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
  17 #define REACHABLE 0x0001
  18 #define SEEN      0x0002
  19 #define HAS_OBJ   0x0004
  20
  21 static int show_root;
  22 static int show_tags;
  23 static int show_unreachable;
  24 static int include_reflogs = 1;
  25 static int check_full = 1;
  26 static int connectivity_only;
  27 static int check_strict;
  28 static int keep_cache_objects;
  29 static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
  30 static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
  31 static struct object_id head_oid;
  32 static const char *head_points_at;
  33 static int errors_found;
  34 static int write_lost_and_found;
  35 static int verbose;
  36 static int show_progress = -1;
  37 static int show_dangling = 1;
  38 #define ERROR_OBJECT 01
  39 #define ERROR_REACHABLE 02
  40 #define ERROR_PACK 04
  41 #define ERROR_REFS 010
  42
  43 #ifdef NO_D_INO_IN_DIRENT
  44 #define SORT_DIRENT 0
  45 #define DIRENT_SORT_HINT(de) 0
  46 #else
  47 #define SORT_DIRENT 1
  48 #define DIRENT_SORT_HINT(de) ((de)->d_ino)
  49 #endif
  50
  51 static int fsck_config(const char *var, const char *value, void *cb)
  52 {
  53         if (strcmp(var, "fsck.skiplist") == 0) {
  54                 const char *path;
  55                 struct strbuf sb = STRBUF_INIT;
  56
  57                 if (git_config_pathname(&path, var, value))
  58                         return 1;
  59                 strbuf_addf(&sb, "skiplist=%s", path);
  60                 free((char *)path);
  61                 fsck_set_msg_types(&fsck_obj_options, sb.buf);
  62                 strbuf_release(&sb);
  63                 return 0;
  64         }
  65
  66         if (skip_prefix(var, "fsck.", &var)) {
  67                 fsck_set_msg_type(&fsck_obj_options, var, value);
  68                 return 0;
  69         }
  70
  71         return git_default_config(var, value, cb);
  72 }
  73
  74 static void objreport(struct object *obj, const char *msg_type,
  75                         const char *err)
  76 {
  77         fprintf(stderr, "%s in %s %s: %s\n",
  78                 msg_type, typename(obj->type), sha1_to_hex(obj->sha1), err);
  79 }
  80
  81 static int objerror(struct object *obj, const char *err)
  82 {
  83         errors_found |= ERROR_OBJECT;
  84         objreport(obj, "error", err);
  85         return -1;
  86 }
  87
  88 static int fsck_error_func(struct object *obj, int type, const char *message)
  89 {
  90         objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message);
  91         return (type == FSCK_WARN) ? 0 : 1;
  92 }
  93
  94 static struct object_array pending;
  95
  96 static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
  97 {
  98         struct object *parent = data;
  99
 100         /*
 101          * The only case data is NULL or type is OBJ_ANY is when
 102          * mark_object_reachable() calls us.  All the callers of
 103          * that function has non-NULL obj hence ...
 104          */
 105         if (!obj) {
 106                 /* ... these references to parent->fld are safe here */
 107                 printf("broken link from %7s %s\n",
 108                            typename(parent->type), sha1_to_hex(parent->sha1));
 109                 printf("broken link from %7s %s\n",
 110                            (type == OBJ_ANY ? "unknown" : typename(type)), "unknown");
 111                 errors_found |= ERROR_REACHABLE;
 112                 return 1;
 113         }
 114
 115         if (type != OBJ_ANY && obj->type != type)
 116                 /* ... and the reference to parent is safe here */
 117                 objerror(parent, "wrong object type in link");
 118
 119         if (obj->flags & REACHABLE)
 120                 return 0;
 121         obj->flags |= REACHABLE;
 122         if (!(obj->flags & HAS_OBJ)) {
 123                 if (parent && !has_sha1_file(obj->sha1)) {
 124                         printf("broken link from %7s %s\n",
 125                                  typename(parent->type), sha1_to_hex(parent->sha1));
 126                         printf("              to %7s %s\n",
 127                                  typename(obj->type), sha1_to_hex(obj->sha1));
 128                         errors_found |= ERROR_REACHABLE;
 129                 }
 130                 return 1;
 131         }
 132
 133         add_object_array(obj, NULL, &pending);
 134         return 0;
 135 }
 136
 137 static void mark_object_reachable(struct object *obj)
 138 {
 139         mark_object(obj, OBJ_ANY, NULL, NULL);
 140 }
 141
 142 static int traverse_one_object(struct object *obj)
 143 {
 144         int result;
 145         struct tree *tree = NULL;
 146
 147         if (obj->type == OBJ_TREE) {
 148                 tree = (struct tree *)obj;
 149                 if (parse_tree(tree) < 0)
 150                         return 1; /* error already displayed */
 151         }
 152         result = fsck_walk(obj, obj, &fsck_walk_options);
 153         if (tree)
 154                 free_tree_buffer(tree);
 155         return result;
 156 }
 157
 158 static int traverse_reachable(void)
 159 {
 160         struct progress *progress = NULL;
 161         unsigned int nr = 0;
 162         int result = 0;
 163         if (show_progress)
 164                 progress = start_progress_delay(_("Checking connectivity"), 0, 0, 2);
 165         while (pending.nr) {
 166                 struct object_array_entry *entry;
 167                 struct object *obj;
 168
 169                 entry = pending.objects + --pending.nr;
 170                 obj = entry->item;
 171                 result |= traverse_one_object(obj);
 172                 display_progress(progress, ++nr);
 173         }
 174         stop_progress(&progress);
 175         return !!result;
 176 }
 177
 178 static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
 179 {
 180         if (!obj)
 181                 return 1;
 182         obj->used = 1;
 183         return 0;
 184 }
 185
 186 /*
 187  * Check a single reachable object
 188  */
 189 static void check_reachable_object(struct object *obj)
 190 {
 191         /*
 192          * We obviously want the object to be parsed,
 193          * except if it was in a pack-file and we didn't
 194          * do a full fsck
 195          */
 196         if (!(obj->flags & HAS_OBJ)) {
 197                 if (has_sha1_pack(obj->sha1))
 198                         return; /* it is in pack - forget about it */
 199                 if (connectivity_only && has_sha1_file(obj->sha1))
 200                         return;
 201                 printf("missing %s %s\n", typename(obj->type), sha1_to_hex(obj->sha1));
 202                 errors_found |= ERROR_REACHABLE;
 203                 return;
 204         }
 205 }
 206
 207 /*
 208  * Check a single unreachable object
 209  */
 210 static void check_unreachable_object(struct object *obj)
 211 {
 212         /*
 213          * Missing unreachable object? Ignore it. It's not like
 214          * we miss it (since it can't be reached), nor do we want
 215          * to complain about it being unreachable (since it does
 216          * not exist).
 217          */
 218         if (!obj->parsed)
 219                 return;
 220
 221         /*
 222          * Unreachable object that exists? Show it if asked to,
 223          * since this is something that is prunable.
 224          */
 225         if (show_unreachable) {
 226                 printf("unreachable %s %s\n", typename(obj->type), sha1_to_hex(obj->sha1));
 227                 return;
 228         }
 229
 230         /*
 231          * "!used" means that nothing at all points to it, including
 232          * other unreachable objects. In other words, it's the "tip"
 233          * of some set of unreachable objects, usually a commit that
 234          * got dropped.
 235          *
 236          * Such starting points are more interesting than some random
 237          * set of unreachable objects, so we show them even if the user
 238          * hasn't asked for _all_ unreachable objects. If you have
 239          * deleted a branch by mistake, this is a prime candidate to
 240          * start looking at, for example.
 241          */
 242         if (!obj->used) {
 243                 if (show_dangling)
 244                         printf("dangling %s %s\n", typename(obj->type),
 245                                sha1_to_hex(obj->sha1));
 246                 if (write_lost_and_found) {
 247                         char *filename = git_pathdup("lost-found/%s/%s",
 248                                 obj->type == OBJ_COMMIT ? "commit" : "other",
 249                                 sha1_to_hex(obj->sha1));
 250                         FILE *f;
 251
 252                         if (safe_create_leading_directories_const(filename)) {
 253                                 error("Could not create lost-found");
 254                                 free(filename);
 255                                 return;
 256                         }
 257                         if (!(f = fopen(filename, "w")))
 258                                 die_errno("Could not open '%s'", filename);
 259                         if (obj->type == OBJ_BLOB) {
 260                                 if (stream_blob_to_fd(fileno(f), obj->sha1, NULL, 1))
 261                                         die_errno("Could not write '%s'", filename);
 262                         } else
 263                                 fprintf(f, "%s\n", sha1_to_hex(obj->sha1));
 264                         if (fclose(f))
 265                                 die_errno("Could not finish '%s'",
 266                                           filename);
 267                         free(filename);
 268                 }
 269                 return;
 270         }
 271
 272         /*
 273          * Otherwise? It's there, it's unreachable, and some other unreachable
 274          * object points to it. Ignore it - it's not interesting, and we showed
 275          * all the interesting cases above.
 276          */
 277 }
 278
 279 static void check_object(struct object *obj)
 280 {
 281         if (verbose)
 282                 fprintf(stderr, "Checking %s\n", sha1_to_hex(obj->sha1));
 283
 284         if (obj->flags & REACHABLE)
 285                 check_reachable_object(obj);
 286         else
 287                 check_unreachable_object(obj);
 288 }
 289
 290 static void check_connectivity(void)
 291 {
 292         int i, max;
 293
 294         /* Traverse the pending reachable objects */
 295         traverse_reachable();
 296
 297         /* Look up all the requirements, warn about missing objects.. */
 298         max = get_max_object_index();
 299         if (verbose)
 300                 fprintf(stderr, "Checking connectivity (%d objects)\n", max);
 301
 302         for (i = 0; i < max; i++) {
 303                 struct object *obj = get_indexed_object(i);
 304
 305                 if (obj)
 306                         check_object(obj);
 307         }
 308 }
 309
 310 static int fsck_obj(struct object *obj)
 311 {
 312         if (obj->flags & SEEN)
 313                 return 0;
 314         obj->flags |= SEEN;
 315
 316         if (verbose)
 317                 fprintf(stderr, "Checking %s %s\n",
 318                         typename(obj->type), sha1_to_hex(obj->sha1));
 319
 320         if (fsck_walk(obj, NULL, &fsck_obj_options))
 321                 objerror(obj, "broken links");
 322         if (fsck_object(obj, NULL, 0, &fsck_obj_options))
 323                 return -1;
 324
 325         if (obj->type == OBJ_TREE) {
 326                 struct tree *item = (struct tree *) obj;
 327
 328                 free_tree_buffer(item);
 329         }
 330
 331         if (obj->type == OBJ_COMMIT) {
 332                 struct commit *commit = (struct commit *) obj;
 333
 334                 free_commit_buffer(commit);
 335
 336                 if (!commit->parents && show_root)
 337                         printf("root %s\n", sha1_to_hex(commit->object.sha1));
 338         }
 339
 340         if (obj->type == OBJ_TAG) {
 341                 struct tag *tag = (struct tag *) obj;
 342
 343                 if (show_tags && tag->tagged) {
 344                         printf("tagged %s %s", typename(tag->tagged->type), sha1_to_hex(tag->tagged->sha1));
 345                         printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1));
 346                 }
 347         }
 348
 349         return 0;
 350 }
 351
 352 static int fsck_sha1(const unsigned char *sha1)
 353 {
 354         struct object *obj = parse_object(sha1);
 355         if (!obj) {
 356                 errors_found |= ERROR_OBJECT;
 357                 return error("%s: object corrupt or missing",
 358                              sha1_to_hex(sha1));
 359         }
 360         obj->flags |= HAS_OBJ;
 361         return fsck_obj(obj);
 362 }
 363
 364 static int fsck_obj_buffer(const unsigned char *sha1, enum object_type type,
 365                            unsigned long size, void *buffer, int *eaten)
 366 {
 367         struct object *obj;
 368         obj = parse_object_buffer(sha1, type, size, buffer, eaten);
 369         if (!obj) {
 370                 errors_found |= ERROR_OBJECT;
 371                 return error("%s: object corrupt or missing", sha1_to_hex(sha1));
 372         }
 373         obj->flags = HAS_OBJ;
 374         return fsck_obj(obj);
 375 }
 376
 377 /*
 378  * This is the sorting chunk size: make it reasonably
 379  * big so that we can sort well..
 380  */
 381 #define MAX_SHA1_ENTRIES (1024)
 382
 383 struct sha1_entry {
 384         unsigned long ino;
 385         unsigned char sha1[20];
 386 };
 387
 388 static struct {
 389         unsigned long nr;
 390         struct sha1_entry *entry[MAX_SHA1_ENTRIES];
 391 } sha1_list;
 392
 393 static int ino_compare(const void *_a, const void *_b)
 394 {
 395         const struct sha1_entry *a = _a, *b = _b;
 396         unsigned long ino1 = a->ino, ino2 = b->ino;
 397         return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
 398 }
 399
 400 static void fsck_sha1_list(void)
 401 {
 402         int i, nr = sha1_list.nr;
 403
 404         if (SORT_DIRENT)
 405                 qsort(sha1_list.entry, nr,
 406                       sizeof(struct sha1_entry *), ino_compare);
 407         for (i = 0; i < nr; i++) {
 408                 struct sha1_entry *entry = sha1_list.entry[i];
 409                 unsigned char *sha1 = entry->sha1;
 410
 411                 sha1_list.entry[i] = NULL;
 412                 if (fsck_sha1(sha1))
 413                         errors_found |= ERROR_OBJECT;
 414                 free(entry);
 415         }
 416         sha1_list.nr = 0;
 417 }
 418
 419 static void add_sha1_list(unsigned char *sha1, unsigned long ino)
 420 {
 421         struct sha1_entry *entry = xmalloc(sizeof(*entry));
 422         int nr;
 423
 424         entry->ino = ino;
 425         hashcpy(entry->sha1, sha1);
 426         nr = sha1_list.nr;
 427         if (nr == MAX_SHA1_ENTRIES) {
 428                 fsck_sha1_list();
 429                 nr = 0;
 430         }
 431         sha1_list.entry[nr] = entry;
 432         sha1_list.nr = ++nr;
 433 }
 434
 435 static inline int is_loose_object_file(struct dirent *de,
 436                                        char *name, unsigned char *sha1)
 437 {
 438         if (strlen(de->d_name) != 38)
 439                 return 0;
 440         memcpy(name + 2, de->d_name, 39);
 441         return !get_sha1_hex(name, sha1);
 442 }
 443
 444 static void fsck_dir(int i, char *path)
 445 {
 446         DIR *dir = opendir(path);
 447         struct dirent *de;
 448         char name[100];
 449
 450         if (!dir)
 451                 return;
 452
 453         if (verbose)
 454                 fprintf(stderr, "Checking directory %s\n", path);
 455
 456         sprintf(name, "%02x", i);
 457         while ((de = readdir(dir)) != NULL) {
 458                 unsigned char sha1[20];
 459
 460                 if (is_dot_or_dotdot(de->d_name))
 461                         continue;
 462                 if (is_loose_object_file(de, name, sha1)) {
 463                         add_sha1_list(sha1, DIRENT_SORT_HINT(de));
 464                         continue;
 465                 }
 466                 if (starts_with(de->d_name, "tmp_obj_"))
 467                         continue;
 468                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 469         }
 470         closedir(dir);
 471 }
 472
 473 static int default_refs;
 474
 475 static void fsck_handle_reflog_sha1(const char *refname, unsigned char *sha1)
 476 {
 477         struct object *obj;
 478
 479         if (!is_null_sha1(sha1)) {
 480                 obj = lookup_object(sha1);
 481                 if (obj) {
 482                         obj->used = 1;
 483                         mark_object_reachable(obj);
 484                 } else {
 485                         error("%s: invalid reflog entry %s", refname, sha1_to_hex(sha1));
 486                         errors_found |= ERROR_REACHABLE;
 487                 }
 488         }
 489 }
 490
 491 static int fsck_handle_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 492                 const char *email, unsigned long timestamp, int tz,
 493                 const char *message, void *cb_data)
 494 {
 495         const char *refname = cb_data;
 496
 497         if (verbose)
 498                 fprintf(stderr, "Checking reflog %s->%s\n",
 499                         sha1_to_hex(osha1), sha1_to_hex(nsha1));
 500
 501         fsck_handle_reflog_sha1(refname, osha1);
 502         fsck_handle_reflog_sha1(refname, nsha1);
 503         return 0;
 504 }
 505
 506 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
 507                               int flag, void *cb_data)
 508 {
 509         for_each_reflog_ent(logname, fsck_handle_reflog_ent, (void *)logname);
 510         return 0;
 511 }
 512
 513 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 514                            int flag, void *cb_data)
 515 {
 516         struct object *obj;
 517
 518         obj = parse_object(oid->hash);
 519         if (!obj) {
 520                 error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
 521                 errors_found |= ERROR_REACHABLE;
 522                 /* We'll continue with the rest despite the error.. */
 523                 return 0;
 524         }
 525         if (obj->type != OBJ_COMMIT && is_branch(refname)) {
 526                 error("%s: not a commit", refname);
 527                 errors_found |= ERROR_REFS;
 528         }
 529         default_refs++;
 530         obj->used = 1;
 531         mark_object_reachable(obj);
 532
 533         return 0;
 534 }
 535
 536 static void get_default_heads(void)
 537 {
 538         if (head_points_at && !is_null_oid(&head_oid))
 539                 fsck_handle_ref("HEAD", &head_oid, 0, NULL);
 540         for_each_rawref(fsck_handle_ref, NULL);
 541         if (include_reflogs)
 542                 for_each_reflog(fsck_handle_reflog, NULL);
 543
 544         /*
 545          * Not having any default heads isn't really fatal, but
 546          * it does mean that "--unreachable" no longer makes any
 547          * sense (since in this case everything will obviously
 548          * be unreachable by definition.
 549          *
 550          * Showing dangling objects is valid, though (as those
 551          * dangling objects are likely lost heads).
 552          *
 553          * So we just print a warning about it, and clear the
 554          * "show_unreachable" flag.
 555          */
 556         if (!default_refs) {
 557                 fprintf(stderr, "notice: No default references\n");
 558                 show_unreachable = 0;
 559         }
 560 }
 561
 562 static void fsck_object_dir(const char *path)
 563 {
 564         int i;
 565         struct progress *progress = NULL;
 566
 567         if (verbose)
 568                 fprintf(stderr, "Checking object directory\n");
 569
 570         if (show_progress)
 571                 progress = start_progress(_("Checking object directories"), 256);
 572         for (i = 0; i < 256; i++) {
 573                 static char dir[4096];
 574                 sprintf(dir, "%s/%02x", path, i);
 575                 fsck_dir(i, dir);
 576                 display_progress(progress, i+1);
 577         }
 578         stop_progress(&progress);
 579         fsck_sha1_list();
 580 }
 581
 582 static int fsck_head_link(void)
 583 {
 584         int flag;
 585         int null_is_error = 0;
 586
 587         if (verbose)
 588                 fprintf(stderr, "Checking HEAD link\n");
 589
 590         head_points_at = resolve_ref_unsafe("HEAD", 0, head_oid.hash, &flag);
 591         if (!head_points_at) {
 592                 errors_found |= ERROR_REFS;
 593                 return error("Invalid HEAD");
 594         }
 595         if (!strcmp(head_points_at, "HEAD"))
 596                 /* detached HEAD */
 597                 null_is_error = 1;
 598         else if (!starts_with(head_points_at, "refs/heads/")) {
 599                 errors_found |= ERROR_REFS;
 600                 return error("HEAD points to something strange (%s)",
 601                              head_points_at);
 602         }
 603         if (is_null_oid(&head_oid)) {
 604                 if (null_is_error) {
 605                         errors_found |= ERROR_REFS;
 606                         return error("HEAD: detached HEAD points at nothing");
 607                 }
 608                 fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
 609                         head_points_at + 11);
 610         }
 611         return 0;
 612 }
 613
 614 static int fsck_cache_tree(struct cache_tree *it)
 615 {
 616         int i;
 617         int err = 0;
 618
 619         if (verbose)
 620                 fprintf(stderr, "Checking cache tree\n");
 621
 622         if (0 <= it->entry_count) {
 623                 struct object *obj = parse_object(it->sha1);
 624                 if (!obj) {
 625                         error("%s: invalid sha1 pointer in cache-tree",
 626                               sha1_to_hex(it->sha1));
 627                         errors_found |= ERROR_REFS;
 628                         return 1;
 629                 }
 630                 obj->used = 1;
 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 char const * const fsck_usage[] = {
 641         N_("git fsck [<options>] [<object>...]"),
 642         NULL
 643 };
 644
 645 static struct option fsck_opts[] = {
 646         OPT__VERBOSE(&verbose, N_("be verbose")),
 647         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
 648         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
 649         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
 650         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
 651         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
 652         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
 653         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
 654         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
 655         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
 656         OPT_BOOL(0, "lost-found", &write_lost_and_found,
 657                                 N_("write dangling objects in .git/lost-found")),
 658         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 659         OPT_END(),
 660 };
 661
 662 int cmd_fsck(int argc, const char **argv, const char *prefix)
 663 {
 664         int i, heads;
 665         struct alternate_object_database *alt;
 666
 667         errors_found = 0;
 668         check_replace_refs = 0;
 669
 670         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 671
 672         fsck_walk_options.walk = mark_object;
 673         fsck_obj_options.walk = mark_used;
 674         fsck_obj_options.error_func = fsck_error_func;
 675         if (check_strict)
 676                 fsck_obj_options.strict = 1;
 677
 678         if (show_progress == -1)
 679                 show_progress = isatty(2);
 680         if (verbose)
 681                 show_progress = 0;
 682
 683         if (write_lost_and_found) {
 684                 check_full = 1;
 685                 include_reflogs = 0;
 686         }
 687
 688         git_config(fsck_config, NULL);
 689
 690         fsck_head_link();
 691         if (!connectivity_only)
 692                 fsck_object_dir(get_object_directory());
 693
 694         prepare_alt_odb();
 695         for (alt = alt_odb_list; alt; alt = alt->next) {
 696                 char namebuf[PATH_MAX];
 697                 int namelen = alt->name - alt->base;
 698                 memcpy(namebuf, alt->base, namelen);
 699                 namebuf[namelen - 1] = 0;
 700                 fsck_object_dir(namebuf);
 701         }
 702
 703         if (check_full) {
 704                 struct packed_git *p;
 705                 uint32_t total = 0, count = 0;
 706                 struct progress *progress = NULL;
 707
 708                 prepare_packed_git();
 709
 710                 if (show_progress) {
 711                         for (p = packed_git; p; p = p->next) {
 712                                 if (open_pack_index(p))
 713                                         continue;
 714                                 total += p->num_objects;
 715                         }
 716
 717                         progress = start_progress(_("Checking objects"), total);
 718                 }
 719                 for (p = packed_git; p; p = p->next) {
 720                         /* verify gives error messages itself */
 721                         if (verify_pack(p, fsck_obj_buffer,
 722                                         progress, count))
 723                                 errors_found |= ERROR_PACK;
 724                         count += p->num_objects;
 725                 }
 726                 stop_progress(&progress);
 727         }
 728
 729         heads = 0;
 730         for (i = 0; i < argc; i++) {
 731                 const char *arg = argv[i];
 732                 unsigned char sha1[20];
 733                 if (!get_sha1(arg, sha1)) {
 734                         struct object *obj = lookup_object(sha1);
 735
 736                         /* Error is printed by lookup_object(). */
 737                         if (!obj)
 738                                 continue;
 739
 740                         obj->used = 1;
 741                         mark_object_reachable(obj);
 742                         heads++;
 743                         continue;
 744                 }
 745                 error("invalid parameter: expected sha1, got '%s'", arg);
 746         }
 747
 748         /*
 749          * If we've not been given any explicit head information, do the
 750          * default ones from .git/refs. We also consider the index file
 751          * in this case (ie this implies --cache).
 752          */
 753         if (!heads) {
 754                 get_default_heads();
 755                 keep_cache_objects = 1;
 756         }
 757
 758         if (keep_cache_objects) {
 759                 read_cache();
 760                 for (i = 0; i < active_nr; i++) {
 761                         unsigned int mode;
 762                         struct blob *blob;
 763                         struct object *obj;
 764
 765                         mode = active_cache[i]->ce_mode;
 766                         if (S_ISGITLINK(mode))
 767                                 continue;
 768                         blob = lookup_blob(active_cache[i]->sha1);
 769                         if (!blob)
 770                                 continue;
 771                         obj = &blob->object;
 772                         obj->used = 1;
 773                         mark_object_reachable(obj);
 774                 }
 775                 if (active_cache_tree)
 776                         fsck_cache_tree(active_cache_tree);
 777         }
 778
 779         check_connectivity();
 780         return errors_found;
 781 }