git.oblomov.eu Git - git/blob - 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 #include "run-command.h"
  22
  23 #define REACHABLE 0x0001
  24 #define SEEN      0x0002
  25 #define HAS_OBJ   0x0004
  26 /* This flag is set if something points to this object. */
  27 #define USED      0x0008
  28
  29 static int show_root;
  30 static int show_tags;
  31 static int show_unreachable;
  32 static int include_reflogs = 1;
  33 static int check_full = 1;
  34 static int connectivity_only;
  35 static int check_strict;
  36 static int keep_cache_objects;
  37 static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
  38 static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
  39 static struct object_id head_oid;
  40 static const char *head_points_at;
  41 static int errors_found;
  42 static int write_lost_and_found;
  43 static int verbose;
  44 static int show_progress = -1;
  45 static int show_dangling = 1;
  46 static int name_objects;
  47 #define ERROR_OBJECT 01
  48 #define ERROR_REACHABLE 02
  49 #define ERROR_PACK 04
  50 #define ERROR_REFS 010
  51 #define ERROR_COMMIT_GRAPH 020
  52
  53 static const char *describe_object(struct object *obj)
  54 {
  55         static struct strbuf buf = STRBUF_INIT;
  56         char *name = name_objects ?
  57                 lookup_decoration(fsck_walk_options.object_names, obj) : NULL;
  58
  59         strbuf_reset(&buf);
  60         strbuf_addstr(&buf, oid_to_hex(&obj->oid));
  61         if (name)
  62                 strbuf_addf(&buf, " (%s)", name);
  63
  64         return buf.buf;
  65 }
  66
  67 static const char *printable_type(struct object *obj)
  68 {
  69         const char *ret;
  70
  71         if (obj->type == OBJ_NONE) {
  72                 enum object_type type = oid_object_info(the_repository,
  73                                                         &obj->oid, NULL);
  74                 if (type > 0)
  75                         object_as_type(the_repository, obj, type, 0);
  76         }
  77
  78         ret = type_name(obj->type);
  79         if (!ret)
  80                 ret = "unknown";
  81
  82         return ret;
  83 }
  84
  85 static int fsck_config(const char *var, const char *value, void *cb)
  86 {
  87         if (strcmp(var, "fsck.skiplist") == 0) {
  88                 const char *path;
  89                 struct strbuf sb = STRBUF_INIT;
  90
  91                 if (git_config_pathname(&path, var, value))
  92                         return 1;
  93                 strbuf_addf(&sb, "skiplist=%s", path);
  94                 free((char *)path);
  95                 fsck_set_msg_types(&fsck_obj_options, sb.buf);
  96                 strbuf_release(&sb);
  97                 return 0;
  98         }
  99
 100         if (skip_prefix(var, "fsck.", &var)) {
 101                 fsck_set_msg_type(&fsck_obj_options, var, value);
 102                 return 0;
 103         }
 104
 105         return git_default_config(var, value, cb);
 106 }
 107
 108 static void objreport(struct object *obj, const char *msg_type,
 109                         const char *err)
 110 {
 111         fprintf(stderr, "%s in %s %s: %s\n",
 112                 msg_type, printable_type(obj), describe_object(obj), err);
 113 }
 114
 115 static int objerror(struct object *obj, const char *err)
 116 {
 117         errors_found |= ERROR_OBJECT;
 118         objreport(obj, "error", err);
 119         return -1;
 120 }
 121
 122 static int fsck_error_func(struct fsck_options *o,
 123         struct object *obj, int type, const char *message)
 124 {
 125         objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message);
 126         return (type == FSCK_WARN) ? 0 : 1;
 127 }
 128
 129 static struct object_array pending;
 130
 131 static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
 132 {
 133         struct object *parent = data;
 134
 135         /*
 136          * The only case data is NULL or type is OBJ_ANY is when
 137          * mark_object_reachable() calls us.  All the callers of
 138          * that function has non-NULL obj hence ...
 139          */
 140         if (!obj) {
 141                 /* ... these references to parent->fld are safe here */
 142                 printf("broken link from %7s %s\n",
 143                            printable_type(parent), describe_object(parent));
 144                 printf("broken link from %7s %s\n",
 145                            (type == OBJ_ANY ? "unknown" : type_name(type)), "unknown");
 146                 errors_found |= ERROR_REACHABLE;
 147                 return 1;
 148         }
 149
 150         if (type != OBJ_ANY && obj->type != type)
 151                 /* ... and the reference to parent is safe here */
 152                 objerror(parent, "wrong object type in link");
 153
 154         if (obj->flags & REACHABLE)
 155                 return 0;
 156         obj->flags |= REACHABLE;
 157
 158         if (is_promisor_object(&obj->oid))
 159                 /*
 160                  * Further recursion does not need to be performed on this
 161                  * object since it is a promisor object (so it does not need to
 162                  * be added to "pending").
 163                  */
 164                 return 0;
 165
 166         if (!(obj->flags & HAS_OBJ)) {
 167                 if (parent && !has_object_file(&obj->oid)) {
 168                         printf("broken link from %7s %s\n",
 169                                  printable_type(parent), describe_object(parent));
 170                         printf("              to %7s %s\n",
 171                                  printable_type(obj), describe_object(obj));
 172                         errors_found |= ERROR_REACHABLE;
 173                 }
 174                 return 1;
 175         }
 176
 177         add_object_array(obj, NULL, &pending);
 178         return 0;
 179 }
 180
 181 static void mark_object_reachable(struct object *obj)
 182 {
 183         mark_object(obj, OBJ_ANY, NULL, NULL);
 184 }
 185
 186 static int traverse_one_object(struct object *obj)
 187 {
 188         int result = fsck_walk(obj, obj, &fsck_walk_options);
 189
 190         if (obj->type == OBJ_TREE) {
 191                 struct tree *tree = (struct tree *)obj;
 192                 free_tree_buffer(tree);
 193         }
 194         return result;
 195 }
 196
 197 static int traverse_reachable(void)
 198 {
 199         struct progress *progress = NULL;
 200         unsigned int nr = 0;
 201         int result = 0;
 202         if (show_progress)
 203                 progress = start_delayed_progress(_("Checking connectivity"), 0);
 204         while (pending.nr) {
 205                 result |= traverse_one_object(object_array_pop(&pending));
 206                 display_progress(progress, ++nr);
 207         }
 208         stop_progress(&progress);
 209         return !!result;
 210 }
 211
 212 static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
 213 {
 214         if (!obj)
 215                 return 1;
 216         obj->flags |= USED;
 217         return 0;
 218 }
 219
 220 /*
 221  * Check a single reachable object
 222  */
 223 static void check_reachable_object(struct object *obj)
 224 {
 225         /*
 226          * We obviously want the object to be parsed,
 227          * except if it was in a pack-file and we didn't
 228          * do a full fsck
 229          */
 230         if (!(obj->flags & HAS_OBJ)) {
 231                 if (is_promisor_object(&obj->oid))
 232                         return;
 233                 if (has_object_pack(&obj->oid))
 234                         return; /* it is in pack - forget about it */
 235                 printf("missing %s %s\n", printable_type(obj),
 236                         describe_object(obj));
 237                 errors_found |= ERROR_REACHABLE;
 238                 return;
 239         }
 240 }
 241
 242 /*
 243  * Check a single unreachable object
 244  */
 245 static void check_unreachable_object(struct object *obj)
 246 {
 247         /*
 248          * Missing unreachable object? Ignore it. It's not like
 249          * we miss it (since it can't be reached), nor do we want
 250          * to complain about it being unreachable (since it does
 251          * not exist).
 252          */
 253         if (!(obj->flags & HAS_OBJ))
 254                 return;
 255
 256         /*
 257          * Unreachable object that exists? Show it if asked to,
 258          * since this is something that is prunable.
 259          */
 260         if (show_unreachable) {
 261                 printf("unreachable %s %s\n", printable_type(obj),
 262                         describe_object(obj));
 263                 return;
 264         }
 265
 266         /*
 267          * "!USED" means that nothing at all points to it, including
 268          * other unreachable objects. In other words, it's the "tip"
 269          * of some set of unreachable objects, usually a commit that
 270          * got dropped.
 271          *
 272          * Such starting points are more interesting than some random
 273          * set of unreachable objects, so we show them even if the user
 274          * hasn't asked for _all_ unreachable objects. If you have
 275          * deleted a branch by mistake, this is a prime candidate to
 276          * start looking at, for example.
 277          */
 278         if (!(obj->flags & USED)) {
 279                 if (show_dangling)
 280                         printf("dangling %s %s\n", printable_type(obj),
 281                                describe_object(obj));
 282                 if (write_lost_and_found) {
 283                         char *filename = git_pathdup("lost-found/%s/%s",
 284                                 obj->type == OBJ_COMMIT ? "commit" : "other",
 285                                 describe_object(obj));
 286                         FILE *f;
 287
 288                         if (safe_create_leading_directories_const(filename)) {
 289                                 error("Could not create lost-found");
 290                                 free(filename);
 291                                 return;
 292                         }
 293                         f = xfopen(filename, "w");
 294                         if (obj->type == OBJ_BLOB) {
 295                                 if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
 296                                         die_errno("Could not write '%s'", filename);
 297                         } else
 298                                 fprintf(f, "%s\n", describe_object(obj));
 299                         if (fclose(f))
 300                                 die_errno("Could not finish '%s'",
 301                                           filename);
 302                         free(filename);
 303                 }
 304                 return;
 305         }
 306
 307         /*
 308          * Otherwise? It's there, it's unreachable, and some other unreachable
 309          * object points to it. Ignore it - it's not interesting, and we showed
 310          * all the interesting cases above.
 311          */
 312 }
 313
 314 static void check_object(struct object *obj)
 315 {
 316         if (verbose)
 317                 fprintf(stderr, "Checking %s\n", describe_object(obj));
 318
 319         if (obj->flags & REACHABLE)
 320                 check_reachable_object(obj);
 321         else
 322                 check_unreachable_object(obj);
 323 }
 324
 325 static void check_connectivity(void)
 326 {
 327         int i, max;
 328
 329         /* Traverse the pending reachable objects */
 330         traverse_reachable();
 331
 332         /* Look up all the requirements, warn about missing objects.. */
 333         max = get_max_object_index();
 334         if (verbose)
 335                 fprintf(stderr, "Checking connectivity (%d objects)\n", max);
 336
 337         for (i = 0; i < max; i++) {
 338                 struct object *obj = get_indexed_object(i);
 339
 340                 if (obj)
 341                         check_object(obj);
 342         }
 343 }
 344
 345 static int fsck_obj(struct object *obj, void *buffer, unsigned long size)
 346 {
 347         int err;
 348
 349         if (obj->flags & SEEN)
 350                 return 0;
 351         obj->flags |= SEEN;
 352
 353         if (verbose)
 354                 fprintf(stderr, "Checking %s %s\n",
 355                         printable_type(obj), describe_object(obj));
 356
 357         if (fsck_walk(obj, NULL, &fsck_obj_options))
 358                 objerror(obj, "broken links");
 359         err = fsck_object(obj, buffer, size, &fsck_obj_options);
 360         if (err)
 361                 goto out;
 362
 363         if (obj->type == OBJ_COMMIT) {
 364                 struct commit *commit = (struct commit *) obj;
 365
 366                 if (!commit->parents && show_root)
 367                         printf("root %s\n", describe_object(&commit->object));
 368         }
 369
 370         if (obj->type == OBJ_TAG) {
 371                 struct tag *tag = (struct tag *) obj;
 372
 373                 if (show_tags && tag->tagged) {
 374                         printf("tagged %s %s", printable_type(tag->tagged),
 375                                 describe_object(tag->tagged));
 376                         printf(" (%s) in %s\n", tag->tag,
 377                                 describe_object(&tag->object));
 378                 }
 379         }
 380
 381 out:
 382         if (obj->type == OBJ_TREE)
 383                 free_tree_buffer((struct tree *)obj);
 384         if (obj->type == OBJ_COMMIT)
 385                 free_commit_buffer((struct commit *)obj);
 386         return err;
 387 }
 388
 389 static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
 390                            unsigned long size, void *buffer, int *eaten)
 391 {
 392         /*
 393          * Note, buffer may be NULL if type is OBJ_BLOB. See
 394          * verify_packfile(), data_valid variable for details.
 395          */
 396         struct object *obj;
 397         obj = parse_object_buffer(the_repository, oid, type, size, buffer,
 398                                   eaten);
 399         if (!obj) {
 400                 errors_found |= ERROR_OBJECT;
 401                 return error("%s: object corrupt or missing", oid_to_hex(oid));
 402         }
 403         obj->flags &= ~(REACHABLE | SEEN);
 404         obj->flags |= HAS_OBJ;
 405         return fsck_obj(obj, buffer, size);
 406 }
 407
 408 static int default_refs;
 409
 410 static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
 411         timestamp_t timestamp)
 412 {
 413         struct object *obj;
 414
 415         if (!is_null_oid(oid)) {
 416                 obj = lookup_object(the_repository, oid->hash);
 417                 if (obj && (obj->flags & HAS_OBJ)) {
 418                         if (timestamp && name_objects)
 419                                 add_decoration(fsck_walk_options.object_names,
 420                                         obj,
 421                                         xstrfmt("%s@{%"PRItime"}", refname, timestamp));
 422                         obj->flags |= USED;
 423                         mark_object_reachable(obj);
 424                 } else if (!is_promisor_object(oid)) {
 425                         error("%s: invalid reflog entry %s", refname, oid_to_hex(oid));
 426                         errors_found |= ERROR_REACHABLE;
 427                 }
 428         }
 429 }
 430
 431 static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid,
 432                 const char *email, timestamp_t timestamp, int tz,
 433                 const char *message, void *cb_data)
 434 {
 435         const char *refname = cb_data;
 436
 437         if (verbose)
 438                 fprintf(stderr, "Checking reflog %s->%s\n",
 439                         oid_to_hex(ooid), oid_to_hex(noid));
 440
 441         fsck_handle_reflog_oid(refname, ooid, 0);
 442         fsck_handle_reflog_oid(refname, noid, timestamp);
 443         return 0;
 444 }
 445
 446 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
 447                               int flag, void *cb_data)
 448 {
 449         for_each_reflog_ent(logname, fsck_handle_reflog_ent, (void *)logname);
 450         return 0;
 451 }
 452
 453 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 454                            int flag, void *cb_data)
 455 {
 456         struct object *obj;
 457
 458         obj = parse_object(the_repository, oid);
 459         if (!obj) {
 460                 if (is_promisor_object(oid)) {
 461                         /*
 462                          * Increment default_refs anyway, because this is a
 463                          * valid ref.
 464                          */
 465                          default_refs++;
 466                          return 0;
 467                 }
 468                 error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
 469                 errors_found |= ERROR_REACHABLE;
 470                 /* We'll continue with the rest despite the error.. */
 471                 return 0;
 472         }
 473         if (obj->type != OBJ_COMMIT && is_branch(refname)) {
 474                 error("%s: not a commit", refname);
 475                 errors_found |= ERROR_REFS;
 476         }
 477         default_refs++;
 478         obj->flags |= USED;
 479         if (name_objects)
 480                 add_decoration(fsck_walk_options.object_names,
 481                         obj, xstrdup(refname));
 482         mark_object_reachable(obj);
 483
 484         return 0;
 485 }
 486
 487 static void get_default_heads(void)
 488 {
 489         if (head_points_at && !is_null_oid(&head_oid))
 490                 fsck_handle_ref("HEAD", &head_oid, 0, NULL);
 491         for_each_rawref(fsck_handle_ref, NULL);
 492         if (include_reflogs)
 493                 for_each_reflog(fsck_handle_reflog, NULL);
 494
 495         /*
 496          * Not having any default heads isn't really fatal, but
 497          * it does mean that "--unreachable" no longer makes any
 498          * sense (since in this case everything will obviously
 499          * be unreachable by definition.
 500          *
 501          * Showing dangling objects is valid, though (as those
 502          * dangling objects are likely lost heads).
 503          *
 504          * So we just print a warning about it, and clear the
 505          * "show_unreachable" flag.
 506          */
 507         if (!default_refs) {
 508                 fprintf(stderr, "notice: No default references\n");
 509                 show_unreachable = 0;
 510         }
 511 }
 512
 513 static int fsck_loose(const struct object_id *oid, const char *path, void *data)
 514 {
 515         struct object *obj;
 516         enum object_type type;
 517         unsigned long size;
 518         void *contents;
 519         int eaten;
 520
 521         if (read_loose_object(path, oid, &type, &size, &contents) < 0) {
 522                 errors_found |= ERROR_OBJECT;
 523                 error("%s: object corrupt or missing: %s",
 524                       oid_to_hex(oid), path);
 525                 return 0; /* keep checking other objects */
 526         }
 527
 528         if (!contents && type != OBJ_BLOB)
 529                 BUG("read_loose_object streamed a non-blob");
 530
 531         obj = parse_object_buffer(the_repository, oid, type, size,
 532                                   contents, &eaten);
 533
 534         if (!obj) {
 535                 errors_found |= ERROR_OBJECT;
 536                 error("%s: object could not be parsed: %s",
 537                       oid_to_hex(oid), path);
 538                 if (!eaten)
 539                         free(contents);
 540                 return 0; /* keep checking other objects */
 541         }
 542
 543         obj->flags &= ~(REACHABLE | SEEN);
 544         obj->flags |= HAS_OBJ;
 545         if (fsck_obj(obj, contents, size))
 546                 errors_found |= ERROR_OBJECT;
 547
 548         if (!eaten)
 549                 free(contents);
 550         return 0; /* keep checking other objects, even if we saw an error */
 551 }
 552
 553 static int fsck_cruft(const char *basename, const char *path, void *data)
 554 {
 555         if (!starts_with(basename, "tmp_obj_"))
 556                 fprintf(stderr, "bad sha1 file: %s\n", path);
 557         return 0;
 558 }
 559
 560 static int fsck_subdir(unsigned int nr, const char *path, void *progress)
 561 {
 562         display_progress(progress, nr + 1);
 563         return 0;
 564 }
 565
 566 static void fsck_object_dir(const char *path)
 567 {
 568         struct progress *progress = NULL;
 569
 570         if (verbose)
 571                 fprintf(stderr, "Checking object directory\n");
 572
 573         if (show_progress)
 574                 progress = start_progress(_("Checking object directories"), 256);
 575
 576         for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
 577                                       progress);
 578         display_progress(progress, 256);
 579         stop_progress(&progress);
 580 }
 581
 582 static int fsck_head_link(void)
 583 {
 584         int null_is_error = 0;
 585
 586         if (verbose)
 587                 fprintf(stderr, "Checking HEAD link\n");
 588
 589         head_points_at = resolve_ref_unsafe("HEAD", 0, &head_oid, NULL);
 590         if (!head_points_at) {
 591                 errors_found |= ERROR_REFS;
 592                 return error("Invalid HEAD");
 593         }
 594         if (!strcmp(head_points_at, "HEAD"))
 595                 /* detached HEAD */
 596                 null_is_error = 1;
 597         else if (!starts_with(head_points_at, "refs/heads/")) {
 598                 errors_found |= ERROR_REFS;
 599                 return error("HEAD points to something strange (%s)",
 600                              head_points_at);
 601         }
 602         if (is_null_oid(&head_oid)) {
 603                 if (null_is_error) {
 604                         errors_found |= ERROR_REFS;
 605                         return error("HEAD: detached HEAD points at nothing");
 606                 }
 607                 fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
 608                         head_points_at + 11);
 609         }
 610         return 0;
 611 }
 612
 613 static int fsck_cache_tree(struct cache_tree *it)
 614 {
 615         int i;
 616         int err = 0;
 617
 618         if (verbose)
 619                 fprintf(stderr, "Checking cache tree\n");
 620
 621         if (0 <= it->entry_count) {
 622                 struct object *obj = parse_object(the_repository, &it->oid);
 623                 if (!obj) {
 624                         error("%s: invalid sha1 pointer in cache-tree",
 625                               oid_to_hex(&it->oid));
 626                         errors_found |= ERROR_REFS;
 627                         return 1;
 628                 }
 629                 obj->flags |= USED;
 630                 if (name_objects)
 631                         add_decoration(fsck_walk_options.object_names,
 632                                 obj, xstrdup(":"));
 633                 mark_object_reachable(obj);
 634                 if (obj->type != OBJ_TREE)
 635                         err |= objerror(obj, "non-tree in cache-tree");
 636         }
 637         for (i = 0; i < it->subtree_nr; i++)
 638                 err |= fsck_cache_tree(it->down[i]->cache_tree);
 639         return err;
 640 }
 641
 642 static void mark_object_for_connectivity(const struct object_id *oid)
 643 {
 644         struct object *obj = lookup_unknown_object(oid->hash);
 645         obj->flags |= HAS_OBJ;
 646 }
 647
 648 static int mark_loose_for_connectivity(const struct object_id *oid,
 649                                        const char *path,
 650                                        void *data)
 651 {
 652         mark_object_for_connectivity(oid);
 653         return 0;
 654 }
 655
 656 static int mark_packed_for_connectivity(const struct object_id *oid,
 657                                         struct packed_git *pack,
 658                                         uint32_t pos,
 659                                         void *data)
 660 {
 661         mark_object_for_connectivity(oid);
 662         return 0;
 663 }
 664
 665 static char const * const fsck_usage[] = {
 666         N_("git fsck [<options>] [<object>...]"),
 667         NULL
 668 };
 669
 670 static struct option fsck_opts[] = {
 671         OPT__VERBOSE(&verbose, N_("be verbose")),
 672         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
 673         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
 674         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
 675         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
 676         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
 677         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
 678         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
 679         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
 680         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
 681         OPT_BOOL(0, "lost-found", &write_lost_and_found,
 682                                 N_("write dangling objects in .git/lost-found")),
 683         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 684         OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
 685         OPT_END(),
 686 };
 687
 688 int cmd_fsck(int argc, const char **argv, const char *prefix)
 689 {
 690         int i;
 691         struct alternate_object_database *alt;
 692
 693         /* fsck knows how to handle missing promisor objects */
 694         fetch_if_missing = 0;
 695
 696         errors_found = 0;
 697         read_replace_refs = 0;
 698
 699         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 700
 701         fsck_walk_options.walk = mark_object;
 702         fsck_obj_options.walk = mark_used;
 703         fsck_obj_options.error_func = fsck_error_func;
 704         if (check_strict)
 705                 fsck_obj_options.strict = 1;
 706
 707         if (show_progress == -1)
 708                 show_progress = isatty(2);
 709         if (verbose)
 710                 show_progress = 0;
 711
 712         if (write_lost_and_found) {
 713                 check_full = 1;
 714                 include_reflogs = 0;
 715         }
 716
 717         if (name_objects)
 718                 fsck_walk_options.object_names =
 719                         xcalloc(1, sizeof(struct decoration));
 720
 721         git_config(fsck_config, NULL);
 722
 723         fsck_head_link();
 724         if (connectivity_only) {
 725                 for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
 726                 for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
 727         } else {
 728                 struct alternate_object_database *alt_odb_list;
 729
 730                 fsck_object_dir(get_object_directory());
 731
 732                 prepare_alt_odb(the_repository);
 733                 alt_odb_list = the_repository->objects->alt_odb_list;
 734                 for (alt = alt_odb_list; alt; alt = alt->next)
 735                         fsck_object_dir(alt->path);
 736
 737                 if (check_full) {
 738                         struct packed_git *p;
 739                         uint32_t total = 0, count = 0;
 740                         struct progress *progress = NULL;
 741
 742                         if (show_progress) {
 743                                 for (p = get_all_packs(the_repository); p;
 744                                      p = p->next) {
 745                                         if (open_pack_index(p))
 746                                                 continue;
 747                                         total += p->num_objects;
 748                                 }
 749
 750                                 progress = start_progress(_("Checking objects"), total);
 751                         }
 752                         for (p = get_all_packs(the_repository); p;
 753                              p = p->next) {
 754                                 /* verify gives error messages itself */
 755                                 if (verify_pack(p, fsck_obj_buffer,
 756                                                 progress, count))
 757                                         errors_found |= ERROR_PACK;
 758                                 count += p->num_objects;
 759                         }
 760                         stop_progress(&progress);
 761                 }
 762
 763                 if (fsck_finish(&fsck_obj_options))
 764                         errors_found |= ERROR_OBJECT;
 765         }
 766
 767         for (i = 0; i < argc; i++) {
 768                 const char *arg = argv[i];
 769                 struct object_id oid;
 770                 if (!get_oid(arg, &oid)) {
 771                         struct object *obj = lookup_object(the_repository,
 772                                                            oid.hash);
 773
 774                         if (!obj || !(obj->flags & HAS_OBJ)) {
 775                                 if (is_promisor_object(&oid))
 776                                         continue;
 777                                 error("%s: object missing", oid_to_hex(&oid));
 778                                 errors_found |= ERROR_OBJECT;
 779                                 continue;
 780                         }
 781
 782                         obj->flags |= USED;
 783                         if (name_objects)
 784                                 add_decoration(fsck_walk_options.object_names,
 785                                         obj, xstrdup(arg));
 786                         mark_object_reachable(obj);
 787                         continue;
 788                 }
 789                 error("invalid parameter: expected sha1, got '%s'", arg);
 790                 errors_found |= ERROR_OBJECT;
 791         }
 792
 793         /*
 794          * If we've not been given any explicit head information, do the
 795          * default ones from .git/refs. We also consider the index file
 796          * in this case (ie this implies --cache).
 797          */
 798         if (!argc) {
 799                 get_default_heads();
 800                 keep_cache_objects = 1;
 801         }
 802
 803         if (keep_cache_objects) {
 804                 verify_index_checksum = 1;
 805                 verify_ce_order = 1;
 806                 read_cache();
 807                 for (i = 0; i < active_nr; i++) {
 808                         unsigned int mode;
 809                         struct blob *blob;
 810                         struct object *obj;
 811
 812                         mode = active_cache[i]->ce_mode;
 813                         if (S_ISGITLINK(mode))
 814                                 continue;
 815                         blob = lookup_blob(the_repository,
 816                                            &active_cache[i]->oid);
 817                         if (!blob)
 818                                 continue;
 819                         obj = &blob->object;
 820                         obj->flags |= USED;
 821                         if (name_objects)
 822                                 add_decoration(fsck_walk_options.object_names,
 823                                         obj,
 824                                         xstrfmt(":%s", active_cache[i]->name));
 825                         mark_object_reachable(obj);
 826                 }
 827                 if (active_cache_tree)
 828                         fsck_cache_tree(active_cache_tree);
 829         }
 830
 831         check_connectivity();
 832
 833         if (!git_config_get_bool("core.commitgraph", &i) && i) {
 834                 struct child_process commit_graph_verify = CHILD_PROCESS_INIT;
 835                 const char *verify_argv[] = { "commit-graph", "verify", NULL, NULL, NULL };
 836
 837                 commit_graph_verify.argv = verify_argv;
 838                 commit_graph_verify.git_cmd = 1;
 839                 if (run_command(&commit_graph_verify))
 840                         errors_found |= ERROR_COMMIT_GRAPH;
 841
 842                 prepare_alt_odb(the_repository);
 843                 for (alt =  the_repository->objects->alt_odb_list; alt; alt = alt->next) {
 844                         verify_argv[2] = "--object-dir";
 845                         verify_argv[3] = alt->path;
 846                         if (run_command(&commit_graph_verify))
 847                                 errors_found |= ERROR_COMMIT_GRAPH;
 848                 }
 849         }
 850
 851         return errors_found;
 852 }