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

   1 #define USE_THE_INDEX_COMPATIBILITY_MACROS
   2 #include "builtin.h"
   3 #include "cache.h"
   4 #include "repository.h"
   5 #include "config.h"
   6 #include "commit.h"
   7 #include "tree.h"
   8 #include "blob.h"
   9 #include "tag.h"
  10 #include "refs.h"
  11 #include "pack.h"
  12 #include "cache-tree.h"
  13 #include "tree-walk.h"
  14 #include "fsck.h"
  15 #include "parse-options.h"
  16 #include "dir.h"
  17 #include "progress.h"
  18 #include "streaming.h"
  19 #include "decorate.h"
  20 #include "packfile.h"
  21 #include "object-store.h"
  22 #include "run-command.h"
  23 #include "worktree.h"
  24
  25 #define REACHABLE 0x0001
  26 #define SEEN      0x0002
  27 #define HAS_OBJ   0x0004
  28 /* This flag is set if something points to this object. */
  29 #define USED      0x0008
  30
  31 static int show_root;
  32 static int show_tags;
  33 static int show_unreachable;
  34 static int include_reflogs = 1;
  35 static int check_full = 1;
  36 static int connectivity_only;
  37 static int check_strict;
  38 static int keep_cache_objects;
  39 static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
  40 static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
  41 static int errors_found;
  42 static int write_lost_and_found;
  43 static int verbose;
  44 static int show_progress = -1;
  45 static int show_dangling = 1;
  46 static int name_objects;
  47 #define ERROR_OBJECT 01
  48 #define ERROR_REACHABLE 02
  49 #define ERROR_PACK 04
  50 #define ERROR_REFS 010
  51 #define ERROR_COMMIT_GRAPH 020
  52 #define ERROR_MULTI_PACK_INDEX 040
  53
  54 static const char *describe_object(const struct object_id *oid)
  55 {
  56         return fsck_describe_object(&fsck_walk_options, oid);
  57 }
  58
  59 static const char *printable_type(const struct object_id *oid,
  60                                   enum object_type type)
  61 {
  62         const char *ret;
  63
  64         if (type == OBJ_NONE)
  65                 type = oid_object_info(the_repository, oid, NULL);
  66
  67         ret = type_name(type);
  68         if (!ret)
  69                 ret = _("unknown");
  70
  71         return ret;
  72 }
  73
  74 static int objerror(struct object *obj, const char *err)
  75 {
  76         errors_found |= ERROR_OBJECT;
  77         /* TRANSLATORS: e.g. error in tree 01bfda: <more explanation> */
  78         fprintf_ln(stderr, _("error in %s %s: %s"),
  79                    printable_type(&obj->oid, obj->type),
  80                    describe_object(&obj->oid), err);
  81         return -1;
  82 }
  83
  84 static int fsck_error_func(struct fsck_options *o,
  85                            const struct object_id *oid,
  86                            enum object_type object_type,
  87                            enum fsck_msg_type msg_type,
  88                            enum fsck_msg_id msg_id,
  89                            const char *message)
  90 {
  91         switch (msg_type) {
  92         case FSCK_WARN:
  93                 /* TRANSLATORS: e.g. warning in tree 01bfda: <more explanation> */
  94                 fprintf_ln(stderr, _("warning in %s %s: %s"),
  95                            printable_type(oid, object_type),
  96                            describe_object(oid), message);
  97                 return 0;
  98         case FSCK_ERROR:
  99                 /* TRANSLATORS: e.g. error in tree 01bfda: <more explanation> */
 100                 fprintf_ln(stderr, _("error in %s %s: %s"),
 101                            printable_type(oid, object_type),
 102                            describe_object(oid), message);
 103                 return 1;
 104         default:
 105                 BUG("%d (FSCK_IGNORE?) should never trigger this callback",
 106                     msg_type);
 107         }
 108 }
 109
 110 static struct object_array pending;
 111
 112 static int mark_object(struct object *obj, enum object_type type,
 113                        void *data, struct fsck_options *options)
 114 {
 115         struct object *parent = data;
 116
 117         /*
 118          * The only case data is NULL or type is OBJ_ANY is when
 119          * mark_object_reachable() calls us.  All the callers of
 120          * that function has non-NULL obj hence ...
 121          */
 122         if (!obj) {
 123                 /* ... these references to parent->fld are safe here */
 124                 printf_ln(_("broken link from %7s %s"),
 125                           printable_type(&parent->oid, parent->type),
 126                           describe_object(&parent->oid));
 127                 printf_ln(_("broken link from %7s %s"),
 128                           (type == OBJ_ANY ? _("unknown") : type_name(type)),
 129                           _("unknown"));
 130                 errors_found |= ERROR_REACHABLE;
 131                 return 1;
 132         }
 133
 134         if (type != OBJ_ANY && obj->type != type)
 135                 /* ... and the reference to parent is safe here */
 136                 objerror(parent, _("wrong object type in link"));
 137
 138         if (obj->flags & REACHABLE)
 139                 return 0;
 140         obj->flags |= REACHABLE;
 141
 142         if (is_promisor_object(&obj->oid))
 143                 /*
 144                  * Further recursion does not need to be performed on this
 145                  * object since it is a promisor object (so it does not need to
 146                  * be added to "pending").
 147                  */
 148                 return 0;
 149
 150         if (!(obj->flags & HAS_OBJ)) {
 151                 if (parent && !has_object(the_repository, &obj->oid, 1)) {
 152                         printf_ln(_("broken link from %7s %s\n"
 153                                     "              to %7s %s"),
 154                                   printable_type(&parent->oid, parent->type),
 155                                   describe_object(&parent->oid),
 156                                   printable_type(&obj->oid, obj->type),
 157                                   describe_object(&obj->oid));
 158                         errors_found |= ERROR_REACHABLE;
 159                 }
 160                 return 1;
 161         }
 162
 163         add_object_array(obj, NULL, &pending);
 164         return 0;
 165 }
 166
 167 static void mark_object_reachable(struct object *obj)
 168 {
 169         mark_object(obj, OBJ_ANY, NULL, NULL);
 170 }
 171
 172 static int traverse_one_object(struct object *obj)
 173 {
 174         int result = fsck_walk(obj, obj, &fsck_walk_options);
 175
 176         if (obj->type == OBJ_TREE) {
 177                 struct tree *tree = (struct tree *)obj;
 178                 free_tree_buffer(tree);
 179         }
 180         return result;
 181 }
 182
 183 static int traverse_reachable(void)
 184 {
 185         struct progress *progress = NULL;
 186         unsigned int nr = 0;
 187         int result = 0;
 188         if (show_progress)
 189                 progress = start_delayed_progress(_("Checking connectivity"), 0);
 190         while (pending.nr) {
 191                 result |= traverse_one_object(object_array_pop(&pending));
 192                 display_progress(progress, ++nr);
 193         }
 194         stop_progress(&progress);
 195         return !!result;
 196 }
 197
 198 static int mark_used(struct object *obj, enum object_type object_type,
 199                      void *data, struct fsck_options *options)
 200 {
 201         if (!obj)
 202                 return 1;
 203         obj->flags |= USED;
 204         return 0;
 205 }
 206
 207 static void mark_unreachable_referents(const struct object_id *oid)
 208 {
 209         struct fsck_options options = FSCK_OPTIONS_DEFAULT;
 210         struct object *obj = lookup_object(the_repository, oid);
 211
 212         if (!obj || !(obj->flags & HAS_OBJ))
 213                 return; /* not part of our original set */
 214         if (obj->flags & REACHABLE)
 215                 return; /* reachable objects already traversed */
 216
 217         /*
 218          * Avoid passing OBJ_NONE to fsck_walk, which will parse the object
 219          * (and we want to avoid parsing blobs).
 220          */
 221         if (obj->type == OBJ_NONE) {
 222                 enum object_type type = oid_object_info(the_repository,
 223                                                         &obj->oid, NULL);
 224                 if (type > 0)
 225                         object_as_type(obj, type, 0);
 226         }
 227
 228         options.walk = mark_used;
 229         fsck_walk(obj, NULL, &options);
 230 }
 231
 232 static int mark_loose_unreachable_referents(const struct object_id *oid,
 233                                             const char *path,
 234                                             void *data)
 235 {
 236         mark_unreachable_referents(oid);
 237         return 0;
 238 }
 239
 240 static int mark_packed_unreachable_referents(const struct object_id *oid,
 241                                              struct packed_git *pack,
 242                                              uint32_t pos,
 243                                              void *data)
 244 {
 245         mark_unreachable_referents(oid);
 246         return 0;
 247 }
 248
 249 /*
 250  * Check a single reachable object
 251  */
 252 static void check_reachable_object(struct object *obj)
 253 {
 254         /*
 255          * We obviously want the object to be parsed,
 256          * except if it was in a pack-file and we didn't
 257          * do a full fsck
 258          */
 259         if (!(obj->flags & HAS_OBJ)) {
 260                 if (is_promisor_object(&obj->oid))
 261                         return;
 262                 if (has_object_pack(&obj->oid))
 263                         return; /* it is in pack - forget about it */
 264                 printf_ln(_("missing %s %s"),
 265                           printable_type(&obj->oid, obj->type),
 266                           describe_object(&obj->oid));
 267                 errors_found |= ERROR_REACHABLE;
 268                 return;
 269         }
 270 }
 271
 272 /*
 273  * Check a single unreachable object
 274  */
 275 static void check_unreachable_object(struct object *obj)
 276 {
 277         /*
 278          * Missing unreachable object? Ignore it. It's not like
 279          * we miss it (since it can't be reached), nor do we want
 280          * to complain about it being unreachable (since it does
 281          * not exist).
 282          */
 283         if (!(obj->flags & HAS_OBJ))
 284                 return;
 285
 286         /*
 287          * Unreachable object that exists? Show it if asked to,
 288          * since this is something that is prunable.
 289          */
 290         if (show_unreachable) {
 291                 printf_ln(_("unreachable %s %s"),
 292                           printable_type(&obj->oid, obj->type),
 293                           describe_object(&obj->oid));
 294                 return;
 295         }
 296
 297         /*
 298          * "!USED" means that nothing at all points to it, including
 299          * other unreachable objects. In other words, it's the "tip"
 300          * of some set of unreachable objects, usually a commit that
 301          * got dropped.
 302          *
 303          * Such starting points are more interesting than some random
 304          * set of unreachable objects, so we show them even if the user
 305          * hasn't asked for _all_ unreachable objects. If you have
 306          * deleted a branch by mistake, this is a prime candidate to
 307          * start looking at, for example.
 308          */
 309         if (!(obj->flags & USED)) {
 310                 if (show_dangling)
 311                         printf_ln(_("dangling %s %s"),
 312                                   printable_type(&obj->oid, obj->type),
 313                                   describe_object(&obj->oid));
 314                 if (write_lost_and_found) {
 315                         char *filename = git_pathdup("lost-found/%s/%s",
 316                                 obj->type == OBJ_COMMIT ? "commit" : "other",
 317                                 describe_object(&obj->oid));
 318                         FILE *f;
 319
 320                         if (safe_create_leading_directories_const(filename)) {
 321                                 error(_("could not create lost-found"));
 322                                 free(filename);
 323                                 return;
 324                         }
 325                         f = xfopen(filename, "w");
 326                         if (obj->type == OBJ_BLOB) {
 327                                 if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
 328                                         die_errno(_("could not write '%s'"), filename);
 329                         } else
 330                                 fprintf(f, "%s\n", describe_object(&obj->oid));
 331                         if (fclose(f))
 332                                 die_errno(_("could not finish '%s'"),
 333                                           filename);
 334                         free(filename);
 335                 }
 336                 return;
 337         }
 338
 339         /*
 340          * Otherwise? It's there, it's unreachable, and some other unreachable
 341          * object points to it. Ignore it - it's not interesting, and we showed
 342          * all the interesting cases above.
 343          */
 344 }
 345
 346 static void check_object(struct object *obj)
 347 {
 348         if (verbose)
 349                 fprintf_ln(stderr, _("Checking %s"), describe_object(&obj->oid));
 350
 351         if (obj->flags & REACHABLE)
 352                 check_reachable_object(obj);
 353         else
 354                 check_unreachable_object(obj);
 355 }
 356
 357 static void check_connectivity(void)
 358 {
 359         int i, max;
 360
 361         /* Traverse the pending reachable objects */
 362         traverse_reachable();
 363
 364         /*
 365          * With --connectivity-only, we won't have actually opened and marked
 366          * unreachable objects with USED. Do that now to make --dangling, etc
 367          * accurate.
 368          */
 369         if (connectivity_only && (show_dangling || write_lost_and_found)) {
 370                 /*
 371                  * Even though we already have a "struct object" for each of
 372                  * these in memory, we must not iterate over the internal
 373                  * object hash as we do below. Our loop would potentially
 374                  * resize the hash, making our iteration invalid.
 375                  *
 376                  * Instead, we'll just go back to the source list of objects,
 377                  * and ignore any that weren't present in our earlier
 378                  * traversal.
 379                  */
 380                 for_each_loose_object(mark_loose_unreachable_referents, NULL, 0);
 381                 for_each_packed_object(mark_packed_unreachable_referents, NULL, 0);
 382         }
 383
 384         /* Look up all the requirements, warn about missing objects.. */
 385         max = get_max_object_index();
 386         if (verbose)
 387                 fprintf_ln(stderr, _("Checking connectivity (%d objects)"), max);
 388
 389         for (i = 0; i < max; i++) {
 390                 struct object *obj = get_indexed_object(i);
 391
 392                 if (obj)
 393                         check_object(obj);
 394         }
 395 }
 396
 397 static int fsck_obj(struct object *obj, void *buffer, unsigned long size)
 398 {
 399         int err;
 400
 401         if (obj->flags & SEEN)
 402                 return 0;
 403         obj->flags |= SEEN;
 404
 405         if (verbose)
 406                 fprintf_ln(stderr, _("Checking %s %s"),
 407                            printable_type(&obj->oid, obj->type),
 408                            describe_object(&obj->oid));
 409
 410         if (fsck_walk(obj, NULL, &fsck_obj_options))
 411                 objerror(obj, _("broken links"));
 412         err = fsck_object(obj, buffer, size, &fsck_obj_options);
 413         if (err)
 414                 goto out;
 415
 416         if (obj->type == OBJ_COMMIT) {
 417                 struct commit *commit = (struct commit *) obj;
 418
 419                 if (!commit->parents && show_root)
 420                         printf_ln(_("root %s"),
 421                                   describe_object(&commit->object.oid));
 422         }
 423
 424         if (obj->type == OBJ_TAG) {
 425                 struct tag *tag = (struct tag *) obj;
 426
 427                 if (show_tags && tag->tagged) {
 428                         printf_ln(_("tagged %s %s (%s) in %s"),
 429                                   printable_type(&tag->tagged->oid, tag->tagged->type),
 430                                   describe_object(&tag->tagged->oid),
 431                                   tag->tag,
 432                                   describe_object(&tag->object.oid));
 433                 }
 434         }
 435
 436 out:
 437         if (obj->type == OBJ_TREE)
 438                 free_tree_buffer((struct tree *)obj);
 439         if (obj->type == OBJ_COMMIT)
 440                 free_commit_buffer(the_repository->parsed_objects,
 441                                    (struct commit *)obj);
 442         return err;
 443 }
 444
 445 static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
 446                            unsigned long size, void *buffer, int *eaten)
 447 {
 448         /*
 449          * Note, buffer may be NULL if type is OBJ_BLOB. See
 450          * verify_packfile(), data_valid variable for details.
 451          */
 452         struct object *obj;
 453         obj = parse_object_buffer(the_repository, oid, type, size, buffer,
 454                                   eaten);
 455         if (!obj) {
 456                 errors_found |= ERROR_OBJECT;
 457                 return error(_("%s: object corrupt or missing"),
 458                              oid_to_hex(oid));
 459         }
 460         obj->flags &= ~(REACHABLE | SEEN);
 461         obj->flags |= HAS_OBJ;
 462         return fsck_obj(obj, buffer, size);
 463 }
 464
 465 static int default_refs;
 466
 467 static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
 468         timestamp_t timestamp)
 469 {
 470         struct object *obj;
 471
 472         if (!is_null_oid(oid)) {
 473                 obj = lookup_object(the_repository, oid);
 474                 if (obj && (obj->flags & HAS_OBJ)) {
 475                         if (timestamp)
 476                                 fsck_put_object_name(&fsck_walk_options, oid,
 477                                                      "%s@{%"PRItime"}",
 478                                                      refname, timestamp);
 479                         obj->flags |= USED;
 480                         mark_object_reachable(obj);
 481                 } else if (!is_promisor_object(oid)) {
 482                         error(_("%s: invalid reflog entry %s"),
 483                               refname, oid_to_hex(oid));
 484                         errors_found |= ERROR_REACHABLE;
 485                 }
 486         }
 487 }
 488
 489 static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid,
 490                 const char *email, timestamp_t timestamp, int tz,
 491                 const char *message, void *cb_data)
 492 {
 493         const char *refname = cb_data;
 494
 495         if (verbose)
 496                 fprintf_ln(stderr, _("Checking reflog %s->%s"),
 497                            oid_to_hex(ooid), oid_to_hex(noid));
 498
 499         fsck_handle_reflog_oid(refname, ooid, 0);
 500         fsck_handle_reflog_oid(refname, noid, timestamp);
 501         return 0;
 502 }
 503
 504 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
 505                               int flag, void *cb_data)
 506 {
 507         struct strbuf refname = STRBUF_INIT;
 508
 509         strbuf_worktree_ref(cb_data, &refname, logname);
 510         for_each_reflog_ent(refname.buf, fsck_handle_reflog_ent, refname.buf);
 511         strbuf_release(&refname);
 512         return 0;
 513 }
 514
 515 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 516                            int flag, void *cb_data)
 517 {
 518         struct object *obj;
 519
 520         obj = parse_object(the_repository, oid);
 521         if (!obj) {
 522                 if (is_promisor_object(oid)) {
 523                         /*
 524                          * Increment default_refs anyway, because this is a
 525                          * valid ref.
 526                          */
 527                          default_refs++;
 528                          return 0;
 529                 }
 530                 error(_("%s: invalid sha1 pointer %s"),
 531                       refname, oid_to_hex(oid));
 532                 errors_found |= ERROR_REACHABLE;
 533                 /* We'll continue with the rest despite the error.. */
 534                 return 0;
 535         }
 536         if (obj->type != OBJ_COMMIT && is_branch(refname)) {
 537                 error(_("%s: not a commit"), refname);
 538                 errors_found |= ERROR_REFS;
 539         }
 540         default_refs++;
 541         obj->flags |= USED;
 542         fsck_put_object_name(&fsck_walk_options,
 543                              oid, "%s", refname);
 544         mark_object_reachable(obj);
 545
 546         return 0;
 547 }
 548
 549 static int fsck_head_link(const char *head_ref_name,
 550                           const char **head_points_at,
 551                           struct object_id *head_oid);
 552
 553 static void get_default_heads(void)
 554 {
 555         struct worktree **worktrees, **p;
 556         const char *head_points_at;
 557         struct object_id head_oid;
 558
 559         for_each_rawref(fsck_handle_ref, NULL);
 560
 561         worktrees = get_worktrees();
 562         for (p = worktrees; *p; p++) {
 563                 struct worktree *wt = *p;
 564                 struct strbuf ref = STRBUF_INIT;
 565
 566                 strbuf_worktree_ref(wt, &ref, "HEAD");
 567                 fsck_head_link(ref.buf, &head_points_at, &head_oid);
 568                 if (head_points_at && !is_null_oid(&head_oid))
 569                         fsck_handle_ref(ref.buf, &head_oid, 0, NULL);
 570                 strbuf_release(&ref);
 571
 572                 if (include_reflogs)
 573                         refs_for_each_reflog(get_worktree_ref_store(wt),
 574                                              fsck_handle_reflog, wt);
 575         }
 576         free_worktrees(worktrees);
 577
 578         /*
 579          * Not having any default heads isn't really fatal, but
 580          * it does mean that "--unreachable" no longer makes any
 581          * sense (since in this case everything will obviously
 582          * be unreachable by definition.
 583          *
 584          * Showing dangling objects is valid, though (as those
 585          * dangling objects are likely lost heads).
 586          *
 587          * So we just print a warning about it, and clear the
 588          * "show_unreachable" flag.
 589          */
 590         if (!default_refs) {
 591                 fprintf_ln(stderr, _("notice: No default references"));
 592                 show_unreachable = 0;
 593         }
 594 }
 595
 596 static int fsck_loose(const struct object_id *oid, const char *path, void *data)
 597 {
 598         struct object *obj;
 599         enum object_type type;
 600         unsigned long size;
 601         void *contents;
 602         int eaten;
 603
 604         if (read_loose_object(path, oid, &type, &size, &contents) < 0) {
 605                 errors_found |= ERROR_OBJECT;
 606                 error(_("%s: object corrupt or missing: %s"),
 607                       oid_to_hex(oid), path);
 608                 return 0; /* keep checking other objects */
 609         }
 610
 611         if (!contents && type != OBJ_BLOB)
 612                 BUG("read_loose_object streamed a non-blob");
 613
 614         obj = parse_object_buffer(the_repository, oid, type, size,
 615                                   contents, &eaten);
 616
 617         if (!obj) {
 618                 errors_found |= ERROR_OBJECT;
 619                 error(_("%s: object could not be parsed: %s"),
 620                       oid_to_hex(oid), path);
 621                 if (!eaten)
 622                         free(contents);
 623                 return 0; /* keep checking other objects */
 624         }
 625
 626         obj->flags &= ~(REACHABLE | SEEN);
 627         obj->flags |= HAS_OBJ;
 628         if (fsck_obj(obj, contents, size))
 629                 errors_found |= ERROR_OBJECT;
 630
 631         if (!eaten)
 632                 free(contents);
 633         return 0; /* keep checking other objects, even if we saw an error */
 634 }
 635
 636 static int fsck_cruft(const char *basename, const char *path, void *data)
 637 {
 638         if (!starts_with(basename, "tmp_obj_"))
 639                 fprintf_ln(stderr, _("bad sha1 file: %s"), path);
 640         return 0;
 641 }
 642
 643 static int fsck_subdir(unsigned int nr, const char *path, void *progress)
 644 {
 645         display_progress(progress, nr + 1);
 646         return 0;
 647 }
 648
 649 static void fsck_object_dir(const char *path)
 650 {
 651         struct progress *progress = NULL;
 652
 653         if (verbose)
 654                 fprintf_ln(stderr, _("Checking object directory"));
 655
 656         if (show_progress)
 657                 progress = start_progress(_("Checking object directories"), 256);
 658
 659         for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
 660                                       progress);
 661         display_progress(progress, 256);
 662         stop_progress(&progress);
 663 }
 664
 665 static int fsck_head_link(const char *head_ref_name,
 666                           const char **head_points_at,
 667                           struct object_id *head_oid)
 668 {
 669         int null_is_error = 0;
 670
 671         if (verbose)
 672                 fprintf_ln(stderr, _("Checking %s link"), head_ref_name);
 673
 674         *head_points_at = resolve_ref_unsafe(head_ref_name, 0, head_oid, NULL);
 675         if (!*head_points_at) {
 676                 errors_found |= ERROR_REFS;
 677                 return error(_("invalid %s"), head_ref_name);
 678         }
 679         if (!strcmp(*head_points_at, head_ref_name))
 680                 /* detached HEAD */
 681                 null_is_error = 1;
 682         else if (!starts_with(*head_points_at, "refs/heads/")) {
 683                 errors_found |= ERROR_REFS;
 684                 return error(_("%s points to something strange (%s)"),
 685                              head_ref_name, *head_points_at);
 686         }
 687         if (is_null_oid(head_oid)) {
 688                 if (null_is_error) {
 689                         errors_found |= ERROR_REFS;
 690                         return error(_("%s: detached HEAD points at nothing"),
 691                                      head_ref_name);
 692                 }
 693                 fprintf_ln(stderr,
 694                            _("notice: %s points to an unborn branch (%s)"),
 695                            head_ref_name, *head_points_at + 11);
 696         }
 697         return 0;
 698 }
 699
 700 static int fsck_cache_tree(struct cache_tree *it)
 701 {
 702         int i;
 703         int err = 0;
 704
 705         if (verbose)
 706                 fprintf_ln(stderr, _("Checking cache tree"));
 707
 708         if (0 <= it->entry_count) {
 709                 struct object *obj = parse_object(the_repository, &it->oid);
 710                 if (!obj) {
 711                         error(_("%s: invalid sha1 pointer in cache-tree"),
 712                               oid_to_hex(&it->oid));
 713                         errors_found |= ERROR_REFS;
 714                         return 1;
 715                 }
 716                 obj->flags |= USED;
 717                 fsck_put_object_name(&fsck_walk_options, &it->oid, ":");
 718                 mark_object_reachable(obj);
 719                 if (obj->type != OBJ_TREE)
 720                         err |= objerror(obj, _("non-tree in cache-tree"));
 721         }
 722         for (i = 0; i < it->subtree_nr; i++)
 723                 err |= fsck_cache_tree(it->down[i]->cache_tree);
 724         return err;
 725 }
 726
 727 static void mark_object_for_connectivity(const struct object_id *oid)
 728 {
 729         struct object *obj = lookup_unknown_object(the_repository, oid);
 730         obj->flags |= HAS_OBJ;
 731 }
 732
 733 static int mark_loose_for_connectivity(const struct object_id *oid,
 734                                        const char *path,
 735                                        void *data)
 736 {
 737         mark_object_for_connectivity(oid);
 738         return 0;
 739 }
 740
 741 static int mark_packed_for_connectivity(const struct object_id *oid,
 742                                         struct packed_git *pack,
 743                                         uint32_t pos,
 744                                         void *data)
 745 {
 746         mark_object_for_connectivity(oid);
 747         return 0;
 748 }
 749
 750 static char const * const fsck_usage[] = {
 751         N_("git fsck [<options>] [<object>...]"),
 752         NULL
 753 };
 754
 755 static struct option fsck_opts[] = {
 756         OPT__VERBOSE(&verbose, N_("be verbose")),
 757         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
 758         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
 759         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
 760         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
 761         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
 762         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
 763         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
 764         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
 765         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
 766         OPT_BOOL(0, "lost-found", &write_lost_and_found,
 767                                 N_("write dangling objects in .git/lost-found")),
 768         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 769         OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
 770         OPT_END(),
 771 };
 772
 773 int cmd_fsck(int argc, const char **argv, const char *prefix)
 774 {
 775         int i;
 776         struct object_directory *odb;
 777
 778         /* fsck knows how to handle missing promisor objects */
 779         fetch_if_missing = 0;
 780
 781         errors_found = 0;
 782         read_replace_refs = 0;
 783
 784         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 785
 786         fsck_walk_options.walk = mark_object;
 787         fsck_obj_options.walk = mark_used;
 788         fsck_obj_options.error_func = fsck_error_func;
 789         if (check_strict)
 790                 fsck_obj_options.strict = 1;
 791
 792         if (show_progress == -1)
 793                 show_progress = isatty(2);
 794         if (verbose)
 795                 show_progress = 0;
 796
 797         if (write_lost_and_found) {
 798                 check_full = 1;
 799                 include_reflogs = 0;
 800         }
 801
 802         if (name_objects)
 803                 fsck_enable_object_names(&fsck_walk_options);
 804
 805         git_config(git_fsck_config, &fsck_obj_options);
 806
 807         if (connectivity_only) {
 808                 for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
 809                 for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
 810         } else {
 811                 prepare_alt_odb(the_repository);
 812                 for (odb = the_repository->objects->odb; odb; odb = odb->next)
 813                         fsck_object_dir(odb->path);
 814
 815                 if (check_full) {
 816                         struct packed_git *p;
 817                         uint32_t total = 0, count = 0;
 818                         struct progress *progress = NULL;
 819
 820                         if (show_progress) {
 821                                 for (p = get_all_packs(the_repository); p;
 822                                      p = p->next) {
 823                                         if (open_pack_index(p))
 824                                                 continue;
 825                                         total += p->num_objects;
 826                                 }
 827
 828                                 progress = start_progress(_("Checking objects"), total);
 829                         }
 830                         for (p = get_all_packs(the_repository); p;
 831                              p = p->next) {
 832                                 /* verify gives error messages itself */
 833                                 if (verify_pack(the_repository,
 834                                                 p, fsck_obj_buffer,
 835                                                 progress, count))
 836                                         errors_found |= ERROR_PACK;
 837                                 count += p->num_objects;
 838                         }
 839                         stop_progress(&progress);
 840                 }
 841
 842                 if (fsck_finish(&fsck_obj_options))
 843                         errors_found |= ERROR_OBJECT;
 844         }
 845
 846         for (i = 0; i < argc; i++) {
 847                 const char *arg = argv[i];
 848                 struct object_id oid;
 849                 if (!get_oid(arg, &oid)) {
 850                         struct object *obj = lookup_object(the_repository,
 851                                                            &oid);
 852
 853                         if (!obj || !(obj->flags & HAS_OBJ)) {
 854                                 if (is_promisor_object(&oid))
 855                                         continue;
 856                                 error(_("%s: object missing"), oid_to_hex(&oid));
 857                                 errors_found |= ERROR_OBJECT;
 858                                 continue;
 859                         }
 860
 861                         obj->flags |= USED;
 862                         fsck_put_object_name(&fsck_walk_options, &oid,
 863                                              "%s", arg);
 864                         mark_object_reachable(obj);
 865                         continue;
 866                 }
 867                 error(_("invalid parameter: expected sha1, got '%s'"), arg);
 868                 errors_found |= ERROR_OBJECT;
 869         }
 870
 871         /*
 872          * If we've not been given any explicit head information, do the
 873          * default ones from .git/refs. We also consider the index file
 874          * in this case (ie this implies --cache).
 875          */
 876         if (!argc) {
 877                 get_default_heads();
 878                 keep_cache_objects = 1;
 879         }
 880
 881         if (keep_cache_objects) {
 882                 verify_index_checksum = 1;
 883                 verify_ce_order = 1;
 884                 read_cache();
 885                 /* TODO: audit for interaction with sparse-index. */
 886                 ensure_full_index(&the_index);
 887                 for (i = 0; i < active_nr; i++) {
 888                         unsigned int mode;
 889                         struct blob *blob;
 890                         struct object *obj;
 891
 892                         mode = active_cache[i]->ce_mode;
 893                         if (S_ISGITLINK(mode))
 894                                 continue;
 895                         blob = lookup_blob(the_repository,
 896                                            &active_cache[i]->oid);
 897                         if (!blob)
 898                                 continue;
 899                         obj = &blob->object;
 900                         obj->flags |= USED;
 901                         fsck_put_object_name(&fsck_walk_options, &obj->oid,
 902                                              ":%s", active_cache[i]->name);
 903                         mark_object_reachable(obj);
 904                 }
 905                 if (active_cache_tree)
 906                         fsck_cache_tree(active_cache_tree);
 907         }
 908
 909         check_connectivity();
 910
 911         if (!git_config_get_bool("core.commitgraph", &i) && i) {
 912                 struct child_process commit_graph_verify = CHILD_PROCESS_INIT;
 913                 const char *verify_argv[] = { "commit-graph", "verify", NULL, NULL, NULL };
 914
 915                 prepare_alt_odb(the_repository);
 916                 for (odb = the_repository->objects->odb; odb; odb = odb->next) {
 917                         child_process_init(&commit_graph_verify);
 918                         commit_graph_verify.argv = verify_argv;
 919                         commit_graph_verify.git_cmd = 1;
 920                         verify_argv[2] = "--object-dir";
 921                         verify_argv[3] = odb->path;
 922                         if (run_command(&commit_graph_verify))
 923                                 errors_found |= ERROR_COMMIT_GRAPH;
 924                 }
 925         }
 926
 927         if (!git_config_get_bool("core.multipackindex", &i) && i) {
 928                 struct child_process midx_verify = CHILD_PROCESS_INIT;
 929                 const char *midx_argv[] = { "multi-pack-index", "verify", NULL, NULL, NULL };
 930
 931                 prepare_alt_odb(the_repository);
 932                 for (odb = the_repository->objects->odb; odb; odb = odb->next) {
 933                         child_process_init(&midx_verify);
 934                         midx_verify.argv = midx_argv;
 935                         midx_verify.git_cmd = 1;
 936                         midx_argv[2] = "--object-dir";
 937                         midx_argv[3] = odb->path;
 938                         if (run_command(&midx_verify))
 939                                 errors_found |= ERROR_MULTI_PACK_INDEX;
 940                 }
 941         }
 942
 943         return errors_found;
 944 }