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