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 bufs[] = {
  55                 STRBUF_INIT, STRBUF_INIT, STRBUF_INIT, STRBUF_INIT
  56         };
  57         static int b = 0;
  58         struct strbuf *buf;
  59         char *name = NULL;
  60
  61         if (name_objects)
  62                 name = lookup_decoration(fsck_walk_options.object_names, obj);
  63
  64         buf = bufs + b;
  65         b = (b + 1) % ARRAY_SIZE(bufs);
  66         strbuf_reset(buf);
  67         strbuf_addstr(buf, oid_to_hex(&obj->oid));
  68         if (name)
  69                 strbuf_addf(buf, " (%s)", name);
  70
  71         return buf->buf;
  72 }
  73
  74 static const char *printable_type(struct object *obj)
  75 {
  76         const char *ret;
  77
  78         if (obj->type == OBJ_NONE) {
  79                 enum object_type type = oid_object_info(the_repository,
  80                                                         &obj->oid, NULL);
  81                 if (type > 0)
  82                         object_as_type(the_repository, obj, type, 0);
  83         }
  84
  85         ret = type_name(obj->type);
  86         if (!ret)
  87                 ret = _("unknown");
  88
  89         return ret;
  90 }
  91
  92 static int fsck_config(const char *var, const char *value, void *cb)
  93 {
  94         if (strcmp(var, "fsck.skiplist") == 0) {
  95                 const char *path;
  96                 struct strbuf sb = STRBUF_INIT;
  97
  98                 if (git_config_pathname(&path, var, value))
  99                         return 1;
 100                 strbuf_addf(&sb, "skiplist=%s", path);
 101                 free((char *)path);
 102                 fsck_set_msg_types(&fsck_obj_options, sb.buf);
 103                 strbuf_release(&sb);
 104                 return 0;
 105         }
 106
 107         if (skip_prefix(var, "fsck.", &var)) {
 108                 fsck_set_msg_type(&fsck_obj_options, var, value);
 109                 return 0;
 110         }
 111
 112         return git_default_config(var, value, cb);
 113 }
 114
 115 static int objerror(struct object *obj, const char *err)
 116 {
 117         errors_found |= ERROR_OBJECT;
 118         /* TRANSLATORS: e.g. error in tree 01bfda: <more explanation> */
 119         fprintf_ln(stderr, _("error in %s %s: %s"),
 120                    printable_type(obj), describe_object(obj), err);
 121         return -1;
 122 }
 123
 124 static int fsck_error_func(struct fsck_options *o,
 125         struct object *obj, int type, const char *message)
 126 {
 127         switch (type) {
 128         case FSCK_WARN:
 129                 /* TRANSLATORS: e.g. warning in tree 01bfda: <more explanation> */
 130                 fprintf_ln(stderr, _("warning in %s %s: %s"),
 131                            printable_type(obj), describe_object(obj), message);
 132                 return 0;
 133         case FSCK_ERROR:
 134                 /* TRANSLATORS: e.g. error in tree 01bfda: <more explanation> */
 135                 fprintf_ln(stderr, _("error in %s %s: %s"),
 136                            printable_type(obj), describe_object(obj), message);
 137                 return 1;
 138         default:
 139                 BUG("%d (FSCK_IGNORE?) should never trigger this callback", type);
 140         }
 141 }
 142
 143 static struct object_array pending;
 144
 145 static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
 146 {
 147         struct object *parent = data;
 148
 149         /*
 150          * The only case data is NULL or type is OBJ_ANY is when
 151          * mark_object_reachable() calls us.  All the callers of
 152          * that function has non-NULL obj hence ...
 153          */
 154         if (!obj) {
 155                 /* ... these references to parent->fld are safe here */
 156                 printf_ln(_("broken link from %7s %s"),
 157                           printable_type(parent), describe_object(parent));
 158                 printf_ln(_("broken link from %7s %s"),
 159                           (type == OBJ_ANY ? _("unknown") : type_name(type)),
 160                           _("unknown"));
 161                 errors_found |= ERROR_REACHABLE;
 162                 return 1;
 163         }
 164
 165         if (type != OBJ_ANY && obj->type != type)
 166                 /* ... and the reference to parent is safe here */
 167                 objerror(parent, _("wrong object type in link"));
 168
 169         if (obj->flags & REACHABLE)
 170                 return 0;
 171         obj->flags |= REACHABLE;
 172
 173         if (is_promisor_object(&obj->oid))
 174                 /*
 175                  * Further recursion does not need to be performed on this
 176                  * object since it is a promisor object (so it does not need to
 177                  * be added to "pending").
 178                  */
 179                 return 0;
 180
 181         if (!(obj->flags & HAS_OBJ)) {
 182                 if (parent && !has_object_file(&obj->oid)) {
 183                         printf_ln(_("broken link from %7s %s\n"
 184                                     "              to %7s %s"),
 185                                   printable_type(parent),
 186                                   describe_object(parent),
 187                                   printable_type(obj),
 188                                   describe_object(obj));
 189                         errors_found |= ERROR_REACHABLE;
 190                 }
 191                 return 1;
 192         }
 193
 194         add_object_array(obj, NULL, &pending);
 195         return 0;
 196 }
 197
 198 static void mark_object_reachable(struct object *obj)
 199 {
 200         mark_object(obj, OBJ_ANY, NULL, NULL);
 201 }
 202
 203 static int traverse_one_object(struct object *obj)
 204 {
 205         int result = fsck_walk(obj, obj, &fsck_walk_options);
 206
 207         if (obj->type == OBJ_TREE) {
 208                 struct tree *tree = (struct tree *)obj;
 209                 free_tree_buffer(tree);
 210         }
 211         return result;
 212 }
 213
 214 static int traverse_reachable(void)
 215 {
 216         struct progress *progress = NULL;
 217         unsigned int nr = 0;
 218         int result = 0;
 219         if (show_progress)
 220                 progress = start_delayed_progress(_("Checking connectivity"), 0);
 221         while (pending.nr) {
 222                 result |= traverse_one_object(object_array_pop(&pending));
 223                 display_progress(progress, ++nr);
 224         }
 225         stop_progress(&progress);
 226         return !!result;
 227 }
 228
 229 static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
 230 {
 231         if (!obj)
 232                 return 1;
 233         obj->flags |= USED;
 234         return 0;
 235 }
 236
 237 /*
 238  * Check a single reachable object
 239  */
 240 static void check_reachable_object(struct object *obj)
 241 {
 242         /*
 243          * We obviously want the object to be parsed,
 244          * except if it was in a pack-file and we didn't
 245          * do a full fsck
 246          */
 247         if (!(obj->flags & HAS_OBJ)) {
 248                 if (is_promisor_object(&obj->oid))
 249                         return;
 250                 if (has_object_pack(&obj->oid))
 251                         return; /* it is in pack - forget about it */
 252                 printf_ln(_("missing %s %s"), printable_type(obj),
 253                           describe_object(obj));
 254                 errors_found |= ERROR_REACHABLE;
 255                 return;
 256         }
 257 }
 258
 259 /*
 260  * Check a single unreachable object
 261  */
 262 static void check_unreachable_object(struct object *obj)
 263 {
 264         /*
 265          * Missing unreachable object? Ignore it. It's not like
 266          * we miss it (since it can't be reached), nor do we want
 267          * to complain about it being unreachable (since it does
 268          * not exist).
 269          */
 270         if (!(obj->flags & HAS_OBJ))
 271                 return;
 272
 273         /*
 274          * Unreachable object that exists? Show it if asked to,
 275          * since this is something that is prunable.
 276          */
 277         if (show_unreachable) {
 278                 printf_ln(_("unreachable %s %s"), printable_type(obj),
 279                           describe_object(obj));
 280                 return;
 281         }
 282
 283         /*
 284          * "!USED" means that nothing at all points to it, including
 285          * other unreachable objects. In other words, it's the "tip"
 286          * of some set of unreachable objects, usually a commit that
 287          * got dropped.
 288          *
 289          * Such starting points are more interesting than some random
 290          * set of unreachable objects, so we show them even if the user
 291          * hasn't asked for _all_ unreachable objects. If you have
 292          * deleted a branch by mistake, this is a prime candidate to
 293          * start looking at, for example.
 294          */
 295         if (!(obj->flags & USED)) {
 296                 if (show_dangling)
 297                         printf_ln(_("dangling %s %s"), printable_type(obj),
 298                                   describe_object(obj));
 299                 if (write_lost_and_found) {
 300                         char *filename = git_pathdup("lost-found/%s/%s",
 301                                 obj->type == OBJ_COMMIT ? "commit" : "other",
 302                                 describe_object(obj));
 303                         FILE *f;
 304
 305                         if (safe_create_leading_directories_const(filename)) {
 306                                 error(_("could not create lost-found"));
 307                                 free(filename);
 308                                 return;
 309                         }
 310                         f = xfopen(filename, "w");
 311                         if (obj->type == OBJ_BLOB) {
 312                                 if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
 313                                         die_errno(_("could not write '%s'"), filename);
 314                         } else
 315                                 fprintf(f, "%s\n", describe_object(obj));
 316                         if (fclose(f))
 317                                 die_errno(_("could not finish '%s'"),
 318                                           filename);
 319                         free(filename);
 320                 }
 321                 return;
 322         }
 323
 324         /*
 325          * Otherwise? It's there, it's unreachable, and some other unreachable
 326          * object points to it. Ignore it - it's not interesting, and we showed
 327          * all the interesting cases above.
 328          */
 329 }
 330
 331 static void check_object(struct object *obj)
 332 {
 333         if (verbose)
 334                 fprintf_ln(stderr, _("Checking %s"), describe_object(obj));
 335
 336         if (obj->flags & REACHABLE)
 337                 check_reachable_object(obj);
 338         else
 339                 check_unreachable_object(obj);
 340 }
 341
 342 static void check_connectivity(void)
 343 {
 344         int i, max;
 345
 346         /* Traverse the pending reachable objects */
 347         traverse_reachable();
 348
 349         /* Look up all the requirements, warn about missing objects.. */
 350         max = get_max_object_index();
 351         if (verbose)
 352                 fprintf_ln(stderr, _("Checking connectivity (%d objects)"), max);
 353
 354         for (i = 0; i < max; i++) {
 355                 struct object *obj = get_indexed_object(i);
 356
 357                 if (obj)
 358                         check_object(obj);
 359         }
 360 }
 361
 362 static int fsck_obj(struct object *obj, void *buffer, unsigned long size)
 363 {
 364         int err;
 365
 366         if (obj->flags & SEEN)
 367                 return 0;
 368         obj->flags |= SEEN;
 369
 370         if (verbose)
 371                 fprintf_ln(stderr, _("Checking %s %s"),
 372                            printable_type(obj), describe_object(obj));
 373
 374         if (fsck_walk(obj, NULL, &fsck_obj_options))
 375                 objerror(obj, _("broken links"));
 376         err = fsck_object(obj, buffer, size, &fsck_obj_options);
 377         if (err)
 378                 goto out;
 379
 380         if (obj->type == OBJ_COMMIT) {
 381                 struct commit *commit = (struct commit *) obj;
 382
 383                 if (!commit->parents && show_root)
 384                         printf_ln(_("root %s"),
 385                                   describe_object(&commit->object));
 386         }
 387
 388         if (obj->type == OBJ_TAG) {
 389                 struct tag *tag = (struct tag *) obj;
 390
 391                 if (show_tags && tag->tagged) {
 392                         printf_ln(_("tagged %s %s (%s) in %s"),
 393                                   printable_type(tag->tagged),
 394                                   describe_object(tag->tagged),
 395                                   tag->tag,
 396                                   describe_object(&tag->object));
 397                 }
 398         }
 399
 400 out:
 401         if (obj->type == OBJ_TREE)
 402                 free_tree_buffer((struct tree *)obj);
 403         if (obj->type == OBJ_COMMIT)
 404                 free_commit_buffer((struct commit *)obj);
 405         return err;
 406 }
 407
 408 static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
 409                            unsigned long size, void *buffer, int *eaten)
 410 {
 411         /*
 412          * Note, buffer may be NULL if type is OBJ_BLOB. See
 413          * verify_packfile(), data_valid variable for details.
 414          */
 415         struct object *obj;
 416         obj = parse_object_buffer(the_repository, oid, type, size, buffer,
 417                                   eaten);
 418         if (!obj) {
 419                 errors_found |= ERROR_OBJECT;
 420                 return error(_("%s: object corrupt or missing"),
 421                              oid_to_hex(oid));
 422         }
 423         obj->flags &= ~(REACHABLE | SEEN);
 424         obj->flags |= HAS_OBJ;
 425         return fsck_obj(obj, buffer, size);
 426 }
 427
 428 static int default_refs;
 429
 430 static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
 431         timestamp_t timestamp)
 432 {
 433         struct object *obj;
 434
 435         if (!is_null_oid(oid)) {
 436                 obj = lookup_object(the_repository, oid->hash);
 437                 if (obj && (obj->flags & HAS_OBJ)) {
 438                         if (timestamp && name_objects)
 439                                 add_decoration(fsck_walk_options.object_names,
 440                                         obj,
 441                                         xstrfmt("%s@{%"PRItime"}", refname, timestamp));
 442                         obj->flags |= USED;
 443                         mark_object_reachable(obj);
 444                 } else if (!is_promisor_object(oid)) {
 445                         error(_("%s: invalid reflog entry %s"),
 446                               refname, oid_to_hex(oid));
 447                         errors_found |= ERROR_REACHABLE;
 448                 }
 449         }
 450 }
 451
 452 static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid,
 453                 const char *email, timestamp_t timestamp, int tz,
 454                 const char *message, void *cb_data)
 455 {
 456         const char *refname = cb_data;
 457
 458         if (verbose)
 459                 fprintf_ln(stderr, _("Checking reflog %s->%s"),
 460                            oid_to_hex(ooid), oid_to_hex(noid));
 461
 462         fsck_handle_reflog_oid(refname, ooid, 0);
 463         fsck_handle_reflog_oid(refname, noid, timestamp);
 464         return 0;
 465 }
 466
 467 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
 468                               int flag, void *cb_data)
 469 {
 470         struct strbuf refname = STRBUF_INIT;
 471
 472         strbuf_worktree_ref(cb_data, &refname, logname);
 473         for_each_reflog_ent(refname.buf, fsck_handle_reflog_ent, refname.buf);
 474         strbuf_release(&refname);
 475         return 0;
 476 }
 477
 478 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 479                            int flag, void *cb_data)
 480 {
 481         struct object *obj;
 482
 483         obj = parse_object(the_repository, oid);
 484         if (!obj) {
 485                 if (is_promisor_object(oid)) {
 486                         /*
 487                          * Increment default_refs anyway, because this is a
 488                          * valid ref.
 489                          */
 490                          default_refs++;
 491                          return 0;
 492                 }
 493                 error(_("%s: invalid sha1 pointer %s"),
 494                       refname, oid_to_hex(oid));
 495                 errors_found |= ERROR_REACHABLE;
 496                 /* We'll continue with the rest despite the error.. */
 497                 return 0;
 498         }
 499         if (obj->type != OBJ_COMMIT && is_branch(refname)) {
 500                 error(_("%s: not a commit"), refname);
 501                 errors_found |= ERROR_REFS;
 502         }
 503         default_refs++;
 504         obj->flags |= USED;
 505         if (name_objects)
 506                 add_decoration(fsck_walk_options.object_names,
 507                         obj, xstrdup(refname));
 508         mark_object_reachable(obj);
 509
 510         return 0;
 511 }
 512
 513 static int fsck_head_link(const char *head_ref_name,
 514                           const char **head_points_at,
 515                           struct object_id *head_oid);
 516
 517 static void get_default_heads(void)
 518 {
 519         struct worktree **worktrees, **p;
 520         const char *head_points_at;
 521         struct object_id head_oid;
 522
 523         for_each_rawref(fsck_handle_ref, NULL);
 524
 525         worktrees = get_worktrees(0);
 526         for (p = worktrees; *p; p++) {
 527                 struct worktree *wt = *p;
 528                 struct strbuf ref = STRBUF_INIT;
 529
 530                 strbuf_worktree_ref(wt, &ref, "HEAD");
 531                 fsck_head_link(ref.buf, &head_points_at, &head_oid);
 532                 if (head_points_at && !is_null_oid(&head_oid))
 533                         fsck_handle_ref(ref.buf, &head_oid, 0, NULL);
 534                 strbuf_release(&ref);
 535
 536                 if (include_reflogs)
 537                         refs_for_each_reflog(get_worktree_ref_store(wt),
 538                                              fsck_handle_reflog, wt);
 539         }
 540         free_worktrees(worktrees);
 541
 542         /*
 543          * Not having any default heads isn't really fatal, but
 544          * it does mean that "--unreachable" no longer makes any
 545          * sense (since in this case everything will obviously
 546          * be unreachable by definition.
 547          *
 548          * Showing dangling objects is valid, though (as those
 549          * dangling objects are likely lost heads).
 550          *
 551          * So we just print a warning about it, and clear the
 552          * "show_unreachable" flag.
 553          */
 554         if (!default_refs) {
 555                 fprintf_ln(stderr, _("notice: No default references"));
 556                 show_unreachable = 0;
 557         }
 558 }
 559
 560 static int fsck_loose(const struct object_id *oid, const char *path, void *data)
 561 {
 562         struct object *obj;
 563         enum object_type type;
 564         unsigned long size;
 565         void *contents;
 566         int eaten;
 567
 568         if (read_loose_object(path, oid, &type, &size, &contents) < 0) {
 569                 errors_found |= ERROR_OBJECT;
 570                 error(_("%s: object corrupt or missing: %s"),
 571                       oid_to_hex(oid), path);
 572                 return 0; /* keep checking other objects */
 573         }
 574
 575         if (!contents && type != OBJ_BLOB)
 576                 BUG("read_loose_object streamed a non-blob");
 577
 578         obj = parse_object_buffer(the_repository, oid, type, size,
 579                                   contents, &eaten);
 580
 581         if (!obj) {
 582                 errors_found |= ERROR_OBJECT;
 583                 error(_("%s: object could not be parsed: %s"),
 584                       oid_to_hex(oid), path);
 585                 if (!eaten)
 586                         free(contents);
 587                 return 0; /* keep checking other objects */
 588         }
 589
 590         obj->flags &= ~(REACHABLE | SEEN);
 591         obj->flags |= HAS_OBJ;
 592         if (fsck_obj(obj, contents, size))
 593                 errors_found |= ERROR_OBJECT;
 594
 595         if (!eaten)
 596                 free(contents);
 597         return 0; /* keep checking other objects, even if we saw an error */
 598 }
 599
 600 static int fsck_cruft(const char *basename, const char *path, void *data)
 601 {
 602         if (!starts_with(basename, "tmp_obj_"))
 603                 fprintf_ln(stderr, _("bad sha1 file: %s"), path);
 604         return 0;
 605 }
 606
 607 static int fsck_subdir(unsigned int nr, const char *path, void *progress)
 608 {
 609         display_progress(progress, nr + 1);
 610         return 0;
 611 }
 612
 613 static void fsck_object_dir(const char *path)
 614 {
 615         struct progress *progress = NULL;
 616
 617         if (verbose)
 618                 fprintf_ln(stderr, _("Checking object directory"));
 619
 620         if (show_progress)
 621                 progress = start_progress(_("Checking object directories"), 256);
 622
 623         for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
 624                                       progress);
 625         display_progress(progress, 256);
 626         stop_progress(&progress);
 627 }
 628
 629 static int fsck_head_link(const char *head_ref_name,
 630                           const char **head_points_at,
 631                           struct object_id *head_oid)
 632 {
 633         int null_is_error = 0;
 634
 635         if (verbose)
 636                 fprintf_ln(stderr, _("Checking %s link"), head_ref_name);
 637
 638         *head_points_at = resolve_ref_unsafe(head_ref_name, 0, head_oid, NULL);
 639         if (!*head_points_at) {
 640                 errors_found |= ERROR_REFS;
 641                 return error(_("invalid %s"), head_ref_name);
 642         }
 643         if (!strcmp(*head_points_at, head_ref_name))
 644                 /* detached HEAD */
 645                 null_is_error = 1;
 646         else if (!starts_with(*head_points_at, "refs/heads/")) {
 647                 errors_found |= ERROR_REFS;
 648                 return error(_("%s points to something strange (%s)"),
 649                              head_ref_name, *head_points_at);
 650         }
 651         if (is_null_oid(head_oid)) {
 652                 if (null_is_error) {
 653                         errors_found |= ERROR_REFS;
 654                         return error(_("%s: detached HEAD points at nothing"),
 655                                      head_ref_name);
 656                 }
 657                 fprintf_ln(stderr,
 658                            _("notice: %s points to an unborn branch (%s)"),
 659                            head_ref_name, *head_points_at + 11);
 660         }
 661         return 0;
 662 }
 663
 664 static int fsck_cache_tree(struct cache_tree *it)
 665 {
 666         int i;
 667         int err = 0;
 668
 669         if (verbose)
 670                 fprintf_ln(stderr, _("Checking cache tree"));
 671
 672         if (0 <= it->entry_count) {
 673                 struct object *obj = parse_object(the_repository, &it->oid);
 674                 if (!obj) {
 675                         error(_("%s: invalid sha1 pointer in cache-tree"),
 676                               oid_to_hex(&it->oid));
 677                         errors_found |= ERROR_REFS;
 678                         return 1;
 679                 }
 680                 obj->flags |= USED;
 681                 if (name_objects)
 682                         add_decoration(fsck_walk_options.object_names,
 683                                 obj, xstrdup(":"));
 684                 mark_object_reachable(obj);
 685                 if (obj->type != OBJ_TREE)
 686                         err |= objerror(obj, _("non-tree in cache-tree"));
 687         }
 688         for (i = 0; i < it->subtree_nr; i++)
 689                 err |= fsck_cache_tree(it->down[i]->cache_tree);
 690         return err;
 691 }
 692
 693 static void mark_object_for_connectivity(const struct object_id *oid)
 694 {
 695         struct object *obj = lookup_unknown_object(oid->hash);
 696         obj->flags |= HAS_OBJ;
 697 }
 698
 699 static int mark_loose_for_connectivity(const struct object_id *oid,
 700                                        const char *path,
 701                                        void *data)
 702 {
 703         mark_object_for_connectivity(oid);
 704         return 0;
 705 }
 706
 707 static int mark_packed_for_connectivity(const struct object_id *oid,
 708                                         struct packed_git *pack,
 709                                         uint32_t pos,
 710                                         void *data)
 711 {
 712         mark_object_for_connectivity(oid);
 713         return 0;
 714 }
 715
 716 static char const * const fsck_usage[] = {
 717         N_("git fsck [<options>] [<object>...]"),
 718         NULL
 719 };
 720
 721 static struct option fsck_opts[] = {
 722         OPT__VERBOSE(&verbose, N_("be verbose")),
 723         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
 724         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
 725         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
 726         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
 727         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
 728         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
 729         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
 730         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
 731         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
 732         OPT_BOOL(0, "lost-found", &write_lost_and_found,
 733                                 N_("write dangling objects in .git/lost-found")),
 734         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 735         OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
 736         OPT_END(),
 737 };
 738
 739 int cmd_fsck(int argc, const char **argv, const char *prefix)
 740 {
 741         int i;
 742         struct alternate_object_database *alt;
 743
 744         /* fsck knows how to handle missing promisor objects */
 745         fetch_if_missing = 0;
 746
 747         errors_found = 0;
 748         read_replace_refs = 0;
 749
 750         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 751
 752         fsck_walk_options.walk = mark_object;
 753         fsck_obj_options.walk = mark_used;
 754         fsck_obj_options.error_func = fsck_error_func;
 755         if (check_strict)
 756                 fsck_obj_options.strict = 1;
 757
 758         if (show_progress == -1)
 759                 show_progress = isatty(2);
 760         if (verbose)
 761                 show_progress = 0;
 762
 763         if (write_lost_and_found) {
 764                 check_full = 1;
 765                 include_reflogs = 0;
 766         }
 767
 768         if (name_objects)
 769                 fsck_walk_options.object_names =
 770                         xcalloc(1, sizeof(struct decoration));
 771
 772         git_config(fsck_config, NULL);
 773
 774         if (connectivity_only) {
 775                 for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
 776                 for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
 777         } else {
 778                 struct alternate_object_database *alt_odb_list;
 779
 780                 fsck_object_dir(get_object_directory());
 781
 782                 prepare_alt_odb(the_repository);
 783                 alt_odb_list = the_repository->objects->alt_odb_list;
 784                 for (alt = alt_odb_list; alt; alt = alt->next)
 785                         fsck_object_dir(alt->path);
 786
 787                 if (check_full) {
 788                         struct packed_git *p;
 789                         uint32_t total = 0, count = 0;
 790                         struct progress *progress = NULL;
 791
 792                         if (show_progress) {
 793                                 for (p = get_all_packs(the_repository); p;
 794                                      p = p->next) {
 795                                         if (open_pack_index(p))
 796                                                 continue;
 797                                         total += p->num_objects;
 798                                 }
 799
 800                                 progress = start_progress(_("Checking objects"), total);
 801                         }
 802                         for (p = get_all_packs(the_repository); p;
 803                              p = p->next) {
 804                                 /* verify gives error messages itself */
 805                                 if (verify_pack(p, fsck_obj_buffer,
 806                                                 progress, count))
 807                                         errors_found |= ERROR_PACK;
 808                                 count += p->num_objects;
 809                         }
 810                         stop_progress(&progress);
 811                 }
 812
 813                 if (fsck_finish(&fsck_obj_options))
 814                         errors_found |= ERROR_OBJECT;
 815         }
 816
 817         for (i = 0; i < argc; i++) {
 818                 const char *arg = argv[i];
 819                 struct object_id oid;
 820                 if (!get_oid(arg, &oid)) {
 821                         struct object *obj = lookup_object(the_repository,
 822                                                            oid.hash);
 823
 824                         if (!obj || !(obj->flags & HAS_OBJ)) {
 825                                 if (is_promisor_object(&oid))
 826                                         continue;
 827                                 error(_("%s: object missing"), oid_to_hex(&oid));
 828                                 errors_found |= ERROR_OBJECT;
 829                                 continue;
 830                         }
 831
 832                         obj->flags |= USED;
 833                         if (name_objects)
 834                                 add_decoration(fsck_walk_options.object_names,
 835                                         obj, xstrdup(arg));
 836                         mark_object_reachable(obj);
 837                         continue;
 838                 }
 839                 error(_("invalid parameter: expected sha1, got '%s'"), arg);
 840                 errors_found |= ERROR_OBJECT;
 841         }
 842
 843         /*
 844          * If we've not been given any explicit head information, do the
 845          * default ones from .git/refs. We also consider the index file
 846          * in this case (ie this implies --cache).
 847          */
 848         if (!argc) {
 849                 get_default_heads();
 850                 keep_cache_objects = 1;
 851         }
 852
 853         if (keep_cache_objects) {
 854                 verify_index_checksum = 1;
 855                 verify_ce_order = 1;
 856                 read_cache();
 857                 for (i = 0; i < active_nr; i++) {
 858                         unsigned int mode;
 859                         struct blob *blob;
 860                         struct object *obj;
 861
 862                         mode = active_cache[i]->ce_mode;
 863                         if (S_ISGITLINK(mode))
 864                                 continue;
 865                         blob = lookup_blob(the_repository,
 866                                            &active_cache[i]->oid);
 867                         if (!blob)
 868                                 continue;
 869                         obj = &blob->object;
 870                         obj->flags |= USED;
 871                         if (name_objects)
 872                                 add_decoration(fsck_walk_options.object_names,
 873                                         obj,
 874                                         xstrfmt(":%s", active_cache[i]->name));
 875                         mark_object_reachable(obj);
 876                 }
 877                 if (active_cache_tree)
 878                         fsck_cache_tree(active_cache_tree);
 879         }
 880
 881         check_connectivity();
 882
 883         if (!git_config_get_bool("core.commitgraph", &i) && i) {
 884                 struct child_process commit_graph_verify = CHILD_PROCESS_INIT;
 885                 const char *verify_argv[] = { "commit-graph", "verify", NULL, NULL, NULL };
 886
 887                 commit_graph_verify.argv = verify_argv;
 888                 commit_graph_verify.git_cmd = 1;
 889                 if (run_command(&commit_graph_verify))
 890                         errors_found |= ERROR_COMMIT_GRAPH;
 891
 892                 prepare_alt_odb(the_repository);
 893                 for (alt =  the_repository->objects->alt_odb_list; alt; alt = alt->next) {
 894                         verify_argv[2] = "--object-dir";
 895                         verify_argv[3] = alt->path;
 896                         if (run_command(&commit_graph_verify))
 897                                 errors_found |= ERROR_COMMIT_GRAPH;
 898                 }
 899         }
 900
 901         if (!git_config_get_bool("core.multipackindex", &i) && i) {
 902                 struct child_process midx_verify = CHILD_PROCESS_INIT;
 903                 const char *midx_argv[] = { "multi-pack-index", "verify", NULL, NULL, NULL };
 904
 905                 midx_verify.argv = midx_argv;
 906                 midx_verify.git_cmd = 1;
 907                 if (run_command(&midx_verify))
 908                         errors_found |= ERROR_COMMIT_GRAPH;
 909
 910                 prepare_alt_odb(the_repository);
 911                 for (alt =  the_repository->objects->alt_odb_list; alt; alt = alt->next) {
 912                         midx_argv[2] = "--object-dir";
 913                         midx_argv[3] = alt->path;
 914                         if (run_command(&midx_verify))
 915                                 errors_found |= ERROR_COMMIT_GRAPH;
 916                 }
 917         }
 918
 919         return errors_found;
 920 }