbose)
 577                 fprintf(stderr, "Checking HEAD link\n");
 578
 579         head_points_at = resolve_ref_unsafe("HEAD", 0, &head_oid, NULL);
 580         if (!head_points_at) {
 581                 errors_found |= ERROR_REFS;
 582                 return error("Invalid HEAD");
 583         }
 584         if (!strcmp(head_points_at, "HEAD"))
 585                 /* detached HEAD */
 586                 null_is_error = 1;
 587         else if (!starts_with(head_points_at, "refs/heads/")) {
 588                 errors_found |= ERROR_REFS;
 589                 return error("HEAD points to something strange (%s)",
 590                              head_points_at);
 591         }
 592         if (is_null_oid(&head_oid)) {
 593                 if (null_is_error) {
 594                         errors_found |= ERROR_REFS;
 595                         return error("HEAD: detached HEAD points at nothing");
 596                 }
 597                 fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
 598                         head_points_at + 11);
 599         }
 600         return 0;
 601 }
 602
 603 static int fsck_cache_tree(struct cache_tree *it)
 604 {
 605         int i;
 606         int err = 0;
 607
 608         if (verbose)
 609                 fprintf(stderr, "Checking cache tree\n");
 610
 611         if (0 <= it->entry_count) {
 612                 struct object *obj = parse_object(&it->oid);
 613                 if (!obj) {
 614                         error("%s: invalid sha1 pointer in cache-tree",
 615                               oid_to_hex(&it->oid));
 616                         errors_found |= ERROR_REFS;
 617                         return 1;
 618                 }
 619                 obj->flags |= USED;
 620                 if (name_objects)
 621                         add_decoration(fsck_walk_options.object_names,
 622                                 obj, xstrdup(":"));
 623                 mark_object_reachable(obj);
 624                 if (obj->type != OBJ_TREE)
 625                         err |= objerror(obj, "non-tree in cache-tree");
 626         }
 627         for (i = 0; i < it->subtree_nr; i++)
 628                 err |= fsck_cache_tree(it->down[i]->cache_tree);
 629         return err;
 630 }
 631
 632 static void mark_object_for_connectivity(const struct object_id *oid)
 633 {
 634         struct object *obj = lookup_unknown_object(oid->hash);
 635         obj->flags |= HAS_OBJ;
 636 }
 637
 638 static int mark_loose_for_connectivity(const struct object_id *oid,
 639                                        const char *path,
 640                                        void *data)
 641 {
 642         mark_object_for_connectivity(oid);
 643         return 0;
 644 }
 645
 646 static int mark_packed_for_connectivity(const struct object_id *oid,
 647                                         struct packed_git *pack,
 648                                         uint32_t pos,
 649                                         void *data)
 650 {
 651         mark_object_for_connectivity(oid);
 652         return 0;
 653 }
 654
 655 static char const * const fsck_usage[] = {
 656         N_("git fsck [<options>] [<object>...]"),
 657         NULL
 658 };
 659
 660 static struct option fsck_opts[] = {
 661         OPT__VERBOSE(&verbose, N_("be verbose")),
 662         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
 663         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
 664         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
 665         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
 666         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
 667         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
 668         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
 669         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
 670         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
 671         OPT_BOOL(0, "lost-found", &write_lost_and_found,
 672                                 N_("write dangling objects in .git/lost-found")),
 673         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 674         OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
 675         OPT_END(),
 676 };
 677
 678 int cmd_fsck(int argc, const char **argv, const char *prefix)
 679 {
 680         int i;
 681         struct alternate_object_database *alt;
 682
 683         /* fsck knows how to handle missing promisor objects */
 684         fetch_if_missing = 0;
 685
 686         errors_found = 0;
 687         check_replace_refs = 0;
 688
 689         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 690
 691         fsck_walk_options.walk = mark_object;
 692         fsck_obj_options.walk = mark_used;
 693         fsck_obj_options.error_func = fsck_error_func;
 694         if (check_strict)
 695                 fsck_obj_options.strict = 1;
 696
 697         if (show_progress == -1)
 698                 show_progress = isatty(2);
 699         if (verbose)
 700                 show_progress = 0;
 701
 702         if (write_lost_and_found) {
 703                 check_full = 1;
 704                 include_reflogs = 0;
 705         }
 706
 707         if (name_objects)
 708                 fsck_walk_options.object_names =
 709                         xcalloc(1, sizeof(struct decoration));
 710
 711         git_config(fsck_config, NULL);
 712
 713         fsck_head_link();
 714         if (connectivity_only) {
 715                 for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
 716                 for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
 717         } else {
 718                 struct alternate_object_database *alt_odb_list;
 719
 720                 fsck_object_dir(get_object_directory());
 721
 722                 prepare_alt_odb(the_repository);
 723                 alt_odb_list = the_repository->objects->alt_odb_list;
 724                 for (alt = alt_odb_list; alt; alt = alt->next)
 725                         fsck_object_dir(alt->path);
 726
 727                 if (check_full) {
 728                         struct packed_git *p;
 729                         uint32_t total = 0, count = 0;
 730                         struct progress *progress = NULL;
 731
 732                         prepare_packed_git();
 733
 734                         if (show_progress) {
 735                                 for (p = get_packed_git(the_repository); p;
 736                                      p = p->next) {
 737                                         if (open_pack_index(p))
 738                                                 continue;
 739                                         total += p->num_objects;
 740                                 }
 741
 742                                 progress = start_progress(_("Checking objects"), total);
 743                         }
 744                         for (p = get_packed_git(the_repository); p;
 745                              p = p->next) {
 746                                 /* verify gives error messages itself */
 747                                 if (verify_pack(p, fsck_obj_buffer,
 748                                                 progress, count))
 749                                         errors_found |= ERROR_PACK;
 750                                 count += p->num_objects;
 751                         }
 752                         stop_progress(&progress);
 753                 }
 754         }
 755
 756         for (i = 0; i < argc; i++) {
 757                 const char *arg = argv[i];
 758                 struct object_id oid;
 759                 if (!get_oid(arg, &oid)) {
 760                         struct object *obj = lookup_object(oid.hash);
 761
 762                         if (!obj || !(obj->flags & HAS_OBJ)) {
 763                                 if (is_promisor_object(&oid))
 764                                         continue;
 765                                 error("%s: object missing", oid_to_hex(&oid));
 766                                 errors_found |= ERROR_OBJECT;
 767                                 continue;
 768                         }
 769
 770                         obj->flags |= USED;
 771                         if (name_objects)
 772                                 add_decoration(fsck_walk_options.object_names,
 773                                         obj, xstrdup(arg));
 774                         mark_object_reachable(obj);
 775                         continue;
 776                 }
 777                 error("invalid parameter: expected sha1, got '%s'", arg);
 778                 errors_found |= ERROR_OBJECT;
 779         }
 780
 781         /*
 782          * If we've not been given any explicit head information, do the
 783          * default ones from .git/refs. We also consider the index file
 784          * in this case (ie this implies --cache).
 785          */
 786         if (!argc) {
 787                 get_default_heads();
 788                 keep_cache_objects = 1;
 789         }
 790
 791         if (keep_cache_objects) {
 792                 verify_index_checksum = 1;
 793                 verify_ce_order = 1;
 794                 read_cache();
 795                 for (i = 0; i < active_nr; i++) {
 796                         unsigned int mode;
 797                         struct blob *blob;
 798                         struct object *obj;
 799
 800                         mode = active_cache[i]->ce_mode;
 801                         if (S_ISGITLINK(mode))
 802                                 continue;
 803                         blob = lookup_blob(&active_cache[i]->oid);
 804                         if (!blob)
 805                                 continue;
 806                         obj = &blob->object;
 807                         obj->flags |= USED;
 808                         if (name_objects)
 809                                 add_decoration(fsck_walk_options.object_names,
 810                                         obj,
 811                                         xstrfmt(":%s", active_cache[i]->name));
 812                         mark_object_reachable(obj);
 813                 }
 814                 if (active_cache_tree)
 815                         fsck_cache_tree(active_cache_tree);
 816         }
 817
 818         check_connectivity();
 819         return errors_found;
 820 }