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

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "repository.h"
   4 #include "config.h"
   5 #include "commit.h"
   6 #include "tree.h"
   7 #include "blob.h"
   8 #include "tag.h"
   9 #include "refs.h"
  10 #include "pack.h"
  11 #include "cache-tree.h"
  12 #include "tree-walk.h"
  13 #include "fsck.h"
  14 #include "parse-options.h"
  15 #include "dir.h"
  16 #include "progress.h"
  17 #include "streaming.h"
  18 #include "decorate.h"
  19 #include "packfile.h"
  20 #include "object-store.h"
  21 #include "run-command.h"
  22 #include "worktree.h"
  23
  24 #define REACHABLE 0x0001
  25 #define SEEN      0x0002
  26 #define HAS_OBJ   0x0004
  27 /* This flag is set if something points to this object. */
  28 #define USED      0x0008
  29
  30 static int show_root;
  31 static int show_tags;
  32 static int show_unreachable;
  33 static int include_reflogs = 1;
  34 static int check_full = 1;
  35 static int connectivity_only;
  36 static int check_strict;
  37 static int keep_cache_objects;
  38 static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
  39 static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
  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 #define ERROR_COMMIT_GRAPH 020
  51
  52 static const char *describe_object(struct object *obj)
  53 {
  54         static struct strbuf buf = STRBUF_INIT;
  55         char *name = name_objects ?
  56                 lookup_decoration(fsck_walk_options.object_names, obj) : NULL;
  57
  58         strbuf_reset(&buf);
  59         strbuf_addstr(&buf, oid_to_hex(&obj->oid));
  60         if (name)
  61                 strbuf_addf(&buf, " (%s)", name);
  62
  63         return buf.buf;
  64 }
  65
  66 static const char *printable_type(struct object *obj)
  67 {
  68         const char *ret;
  69
  70         if (obj->type == OBJ_NONE) {
  71                 enum object_type type = oid_object_info(the_repository,
  72                                                         &obj->oid, NULL);
  73                 if (type > 0)
  74                         object_as_type(the_repository, obj, type, 0);
  75         }
  76
  77         ret = type_name(obj->type);
  78         if (!ret)
  79                 ret = "unknown";
  80
  81         return ret;
  82 }
  83
  84 static int fsck_config(const char *var, const char *value, void *cb)
  85 {
  86         if (strcmp(var, "fsck.skiplist") == 0) {
  87                 const char *path;
  88                 struct strbuf sb = STRBUF_INIT;
  89
  90                 if (git_config_pathname(&path, var, value))
  91                         return 1;
  92                 strbuf_addf(&sb, "skiplist=%s", path);
  93                 free((char *)path);
  94                 fsck_set_msg_types(&fsck_obj_options, sb.buf);
  95                 strbuf_release(&sb);
  96                 return 0;
  97         }
  98
  99         if (skip_prefix(var, "fsck.", &var)) {
 100                 fsck_set_msg_type(&fsck_obj_options, var, value);
 101                 return 0;
 102         }
 103
 104         return git_default_config(var, value, cb);
 105 }
 106
 107 static void objreport(struct object *obj, const char *msg_type,
 108                         const char *err)
 109 {
 110         fprintf(stderr, "%s in %s %s: %s\n",
 111                 msg_type, printable_type(obj), describe_object(obj), err);
 112 }
 113
 114 static int objerror(struct object *obj, const char *err)
 115 {
 116         errors_found |= ERROR_OBJECT;
 117         objreport(obj, "error", err);
 118         return -1;
 119 }
 120
 121 static int fsck_error_func(struct fsck_options *o,
 122         struct object *obj, int type, const char *message)
 123 {
 124         objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message);
 125         return (type == FSCK_WARN) ? 0 : 1;
 126 }
 127
 128 static struct object_array pending;
 129
 130 static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
 131 {
 132         struct object *parent = data;
 133
 134         /*
 135          * The only case data is NULL or type is OBJ_ANY is when
 136          * mark_object_reachable() calls us.  All the callers of
 137          * that function has non-NULL obj hence ...
 138          */
 139         if (!obj) {
 140                 /* ... these references to parent->fld are safe here */
 141                 printf("broken link from %7s %s\n",
 142                            printable_type(parent), describe_object(parent));
 143                 printf("broken link from %7s %s\n",
 144                            (type == OBJ_ANY ? "unknown" : type_name(type)), "unknown");
 145                 errors_found |= ERROR_REACHABLE;
 146                 return 1;
 147         }
 148
 149         if (type != OBJ_ANY && obj->type != type)
 150                 /* ... and the reference to parent is safe here */
 151                 objerror(parent, "wrong object type in link");
 152
 153         if (obj->flags & REACHABLE)
 154                 return 0;
 155         obj->flags |= REACHABLE;
 156
 157         if (is_promisor_object(&obj->oid))
 158                 /*
 159                  * Further recursion does not need to be performed on this
 160                  * object since it is a promisor object (so it does not need to
 161                  * be added to "pending").
 162                  */
 163                 return 0;
 164
 165         if (!(obj->flags & HAS_OBJ)) {
 166                 if (parent && !has_object_file(&obj->oid)) {
 167                         printf("broken link from %7s %s\n",
 168                                  printable_type(parent), describe_object(parent));
 169                         printf("              to %7s %s\n",
 170                                  printable_type(obj), describe_object(obj));
 171                         errors_found |= ERROR_REACHABLE;
 172                 }
 173                 return 1;
 174         }
 175
 176         add_object_array(obj, NULL, &pending);
 177         return 0;
 178 }
 179
 180 static void mark_object_reachable(struct object *obj)
 181 {
 182         mark_object(obj, OBJ_ANY, NULL, NULL);
 183 }
 184
 185 static int traverse_one_object(struct object *obj)
 186 {
 187         int result = fsck_walk(obj, obj, &fsck_walk_options);
 188
 189         if (obj->type == OBJ_TREE) {
 190                 struct tree *tree = (struct tree *)obj;
 191                 free_tree_buffer(tree);
 192         }
 193         return result;
 194 }
 195
 196 static int traverse_reachable(void)
 197 {
 198         struct progress *progress = NULL;
 199         unsigned int nr = 0;
 200         int result = 0;
 201         if (show_progress)
 202                 progress = start_delayed_progress(_("Checking connectivity"), 0);
 203         while (pending.nr) {
 204                 result |= traverse_one_object(object_array_pop(&pending));
 205                 display_progress(progress, ++nr);
 206         }
 207         stop_progress(&progress);
 208         return !!result;
 209 }
 210
 211 static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
 212 {
 213         if (!obj)
 214                 return 1;
 215         obj->flags |= USED;
 216         return 0;
 217 }
 218
 219 /*
 220  * Check a single reachable object
 221  */
 222 static void check_reachable_object(struct object *obj)
 223 {
 224         /*
 225          * We obviously want the object to be parsed,
 226          * except if it was in a pack-file and we didn't
 227          * do a full fsck
 228          */
 229         if (!(obj->flags & HAS_OBJ)) {
 230                 if (is_promisor_object(&obj->oid))
 231                         return;
 232                 if (has_object_pack(&obj->oid))
 233                         return; /* it is in pack - forget about it */
 234                 printf("missing %s %s\n", printable_type(obj),
 235                         describe_object(obj));
 236                 errors_found |= ERROR_REACHABLE;
 237                 return;
 238         }
 239 }
 240
 241 /*
 242  * Check a single unreachable object
 243  */
 244 static void check_unreachable_object(struct object *obj)
 245 {
 246         /*
 247          * Missing unreachable object? Ignore it. It's not like
 248          * we miss it (since it can't be reached), nor do we want
 249          * to complain about it being unreachable (since it does
 250          * not exist).
 251          */
 252         if (!(obj->flags & HAS_OBJ))
 253                 return;
 254
 255         /*
 256          * Unreachable object that exists? Show it if asked to,
 257          * since this is something that is prunable.
 258          */
 259         if (show_unreachable) {
 260                 printf("unreachable %s %s\n", printable_type(obj),
 261                         describe_object(obj));
 262                 return;
 263         }
 264
 265         /*
 266          * "!USED" means that nothing at all points to it, including
 267          * other unreachable objects. In other words, it's the "tip"
 268          * of some set of unreachable objects, usually a commit that
 269          * got dropped.
 270          *
 271          * Such starting points are more interesting than some random
 272          * set of unreachable objects, so we show them even if the user
 273          * hasn't asked for _all_ unreachable objects. If you have
 274          * deleted a branch by mistake, this is a prime candidate to
 275          * start looking at, for example.
 276          */
 277         if (!(obj->flags & USED)) {
 278                 if (show_dangling)
 279                         printf("dangling %s %s\n", printable_type(obj),
 280                                describe_object(obj));
 281                 if (write_lost_and_found) {
 282                         char *filename = git_pathdup("lost-found/%s/%s",
 283                                 obj->type == OBJ_COMMIT ? "commit" : "other",
 284                                 describe_object(obj));
 285                         FILE *f;
 286
 287                         if (safe_create_leading_directories_const(filename)) {
 288                                 error("Could not create lost-found");
 289                                 free(filename);
 290                                 return;
 291                         }
 292                         f = xfopen(filename, "w");
 293                         if (obj->type == OBJ_BLOB) {
 294                                 if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
 295                                         die_errno("Could not write '%s'", filename);
 296                         } else
 297                                 fprintf(f, "%s\n", describe_object(obj));
 298                         if (fclose(f))
 299                                 die_errno("Could not finish '%s'",
 300                                           filename);
 301                         free(filename);
 302                 }
 303                 return;
 304         }
 305
 306         /*
 307          * Otherwise? It's there, it's unreachable, and some other unreachable
 308          * object points to it. Ignore it - it's not interesting, and we showed
 309          * all the interesting cases above.
 310          */
 311 }
 312
 313 static void check_object(struct object *obj)
 314 {
 315         if (verbose)
 316                 fprintf(stderr, "Checking %s\n", describe_object(obj));
 317
 318         if (obj->flags & REACHABLE)
 319                 check_reachable_object(obj);
 320         else
 321                 check_unreachable_object(obj);
 322 }
 323
 324 static void check_connectivity(void)
 325 {
 326         int i, max;
 327
 328         /* Traverse the pending reachable objects */
 329         traverse_reachable();
 330
 331         /* Look up all the requirements, warn about missing objects.. */
 332         max = get_max_object_index();
 333         if (verbose)
 334                 fprintf(stderr, "Checking connectivity (%d objects)\n", max);
 335
 336         for (i = 0; i < max; i++) {
 337                 struct object *obj = get_indexed_object(i);
 338
 339                 if (obj)
 340                         check_object(obj);
 341         }
 342 }
 343
 344 static int fsck_obj(struct object *obj, void *buffer, unsigned long size)
 345 {
 346         int err;
 347
 348         if (obj->flags & SEEN)
 349                 return 0;
 350         obj->flags |= SEEN;
 351
 352         if (verbose)
 353                 fprintf(stderr, "Checking %s %s\n",
 354                         printable_type(obj), describe_object(obj));
 355
 356         if (fsck_walk(obj, NULL, &fsck_obj_options))
 357                 objerror(obj, "broken links");
 358         err = fsck_object(obj, buffer, size, &fsck_obj_options);
 359         if (err)
 360                 goto out;
 361
 362         if (obj->type == OBJ_COMMIT) {
 363                 struct commit *commit = (struct commit *) obj;
 364
 365                 if (!commit->parents && show_root)
 366                         printf("root %s\n", describe_object(&commit->object));
 367         }
 368
 369         if (obj->type == OBJ_TAG) {
 370                 struct tag *tag = (struct tag *) obj;
 371
 372                 if (show_tags && tag->tagged) {
 373                         printf("tagged %s %s", printable_type(tag->tagged),
 374                                 describe_object(tag->tagged));
 375                         printf(" (%s) in %s\n", tag->tag,
 376                                 describe_object(&tag->object));
 377                 }
 378         }
 379
 380 out:
 381         if (obj->type == OBJ_TREE)
 382                 free_tree_buffer((struct tree *)obj);
 383         if (obj->type == OBJ_COMMIT)
 384                 free_commit_buffer(the_repository->parsed_objects,
 385                                    (struct commit *)obj);
 386         return err;
 387 }
 388
 389 static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
 390                            unsigned long size, void *buffer, int *eaten)
 391 {
 392         /*
 393          * Note, buffer may be NULL if type is OBJ_BLOB. See
 394          * verify_packfile(), data_valid variable for details.
 395          */
 396         struct object *obj;
 397         obj = parse_object_buffer(the_repository, oid, type, size, buffer,
 398                                   eaten);
 399         if (!obj) {
 400                 errors_found |= ERROR_OBJECT;
 401                 return error("%s: object corrupt or missing", oid_to_hex(oid));
 402         }
 403         obj->flags &= ~(REACHABLE | SEEN);
 404         obj->flags |= HAS_OBJ;
 405         return fsck_obj(obj, buffer, size);
 406 }
 407
 408 static int default_refs;
 409
 410 static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
 411         timestamp_t timestamp)
 412 {
 413         struct object *obj;
 414
 415         if (!is_null_oid(oid)) {
 416                 obj = lookup_object(the_repository, oid->hash);
 417                 if (obj && (obj->flags & HAS_OBJ)) {
 418                         if (timestamp && name_objects)
 419                                 add_decoration(fsck_walk_options.object_names,
 420                                         obj,
 421                                         xstrfmt("%s@{%"PRItime"}", refname, timestamp));
 422                         obj->flags |= USED;
 423                         mark_object_reachable(obj);
 424                 } else if (!is_promisor_object(oid)) {
 425                         error("%s: invalid reflog entry %s", refname, oid_to_hex(oid));
 426                         errors_found |= ERROR_REACHABLE;
 427                 }
 428         }
 429 }
 430
 431 static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid,
 432                 const char *email, timestamp_t timestamp, int tz,
 433                 const char *message, void *cb_data)
 434 {
 435         const char *refname = cb_data;
 436
 437         if (verbose)
 438                 fprintf(stderr, "Checking reflog %s->%s\n",
 439                         oid_to_hex(ooid), oid_to_hex(noid));
 440
 441         fsck_handle_reflog_oid(refname, ooid, 0);
 442         fsck_handle_reflog_oid(refname, noid, timestamp);
 443         return 0;
 444 }
 445
 446 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
 447                               int flag, void *cb_data)
 448 {
 449         struct strbuf refname = STRBUF_INIT;
 450
 451         strbuf_worktree_ref(cb_data, &refname, logname);
 452         for_each_reflog_ent(refname.buf, fsck_handle_reflog_ent, refname.buf);
 453         strbuf_release(&refname);
 454         return 0;
 455 }
 456
 457 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 458                            int flag, void *cb_data)
 459 {
 460         struct object *obj;
 461
 462         obj = parse_object(the_repository, oid);
 463         if (!obj) {
 464                 if (is_promisor_object(oid)) {
 465                         /*
 466                          * Increment default_refs anyway, because this is a
 467                          * valid ref.
 468                          */
 469                          default_refs++;
 470                          return 0;
 471                 }
 472                 error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
 473                 errors_found |= ERROR_REACHABLE;
 474                 /* We'll continue with the rest despite the error.. */
 475                 return 0;
 476         }
 477         if (obj->type != OBJ_COMMIT && is_branch(refname)) {
 478                 error("%s: not a commit", refname);
 479                 errors_found |= ERROR_REFS;
 480         }
 481         default_refs++;
 482         obj->flags |= USED;
 483         if (name_objects)
 484                 add_decoration(fsck_walk_options.object_names,
 485                         obj, xstrdup(refname));
 486         mark_object_reachable(obj);
 487
 488         return 0;
 489 }
 490
 491 static int fsck_head_link(const char *head_ref_name,
 492                           const char **head_points_at,
 493                           struct object_id *head_oid);
 494
 495 static void get_default_heads(void)
 496 {
 497         struct worktree **worktrees, **p;
 498         const char *head_points_at;
 499         struct object_id head_oid;
 500
 501         for_each_rawref(fsck_handle_ref, NULL);
 502
 503         worktrees = get_worktrees(0);
 504         for (p = worktrees; *p; p++) {
 505                 struct worktree *wt = *p;
 506                 struct strbuf ref = STRBUF_INIT;
 507
 508                 strbuf_worktree_ref(wt, &ref, "HEAD");
 509                 fsck_head_link(ref.buf, &head_points_at, &head_oid);
 510                 if (head_points_at && !is_null_oid(&head_oid))
 511                         fsck_handle_ref(ref.buf, &head_oid, 0, NULL);
 512                 strbuf_release(&ref);
 513
 514                 if (include_reflogs)
 515                         refs_for_each_reflog(get_worktree_ref_store(wt),
 516                                              fsck_handle_reflog, wt);
 517         }
 518         free_worktrees(worktrees);
 519
 520         /*
 521          * Not having any default heads isn't really fatal, but
 522          * it does mean that "--unreachable" no longer makes any
 523          * sense (since in this case everything will obviously
 524          * be unreachable by definition.
 525          *
 526          * Showing dangling objects is valid, though (as those
 527          * dangling objects are likely lost heads).
 528          *
 529          * So we just print a warning about it, and clear the
 530          * "show_unreachable" flag.
 531          */
 532         if (!default_refs) {
 533                 fprintf(stderr, "notice: No default references\n");
 534                 show_unreachable = 0;
 535         }
 536 }
 537
 538 static int fsck_loose(const struct object_id *oid, const char *path, void *data)
 539 {
 540         struct object *obj;
 541         enum object_type type;
 542         unsigned long size;
 543         void *contents;
 544         int eaten;
 545
 546         if (read_loose_object(path, oid, &type, &size, &contents) < 0) {
 547                 errors_found |= ERROR_OBJECT;
 548                 error("%s: object corrupt or missing: %s",
 549                       oid_to_hex(oid), path);
 550                 return 0; /* keep checking other objects */
 551         }
 552
 553         if (!contents && type != OBJ_BLOB)
 554                 BUG("read_loose_object streamed a non-blob");
 555
 556         obj = parse_object_buffer(the_repository, oid, type, size,
 557                                   contents, &eaten);
 558
 559         if (!obj) {
 560                 errors_found |= ERROR_OBJECT;
 561                 error("%s: object could not be parsed: %s",
 562                       oid_to_hex(oid), path);
 563                 if (!eaten)
 564                         free(contents);
 565                 return 0; /* keep checking other objects */
 566         }
 567
 568         obj->flags &= ~(REACHABLE | SEEN);
 569         obj->flags |= HAS_OBJ;
 570         if (fsck_obj(obj, contents, size))
 571                 errors_found |= ERROR_OBJECT;
 572
 573         if (!eaten)
 574                 free(contents);
 575         return 0; /* keep checking other objects, even if we saw an error */
 576 }
 577
 578 static int fsck_cruft(const char *basename, const char *path, void *data)
 579 {
 580         if (!starts_with(basename, "tmp_obj_"))
 581                 fprintf(stderr, "bad sha1 file: %s\n", path);
 582         return 0;
 583 }
 584
 585 static int fsck_subdir(unsigned int nr, const char *path, void *progress)
 586 {
 587         display_progress(progress, nr + 1);
 588         return 0;
 589 }
 590
 591 static void fsck_object_dir(const char *path)
 592 {
 593         struct progress *progress = NULL;
 594
 595         if (verbose)
 596                 fprintf(stderr, "Checking object directory\n");
 597
 598         if (show_progress)
 599                 progress = start_progress(_("Checking object directories"), 256);
 600
 601         for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
 602                                       progress);
 603         display_progress(progress, 256);
 604         stop_progress(&progress);
 605 }
 606
 607 static int fsck_head_link(const char *head_ref_name,
 608                           const char **head_points_at,
 609                           struct object_id *head_oid)
 610 {
 611         int null_is_error = 0;
 612
 613         if (verbose)
 614                 fprintf(stderr, "Checking %s link\n", head_ref_name);
 615
 616         *head_points_at = resolve_ref_unsafe(head_ref_name, 0, head_oid, NULL);
 617         if (!*head_points_at) {
 618                 errors_found |= ERROR_REFS;
 619                 return error("Invalid %s", head_ref_name);
 620         }
 621         if (!strcmp(*head_points_at, head_ref_name))
 622                 /* detached HEAD */
 623                 null_is_error = 1;
 624         else if (!starts_with(*head_points_at, "refs/heads/")) {
 625                 errors_found |= ERROR_REFS;
 626                 return error("%s points to something strange (%s)",
 627                              head_ref_name, *head_points_at);
 628         }
 629         if (is_null_oid(head_oid)) {
 630                 if (null_is_error) {
 631                         errors_found |= ERROR_REFS;
 632                         return error("%s: detached HEAD points at nothing",
 633                                      head_ref_name);
 634                 }
 635                 fprintf(stderr, "notice: %s points to an unborn branch (%s)\n",
 636                         head_ref_name, *head_points_at + 11);
 637         }
 638         return 0;
 639 }
 640
 641 static int fsck_cache_tree(struct cache_tree *it)
 642 {
 643         int i;
 644         int err = 0;
 645
 646         if (verbose)
 647                 fprintf(stderr, "Checking cache tree\n");
 648
 649         if (0 <= it->entry_count) {
 650                 struct object *obj = parse_object(the_repository, &it->oid);
 651                 if (!obj) {
 652                         error("%s: invalid sha1 pointer in cache-tree",
 653                               oid_to_hex(&it->oid));
 654                         errors_found |= ERROR_REFS;
 655                         return 1;
 656                 }
 657                 obj->flags |= USED;
 658                 if (name_objects)
 659                         add_decoration(fsck_walk_options.object_names,
 660                                 obj, xstrdup(":"));
 661                 mark_object_reachable(obj);
 662                 if (obj->type != OBJ_TREE)
 663                         err |= objerror(obj, "non-tree in cache-tree");
 664         }
 665         for (i = 0; i < it->subtree_nr; i++)
 666                 err |= fsck_cache_tree(it->down[i]->cache_tree);
 667         return err;
 668 }
 669
 670 static void mark_object_for_connectivity(const struct object_id *oid)
 671 {
 672         struct object *obj = lookup_unknown_object(oid->hash);
 673         obj->flags |= HAS_OBJ;
 674 }
 675
 676 static int mark_loose_for_connectivity(const struct object_id *oid,
 677                                        const char *path,
 678                                        void *data)
 679 {
 680         mark_object_for_connectivity(oid);
 681         return 0;
 682 }
 683
 684 static int mark_packed_for_connectivity(const struct object_id *oid,
 685                                         struct packed_git *pack,
 686                                         uint32_t pos,
 687                                         void *data)
 688 {
 689         mark_object_for_connectivity(oid);
 690         return 0;
 691 }
 692
 693 static char const * const fsck_usage[] = {
 694         N_("git fsck [<options>] [<object>...]"),
 695         NULL
 696 };
 697
 698 static struct option fsck_opts[] = {
 699         OPT__VERBOSE(&verbose, N_("be verbose")),
 700         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
 701         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
 702         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
 703         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
 704         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
 705         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
 706         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
 707         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
 708         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
 709         OPT_BOOL(0, "lost-found", &write_lost_and_found,
 710                                 N_("write dangling objects in .git/lost-found")),
 711         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 712         OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
 713         OPT_END(),
 714 };
 715
 716 int cmd_fsck(int argc, const char **argv, const char *prefix)
 717 {
 718         int i;
 719         struct alternate_object_database *alt;
 720
 721         /* fsck knows how to handle missing promisor objects */
 722         fetch_if_missing = 0;
 723
 724         errors_found = 0;
 725         read_replace_refs = 0;
 726
 727         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 728
 729         fsck_walk_options.walk = mark_object;
 730         fsck_obj_options.walk = mark_used;
 731         fsck_obj_options.error_func = fsck_error_func;
 732         if (check_strict)
 733                 fsck_obj_options.strict = 1;
 734
 735         if (show_progress == -1)
 736                 show_progress = isatty(2);
 737         if (verbose)
 738                 show_progress = 0;
 739
 740         if (write_lost_and_found) {
 741                 check_full = 1;
 742                 include_reflogs = 0;
 743         }
 744
 745         if (name_objects)
 746                 fsck_walk_options.object_names =
 747                         xcalloc(1, sizeof(struct decoration));
 748
 749         git_config(fsck_config, NULL);
 750
 751         if (connectivity_only) {
 752                 for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
 753                 for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
 754         } else {
 755                 struct alternate_object_database *alt_odb_list;
 756
 757                 fsck_object_dir(get_object_directory());
 758
 759                 prepare_alt_odb(the_repository);
 760                 alt_odb_list = the_repository->objects->alt_odb_list;
 761                 for (alt = alt_odb_list; alt; alt = alt->next)
 762                         fsck_object_dir(alt->path);
 763
 764                 if (check_full) {
 765                         struct packed_git *p;
 766                         uint32_t total = 0, count = 0;
 767                         struct progress *progress = NULL;
 768
 769                         if (show_progress) {
 770                                 for (p = get_all_packs(the_repository); p;
 771                                      p = p->next) {
 772                                         if (open_pack_index(p))
 773                                                 continue;
 774                                         total += p->num_objects;
 775                                 }
 776
 777                                 progress = start_progress(_("Checking objects"), total);
 778                         }
 779                         for (p = get_all_packs(the_repository); p;
 780                              p = p->next) {
 781                                 /* verify gives error messages itself */
 782                                 if (verify_pack(the_repository,
 783                                                 p, fsck_obj_buffer,
 784                                                 progress, count))
 785                                         errors_found |= ERROR_PACK;
 786                                 count += p->num_objects;
 787                         }
 788                         stop_progress(&progress);
 789                 }
 790
 791                 if (fsck_finish(&fsck_obj_options))
 792                         errors_found |= ERROR_OBJECT;
 793         }
 794
 795         for (i = 0; i < argc; i++) {
 796                 const char *arg = argv[i];
 797                 struct object_id oid;
 798                 if (!get_oid(arg, &oid)) {
 799                         struct object *obj = lookup_object(the_repository,
 800                                                            oid.hash);
 801
 802                         if (!obj || !(obj->flags & HAS_OBJ)) {
 803                                 if (is_promisor_object(&oid))
 804                                         continue;
 805                                 error("%s: object missing", oid_to_hex(&oid));
 806                                 errors_found |= ERROR_OBJECT;
 807                                 continue;
 808                         }
 809
 810                         obj->flags |= USED;
 811                         if (name_objects)
 812                                 add_decoration(fsck_walk_options.object_names,
 813                                         obj, xstrdup(arg));
 814                         mark_object_reachable(obj);
 815                         continue;
 816                 }
 817                 error("invalid parameter: expected sha1, got '%s'", arg);
 818                 errors_found |= ERROR_OBJECT;
 819         }
 820
 821         /*
 822          * If we've not been given any explicit head information, do the
 823          * default ones from .git/refs. We also consider the index file
 824          * in this case (ie this implies --cache).
 825          */
 826         if (!argc) {
 827                 get_default_heads();
 828                 keep_cache_objects = 1;
 829         }
 830
 831         if (keep_cache_objects) {
 832                 verify_index_checksum = 1;
 833                 verify_ce_order = 1;
 834                 read_cache();
 835                 for (i = 0; i < active_nr; i++) {
 836                         unsigned int mode;
 837                         struct blob *blob;
 838                         struct object *obj;
 839
 840                         mode = active_cache[i]->ce_mode;
 841                         if (S_ISGITLINK(mode))
 842                                 continue;
 843                         blob = lookup_blob(the_repository,
 844                                            &active_cache[i]->oid);
 845                         if (!blob)
 846                                 continue;
 847                         obj = &blob->object;
 848                         obj->flags |= USED;
 849                         if (name_objects)
 850                                 add_decoration(fsck_walk_options.object_names,
 851                                         obj,
 852                                         xstrfmt(":%s", active_cache[i]->name));
 853                         mark_object_reachable(obj);
 854                 }
 855                 if (active_cache_tree)
 856                         fsck_cache_tree(active_cache_tree);
 857         }
 858
 859         check_connectivity();
 860
 861         if (!git_config_get_bool("core.commitgraph", &i) && i) {
 862                 struct child_process commit_graph_verify = CHILD_PROCESS_INIT;
 863                 const char *verify_argv[] = { "commit-graph", "verify", NULL, NULL, NULL };
 864
 865                 commit_graph_verify.argv = verify_argv;
 866                 commit_graph_verify.git_cmd = 1;
 867                 if (run_command(&commit_graph_verify))
 868                         errors_found |= ERROR_COMMIT_GRAPH;
 869
 870                 prepare_alt_odb(the_repository);
 871                 for (alt =  the_repository->objects->alt_odb_list; alt; alt = alt->next) {
 872                         verify_argv[2] = "--object-dir";
 873                         verify_argv[3] = alt->path;
 874                         if (run_command(&commit_graph_verify))
 875                                 errors_found |= ERROR_COMMIT_GRAPH;
 876                 }
 877         }
 878
 879         if (!git_config_get_bool("core.multipackindex", &i) && i) {
 880                 struct child_process midx_verify = CHILD_PROCESS_INIT;
 881                 const char *midx_argv[] = { "multi-pack-index", "verify", NULL, NULL, NULL };
 882
 883                 midx_verify.argv = midx_argv;
 884                 midx_verify.git_cmd = 1;
 885                 if (run_command(&midx_verify))
 886                         errors_found |= ERROR_COMMIT_GRAPH;
 887
 888                 prepare_alt_odb(the_repository);
 889                 for (alt =  the_repository->objects->alt_odb_list; alt; alt = alt->next) {
 890                         midx_argv[2] = "--object-dir";
 891                         midx_argv[3] = alt->path;
 892                         if (run_command(&midx_verify))
 893                                 errors_found |= ERROR_COMMIT_GRAPH;
 894                 }
 895         }
 896
 897         return errors_found;
 898 }