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