git.oblomov.eu Git - git/blob - builtin/fsck.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "commit.h"
   4 #include "tree.h"
   5 #include "blob.h"
   6 #include "tag.h"
   7 #include "refs.h"
   8 #include "pack.h"
   9 #include "cache-tree.h"
  10 #include "tree-walk.h"
  11 #include "fsck.h"
  12 #include "parse-options.h"
  13 #include "dir.h"
  14 #include "progress.h"
  15 #include "streaming.h"
  16 #include "decorate.h"
  17
  18 #define REACHABLE 0x0001
  19 #define SEEN      0x0002
  20 #define HAS_OBJ   0x0004
  21
  22 static int show_root;
  23 static int show_tags;
  24 static int show_unreachable;
  25 static int include_reflogs = 1;
  26 static int check_full = 1;
  27 static int connectivity_only;
  28 static int check_strict;
  29 static int keep_cache_objects;
  30 static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
  31 static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
  32 static struct object_id head_oid;
  33 static const char *head_points_at;
  34 static int errors_found;
  35 static int write_lost_and_found;
  36 static int verbose;
  37 static int show_progress = -1;
  38 static int show_dangling = 1;
  39 static int name_objects;
  40 #define ERROR_OBJECT 01
  41 #define ERROR_REACHABLE 02
  42 #define ERROR_PACK 04
  43 #define ERROR_REFS 010
  44
  45 static const char *describe_object(struct object *obj)
  46 {
  47         static struct strbuf buf = STRBUF_INIT;
  48         char *name = name_objects ?
  49                 lookup_decoration(fsck_walk_options.object_names, obj) : NULL;
  50
  51         strbuf_reset(&buf);
  52         strbuf_addstr(&buf, oid_to_hex(&obj->oid));
  53         if (name)
  54                 strbuf_addf(&buf, " (%s)", name);
  55
  56         return buf.buf;
  57 }
  58
  59 static const char *printable_type(struct object *obj)
  60 {
  61         const char *ret;
  62
  63         ret = typename(obj->type);
  64         if (!ret)
  65                 ret = "unknown";
  66
  67         return ret;
  68 }
  69
  70 static int fsck_config(const char *var, const char *value, void *cb)
  71 {
  72         if (strcmp(var, "fsck.skiplist") == 0) {
  73                 const char *path;
  74                 struct strbuf sb = STRBUF_INIT;
  75
  76                 if (git_config_pathname(&path, var, value))
  77                         return 1;
  78                 strbuf_addf(&sb, "skiplist=%s", path);
  79                 free((char *)path);
  80                 fsck_set_msg_types(&fsck_obj_options, sb.buf);
  81                 strbuf_release(&sb);
  82                 return 0;
  83         }
  84
  85         if (skip_prefix(var, "fsck.", &var)) {
  86                 fsck_set_msg_type(&fsck_obj_options, var, value);
  87                 return 0;
  88         }
  89
  90         return git_default_config(var, value, cb);
  91 }
  92
  93 static void objreport(struct object *obj, const char *msg_type,
  94                         const char *err)
  95 {
  96         fprintf(stderr, "%s in %s %s: %s\n",
  97                 msg_type, printable_type(obj), describe_object(obj), err);
  98 }
  99
 100 static int objerror(struct object *obj, const char *err)
 101 {
 102         errors_found |= ERROR_OBJECT;
 103         objreport(obj, "error", err);
 104         return -1;
 105 }
 106
 107 static int fsck_error_func(struct fsck_options *o,
 108         struct object *obj, int type, const char *message)
 109 {
 110         objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message);
 111         return (type == FSCK_WARN) ? 0 : 1;
 112 }
 113
 114 static struct object_array pending;
 115
 116 static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
 117 {
 118         struct object *parent = data;
 119
 120         /*
 121          * The only case data is NULL or type is OBJ_ANY is when
 122          * mark_object_reachable() calls us.  All the callers of
 123          * that function has non-NULL obj hence ...
 124          */
 125         if (!obj) {
 126                 /* ... these references to parent->fld are safe here */
 127                 printf("broken link from %7s %s\n",
 128                            printable_type(parent), describe_object(parent));
 129                 printf("broken link from %7s %s\n",
 130                            (type == OBJ_ANY ? "unknown" : typename(type)), "unknown");
 131                 errors_found |= ERROR_REACHABLE;
 132                 return 1;
 133         }
 134
 135         if (type != OBJ_ANY && obj->type != type)
 136                 /* ... and the reference to parent is safe here */
 137                 objerror(parent, "wrong object type in link");
 138
 139         if (obj->flags & REACHABLE)
 140                 return 0;
 141         obj->flags |= REACHABLE;
 142         if (!(obj->flags & HAS_OBJ)) {
 143                 if (parent && !has_object_file(&obj->oid)) {
 144                         printf("broken link from %7s %s\n",
 145                                  printable_type(parent), describe_object(parent));
 146                         printf("              to %7s %s\n",
 147                                  printable_type(obj), describe_object(obj));
 148                         errors_found |= ERROR_REACHABLE;
 149                 }
 150                 return 1;
 151         }
 152
 153         add_object_array(obj, NULL, &pending);
 154         return 0;
 155 }
 156
 157 static void mark_object_reachable(struct object *obj)
 158 {
 159         mark_object(obj, OBJ_ANY, NULL, NULL);
 160 }
 161
 162 static int traverse_one_object(struct object *obj)
 163 {
 164         int result;
 165         struct tree *tree = NULL;
 166
 167         if (obj->type == OBJ_TREE) {
 168                 tree = (struct tree *)obj;
 169                 if (parse_tree(tree) < 0)
 170                         return 1; /* error already displayed */
 171         }
 172         result = fsck_walk(obj, obj, &fsck_walk_options);
 173         if (tree)
 174                 free_tree_buffer(tree);
 175         return result;
 176 }
 177
 178 static int traverse_reachable(void)
 179 {
 180         struct progress *progress = NULL;
 181         unsigned int nr = 0;
 182         int result = 0;
 183         if (show_progress)
 184                 progress = start_progress_delay(_("Checking connectivity"), 0, 0, 2);
 185         while (pending.nr) {
 186                 struct object_array_entry *entry;
 187                 struct object *obj;
 188
 189                 entry = pending.objects + --pending.nr;
 190                 obj = entry->item;
 191                 result |= traverse_one_object(obj);
 192                 display_progress(progress, ++nr);
 193         }
 194         stop_progress(&progress);
 195         return !!result;
 196 }
 197
 198 static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
 199 {
 200         if (!obj)
 201                 return 1;
 202         obj->used = 1;
 203         return 0;
 204 }
 205
 206 /*
 207  * Check a single reachable object
 208  */
 209 static void check_reachable_object(struct object *obj)
 210 {
 211         /*
 212          * We obviously want the object to be parsed,
 213          * except if it was in a pack-file and we didn't
 214          * do a full fsck
 215          */
 216         if (!(obj->flags & HAS_OBJ)) {
 217                 if (has_sha1_pack(obj->oid.hash))
 218                         return; /* it is in pack - forget about it */
 219                 printf("missing %s %s\n", printable_type(obj),
 220                         describe_object(obj));
 221                 errors_found |= ERROR_REACHABLE;
 222                 return;
 223         }
 224 }
 225
 226 /*
 227  * Check a single unreachable object
 228  */
 229 static void check_unreachable_object(struct object *obj)
 230 {
 231         /*
 232          * Missing unreachable object? Ignore it. It's not like
 233          * we miss it (since it can't be reached), nor do we want
 234          * to complain about it being unreachable (since it does
 235          * not exist).
 236          */
 237         if (!(obj->flags & HAS_OBJ))
 238                 return;
 239
 240         /*
 241          * Unreachable object that exists? Show it if asked to,
 242          * since this is something that is prunable.
 243          */
 244         if (show_unreachable) {
 245                 printf("unreachable %s %s\n", printable_type(obj),
 246                         describe_object(obj));
 247                 return;
 248         }
 249
 250         /*
 251          * "!used" means that nothing at all points to it, including
 252          * other unreachable objects. In other words, it's the "tip"
 253          * of some set of unreachable objects, usually a commit that
 254          * got dropped.
 255          *
 256          * Such starting points are more interesting than some random
 257          * set of unreachable objects, so we show them even if the user
 258          * hasn't asked for _all_ unreachable objects. If you have
 259          * deleted a branch by mistake, this is a prime candidate to
 260          * start looking at, for example.
 261          */
 262         if (!obj->used) {
 263                 if (show_dangling)
 264                         printf("dangling %s %s\n", printable_type(obj),
 265                                describe_object(obj));
 266                 if (write_lost_and_found) {
 267                         char *filename = git_pathdup("lost-found/%s/%s",
 268                                 obj->type == OBJ_COMMIT ? "commit" : "other",
 269                                 describe_object(obj));
 270                         FILE *f;
 271
 272                         if (safe_create_leading_directories_const(filename)) {
 273                                 error("Could not create lost-found");
 274                                 free(filename);
 275                                 return;
 276                         }
 277                         if (!(f = fopen(filename, "w")))
 278                                 die_errno("Could not open '%s'", filename);
 279                         if (obj->type == OBJ_BLOB) {
 280                                 if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
 281                                         die_errno("Could not write '%s'", filename);
 282                         } else
 283                                 fprintf(f, "%s\n", describe_object(obj));
 284                         if (fclose(f))
 285                                 die_errno("Could not finish '%s'",
 286                                           filename);
 287                         free(filename);
 288                 }
 289                 return;
 290         }
 291
 292         /*
 293          * Otherwise? It's there, it's unreachable, and some other unreachable
 294          * object points to it. Ignore it - it's not interesting, and we showed
 295          * all the interesting cases above.
 296          */
 297 }
 298
 299 static void check_object(struct object *obj)
 300 {
 301         if (verbose)
 302                 fprintf(stderr, "Checking %s\n", describe_object(obj));
 303
 304         if (obj->flags & REACHABLE)
 305                 check_reachable_object(obj);
 306         else
 307                 check_unreachable_object(obj);
 308 }
 309
 310 static void check_connectivity(void)
 311 {
 312         int i, max;
 313
 314         /* Traverse the pending reachable objects */
 315         traverse_reachable();
 316
 317         /* Look up all the requirements, warn about missing objects.. */
 318         max = get_max_object_index();
 319         if (verbose)
 320                 fprintf(stderr, "Checking connectivity (%d objects)\n", max);
 321
 322         for (i = 0; i < max; i++) {
 323                 struct object *obj = get_indexed_object(i);
 324
 325                 if (obj)
 326                         check_object(obj);
 327         }
 328 }
 329
 330 static int fsck_obj(struct object *obj)
 331 {
 332         if (obj->flags & SEEN)
 333                 return 0;
 334         obj->flags |= SEEN;
 335
 336         if (verbose)
 337                 fprintf(stderr, "Checking %s %s\n",
 338                         printable_type(obj), describe_object(obj));
 339
 340         if (fsck_walk(obj, NULL, &fsck_obj_options))
 341                 objerror(obj, "broken links");
 342         if (fsck_object(obj, NULL, 0, &fsck_obj_options))
 343                 return -1;
 344
 345         if (obj->type == OBJ_TREE) {
 346                 struct tree *item = (struct tree *) obj;
 347
 348                 free_tree_buffer(item);
 349         }
 350
 351         if (obj->type == OBJ_COMMIT) {
 352                 struct commit *commit = (struct commit *) obj;
 353
 354                 free_commit_buffer(commit);
 355
 356                 if (!commit->parents && show_root)
 357                         printf("root %s\n", describe_object(&commit->object));
 358         }
 359
 360         if (obj->type == OBJ_TAG) {
 361                 struct tag *tag = (struct tag *) obj;
 362
 363                 if (show_tags && tag->tagged) {
 364                         printf("tagged %s %s", printable_type(tag->tagged),
 365                                 describe_object(tag->tagged));
 366                         printf(" (%s) in %s\n", tag->tag,
 367                                 describe_object(&tag->object));
 368                 }
 369         }
 370
 371         return 0;
 372 }
 373
 374 static int fsck_sha1(const unsigned char *sha1)
 375 {
 376         struct object *obj = parse_object(sha1);
 377         if (!obj) {
 378                 errors_found |= ERROR_OBJECT;
 379                 return error("%s: object corrupt or missing",
 380                              sha1_to_hex(sha1));
 381         }
 382         obj->flags |= HAS_OBJ;
 383         return fsck_obj(obj);
 384 }
 385
 386 static int fsck_obj_buffer(const unsigned char *sha1, enum object_type type,
 387                            unsigned long size, void *buffer, int *eaten)
 388 {
 389         /*
 390          * Note, buffer may be NULL if type is OBJ_BLOB. See
 391          * verify_packfile(), data_valid variable for details.
 392          */
 393         struct object *obj;
 394         obj = parse_object_buffer(sha1, type, size, buffer, eaten);
 395         if (!obj) {
 396                 errors_found |= ERROR_OBJECT;
 397                 return error("%s: object corrupt or missing", sha1_to_hex(sha1));
 398         }
 399         obj->flags = HAS_OBJ;
 400         return fsck_obj(obj);
 401 }
 402
 403 static int default_refs;
 404
 405 static void fsck_handle_reflog_sha1(const char *refname, unsigned char *sha1,
 406         unsigned long timestamp)
 407 {
 408         struct object *obj;
 409
 410         if (!is_null_sha1(sha1)) {
 411                 obj = lookup_object(sha1);
 412                 if (obj && (obj->flags & HAS_OBJ)) {
 413                         if (timestamp && name_objects)
 414                                 add_decoration(fsck_walk_options.object_names,
 415                                         obj,
 416                                         xstrfmt("%s@{%ld}", refname, timestamp));
 417                         obj->used = 1;
 418                         mark_object_reachable(obj);
 419                 } else {
 420                         error("%s: invalid reflog entry %s", refname, sha1_to_hex(sha1));
 421                         errors_found |= ERROR_REACHABLE;
 422                 }
 423         }
 424 }
 425
 426 static int fsck_handle_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 427                 const char *email, unsigned long timestamp, int tz,
 428                 const char *message, void *cb_data)
 429 {
 430         const char *refname = cb_data;
 431
 432         if (verbose)
 433                 fprintf(stderr, "Checking reflog %s->%s\n",
 434                         sha1_to_hex(osha1), sha1_to_hex(nsha1));
 435
 436         fsck_handle_reflog_sha1(refname, osha1, 0);
 437         fsck_handle_reflog_sha1(refname, nsha1, timestamp);
 438         return 0;
 439 }
 440
 441 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
 442                               int flag, void *cb_data)
 443 {
 444         for_each_reflog_ent(logname, fsck_handle_reflog_ent, (void *)logname);
 445         return 0;
 446 }
 447
 448 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 449                            int flag, void *cb_data)
 450 {
 451         struct object *obj;
 452
 453         obj = parse_object(oid->hash);
 454         if (!obj) {
 455                 error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
 456                 errors_found |= ERROR_REACHABLE;
 457                 /* We'll continue with the rest despite the error.. */
 458                 return 0;
 459         }
 460         if (obj->type != OBJ_COMMIT && is_branch(refname)) {
 461                 error("%s: not a commit", refname);
 462                 errors_found |= ERROR_REFS;
 463         }
 464         default_refs++;
 465         obj->used = 1;
 466         if (name_objects)
 467                 add_decoration(fsck_walk_options.object_names,
 468                         obj, xstrdup(refname));
 469         mark_object_reachable(obj);
 470
 471         return 0;
 472 }
 473
 474 static void get_default_heads(void)
 475 {
 476         if (head_points_at && !is_null_oid(&head_oid))
 477                 fsck_handle_ref("HEAD", &head_oid, 0, NULL);
 478         for_each_rawref(fsck_handle_ref, NULL);
 479         if (include_reflogs)
 480                 for_each_reflog(fsck_handle_reflog, NULL);
 481
 482         /*
 483          * Not having any default heads isn't really fatal, but
 484          * it does mean that "--unreachable" no longer makes any
 485          * sense (since in this case everything will obviously
 486          * be unreachable by definition.
 487          *
 488          * Showing dangling objects is valid, though (as those
 489          * dangling objects are likely lost heads).
 490          *
 491          * So we just print a warning about it, and clear the
 492          * "show_unreachable" flag.
 493          */
 494         if (!default_refs) {
 495                 fprintf(stderr, "notice: No default references\n");
 496                 show_unreachable = 0;
 497         }
 498 }
 499
 500 static int fsck_loose(const unsigned char *sha1, const char *path, void *data)
 501 {
 502         if (fsck_sha1(sha1))
 503                 errors_found |= ERROR_OBJECT;
 504         return 0;
 505 }
 506
 507 static int fsck_cruft(const char *basename, const char *path, void *data)
 508 {
 509         if (!starts_with(basename, "tmp_obj_"))
 510                 fprintf(stderr, "bad sha1 file: %s\n", path);
 511         return 0;
 512 }
 513
 514 static int fsck_subdir(int nr, const char *path, void *progress)
 515 {
 516         display_progress(progress, nr + 1);
 517         return 0;
 518 }
 519
 520 static void fsck_object_dir(const char *path)
 521 {
 522         struct progress *progress = NULL;
 523
 524         if (verbose)
 525                 fprintf(stderr, "Checking object directory\n");
 526
 527         if (show_progress)
 528                 progress = start_progress(_("Checking object directories"), 256);
 529
 530         for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
 531                                       progress);
 532         display_progress(progress, 256);
 533         stop_progress(&progress);
 534 }
 535
 536 static int fsck_head_link(void)
 537 {
 538         int null_is_error = 0;
 539
 540         if (verbose)
 541                 fprintf(stderr, "Checking HEAD link\n");
 542
 543         head_points_at = resolve_ref_unsafe("HEAD", 0, head_oid.hash, NULL);
 544         if (!head_points_at) {
 545                 errors_found |= ERROR_REFS;
 546                 return error("Invalid HEAD");
 547         }
 548         if (!strcmp(head_points_at, "HEAD"))
 549                 /* detached HEAD */
 550                 null_is_error = 1;
 551         else if (!starts_with(head_points_at, "refs/heads/")) {
 552                 errors_found |= ERROR_REFS;
 553                 return error("HEAD points to something strange (%s)",
 554                              head_points_at);
 555         }
 556         if (is_null_oid(&head_oid)) {
 557                 if (null_is_error) {
 558                         errors_found |= ERROR_REFS;
 559                         return error("HEAD: detached HEAD points at nothing");
 560                 }
 561                 fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
 562                         head_points_at + 11);
 563         }
 564         return 0;
 565 }
 566
 567 static int fsck_cache_tree(struct cache_tree *it)
 568 {
 569         int i;
 570         int err = 0;
 571
 572         if (verbose)
 573                 fprintf(stderr, "Checking cache tree\n");
 574
 575         if (0 <= it->entry_count) {
 576                 struct object *obj = parse_object(it->sha1);
 577                 if (!obj) {
 578                         error("%s: invalid sha1 pointer in cache-tree",
 579                               sha1_to_hex(it->sha1));
 580                         errors_found |= ERROR_REFS;
 581                         return 1;
 582                 }
 583                 obj->used = 1;
 584                 if (name_objects)
 585                         add_decoration(fsck_walk_options.object_names,
 586                                 obj, xstrdup(":"));
 587                 mark_object_reachable(obj);
 588                 if (obj->type != OBJ_TREE)
 589                         err |= objerror(obj, "non-tree in cache-tree");
 590         }
 591         for (i = 0; i < it->subtree_nr; i++)
 592                 err |= fsck_cache_tree(it->down[i]->cache_tree);
 593         return err;
 594 }
 595
 596 static void mark_object_for_connectivity(const unsigned char *sha1)
 597 {
 598         struct object *obj = lookup_object(sha1);
 599
 600         /*
 601          * Setting the object type here isn't strictly necessary for a
 602          * connectivity check. In most cases, our walk will expect a certain
 603          * type (e.g., a tree referencing a blob) and will use lookup_blob() to
 604          * assign the type. But doing it here has two advantages:
 605          *
 606          *   1. When the fsck_walk code looks at objects that _don't_ come from
 607          *      links (e.g., the tip of a ref), it may complain about the
 608          *      "unknown object type".
 609          *
 610          *   2. This serves as a nice cross-check that the graph links are
 611          *      sane. So --connectivity-only does not check that the bits of
 612          *      blobs are not corrupted, but it _does_ check that 100644 tree
 613          *      entries point to blobs, and so forth.
 614          *
 615          * Unfortunately we can't just use parse_object() here, because the
 616          * whole point of --connectivity-only is to avoid reading the object
 617          * data more than necessary.
 618          */
 619         if (!obj || obj->type == OBJ_NONE) {
 620                 enum object_type type = sha1_object_info(sha1, NULL);
 621                 switch (type) {
 622                 case OBJ_BAD:
 623                         error("%s: unable to read object type",
 624                               sha1_to_hex(sha1));
 625                         break;
 626                 case OBJ_COMMIT:
 627                         obj = (struct object *)lookup_commit(sha1);
 628                         break;
 629                 case OBJ_TREE:
 630                         obj = (struct object *)lookup_tree(sha1);
 631                         break;
 632                 case OBJ_BLOB:
 633                         obj = (struct object *)lookup_blob(sha1);
 634                         break;
 635                 case OBJ_TAG:
 636                         obj = (struct object *)lookup_tag(sha1);
 637                         break;
 638                 default:
 639                         error("%s: unknown object type %d",
 640                               sha1_to_hex(sha1), type);
 641                 }
 642
 643                 if (!obj || obj->type == OBJ_NONE) {
 644                         errors_found |= ERROR_OBJECT;
 645                         return;
 646                 }
 647         }
 648
 649         obj->flags |= HAS_OBJ;
 650 }
 651
 652 static int mark_loose_for_connectivity(const unsigned char *sha1,
 653                                        const char *path,
 654                                        void *data)
 655 {
 656         mark_object_for_connectivity(sha1);
 657         return 0;
 658 }
 659
 660 static int mark_packed_for_connectivity(const unsigned char *sha1,
 661                                         struct packed_git *pack,
 662                                         uint32_t pos,
 663                                         void *data)
 664 {
 665         mark_object_for_connectivity(sha1);
 666         return 0;
 667 }
 668
 669 static char const * const fsck_usage[] = {
 670         N_("git fsck [<options>] [<object>...]"),
 671         NULL
 672 };
 673
 674 static struct option fsck_opts[] = {
 675         OPT__VERBOSE(&verbose, N_("be verbose")),
 676         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
 677         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
 678         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
 679         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
 680         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
 681         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
 682         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
 683         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
 684         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
 685         OPT_BOOL(0, "lost-found", &write_lost_and_found,
 686                                 N_("write dangling objects in .git/lost-found")),
 687         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 688         OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
 689         OPT_END(),
 690 };
 691
 692 int cmd_fsck(int argc, const char **argv, const char *prefix)
 693 {
 694         int i, heads;
 695         struct alternate_object_database *alt;
 696
 697         errors_found = 0;
 698         check_replace_refs = 0;
 699
 700         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 701
 702         fsck_walk_options.walk = mark_object;
 703         fsck_obj_options.walk = mark_used;
 704         fsck_obj_options.error_func = fsck_error_func;
 705         if (check_strict)
 706                 fsck_obj_options.strict = 1;
 707
 708         if (show_progress == -1)
 709                 show_progress = isatty(2);
 710         if (verbose)
 711                 show_progress = 0;
 712
 713         if (write_lost_and_found) {
 714                 check_full = 1;
 715                 include_reflogs = 0;
 716         }
 717
 718         if (name_objects)
 719                 fsck_walk_options.object_names =
 720                         xcalloc(1, sizeof(struct decoration));
 721
 722         git_config(fsck_config, NULL);
 723
 724         fsck_head_link();
 725         if (connectivity_only) {
 726                 for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
 727                 for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
 728         } else {
 729                 fsck_object_dir(get_object_directory());
 730
 731                 prepare_alt_odb();
 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                         prepare_packed_git();
 741
 742                         if (show_progress) {
 743                                 for (p = packed_git; p; p = p->next) {
 744                                         if (open_pack_index(p))
 745                                                 continue;
 746                                         total += p->num_objects;
 747                                 }
 748
 749                                 progress = start_progress(_("Checking objects"), total);
 750                         }
 751                         for (p = packed_git; p; 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
 762         heads = 0;
 763         for (i = 0; i < argc; i++) {
 764                 const char *arg = argv[i];
 765                 unsigned char sha1[20];
 766                 if (!get_sha1(arg, sha1)) {
 767                         struct object *obj = lookup_object(sha1);
 768
 769                         if (!obj || !(obj->flags & HAS_OBJ)) {
 770                                 error("%s: object missing", sha1_to_hex(sha1));
 771                                 errors_found |= ERROR_OBJECT;
 772                                 continue;
 773                         }
 774
 775                         obj->used = 1;
 776                         if (name_objects)
 777                                 add_decoration(fsck_walk_options.object_names,
 778                                         obj, xstrdup(arg));
 779                         mark_object_reachable(obj);
 780                         heads++;
 781                         continue;
 782                 }
 783                 error("invalid parameter: expected sha1, got '%s'", arg);
 784                 errors_found |= ERROR_OBJECT;
 785         }
 786
 787         /*
 788          * If we've not been given any explicit head information, do the
 789          * default ones from .git/refs. We also consider the index file
 790          * in this case (ie this implies --cache).
 791          */
 792         if (!argc) {
 793                 get_default_heads();
 794                 keep_cache_objects = 1;
 795         }
 796
 797         if (keep_cache_objects) {
 798                 read_cache();
 799                 for (i = 0; i < active_nr; i++) {
 800                         unsigned int mode;
 801                         struct blob *blob;
 802                         struct object *obj;
 803
 804                         mode = active_cache[i]->ce_mode;
 805                         if (S_ISGITLINK(mode))
 806                                 continue;
 807                         blob = lookup_blob(active_cache[i]->oid.hash);
 808                         if (!blob)
 809                                 continue;
 810                         obj = &blob->object;
 811                         obj->used = 1;
 812                         if (name_objects)
 813                                 add_decoration(fsck_walk_options.object_names,
 814                                         obj,
 815                                         xstrfmt(":%s", active_cache[i]->name));
 816                         mark_object_reachable(obj);
 817                 }
 818                 if (active_cache_tree)
 819                         fsck_cache_tree(active_cache_tree);
 820         }
 821
 822         check_connectivity();
 823         return errors_found;
 824 }