builtin / fsck.con commit wt-status.h: drop stdio.h include (7a06fb0)
   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
  31static int show_root;
  32static int show_tags;
  33static int show_unreachable;
  34static int include_reflogs = 1;
  35static int check_full = 1;
  36static int connectivity_only;
  37static int check_strict;
  38static int keep_cache_objects;
  39static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
  40static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
  41static int errors_found;
  42static int write_lost_and_found;
  43static int verbose;
  44static int show_progress = -1;
  45static int show_dangling = 1;
  46static 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
  53static const char *describe_object(struct object *obj)
  54{
  55        static struct strbuf bufs[] = {
  56                STRBUF_INIT, STRBUF_INIT, STRBUF_INIT, STRBUF_INIT
  57        };
  58        static int b = 0;
  59        struct strbuf *buf;
  60        char *name = NULL;
  61
  62        if (name_objects)
  63                name = lookup_decoration(fsck_walk_options.object_names, obj);
  64
  65        buf = bufs + b;
  66        b = (b + 1) % ARRAY_SIZE(bufs);
  67        strbuf_reset(buf);
  68        strbuf_addstr(buf, oid_to_hex(&obj->oid));
  69        if (name)
  70                strbuf_addf(buf, " (%s)", name);
  71
  72        return buf->buf;
  73}
  74
  75static const char *printable_type(struct object *obj)
  76{
  77        const char *ret;
  78
  79        if (obj->type == OBJ_NONE) {
  80                enum object_type type = oid_object_info(the_repository,
  81                                                        &obj->oid, NULL);
  82                if (type > 0)
  83                        object_as_type(the_repository, obj, type, 0);
  84        }
  85
  86        ret = type_name(obj->type);
  87        if (!ret)
  88                ret = _("unknown");
  89
  90        return ret;
  91}
  92
  93static int fsck_config(const char *var, const char *value, void *cb)
  94{
  95        if (strcmp(var, "fsck.skiplist") == 0) {
  96                const char *path;
  97                struct strbuf sb = STRBUF_INIT;
  98
  99                if (git_config_pathname(&path, var, value))
 100                        return 1;
 101                strbuf_addf(&sb, "skiplist=%s", path);
 102                free((char *)path);
 103                fsck_set_msg_types(&fsck_obj_options, sb.buf);
 104                strbuf_release(&sb);
 105                return 0;
 106        }
 107
 108        if (skip_prefix(var, "fsck.", &var)) {
 109                fsck_set_msg_type(&fsck_obj_options, var, value);
 110                return 0;
 111        }
 112
 113        return git_default_config(var, value, cb);
 114}
 115
 116static int objerror(struct object *obj, const char *err)
 117{
 118        errors_found |= ERROR_OBJECT;
 119        /* TRANSLATORS: e.g. error in tree 01bfda: <more explanation> */
 120        fprintf_ln(stderr, _("error in %s %s: %s"),
 121                   printable_type(obj), describe_object(obj), err);
 122        return -1;
 123}
 124
 125static int fsck_error_func(struct fsck_options *o,
 126        struct object *obj, int type, const char *message)
 127{
 128        switch (type) {
 129        case FSCK_WARN:
 130                /* TRANSLATORS: e.g. warning in tree 01bfda: <more explanation> */
 131                fprintf_ln(stderr, _("warning in %s %s: %s"),
 132                           printable_type(obj), describe_object(obj), message);
 133                return 0;
 134        case FSCK_ERROR:
 135                /* TRANSLATORS: e.g. error in tree 01bfda: <more explanation> */
 136                fprintf_ln(stderr, _("error in %s %s: %s"),
 137                           printable_type(obj), describe_object(obj), message);
 138                return 1;
 139        default:
 140                BUG("%d (FSCK_IGNORE?) should never trigger this callback", type);
 141        }
 142}
 143
 144static struct object_array pending;
 145
 146static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
 147{
 148        struct object *parent = data;
 149
 150        /*
 151         * The only case data is NULL or type is OBJ_ANY is when
 152         * mark_object_reachable() calls us.  All the callers of
 153         * that function has non-NULL obj hence ...
 154         */
 155        if (!obj) {
 156                /* ... these references to parent->fld are safe here */
 157                printf_ln(_("broken link from %7s %s"),
 158                          printable_type(parent), describe_object(parent));
 159                printf_ln(_("broken link from %7s %s"),
 160                          (type == OBJ_ANY ? _("unknown") : type_name(type)),
 161                          _("unknown"));
 162                errors_found |= ERROR_REACHABLE;
 163                return 1;
 164        }
 165
 166        if (type != OBJ_ANY && obj->type != type)
 167                /* ... and the reference to parent is safe here */
 168                objerror(parent, _("wrong object type in link"));
 169
 170        if (obj->flags & REACHABLE)
 171                return 0;
 172        obj->flags |= REACHABLE;
 173
 174        if (is_promisor_object(&obj->oid))
 175                /*
 176                 * Further recursion does not need to be performed on this
 177                 * object since it is a promisor object (so it does not need to
 178                 * be added to "pending").
 179                 */
 180                return 0;
 181
 182        if (!(obj->flags & HAS_OBJ)) {
 183                if (parent && !has_object_file(&obj->oid)) {
 184                        printf_ln(_("broken link from %7s %s\n"
 185                                    "              to %7s %s"),
 186                                  printable_type(parent),
 187                                  describe_object(parent),
 188                                  printable_type(obj),
 189                                  describe_object(obj));
 190                        errors_found |= ERROR_REACHABLE;
 191                }
 192                return 1;
 193        }
 194
 195        add_object_array(obj, NULL, &pending);
 196        return 0;
 197}
 198
 199static void mark_object_reachable(struct object *obj)
 200{
 201        mark_object(obj, OBJ_ANY, NULL, NULL);
 202}
 203
 204static int traverse_one_object(struct object *obj)
 205{
 206        int result = fsck_walk(obj, obj, &fsck_walk_options);
 207
 208        if (obj->type == OBJ_TREE) {
 209                struct tree *tree = (struct tree *)obj;
 210                free_tree_buffer(tree);
 211        }
 212        return result;
 213}
 214
 215static int traverse_reachable(void)
 216{
 217        struct progress *progress = NULL;
 218        unsigned int nr = 0;
 219        int result = 0;
 220        if (show_progress)
 221                progress = start_delayed_progress(_("Checking connectivity"), 0);
 222        while (pending.nr) {
 223                result |= traverse_one_object(object_array_pop(&pending));
 224                display_progress(progress, ++nr);
 225        }
 226        stop_progress(&progress);
 227        return !!result;
 228}
 229
 230static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
 231{
 232        if (!obj)
 233                return 1;
 234        obj->flags |= USED;
 235        return 0;
 236}
 237
 238static void mark_unreachable_referents(const struct object_id *oid)
 239{
 240        struct fsck_options options = FSCK_OPTIONS_DEFAULT;
 241        struct object *obj = lookup_object(the_repository, oid->hash);
 242
 243        if (!obj || !(obj->flags & HAS_OBJ))
 244                return; /* not part of our original set */
 245        if (obj->flags & REACHABLE)
 246                return; /* reachable objects already traversed */
 247
 248        /*
 249         * Avoid passing OBJ_NONE to fsck_walk, which will parse the object
 250         * (and we want to avoid parsing blobs).
 251         */
 252        if (obj->type == OBJ_NONE) {
 253                enum object_type type = oid_object_info(the_repository,
 254                                                        &obj->oid, NULL);
 255                if (type > 0)
 256                        object_as_type(the_repository, obj, type, 0);
 257        }
 258
 259        options.walk = mark_used;
 260        fsck_walk(obj, NULL, &options);
 261}
 262
 263static int mark_loose_unreachable_referents(const struct object_id *oid,
 264                                            const char *path,
 265                                            void *data)
 266{
 267        mark_unreachable_referents(oid);
 268        return 0;
 269}
 270
 271static int mark_packed_unreachable_referents(const struct object_id *oid,
 272                                             struct packed_git *pack,
 273                                             uint32_t pos,
 274                                             void *data)
 275{
 276        mark_unreachable_referents(oid);
 277        return 0;
 278}
 279
 280/*
 281 * Check a single reachable object
 282 */
 283static void check_reachable_object(struct object *obj)
 284{
 285        /*
 286         * We obviously want the object to be parsed,
 287         * except if it was in a pack-file and we didn't
 288         * do a full fsck
 289         */
 290        if (!(obj->flags & HAS_OBJ)) {
 291                if (is_promisor_object(&obj->oid))
 292                        return;
 293                if (has_object_pack(&obj->oid))
 294                        return; /* it is in pack - forget about it */
 295                printf_ln(_("missing %s %s"), printable_type(obj),
 296                          describe_object(obj));
 297                errors_found |= ERROR_REACHABLE;
 298                return;
 299        }
 300}
 301
 302/*
 303 * Check a single unreachable object
 304 */
 305static void check_unreachable_object(struct object *obj)
 306{
 307        /*
 308         * Missing unreachable object? Ignore it. It's not like
 309         * we miss it (since it can't be reached), nor do we want
 310         * to complain about it being unreachable (since it does
 311         * not exist).
 312         */
 313        if (!(obj->flags & HAS_OBJ))
 314                return;
 315
 316        /*
 317         * Unreachable object that exists? Show it if asked to,
 318         * since this is something that is prunable.
 319         */
 320        if (show_unreachable) {
 321                printf_ln(_("unreachable %s %s"), printable_type(obj),
 322                          describe_object(obj));
 323                return;
 324        }
 325
 326        /*
 327         * "!USED" means that nothing at all points to it, including
 328         * other unreachable objects. In other words, it's the "tip"
 329         * of some set of unreachable objects, usually a commit that
 330         * got dropped.
 331         *
 332         * Such starting points are more interesting than some random
 333         * set of unreachable objects, so we show them even if the user
 334         * hasn't asked for _all_ unreachable objects. If you have
 335         * deleted a branch by mistake, this is a prime candidate to
 336         * start looking at, for example.
 337         */
 338        if (!(obj->flags & USED)) {
 339                if (show_dangling)
 340                        printf_ln(_("dangling %s %s"), printable_type(obj),
 341                                  describe_object(obj));
 342                if (write_lost_and_found) {
 343                        char *filename = git_pathdup("lost-found/%s/%s",
 344                                obj->type == OBJ_COMMIT ? "commit" : "other",
 345                                describe_object(obj));
 346                        FILE *f;
 347
 348                        if (safe_create_leading_directories_const(filename)) {
 349                                error(_("could not create lost-found"));
 350                                free(filename);
 351                                return;
 352                        }
 353                        f = xfopen(filename, "w");
 354                        if (obj->type == OBJ_BLOB) {
 355                                if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
 356                                        die_errno(_("could not write '%s'"), filename);
 357                        } else
 358                                fprintf(f, "%s\n", describe_object(obj));
 359                        if (fclose(f))
 360                                die_errno(_("could not finish '%s'"),
 361                                          filename);
 362                        free(filename);
 363                }
 364                return;
 365        }
 366
 367        /*
 368         * Otherwise? It's there, it's unreachable, and some other unreachable
 369         * object points to it. Ignore it - it's not interesting, and we showed
 370         * all the interesting cases above.
 371         */
 372}
 373
 374static void check_object(struct object *obj)
 375{
 376        if (verbose)
 377                fprintf_ln(stderr, _("Checking %s"), describe_object(obj));
 378
 379        if (obj->flags & REACHABLE)
 380                check_reachable_object(obj);
 381        else
 382                check_unreachable_object(obj);
 383}
 384
 385static void check_connectivity(void)
 386{
 387        int i, max;
 388
 389        /* Traverse the pending reachable objects */
 390        traverse_reachable();
 391
 392        /*
 393         * With --connectivity-only, we won't have actually opened and marked
 394         * unreachable objects with USED. Do that now to make --dangling, etc
 395         * accurate.
 396         */
 397        if (connectivity_only && (show_dangling || write_lost_and_found)) {
 398                /*
 399                 * Even though we already have a "struct object" for each of
 400                 * these in memory, we must not iterate over the internal
 401                 * object hash as we do below. Our loop would potentially
 402                 * resize the hash, making our iteration invalid.
 403                 *
 404                 * Instead, we'll just go back to the source list of objects,
 405                 * and ignore any that weren't present in our earlier
 406                 * traversal.
 407                 */
 408                for_each_loose_object(mark_loose_unreachable_referents, NULL, 0);
 409                for_each_packed_object(mark_packed_unreachable_referents, NULL, 0);
 410        }
 411
 412        /* Look up all the requirements, warn about missing objects.. */
 413        max = get_max_object_index();
 414        if (verbose)
 415                fprintf_ln(stderr, _("Checking connectivity (%d objects)"), max);
 416
 417        for (i = 0; i < max; i++) {
 418                struct object *obj = get_indexed_object(i);
 419
 420                if (obj)
 421                        check_object(obj);
 422        }
 423}
 424
 425static int fsck_obj(struct object *obj, void *buffer, unsigned long size)
 426{
 427        int err;
 428
 429        if (obj->flags & SEEN)
 430                return 0;
 431        obj->flags |= SEEN;
 432
 433        if (verbose)
 434                fprintf_ln(stderr, _("Checking %s %s"),
 435                           printable_type(obj), describe_object(obj));
 436
 437        if (fsck_walk(obj, NULL, &fsck_obj_options))
 438                objerror(obj, _("broken links"));
 439        err = fsck_object(obj, buffer, size, &fsck_obj_options);
 440        if (err)
 441                goto out;
 442
 443        if (obj->type == OBJ_COMMIT) {
 444                struct commit *commit = (struct commit *) obj;
 445
 446                if (!commit->parents && show_root)
 447                        printf_ln(_("root %s"),
 448                                  describe_object(&commit->object));
 449        }
 450
 451        if (obj->type == OBJ_TAG) {
 452                struct tag *tag = (struct tag *) obj;
 453
 454                if (show_tags && tag->tagged) {
 455                        printf_ln(_("tagged %s %s (%s) in %s"),
 456                                  printable_type(tag->tagged),
 457                                  describe_object(tag->tagged),
 458                                  tag->tag,
 459                                  describe_object(&tag->object));
 460                }
 461        }
 462
 463out:
 464        if (obj->type == OBJ_TREE)
 465                free_tree_buffer((struct tree *)obj);
 466        if (obj->type == OBJ_COMMIT)
 467                free_commit_buffer(the_repository->parsed_objects,
 468                                   (struct commit *)obj);
 469        return err;
 470}
 471
 472static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
 473                           unsigned long size, void *buffer, int *eaten)
 474{
 475        /*
 476         * Note, buffer may be NULL if type is OBJ_BLOB. See
 477         * verify_packfile(), data_valid variable for details.
 478         */
 479        struct object *obj;
 480        obj = parse_object_buffer(the_repository, oid, type, size, buffer,
 481                                  eaten);
 482        if (!obj) {
 483                errors_found |= ERROR_OBJECT;
 484                return error(_("%s: object corrupt or missing"),
 485                             oid_to_hex(oid));
 486        }
 487        obj->flags &= ~(REACHABLE | SEEN);
 488        obj->flags |= HAS_OBJ;
 489        return fsck_obj(obj, buffer, size);
 490}
 491
 492static int default_refs;
 493
 494static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
 495        timestamp_t timestamp)
 496{
 497        struct object *obj;
 498
 499        if (!is_null_oid(oid)) {
 500                obj = lookup_object(the_repository, oid->hash);
 501                if (obj && (obj->flags & HAS_OBJ)) {
 502                        if (timestamp && name_objects)
 503                                add_decoration(fsck_walk_options.object_names,
 504                                        obj,
 505                                        xstrfmt("%s@{%"PRItime"}", refname, timestamp));
 506                        obj->flags |= USED;
 507                        mark_object_reachable(obj);
 508                } else if (!is_promisor_object(oid)) {
 509                        error(_("%s: invalid reflog entry %s"),
 510                              refname, oid_to_hex(oid));
 511                        errors_found |= ERROR_REACHABLE;
 512                }
 513        }
 514}
 515
 516static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid,
 517                const char *email, timestamp_t timestamp, int tz,
 518                const char *message, void *cb_data)
 519{
 520        const char *refname = cb_data;
 521
 522        if (verbose)
 523                fprintf_ln(stderr, _("Checking reflog %s->%s"),
 524                           oid_to_hex(ooid), oid_to_hex(noid));
 525
 526        fsck_handle_reflog_oid(refname, ooid, 0);
 527        fsck_handle_reflog_oid(refname, noid, timestamp);
 528        return 0;
 529}
 530
 531static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
 532                              int flag, void *cb_data)
 533{
 534        struct strbuf refname = STRBUF_INIT;
 535
 536        strbuf_worktree_ref(cb_data, &refname, logname);
 537        for_each_reflog_ent(refname.buf, fsck_handle_reflog_ent, refname.buf);
 538        strbuf_release(&refname);
 539        return 0;
 540}
 541
 542static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 543                           int flag, void *cb_data)
 544{
 545        struct object *obj;
 546
 547        obj = parse_object(the_repository, oid);
 548        if (!obj) {
 549                if (is_promisor_object(oid)) {
 550                        /*
 551                         * Increment default_refs anyway, because this is a
 552                         * valid ref.
 553                         */
 554                         default_refs++;
 555                         return 0;
 556                }
 557                error(_("%s: invalid sha1 pointer %s"),
 558                      refname, oid_to_hex(oid));
 559                errors_found |= ERROR_REACHABLE;
 560                /* We'll continue with the rest despite the error.. */
 561                return 0;
 562        }
 563        if (obj->type != OBJ_COMMIT && is_branch(refname)) {
 564                error(_("%s: not a commit"), refname);
 565                errors_found |= ERROR_REFS;
 566        }
 567        default_refs++;
 568        obj->flags |= USED;
 569        if (name_objects)
 570                add_decoration(fsck_walk_options.object_names,
 571                        obj, xstrdup(refname));
 572        mark_object_reachable(obj);
 573
 574        return 0;
 575}
 576
 577static int fsck_head_link(const char *head_ref_name,
 578                          const char **head_points_at,
 579                          struct object_id *head_oid);
 580
 581static void get_default_heads(void)
 582{
 583        struct worktree **worktrees, **p;
 584        const char *head_points_at;
 585        struct object_id head_oid;
 586
 587        for_each_rawref(fsck_handle_ref, NULL);
 588
 589        worktrees = get_worktrees(0);
 590        for (p = worktrees; *p; p++) {
 591                struct worktree *wt = *p;
 592                struct strbuf ref = STRBUF_INIT;
 593
 594                strbuf_worktree_ref(wt, &ref, "HEAD");
 595                fsck_head_link(ref.buf, &head_points_at, &head_oid);
 596                if (head_points_at && !is_null_oid(&head_oid))
 597                        fsck_handle_ref(ref.buf, &head_oid, 0, NULL);
 598                strbuf_release(&ref);
 599
 600                if (include_reflogs)
 601                        refs_for_each_reflog(get_worktree_ref_store(wt),
 602                                             fsck_handle_reflog, wt);
 603        }
 604        free_worktrees(worktrees);
 605
 606        /*
 607         * Not having any default heads isn't really fatal, but
 608         * it does mean that "--unreachable" no longer makes any
 609         * sense (since in this case everything will obviously
 610         * be unreachable by definition.
 611         *
 612         * Showing dangling objects is valid, though (as those
 613         * dangling objects are likely lost heads).
 614         *
 615         * So we just print a warning about it, and clear the
 616         * "show_unreachable" flag.
 617         */
 618        if (!default_refs) {
 619                fprintf_ln(stderr, _("notice: No default references"));
 620                show_unreachable = 0;
 621        }
 622}
 623
 624static int fsck_loose(const struct object_id *oid, const char *path, void *data)
 625{
 626        struct object *obj;
 627        enum object_type type;
 628        unsigned long size;
 629        void *contents;
 630        int eaten;
 631
 632        if (read_loose_object(path, oid, &type, &size, &contents) < 0) {
 633                errors_found |= ERROR_OBJECT;
 634                error(_("%s: object corrupt or missing: %s"),
 635                      oid_to_hex(oid), path);
 636                return 0; /* keep checking other objects */
 637        }
 638
 639        if (!contents && type != OBJ_BLOB)
 640                BUG("read_loose_object streamed a non-blob");
 641
 642        obj = parse_object_buffer(the_repository, oid, type, size,
 643                                  contents, &eaten);
 644
 645        if (!obj) {
 646                errors_found |= ERROR_OBJECT;
 647                error(_("%s: object could not be parsed: %s"),
 648                      oid_to_hex(oid), path);
 649                if (!eaten)
 650                        free(contents);
 651                return 0; /* keep checking other objects */
 652        }
 653
 654        obj->flags &= ~(REACHABLE | SEEN);
 655        obj->flags |= HAS_OBJ;
 656        if (fsck_obj(obj, contents, size))
 657                errors_found |= ERROR_OBJECT;
 658
 659        if (!eaten)
 660                free(contents);
 661        return 0; /* keep checking other objects, even if we saw an error */
 662}
 663
 664static int fsck_cruft(const char *basename, const char *path, void *data)
 665{
 666        if (!starts_with(basename, "tmp_obj_"))
 667                fprintf_ln(stderr, _("bad sha1 file: %s"), path);
 668        return 0;
 669}
 670
 671static int fsck_subdir(unsigned int nr, const char *path, void *progress)
 672{
 673        display_progress(progress, nr + 1);
 674        return 0;
 675}
 676
 677static void fsck_object_dir(const char *path)
 678{
 679        struct progress *progress = NULL;
 680
 681        if (verbose)
 682                fprintf_ln(stderr, _("Checking object directory"));
 683
 684        if (show_progress)
 685                progress = start_progress(_("Checking object directories"), 256);
 686
 687        for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
 688                                      progress);
 689        display_progress(progress, 256);
 690        stop_progress(&progress);
 691}
 692
 693static int fsck_head_link(const char *head_ref_name,
 694                          const char **head_points_at,
 695                          struct object_id *head_oid)
 696{
 697        int null_is_error = 0;
 698
 699        if (verbose)
 700                fprintf_ln(stderr, _("Checking %s link"), head_ref_name);
 701
 702        *head_points_at = resolve_ref_unsafe(head_ref_name, 0, head_oid, NULL);
 703        if (!*head_points_at) {
 704                errors_found |= ERROR_REFS;
 705                return error(_("invalid %s"), head_ref_name);
 706        }
 707        if (!strcmp(*head_points_at, head_ref_name))
 708                /* detached HEAD */
 709                null_is_error = 1;
 710        else if (!starts_with(*head_points_at, "refs/heads/")) {
 711                errors_found |= ERROR_REFS;
 712                return error(_("%s points to something strange (%s)"),
 713                             head_ref_name, *head_points_at);
 714        }
 715        if (is_null_oid(head_oid)) {
 716                if (null_is_error) {
 717                        errors_found |= ERROR_REFS;
 718                        return error(_("%s: detached HEAD points at nothing"),
 719                                     head_ref_name);
 720                }
 721                fprintf_ln(stderr,
 722                           _("notice: %s points to an unborn branch (%s)"),
 723                           head_ref_name, *head_points_at + 11);
 724        }
 725        return 0;
 726}
 727
 728static int fsck_cache_tree(struct cache_tree *it)
 729{
 730        int i;
 731        int err = 0;
 732
 733        if (verbose)
 734                fprintf_ln(stderr, _("Checking cache tree"));
 735
 736        if (0 <= it->entry_count) {
 737                struct object *obj = parse_object(the_repository, &it->oid);
 738                if (!obj) {
 739                        error(_("%s: invalid sha1 pointer in cache-tree"),
 740                              oid_to_hex(&it->oid));
 741                        errors_found |= ERROR_REFS;
 742                        return 1;
 743                }
 744                obj->flags |= USED;
 745                if (name_objects)
 746                        add_decoration(fsck_walk_options.object_names,
 747                                obj, xstrdup(":"));
 748                mark_object_reachable(obj);
 749                if (obj->type != OBJ_TREE)
 750                        err |= objerror(obj, _("non-tree in cache-tree"));
 751        }
 752        for (i = 0; i < it->subtree_nr; i++)
 753                err |= fsck_cache_tree(it->down[i]->cache_tree);
 754        return err;
 755}
 756
 757static void mark_object_for_connectivity(const struct object_id *oid)
 758{
 759        struct object *obj = lookup_unknown_object(oid->hash);
 760        obj->flags |= HAS_OBJ;
 761}
 762
 763static int mark_loose_for_connectivity(const struct object_id *oid,
 764                                       const char *path,
 765                                       void *data)
 766{
 767        mark_object_for_connectivity(oid);
 768        return 0;
 769}
 770
 771static int mark_packed_for_connectivity(const struct object_id *oid,
 772                                        struct packed_git *pack,
 773                                        uint32_t pos,
 774                                        void *data)
 775{
 776        mark_object_for_connectivity(oid);
 777        return 0;
 778}
 779
 780static char const * const fsck_usage[] = {
 781        N_("git fsck [<options>] [<object>...]"),
 782        NULL
 783};
 784
 785static struct option fsck_opts[] = {
 786        OPT__VERBOSE(&verbose, N_("be verbose")),
 787        OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
 788        OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
 789        OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
 790        OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
 791        OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
 792        OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
 793        OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
 794        OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
 795        OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
 796        OPT_BOOL(0, "lost-found", &write_lost_and_found,
 797                                N_("write dangling objects in .git/lost-found")),
 798        OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 799        OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
 800        OPT_END(),
 801};
 802
 803int cmd_fsck(int argc, const char **argv, const char *prefix)
 804{
 805        int i;
 806        struct object_directory *odb;
 807
 808        /* fsck knows how to handle missing promisor objects */
 809        fetch_if_missing = 0;
 810
 811        errors_found = 0;
 812        read_replace_refs = 0;
 813
 814        argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 815
 816        fsck_walk_options.walk = mark_object;
 817        fsck_obj_options.walk = mark_used;
 818        fsck_obj_options.error_func = fsck_error_func;
 819        if (check_strict)
 820                fsck_obj_options.strict = 1;
 821
 822        if (show_progress == -1)
 823                show_progress = isatty(2);
 824        if (verbose)
 825                show_progress = 0;
 826
 827        if (write_lost_and_found) {
 828                check_full = 1;
 829                include_reflogs = 0;
 830        }
 831
 832        if (name_objects)
 833                fsck_walk_options.object_names =
 834                        xcalloc(1, sizeof(struct decoration));
 835
 836        git_config(fsck_config, NULL);
 837
 838        if (connectivity_only) {
 839                for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
 840                for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
 841        } else {
 842                prepare_alt_odb(the_repository);
 843                for (odb = the_repository->objects->odb; odb; odb = odb->next)
 844                        fsck_object_dir(odb->path);
 845
 846                if (check_full) {
 847                        struct packed_git *p;
 848                        uint32_t total = 0, count = 0;
 849                        struct progress *progress = NULL;
 850
 851                        if (show_progress) {
 852                                for (p = get_all_packs(the_repository); p;
 853                                     p = p->next) {
 854                                        if (open_pack_index(p))
 855                                                continue;
 856                                        total += p->num_objects;
 857                                }
 858
 859                                progress = start_progress(_("Checking objects"), total);
 860                        }
 861                        for (p = get_all_packs(the_repository); p;
 862                             p = p->next) {
 863                                /* verify gives error messages itself */
 864                                if (verify_pack(the_repository,
 865                                                p, fsck_obj_buffer,
 866                                                progress, count))
 867                                        errors_found |= ERROR_PACK;
 868                                count += p->num_objects;
 869                        }
 870                        stop_progress(&progress);
 871                }
 872
 873                if (fsck_finish(&fsck_obj_options))
 874                        errors_found |= ERROR_OBJECT;
 875        }
 876
 877        for (i = 0; i < argc; i++) {
 878                const char *arg = argv[i];
 879                struct object_id oid;
 880                if (!get_oid(arg, &oid)) {
 881                        struct object *obj = lookup_object(the_repository,
 882                                                           oid.hash);
 883
 884                        if (!obj || !(obj->flags & HAS_OBJ)) {
 885                                if (is_promisor_object(&oid))
 886                                        continue;
 887                                error(_("%s: object missing"), oid_to_hex(&oid));
 888                                errors_found |= ERROR_OBJECT;
 889                                continue;
 890                        }
 891
 892                        obj->flags |= USED;
 893                        if (name_objects)
 894                                add_decoration(fsck_walk_options.object_names,
 895                                        obj, xstrdup(arg));
 896                        mark_object_reachable(obj);
 897                        continue;
 898                }
 899                error(_("invalid parameter: expected sha1, got '%s'"), arg);
 900                errors_found |= ERROR_OBJECT;
 901        }
 902
 903        /*
 904         * If we've not been given any explicit head information, do the
 905         * default ones from .git/refs. We also consider the index file
 906         * in this case (ie this implies --cache).
 907         */
 908        if (!argc) {
 909                get_default_heads();
 910                keep_cache_objects = 1;
 911        }
 912
 913        if (keep_cache_objects) {
 914                verify_index_checksum = 1;
 915                verify_ce_order = 1;
 916                read_cache();
 917                for (i = 0; i < active_nr; i++) {
 918                        unsigned int mode;
 919                        struct blob *blob;
 920                        struct object *obj;
 921
 922                        mode = active_cache[i]->ce_mode;
 923                        if (S_ISGITLINK(mode))
 924                                continue;
 925                        blob = lookup_blob(the_repository,
 926                                           &active_cache[i]->oid);
 927                        if (!blob)
 928                                continue;
 929                        obj = &blob->object;
 930                        obj->flags |= USED;
 931                        if (name_objects)
 932                                add_decoration(fsck_walk_options.object_names,
 933                                        obj,
 934                                        xstrfmt(":%s", active_cache[i]->name));
 935                        mark_object_reachable(obj);
 936                }
 937                if (active_cache_tree)
 938                        fsck_cache_tree(active_cache_tree);
 939        }
 940
 941        check_connectivity();
 942
 943        if (!git_config_get_bool("core.commitgraph", &i) && i) {
 944                struct child_process commit_graph_verify = CHILD_PROCESS_INIT;
 945                const char *verify_argv[] = { "commit-graph", "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(&commit_graph_verify);
 950                        commit_graph_verify.argv = verify_argv;
 951                        commit_graph_verify.git_cmd = 1;
 952                        verify_argv[2] = "--object-dir";
 953                        verify_argv[3] = odb->path;
 954                        if (run_command(&commit_graph_verify))
 955                                errors_found |= ERROR_COMMIT_GRAPH;
 956                }
 957        }
 958
 959        if (!git_config_get_bool("core.multipackindex", &i) && i) {
 960                struct child_process midx_verify = CHILD_PROCESS_INIT;
 961                const char *midx_argv[] = { "multi-pack-index", "verify", NULL, NULL, NULL };
 962
 963                prepare_alt_odb(the_repository);
 964                for (odb = the_repository->objects->odb; odb; odb = odb->next) {
 965                        child_process_init(&midx_verify);
 966                        midx_verify.argv = midx_argv;
 967                        midx_verify.git_cmd = 1;
 968                        midx_argv[2] = "--object-dir";
 969                        midx_argv[3] = odb->path;
 970                        if (run_command(&midx_verify))
 971                                errors_found |= ERROR_COMMIT_GRAPH;
 972                }
 973        }
 974
 975        return errors_found;
 976}