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
  53 static const char *describe_object(const struct object_id *oid)
  54 {
  55         return fsck_describe_object(&fsck_walk_options, oid);
  56 }
  57
  58 static const char *printable_type(const struct object_id *oid,
  59                                   enum object_type type)
  60 {
  61         const char *ret;
  62
  63         if (type == OBJ_NONE)
  64                 type = oid_object_info(the_repository, oid, NULL);
  65
  66         ret = type_name(type);
  67         if (!ret)
  68                 ret = _("unknown");
  69
  70         return ret;
  71 }
  72
  73 static int fsck_config(const char *var, const char *value, void *cb)
  74 {
  75         if (strcmp(var, "fsck.skiplist") == 0) {
  76                 const char *path;
  77                 struct strbuf sb = STRBUF_INIT;
  78
  79                 if (git_config_pathname(&path, var, value))
  80                         return 1;
  81                 strbuf_addf(&sb, "skiplist=%s", path);
  82                 free((char *)path);
  83                 fsck_set_msg_types(&fsck_obj_options, sb.buf);
  84                 strbuf_release(&sb);
  85                 return 0;
  86         }
  87
  88         if (skip_prefix(var, "fsck.", &var)) {
  89                 fsck_set_msg_type(&fsck_obj_options, var, value);
  90                 return 0;
  91         }
  92
  93         return git_default_config(var, value, cb);
  94 }
  95
  96 static int objerror(struct object *obj, const char *err)
  97 {
  98         errors_found |= ERROR_OBJECT;
  99         /* TRANSLATORS: e.g. error in tree 01bfda: <more explanation> */
 100         fprintf_ln(stderr, _("error in %s %s: %s"),
 101                    printable_type(&obj->oid, obj->type),
 102                    describe_object(&obj->oid), err);
 103         return -1;
 104 }
 105
 106 static int fsck_error_func(struct fsck_options *o,
 107                            const struct object_id *oid,
 108                            enum object_type object_type,
 109                            int msg_type, const char *message)
 110 {
 111         switch (msg_type) {
 112         case FSCK_WARN:
 113                 /* TRANSLATORS: e.g. warning in tree 01bfda: <more explanation> */
 114                 fprintf_ln(stderr, _("warning in %s %s: %s"),
 115                            printable_type(oid, object_type),
 116                            describe_object(oid), message);
 117                 return 0;
 118         case FSCK_ERROR:
 119                 /* TRANSLATORS: e.g. error in tree 01bfda: <more explanation> */
 120                 fprintf_ln(stderr, _("error in %s %s: %s"),
 121                            printable_type(oid, object_type),
 122                            describe_object(oid), message);
 123                 return 1;
 124         default:
 125                 BUG("%d (FSCK_IGNORE?) should never trigger this callback",
 126                     msg_type);
 127         }
 128 }
 129
 130 static struct object_array pending;
 131
 132 static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
 133 {
 134         struct object *parent = data;
 135
 136         /*
 137          * The only case data is NULL or type is OBJ_ANY is when
 138          * mark_object_reachable() calls us.  All the callers of
 139          * that function has non-NULL obj hence ...
 140          */
 141         if (!obj) {
 142                 /* ... these references to parent->fld are safe here */
 143                 printf_ln(_("broken link from %7s %s"),
 144                           printable_type(&parent->oid, parent->type),
 145                           describe_object(&parent->oid));
 146                 printf_ln(_("broken link from %7s %s"),
 147                           (type == OBJ_ANY ? _("unknown") : type_name(type)),
 148                           _("unknown"));
 149                 errors_found |= ERROR_REACHABLE;
 150                 return 1;
 151         }
 152
 153         if (type != OBJ_ANY && obj->type != type)
 154                 /* ... and the reference to parent is safe here */
 155                 objerror(parent, _("wrong object type in link"));
 156
 157         if (obj->flags & REACHABLE)
 158                 return 0;
 159         obj->flags |= REACHABLE;
 160
 161         if (is_promisor_object(&obj->oid))
 162                 /*
 163                  * Further recursion does not need to be performed on this
 164                  * object since it is a promisor object (so it does not need to
 165                  * be added to "pending").
 166                  */
 167                 return 0;
 168
 169         if (!(obj->flags & HAS_OBJ)) {
 170                 if (parent && !has_object_file(&obj->oid)) {
 171                         printf_ln(_("broken link from %7s %s\n"
 172                                     "              to %7s %s"),
 173                                   printable_type(&parent->oid, parent->type),
 174                                   describe_object(&parent->oid),
 175                                   printable_type(&obj->oid, obj->type),
 176                                   describe_object(&obj->oid));
 177                         errors_found |= ERROR_REACHABLE;
 178                 }
 179                 return 1;
 180         }
 181
 182         add_object_array(obj, NULL, &pending);
 183         return 0;
 184 }
 185
 186 static void mark_object_reachable(struct object *obj)
 187 {
 188         mark_object(obj, OBJ_ANY, NULL, NULL);
 189 }
 190
 191 static int traverse_one_object(struct object *obj)
 192 {
 193         int result = fsck_walk(obj, obj, &fsck_walk_options);
 194
 195         if (obj->type == OBJ_TREE) {
 196                 struct tree *tree = (struct tree *)obj;
 197                 free_tree_buffer(tree);
 198         }
 199         return result;
 200 }
 201
 202 static int traverse_reachable(void)
 203 {
 204         struct progress *progress = NULL;
 205         unsigned int nr = 0;
 206         int result = 0;
 207         if (show_progress)
 208                 progress = start_delayed_progress(_("Checking connectivity"), 0);
 209         while (pending.nr) {
 210                 result |= traverse_one_object(object_array_pop(&pending));
 211                 display_progress(progress, ++nr);
 212         }
 213         stop_progress(&progress);
 214         return !!result;
 215 }
 216
 217 static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
 218 {
 219         if (!obj)
 220                 return 1;
 221         obj->flags |= USED;
 222         return 0;
 223 }
 224
 225 static void mark_unreachable_referents(const struct object_id *oid)
 226 {
 227         struct fsck_options options = FSCK_OPTIONS_DEFAULT;
 228         struct object *obj = lookup_object(the_repository, oid);
 229
 230         if (!obj || !(obj->flags & HAS_OBJ))
 231                 return; /* not part of our original set */
 232         if (obj->flags & REACHABLE)
 233                 return; /* reachable objects already traversed */
 234
 235         /*
 236          * Avoid passing OBJ_NONE to fsck_walk, which will parse the object
 237          * (and we want to avoid parsing blobs).
 238          */
 239         if (obj->type == OBJ_NONE) {
 240                 enum object_type type = oid_object_info(the_repository,
 241                                                         &obj->oid, NULL);
 242                 if (type > 0)
 243                         object_as_type(the_repository, obj, type, 0);
 244         }
 245
 246         options.walk = mark_used;
 247         fsck_walk(obj, NULL, &options);
 248 }
 249
 250 static int mark_loose_unreachable_referents(const struct object_id *oid,
 251                                             const char *path,
 252                                             void *data)
 253 {
 254         mark_unreachable_referents(oid);
 255         return 0;
 256 }
 257
 258 static int mark_packed_unreachable_referents(const struct object_id *oid,
 259                                              struct packed_git *pack,
 260                                              uint32_t pos,
 261                                              void *data)
 262 {
 263         mark_unreachable_referents(oid);
 264         return 0;
 265 }
 266
 267 /*
 268  * Check a single reachable object
 269  */
 270 static void check_reachable_object(struct object *obj)
 271 {
 272         /*
 273          * We obviously want the object to be parsed,
 274          * except if it was in a pack-file and we didn't
 275          * do a full fsck
 276          */
 277         if (!(obj->flags & HAS_OBJ)) {
 278                 if (is_promisor_object(&obj->oid))
 279                         return;
 280                 if (has_object_pack(&obj->oid))
 281                         return; /* it is in pack - forget about it */
 282                 printf_ln(_("missing %s %s"),
 283                           printable_type(&obj->oid, obj->type),
 284                           describe_object(&obj->oid));
 285                 errors_found |= ERROR_REACHABLE;
 286                 return;
 287         }
 288 }
 289
 290 /*
 291  * Check a single unreachable object
 292  */
 293 static void check_unreachable_object(struct object *obj)
 294 {
 295         /*
 296          * Missing unreachable object? Ignore it. It's not like
 297          * we miss it (since it can't be reached), nor do we want
 298          * to complain about it being unreachable (since it does
 299          * not exist).
 300          */
 301         if (!(obj->flags & HAS_OBJ))
 302                 return;
 303
 304         /*
 305          * Unreachable object that exists? Show it if asked to,
 306          * since this is something that is prunable.
 307          */
 308         if (show_unreachable) {
 309                 printf_ln(_("unreachable %s %s"),
 310                           printable_type(&obj->oid, obj->type),
 311                           describe_object(&obj->oid));
 312                 return;
 313         }
 314
 315         /*
 316          * "!USED" means that nothing at all points to it, including
 317          * other unreachable objects. In other words, it's the "tip"
 318          * of some set of unreachable objects, usually a commit that
 319          * got dropped.
 320          *
 321          * Such starting points are more interesting than some random
 322          * set of unreachable objects, so we show them even if the user
 323          * hasn't asked for _all_ unreachable objects. If you have
 324          * deleted a branch by mistake, this is a prime candidate to
 325          * start looking at, for example.
 326          */
 327         if (!(obj->flags & USED)) {
 328                 if (show_dangling)
 329                         printf_ln(_("dangling %s %s"),
 330                                   printable_type(&obj->oid, obj->type),
 331                                   describe_object(&obj->oid));
 332                 if (write_lost_and_found) {
 333                         char *filename = git_pathdup("lost-found/%s/%s",
 334                                 obj->type == OBJ_COMMIT ? "commit" : "other",
 335                                 describe_object(&obj->oid));
 336                         FILE *f;
 337
 338                         if (safe_create_leading_directories_const(filename)) {
 339                                 error(_("could not create lost-found"));
 340                                 free(filename);
 341                                 return;
 342                         }
 343                         f = xfopen(filename, "w");
 344                         if (obj->type == OBJ_BLOB) {
 345                                 if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
 346                                         die_errno(_("could not write '%s'"), filename);
 347                         } else
 348                                 fprintf(f, "%s\n", describe_object(&obj->oid));
 349                         if (fclose(f))
 350                                 die_errno(_("could not finish '%s'"),
 351                                           filename);
 352                         free(filename);
 353                 }
 354                 return;
 355         }
 356
 357         /*
 358          * Otherwise? It's there, it's unreachable, and some other unreachable
 359          * object points to it. Ignore it - it's not interesting, and we showed
 360          * all the interesting cases above.
 361          */
 362 }
 363
 364 static void check_object(struct object *obj)
 365 {
 366         if (verbose)
 367                 fprintf_ln(stderr, _("Checking %s"), describe_object(&obj->oid));
 368
 369         if (obj->flags & REACHABLE)
 370                 check_reachable_object(obj);
 371         else
 372                 check_unreachable_object(obj);
 373 }
 374
 375 static void check_connectivity(void)
 376 {
 377         int i, max;
 378
 379         /* Traverse the pending reachable objects */
 380         traverse_reachable();
 381
 382         /*
 383          * With --connectivity-only, we won't have actually opened and marked
 384          * unreachable objects with USED. Do that now to make --dangling, etc
 385          * accurate.
 386          */
 387         if (connectivity_only && (show_dangling || write_lost_and_found)) {
 388                 /*
 389                  * Even though we already have a "struct object" for each of
 390                  * these in memory, we must not iterate over the internal
 391                  * object hash as we do below. Our loop would potentially
 392                  * resize the hash, making our iteration invalid.
 393                  *
 394                  * Instead, we'll just go back to the source list of objects,
 395                  * and ignore any that weren't present in our earlier
 396                  * traversal.
 397                  */
 398                 for_each_loose_object(mark_loose_unreachable_referents, NULL, 0);
 399                 for_each_packed_object(mark_packed_unreachable_referents, NULL, 0);
 400         }
 401
 402         /* Look up all the requirements, warn about missing objects.. */
 403         max = get_max_object_index();
 404         if (verbose)
 405                 fprintf_ln(stderr, _("Checking connectivity (%d objects)"), max);
 406
 407         for (i = 0; i < max; i++) {
 408                 struct object *obj = get_indexed_object(i);
 409
 410                 if (obj)
 411                         check_object(obj);
 412         }
 413 }
 414
 415 static int fsck_obj(struct object *obj, void *buffer, unsigned long size)
 416 {
 417         int err;
 418
 419         if (obj->flags & SEEN)
 420                 return 0;
 421         obj->flags |= SEEN;
 422
 423         if (verbose)
 424                 fprintf_ln(stderr, _("Checking %s %s"),
 425                            printable_type(&obj->oid, obj->type),
 426                            describe_object(&obj->oid));
 427
 428         if (fsck_walk(obj, NULL, &fsck_obj_options))
 429                 objerror(obj, _("broken links"));
 430         err = fsck_object(obj, buffer, size, &fsck_obj_options);
 431         if (err)
 432                 goto out;
 433
 434         if (obj->type == OBJ_COMMIT) {
 435                 struct commit *commit = (struct commit *) obj;
 436
 437                 if (!commit->parents && show_root)
 438                         printf_ln(_("root %s"),
 439                                   describe_object(&commit->object.oid));
 440         }
 441
 442         if (obj->type == OBJ_TAG) {
 443                 struct tag *tag = (struct tag *) obj;
 444
 445                 if (show_tags && tag->tagged) {
 446                         printf_ln(_("tagged %s %s (%s) in %s"),
 447                                   printable_type(&tag->tagged->oid, tag->tagged->type),
 448                                   describe_object(&tag->tagged->oid),
 449                                   tag->tag,
 450                                   describe_object(&tag->object.oid));
 451                 }
 452         }
 453
 454 out:
 455         if (obj->type == OBJ_TREE)
 456                 free_tree_buffer((struct tree *)obj);
 457         if (obj->type == OBJ_COMMIT)
 458                 free_commit_buffer(the_repository->parsed_objects,
 459                                    (struct commit *)obj);
 460         return err;
 461 }
 462
 463 static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
 464                            unsigned long size, void *buffer, int *eaten)
 465 {
 466         /*
 467          * Note, buffer may be NULL if type is OBJ_BLOB. See
 468          * verify_packfile(), data_valid variable for details.
 469          */
 470         struct object *obj;
 471         obj = parse_object_buffer(the_repository, oid, type, size, buffer,
 472                                   eaten);
 473         if (!obj) {
 474                 errors_found |= ERROR_OBJECT;
 475                 return error(_("%s: object corrupt or missing"),
 476                              oid_to_hex(oid));
 477         }
 478         obj->flags &= ~(REACHABLE | SEEN);
 479         obj->flags |= HAS_OBJ;
 480         return fsck_obj(obj, buffer, size);
 481 }
 482
 483 static int default_refs;
 484
 485 static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
 486         timestamp_t timestamp)
 487 {
 488         struct object *obj;
 489
 490         if (!is_null_oid(oid)) {
 491                 obj = lookup_object(the_repository, oid);
 492                 if (obj && (obj->flags & HAS_OBJ)) {
 493                         if (timestamp)
 494                                 fsck_put_object_name(&fsck_walk_options, oid,
 495                                                      "%s@{%"PRItime"}",
 496                                                      refname, timestamp);
 497                         obj->flags |= USED;
 498                         mark_object_reachable(obj);
 499                 } else if (!is_promisor_object(oid)) {
 500                         error(_("%s: invalid reflog entry %s"),
 501                               refname, oid_to_hex(oid));
 502                         errors_found |= ERROR_REACHABLE;
 503                 }
 504         }
 505 }
 506
 507 static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid,
 508                 const char *email, timestamp_t timestamp, int tz,
 509                 const char *message, void *cb_data)
 510 {
 511         const char *refname = cb_data;
 512
 513         if (verbose)
 514                 fprintf_ln(stderr, _("Checking reflog %s->%s"),
 515                            oid_to_hex(ooid), oid_to_hex(noid));
 516
 517         fsck_handle_reflog_oid(refname, ooid, 0);
 518         fsck_handle_reflog_oid(refname, noid, timestamp);
 519         return 0;
 520 }
 521
 522 static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
 523                               int flag, void *cb_data)
 524 {
 525         struct strbuf refname = STRBUF_INIT;
 526
 527         strbuf_worktree_ref(cb_data, &refname, logname);
 528         for_each_reflog_ent(refname.buf, fsck_handle_reflog_ent, refname.buf);
 529         strbuf_release(&refname);
 530         return 0;
 531 }
 532
 533 static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 534                            int flag, void *cb_data)
 535 {
 536         struct object *obj;
 537
 538         obj = parse_object(the_repository, oid);
 539         if (!obj) {
 540                 if (is_promisor_object(oid)) {
 541                         /*
 542                          * Increment default_refs anyway, because this is a
 543                          * valid ref.
 544                          */
 545                          default_refs++;
 546                          return 0;
 547                 }
 548                 error(_("%s: invalid sha1 pointer %s"),
 549                       refname, oid_to_hex(oid));
 550                 errors_found |= ERROR_REACHABLE;
 551                 /* We'll continue with the rest despite the error.. */
 552                 return 0;
 553         }
 554         if (obj->type != OBJ_COMMIT && is_branch(refname)) {
 555                 error(_("%s: not a commit"), refname);
 556                 errors_found |= ERROR_REFS;
 557         }
 558         default_refs++;
 559         obj->flags |= USED;
 560         fsck_put_object_name(&fsck_walk_options,
 561                              oid, "%s", refname);
 562         mark_object_reachable(obj);
 563
 564         return 0;
 565 }
 566
 567 static int fsck_head_link(const char *head_ref_name,
 568                           const char **head_points_at,
 569                           struct object_id *head_oid);
 570
 571 static void get_default_heads(void)
 572 {
 573         struct worktree **worktrees, **p;
 574         const char *head_points_at;
 575         struct object_id head_oid;
 576
 577         for_each_rawref(fsck_handle_ref, NULL);
 578
 579         worktrees = get_worktrees(0);
 580         for (p = worktrees; *p; p++) {
 581                 struct worktree *wt = *p;
 582                 struct strbuf ref = STRBUF_INIT;
 583
 584                 strbuf_worktree_ref(wt, &ref, "HEAD");
 585                 fsck_head_link(ref.buf, &head_points_at, &head_oid);
 586                 if (head_points_at && !is_null_oid(&head_oid))
 587                         fsck_handle_ref(ref.buf, &head_oid, 0, NULL);
 588                 strbuf_release(&ref);
 589
 590                 if (include_reflogs)
 591                         refs_for_each_reflog(get_worktree_ref_store(wt),
 592                                              fsck_handle_reflog, wt);
 593         }
 594         free_worktrees(worktrees);
 595
 596         /*
 597          * Not having any default heads isn't really fatal, but
 598          * it does mean that "--unreachable" no longer makes any
 599          * sense (since in this case everything will obviously
 600          * be unreachable by definition.
 601          *
 602          * Showing dangling objects is valid, though (as those
 603          * dangling objects are likely lost heads).
 604          *
 605          * So we just print a warning about it, and clear the
 606          * "show_unreachable" flag.
 607          */
 608         if (!default_refs) {
 609                 fprintf_ln(stderr, _("notice: No default references"));
 610                 show_unreachable = 0;
 611         }
 612 }
 613
 614 static int fsck_loose(const struct object_id *oid, const char *path, void *data)
 615 {
 616         struct object *obj;
 617         enum object_type type;
 618         unsigned long size;
 619         void *contents;
 620         int eaten;
 621
 622         if (read_loose_object(path, oid, &type, &size, &contents) < 0) {
 623                 errors_found |= ERROR_OBJECT;
 624                 error(_("%s: object corrupt or missing: %s"),
 625                       oid_to_hex(oid), path);
 626                 return 0; /* keep checking other objects */
 627         }
 628
 629         if (!contents && type != OBJ_BLOB)
 630                 BUG("read_loose_object streamed a non-blob");
 631
 632         obj = parse_object_buffer(the_repository, oid, type, size,
 633                                   contents, &eaten);
 634
 635         if (!obj) {
 636                 errors_found |= ERROR_OBJECT;
 637                 error(_("%s: object could not be parsed: %s"),
 638                       oid_to_hex(oid), path);
 639                 if (!eaten)
 640                         free(contents);
 641                 return 0; /* keep checking other objects */
 642         }
 643
 644         obj->flags &= ~(REACHABLE | SEEN);
 645         obj->flags |= HAS_OBJ;
 646         if (fsck_obj(obj, contents, size))
 647                 errors_found |= ERROR_OBJECT;
 648
 649         if (!eaten)
 650                 free(contents);
 651         return 0; /* keep checking other objects, even if we saw an error */
 652 }
 653
 654 static int fsck_cruft(const char *basename, const char *path, void *data)
 655 {
 656         if (!starts_with(basename, "tmp_obj_"))
 657                 fprintf_ln(stderr, _("bad sha1 file: %s"), path);
 658         return 0;
 659 }
 660
 661 static int fsck_subdir(unsigned int nr, const char *path, void *progress)
 662 {
 663         display_progress(progress, nr + 1);
 664         return 0;
 665 }
 666
 667 static void fsck_object_dir(const char *path)
 668 {
 669         struct progress *progress = NULL;
 670
 671         if (verbose)
 672                 fprintf_ln(stderr, _("Checking object directory"));
 673
 674         if (show_progress)
 675                 progress = start_progress(_("Checking object directories"), 256);
 676
 677         for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
 678                                       progress);
 679         display_progress(progress, 256);
 680         stop_progress(&progress);
 681 }
 682
 683 static int fsck_head_link(const char *head_ref_name,
 684                           const char **head_points_at,
 685                           struct object_id *head_oid)
 686 {
 687         int null_is_error = 0;
 688
 689         if (verbose)
 690                 fprintf_ln(stderr, _("Checking %s link"), head_ref_name);
 691
 692         *head_points_at = resolve_ref_unsafe(head_ref_name, 0, head_oid, NULL);
 693         if (!*head_points_at) {
 694                 errors_found |= ERROR_REFS;
 695                 return error(_("invalid %s"), head_ref_name);
 696         }
 697         if (!strcmp(*head_points_at, head_ref_name))
 698                 /* detached HEAD */
 699                 null_is_error = 1;
 700         else if (!starts_with(*head_points_at, "refs/heads/")) {
 701                 errors_found |= ERROR_REFS;
 702                 return error(_("%s points to something strange (%s)"),
 703                              head_ref_name, *head_points_at);
 704         }
 705         if (is_null_oid(head_oid)) {
 706                 if (null_is_error) {
 707                         errors_found |= ERROR_REFS;
 708                         return error(_("%s: detached HEAD points at nothing"),
 709                                      head_ref_name);
 710                 }
 711                 fprintf_ln(stderr,
 712                            _("notice: %s points to an unborn branch (%s)"),
 713                            head_ref_name, *head_points_at + 11);
 714         }
 715         return 0;
 716 }
 717
 718 static int fsck_cache_tree(struct cache_tree *it)
 719 {
 720         int i;
 721         int err = 0;
 722
 723         if (verbose)
 724                 fprintf_ln(stderr, _("Checking cache tree"));
 725
 726         if (0 <= it->entry_count) {
 727                 struct object *obj = parse_object(the_repository, &it->oid);
 728                 if (!obj) {
 729                         error(_("%s: invalid sha1 pointer in cache-tree"),
 730                               oid_to_hex(&it->oid));
 731                         errors_found |= ERROR_REFS;
 732                         return 1;
 733                 }
 734                 obj->flags |= USED;
 735                 fsck_put_object_name(&fsck_walk_options, &it->oid, ":");
 736                 mark_object_reachable(obj);
 737                 if (obj->type != OBJ_TREE)
 738                         err |= objerror(obj, _("non-tree in cache-tree"));
 739         }
 740         for (i = 0; i < it->subtree_nr; i++)
 741                 err |= fsck_cache_tree(it->down[i]->cache_tree);
 742         return err;
 743 }
 744
 745 static void mark_object_for_connectivity(const struct object_id *oid)
 746 {
 747         struct object *obj = lookup_unknown_object(oid);
 748         obj->flags |= HAS_OBJ;
 749 }
 750
 751 static int mark_loose_for_connectivity(const struct object_id *oid,
 752                                        const char *path,
 753                                        void *data)
 754 {
 755         mark_object_for_connectivity(oid);
 756         return 0;
 757 }
 758
 759 static int mark_packed_for_connectivity(const struct object_id *oid,
 760                                         struct packed_git *pack,
 761                                         uint32_t pos,
 762                                         void *data)
 763 {
 764         mark_object_for_connectivity(oid);
 765         return 0;
 766 }
 767
 768 static char const * const fsck_usage[] = {
 769         N_("git fsck [<options>] [<object>...]"),
 770         NULL
 771 };
 772
 773 static struct option fsck_opts[] = {
 774         OPT__VERBOSE(&verbose, N_("be verbose")),
 775         OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
 776         OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
 777         OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
 778         OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
 779         OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
 780         OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
 781         OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
 782         OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
 783         OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
 784         OPT_BOOL(0, "lost-found", &write_lost_and_found,
 785                                 N_("write dangling objects in .git/lost-found")),
 786         OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 787         OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
 788         OPT_END(),
 789 };
 790
 791 int cmd_fsck(int argc, const char **argv, const char *prefix)
 792 {
 793         int i;
 794         struct object_directory *odb;
 795
 796         /* fsck knows how to handle missing promisor objects */
 797         fetch_if_missing = 0;
 798
 799         errors_found = 0;
 800         read_replace_refs = 0;
 801
 802         argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 803
 804         fsck_walk_options.walk = mark_object;
 805         fsck_obj_options.walk = mark_used;
 806         fsck_obj_options.error_func = fsck_error_func;
 807         if (check_strict)
 808                 fsck_obj_options.strict = 1;
 809
 810         if (show_progress == -1)
 811                 show_progress = isatty(2);
 812         if (verbose)
 813                 show_progress = 0;
 814
 815         if (write_lost_and_found) {
 816                 check_full = 1;
 817                 include_reflogs = 0;
 818         }
 819
 820         if (name_objects)
 821                 fsck_enable_object_names(&fsck_walk_options);
 822
 823         git_config(fsck_config, NULL);
 824
 825         if (connectivity_only) {
 826                 for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
 827                 for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
 828         } else {
 829                 prepare_alt_odb(the_repository);
 830                 for (odb = the_repository->objects->odb; odb; odb = odb->next)
 831                         fsck_object_dir(odb->path);
 832
 833                 if (check_full) {
 834                         struct packed_git *p;
 835                         uint32_t total = 0, count = 0;
 836                         struct progress *progress = NULL;
 837
 838                         if (show_progress) {
 839                                 for (p = get_all_packs(the_repository); p;
 840                                      p = p->next) {
 841                                         if (open_pack_index(p))
 842                                                 continue;
 843                                         total += p->num_objects;
 844                                 }
 845
 846                                 progress = start_progress(_("Checking objects"), total);
 847                         }
 848                         for (p = get_all_packs(the_repository); p;
 849                              p = p->next) {
 850                                 /* verify gives error messages itself */
 851                                 if (verify_pack(the_repository,
 852                                                 p, fsck_obj_buffer,
 853                                                 progress, count))
 854                                         errors_found |= ERROR_PACK;
 855                                 count += p->num_objects;
 856                         }
 857                         stop_progress(&progress);
 858                 }
 859
 860                 if (fsck_finish(&fsck_obj_options))
 861                         errors_found |= ERROR_OBJECT;
 862         }
 863
 864         for (i = 0; i < argc; i++) {
 865                 const char *arg = argv[i];
 866                 struct object_id oid;
 867                 if (!get_oid(arg, &oid)) {
 868                         struct object *obj = lookup_object(the_repository,
 869                                                            &oid);
 870
 871                         if (!obj || !(obj->flags & HAS_OBJ)) {
 872                                 if (is_promisor_object(&oid))
 873                                         continue;
 874                                 error(_("%s: object missing"), oid_to_hex(&oid));
 875                                 errors_found |= ERROR_OBJECT;
 876                                 continue;
 877                         }
 878
 879                         obj->flags |= USED;
 880                         fsck_put_object_name(&fsck_walk_options, &oid,
 881                                              "%s", arg);
 882                         mark_object_reachable(obj);
 883                         continue;
 884                 }
 885                 error(_("invalid parameter: expected sha1, got '%s'"), arg);
 886                 errors_found |= ERROR_OBJECT;
 887         }
 888
 889         /*
 890          * If we've not been given any explicit head information, do the
 891          * default ones from .git/refs. We also consider the index file
 892          * in this case (ie this implies --cache).
 893          */
 894         if (!argc) {
 895                 get_default_heads();
 896                 keep_cache_objects = 1;
 897         }
 898
 899         if (keep_cache_objects) {
 900                 verify_index_checksum = 1;
 901                 verify_ce_order = 1;
 902                 read_cache();
 903                 for (i = 0; i < active_nr; i++) {
 904                         unsigned int mode;
 905                         struct blob *blob;
 906                         struct object *obj;
 907
 908                         mode = active_cache[i]->ce_mode;
 909                         if (S_ISGITLINK(mode))
 910                                 continue;
 911                         blob = lookup_blob(the_repository,
 912                                            &active_cache[i]->oid);
 913                         if (!blob)
 914                                 continue;
 915                         obj = &blob->object;
 916                         obj->flags |= USED;
 917                         fsck_put_object_name(&fsck_walk_options, &obj->oid,
 918                                              ":%s", active_cache[i]->name);
 919                         mark_object_reachable(obj);
 920                 }
 921                 if (active_cache_tree)
 922                         fsck_cache_tree(active_cache_tree);
 923         }
 924
 925         check_connectivity();
 926
 927         if (!git_config_get_bool("core.commitgraph", &i) && i) {
 928                 struct child_process commit_graph_verify = CHILD_PROCESS_INIT;
 929                 const char *verify_argv[] = { "commit-graph", "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(&commit_graph_verify);
 934                         commit_graph_verify.argv = verify_argv;
 935                         commit_graph_verify.git_cmd = 1;
 936                         verify_argv[2] = "--object-dir";
 937                         verify_argv[3] = odb->path;
 938                         if (run_command(&commit_graph_verify))
 939                                 errors_found |= ERROR_COMMIT_GRAPH;
 940                 }
 941         }
 942
 943         if (!git_config_get_bool("core.multipackindex", &i) && i) {
 944                 struct child_process midx_verify = CHILD_PROCESS_INIT;
 945                 const char *midx_argv[] = { "multi-pack-index", "verify", NULL, NULL, NULL };
 946
 947                 prepare_alt_odb(the_repository);
 948                 for (odb = the_repository->objects->odb; odb; odb = odb->next) {
 949                         child_process_init(&midx_verify);
 950                         midx_verify.argv = midx_argv;
 951                         midx_verify.git_cmd = 1;
 952                         midx_argv[2] = "--object-dir";
 953                         midx_argv[3] = odb->path;
 954                         if (run_command(&midx_verify))
 955                                 errors_found |= ERROR_COMMIT_GRAPH;
 956                 }
 957         }
 958
 959         return errors_found;
 960 }