builtin / fsck.con commit travis-ci: fix "skip_branch_tip_with_tag()" string comparison (8376eb4)
   1#include "builtin.h"
   2#include "cache.h"
   3#include "config.h"
   4#include "commit.h"
   5#include "tree.h"
   6#include "blob.h"
   7#include "tag.h"
   8#include "refs.h"
   9#include "pack.h"
  10#include "cache-tree.h"
  11#include "tree-walk.h"
  12#include "fsck.h"
  13#include "parse-options.h"
  14#include "dir.h"
  15#include "progress.h"
  16#include "streaming.h"
  17#include "decorate.h"
  18
  19#define REACHABLE 0x0001
  20#define SEEN      0x0002
  21#define HAS_OBJ   0x0004
  22/* This flag is set if something points to this object. */
  23#define USED      0x0008
  24
  25static int show_root;
  26static int show_tags;
  27static int show_unreachable;
  28static int include_reflogs = 1;
  29static int check_full = 1;
  30static int connectivity_only;
  31static int check_strict;
  32static int keep_cache_objects;
  33static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
  34static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
  35static struct object_id head_oid;
  36static const char *head_points_at;
  37static int errors_found;
  38static int write_lost_and_found;
  39static int verbose;
  40static int show_progress = -1;
  41static int show_dangling = 1;
  42static int name_objects;
  43#define ERROR_OBJECT 01
  44#define ERROR_REACHABLE 02
  45#define ERROR_PACK 04
  46#define ERROR_REFS 010
  47
  48static const char *describe_object(struct object *obj)
  49{
  50        static struct strbuf buf = STRBUF_INIT;
  51        char *name = name_objects ?
  52                lookup_decoration(fsck_walk_options.object_names, obj) : NULL;
  53
  54        strbuf_reset(&buf);
  55        strbuf_addstr(&buf, oid_to_hex(&obj->oid));
  56        if (name)
  57                strbuf_addf(&buf, " (%s)", name);
  58
  59        return buf.buf;
  60}
  61
  62static const char *printable_type(struct object *obj)
  63{
  64        const char *ret;
  65
  66        if (obj->type == OBJ_NONE) {
  67                enum object_type type = sha1_object_info(obj->oid.hash, NULL);
  68                if (type > 0)
  69                        object_as_type(obj, type, 0);
  70        }
  71
  72        ret = typename(obj->type);
  73        if (!ret)
  74                ret = "unknown";
  75
  76        return ret;
  77}
  78
  79static int fsck_config(const char *var, const char *value, void *cb)
  80{
  81        if (strcmp(var, "fsck.skiplist") == 0) {
  82                const char *path;
  83                struct strbuf sb = STRBUF_INIT;
  84
  85                if (git_config_pathname(&path, var, value))
  86                        return 1;
  87                strbuf_addf(&sb, "skiplist=%s", path);
  88                free((char *)path);
  89                fsck_set_msg_types(&fsck_obj_options, sb.buf);
  90                strbuf_release(&sb);
  91                return 0;
  92        }
  93
  94        if (skip_prefix(var, "fsck.", &var)) {
  95                fsck_set_msg_type(&fsck_obj_options, var, value);
  96                return 0;
  97        }
  98
  99        return git_default_config(var, value, cb);
 100}
 101
 102static void objreport(struct object *obj, const char *msg_type,
 103                        const char *err)
 104{
 105        fprintf(stderr, "%s in %s %s: %s\n",
 106                msg_type, printable_type(obj), describe_object(obj), err);
 107}
 108
 109static int objerror(struct object *obj, const char *err)
 110{
 111        errors_found |= ERROR_OBJECT;
 112        objreport(obj, "error", err);
 113        return -1;
 114}
 115
 116static int fsck_error_func(struct fsck_options *o,
 117        struct object *obj, int type, const char *message)
 118{
 119        objreport(obj, (type == FSCK_WARN) ? "warning" : "error", message);
 120        return (type == FSCK_WARN) ? 0 : 1;
 121}
 122
 123static struct object_array pending;
 124
 125static int mark_object(struct object *obj, int type, void *data, struct fsck_options *options)
 126{
 127        struct object *parent = data;
 128
 129        /*
 130         * The only case data is NULL or type is OBJ_ANY is when
 131         * mark_object_reachable() calls us.  All the callers of
 132         * that function has non-NULL obj hence ...
 133         */
 134        if (!obj) {
 135                /* ... these references to parent->fld are safe here */
 136                printf("broken link from %7s %s\n",
 137                           printable_type(parent), describe_object(parent));
 138                printf("broken link from %7s %s\n",
 139                           (type == OBJ_ANY ? "unknown" : typename(type)), "unknown");
 140                errors_found |= ERROR_REACHABLE;
 141                return 1;
 142        }
 143
 144        if (type != OBJ_ANY && obj->type != type)
 145                /* ... and the reference to parent is safe here */
 146                objerror(parent, "wrong object type in link");
 147
 148        if (obj->flags & REACHABLE)
 149                return 0;
 150        obj->flags |= REACHABLE;
 151        if (!(obj->flags & HAS_OBJ)) {
 152                if (parent && !has_object_file(&obj->oid)) {
 153                        printf("broken link from %7s %s\n",
 154                                 printable_type(parent), describe_object(parent));
 155                        printf("              to %7s %s\n",
 156                                 printable_type(obj), describe_object(obj));
 157                        errors_found |= ERROR_REACHABLE;
 158                }
 159                return 1;
 160        }
 161
 162        add_object_array(obj, NULL, &pending);
 163        return 0;
 164}
 165
 166static void mark_object_reachable(struct object *obj)
 167{
 168        mark_object(obj, OBJ_ANY, NULL, NULL);
 169}
 170
 171static int traverse_one_object(struct object *obj)
 172{
 173        return fsck_walk(obj, obj, &fsck_walk_options);
 174}
 175
 176static int traverse_reachable(void)
 177{
 178        struct progress *progress = NULL;
 179        unsigned int nr = 0;
 180        int result = 0;
 181        if (show_progress)
 182                progress = start_progress_delay(_("Checking connectivity"), 0, 0, 2);
 183        while (pending.nr) {
 184                struct object_array_entry *entry;
 185                struct object *obj;
 186
 187                entry = pending.objects + --pending.nr;
 188                obj = entry->item;
 189                result |= traverse_one_object(obj);
 190                display_progress(progress, ++nr);
 191        }
 192        stop_progress(&progress);
 193        return !!result;
 194}
 195
 196static int mark_used(struct object *obj, int type, void *data, struct fsck_options *options)
 197{
 198        if (!obj)
 199                return 1;
 200        obj->flags |= USED;
 201        return 0;
 202}
 203
 204/*
 205 * Check a single reachable object
 206 */
 207static void check_reachable_object(struct object *obj)
 208{
 209        /*
 210         * We obviously want the object to be parsed,
 211         * except if it was in a pack-file and we didn't
 212         * do a full fsck
 213         */
 214        if (!(obj->flags & HAS_OBJ)) {
 215                if (has_sha1_pack(obj->oid.hash))
 216                        return; /* it is in pack - forget about it */
 217                printf("missing %s %s\n", printable_type(obj),
 218                        describe_object(obj));
 219                errors_found |= ERROR_REACHABLE;
 220                return;
 221        }
 222}
 223
 224/*
 225 * Check a single unreachable object
 226 */
 227static void check_unreachable_object(struct object *obj)
 228{
 229        /*
 230         * Missing unreachable object? Ignore it. It's not like
 231         * we miss it (since it can't be reached), nor do we want
 232         * to complain about it being unreachable (since it does
 233         * not exist).
 234         */
 235        if (!(obj->flags & HAS_OBJ))
 236                return;
 237
 238        /*
 239         * Unreachable object that exists? Show it if asked to,
 240         * since this is something that is prunable.
 241         */
 242        if (show_unreachable) {
 243                printf("unreachable %s %s\n", printable_type(obj),
 244                        describe_object(obj));
 245                return;
 246        }
 247
 248        /*
 249         * "!USED" means that nothing at all points to it, including
 250         * other unreachable objects. In other words, it's the "tip"
 251         * of some set of unreachable objects, usually a commit that
 252         * got dropped.
 253         *
 254         * Such starting points are more interesting than some random
 255         * set of unreachable objects, so we show them even if the user
 256         * hasn't asked for _all_ unreachable objects. If you have
 257         * deleted a branch by mistake, this is a prime candidate to
 258         * start looking at, for example.
 259         */
 260        if (!(obj->flags & USED)) {
 261                if (show_dangling)
 262                        printf("dangling %s %s\n", printable_type(obj),
 263                               describe_object(obj));
 264                if (write_lost_and_found) {
 265                        char *filename = git_pathdup("lost-found/%s/%s",
 266                                obj->type == OBJ_COMMIT ? "commit" : "other",
 267                                describe_object(obj));
 268                        FILE *f;
 269
 270                        if (safe_create_leading_directories_const(filename)) {
 271                                error("Could not create lost-found");
 272                                free(filename);
 273                                return;
 274                        }
 275                        f = xfopen(filename, "w");
 276                        if (obj->type == OBJ_BLOB) {
 277                                if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
 278                                        die_errno("Could not write '%s'", filename);
 279                        } else
 280                                fprintf(f, "%s\n", describe_object(obj));
 281                        if (fclose(f))
 282                                die_errno("Could not finish '%s'",
 283                                          filename);
 284                        free(filename);
 285                }
 286                return;
 287        }
 288
 289        /*
 290         * Otherwise? It's there, it's unreachable, and some other unreachable
 291         * object points to it. Ignore it - it's not interesting, and we showed
 292         * all the interesting cases above.
 293         */
 294}
 295
 296static void check_object(struct object *obj)
 297{
 298        if (verbose)
 299                fprintf(stderr, "Checking %s\n", describe_object(obj));
 300
 301        if (obj->flags & REACHABLE)
 302                check_reachable_object(obj);
 303        else
 304                check_unreachable_object(obj);
 305}
 306
 307static void check_connectivity(void)
 308{
 309        int i, max;
 310
 311        /* Traverse the pending reachable objects */
 312        traverse_reachable();
 313
 314        /* Look up all the requirements, warn about missing objects.. */
 315        max = get_max_object_index();
 316        if (verbose)
 317                fprintf(stderr, "Checking connectivity (%d objects)\n", max);
 318
 319        for (i = 0; i < max; i++) {
 320                struct object *obj = get_indexed_object(i);
 321
 322                if (obj)
 323                        check_object(obj);
 324        }
 325}
 326
 327static int fsck_obj(struct object *obj)
 328{
 329        if (obj->flags & SEEN)
 330                return 0;
 331        obj->flags |= SEEN;
 332
 333        if (verbose)
 334                fprintf(stderr, "Checking %s %s\n",
 335                        printable_type(obj), describe_object(obj));
 336
 337        if (fsck_walk(obj, NULL, &fsck_obj_options))
 338                objerror(obj, "broken links");
 339        if (fsck_object(obj, NULL, 0, &fsck_obj_options))
 340                return -1;
 341
 342        if (obj->type == OBJ_TREE) {
 343                struct tree *item = (struct tree *) obj;
 344
 345                free_tree_buffer(item);
 346        }
 347
 348        if (obj->type == OBJ_COMMIT) {
 349                struct commit *commit = (struct commit *) obj;
 350
 351                free_commit_buffer(commit);
 352
 353                if (!commit->parents && show_root)
 354                        printf("root %s\n", describe_object(&commit->object));
 355        }
 356
 357        if (obj->type == OBJ_TAG) {
 358                struct tag *tag = (struct tag *) obj;
 359
 360                if (show_tags && tag->tagged) {
 361                        printf("tagged %s %s", printable_type(tag->tagged),
 362                                describe_object(tag->tagged));
 363                        printf(" (%s) in %s\n", tag->tag,
 364                                describe_object(&tag->object));
 365                }
 366        }
 367
 368        return 0;
 369}
 370
 371static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
 372                           unsigned long size, void *buffer, int *eaten)
 373{
 374        /*
 375         * Note, buffer may be NULL if type is OBJ_BLOB. See
 376         * verify_packfile(), data_valid variable for details.
 377         */
 378        struct object *obj;
 379        obj = parse_object_buffer(oid, type, size, buffer, eaten);
 380        if (!obj) {
 381                errors_found |= ERROR_OBJECT;
 382                return error("%s: object corrupt or missing", oid_to_hex(oid));
 383        }
 384        obj->flags &= ~(REACHABLE | SEEN);
 385        obj->flags |= HAS_OBJ;
 386        return fsck_obj(obj);
 387}
 388
 389static int default_refs;
 390
 391static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
 392        timestamp_t timestamp)
 393{
 394        struct object *obj;
 395
 396        if (!is_null_oid(oid)) {
 397                obj = lookup_object(oid->hash);
 398                if (obj && (obj->flags & HAS_OBJ)) {
 399                        if (timestamp && name_objects)
 400                                add_decoration(fsck_walk_options.object_names,
 401                                        obj,
 402                                        xstrfmt("%s@{%"PRItime"}", refname, timestamp));
 403                        obj->flags |= USED;
 404                        mark_object_reachable(obj);
 405                } else {
 406                        error("%s: invalid reflog entry %s", refname, oid_to_hex(oid));
 407                        errors_found |= ERROR_REACHABLE;
 408                }
 409        }
 410}
 411
 412static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid,
 413                const char *email, timestamp_t timestamp, int tz,
 414                const char *message, void *cb_data)
 415{
 416        const char *refname = cb_data;
 417
 418        if (verbose)
 419                fprintf(stderr, "Checking reflog %s->%s\n",
 420                        oid_to_hex(ooid), oid_to_hex(noid));
 421
 422        fsck_handle_reflog_oid(refname, ooid, 0);
 423        fsck_handle_reflog_oid(refname, noid, timestamp);
 424        return 0;
 425}
 426
 427static int fsck_handle_reflog(const char *logname, const struct object_id *oid,
 428                              int flag, void *cb_data)
 429{
 430        for_each_reflog_ent(logname, fsck_handle_reflog_ent, (void *)logname);
 431        return 0;
 432}
 433
 434static int fsck_handle_ref(const char *refname, const struct object_id *oid,
 435                           int flag, void *cb_data)
 436{
 437        struct object *obj;
 438
 439        obj = parse_object(oid);
 440        if (!obj) {
 441                error("%s: invalid sha1 pointer %s", refname, oid_to_hex(oid));
 442                errors_found |= ERROR_REACHABLE;
 443                /* We'll continue with the rest despite the error.. */
 444                return 0;
 445        }
 446        if (obj->type != OBJ_COMMIT && is_branch(refname)) {
 447                error("%s: not a commit", refname);
 448                errors_found |= ERROR_REFS;
 449        }
 450        default_refs++;
 451        obj->flags |= USED;
 452        if (name_objects)
 453                add_decoration(fsck_walk_options.object_names,
 454                        obj, xstrdup(refname));
 455        mark_object_reachable(obj);
 456
 457        return 0;
 458}
 459
 460static void get_default_heads(void)
 461{
 462        if (head_points_at && !is_null_oid(&head_oid))
 463                fsck_handle_ref("HEAD", &head_oid, 0, NULL);
 464        for_each_rawref(fsck_handle_ref, NULL);
 465        if (include_reflogs)
 466                for_each_reflog(fsck_handle_reflog, NULL);
 467
 468        /*
 469         * Not having any default heads isn't really fatal, but
 470         * it does mean that "--unreachable" no longer makes any
 471         * sense (since in this case everything will obviously
 472         * be unreachable by definition.
 473         *
 474         * Showing dangling objects is valid, though (as those
 475         * dangling objects are likely lost heads).
 476         *
 477         * So we just print a warning about it, and clear the
 478         * "show_unreachable" flag.
 479         */
 480        if (!default_refs) {
 481                fprintf(stderr, "notice: No default references\n");
 482                show_unreachable = 0;
 483        }
 484}
 485
 486static struct object *parse_loose_object(const struct object_id *oid,
 487                                         const char *path)
 488{
 489        struct object *obj;
 490        void *contents;
 491        enum object_type type;
 492        unsigned long size;
 493        int eaten;
 494
 495        if (read_loose_object(path, oid->hash, &type, &size, &contents) < 0)
 496                return NULL;
 497
 498        if (!contents && type != OBJ_BLOB)
 499                die("BUG: read_loose_object streamed a non-blob");
 500
 501        obj = parse_object_buffer(oid, type, size, contents, &eaten);
 502
 503        if (!eaten)
 504                free(contents);
 505        return obj;
 506}
 507
 508static int fsck_loose(const struct object_id *oid, const char *path, void *data)
 509{
 510        struct object *obj = parse_loose_object(oid, path);
 511
 512        if (!obj) {
 513                errors_found |= ERROR_OBJECT;
 514                error("%s: object corrupt or missing: %s",
 515                      oid_to_hex(oid), path);
 516                return 0; /* keep checking other objects */
 517        }
 518
 519        obj->flags &= ~(REACHABLE | SEEN);
 520        obj->flags |= HAS_OBJ;
 521        if (fsck_obj(obj))
 522                errors_found |= ERROR_OBJECT;
 523        return 0;
 524}
 525
 526static int fsck_cruft(const char *basename, const char *path, void *data)
 527{
 528        if (!starts_with(basename, "tmp_obj_"))
 529                fprintf(stderr, "bad sha1 file: %s\n", path);
 530        return 0;
 531}
 532
 533static int fsck_subdir(unsigned int nr, const char *path, void *progress)
 534{
 535        display_progress(progress, nr + 1);
 536        return 0;
 537}
 538
 539static void fsck_object_dir(const char *path)
 540{
 541        struct progress *progress = NULL;
 542
 543        if (verbose)
 544                fprintf(stderr, "Checking object directory\n");
 545
 546        if (show_progress)
 547                progress = start_progress(_("Checking object directories"), 256);
 548
 549        for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
 550                                      progress);
 551        display_progress(progress, 256);
 552        stop_progress(&progress);
 553}
 554
 555static int fsck_head_link(void)
 556{
 557        int null_is_error = 0;
 558
 559        if (verbose)
 560                fprintf(stderr, "Checking HEAD link\n");
 561
 562        head_points_at = resolve_ref_unsafe("HEAD", 0, head_oid.hash, NULL);
 563        if (!head_points_at) {
 564                errors_found |= ERROR_REFS;
 565                return error("Invalid HEAD");
 566        }
 567        if (!strcmp(head_points_at, "HEAD"))
 568                /* detached HEAD */
 569                null_is_error = 1;
 570        else if (!starts_with(head_points_at, "refs/heads/")) {
 571                errors_found |= ERROR_REFS;
 572                return error("HEAD points to something strange (%s)",
 573                             head_points_at);
 574        }
 575        if (is_null_oid(&head_oid)) {
 576                if (null_is_error) {
 577                        errors_found |= ERROR_REFS;
 578                        return error("HEAD: detached HEAD points at nothing");
 579                }
 580                fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
 581                        head_points_at + 11);
 582        }
 583        return 0;
 584}
 585
 586static int fsck_cache_tree(struct cache_tree *it)
 587{
 588        int i;
 589        int err = 0;
 590
 591        if (verbose)
 592                fprintf(stderr, "Checking cache tree\n");
 593
 594        if (0 <= it->entry_count) {
 595                struct object *obj = parse_object(&it->oid);
 596                if (!obj) {
 597                        error("%s: invalid sha1 pointer in cache-tree",
 598                              oid_to_hex(&it->oid));
 599                        errors_found |= ERROR_REFS;
 600                        return 1;
 601                }
 602                obj->flags |= USED;
 603                if (name_objects)
 604                        add_decoration(fsck_walk_options.object_names,
 605                                obj, xstrdup(":"));
 606                mark_object_reachable(obj);
 607                if (obj->type != OBJ_TREE)
 608                        err |= objerror(obj, "non-tree in cache-tree");
 609        }
 610        for (i = 0; i < it->subtree_nr; i++)
 611                err |= fsck_cache_tree(it->down[i]->cache_tree);
 612        return err;
 613}
 614
 615static void mark_object_for_connectivity(const struct object_id *oid)
 616{
 617        struct object *obj = lookup_unknown_object(oid->hash);
 618        obj->flags |= HAS_OBJ;
 619}
 620
 621static int mark_loose_for_connectivity(const struct object_id *oid,
 622                                       const char *path,
 623                                       void *data)
 624{
 625        mark_object_for_connectivity(oid);
 626        return 0;
 627}
 628
 629static int mark_packed_for_connectivity(const struct object_id *oid,
 630                                        struct packed_git *pack,
 631                                        uint32_t pos,
 632                                        void *data)
 633{
 634        mark_object_for_connectivity(oid);
 635        return 0;
 636}
 637
 638static char const * const fsck_usage[] = {
 639        N_("git fsck [<options>] [<object>...]"),
 640        NULL
 641};
 642
 643static struct option fsck_opts[] = {
 644        OPT__VERBOSE(&verbose, N_("be verbose")),
 645        OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
 646        OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
 647        OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
 648        OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
 649        OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
 650        OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
 651        OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
 652        OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
 653        OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
 654        OPT_BOOL(0, "lost-found", &write_lost_and_found,
 655                                N_("write dangling objects in .git/lost-found")),
 656        OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 657        OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
 658        OPT_END(),
 659};
 660
 661int cmd_fsck(int argc, const char **argv, const char *prefix)
 662{
 663        int i;
 664        struct alternate_object_database *alt;
 665
 666        errors_found = 0;
 667        check_replace_refs = 0;
 668
 669        argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
 670
 671        fsck_walk_options.walk = mark_object;
 672        fsck_obj_options.walk = mark_used;
 673        fsck_obj_options.error_func = fsck_error_func;
 674        if (check_strict)
 675                fsck_obj_options.strict = 1;
 676
 677        if (show_progress == -1)
 678                show_progress = isatty(2);
 679        if (verbose)
 680                show_progress = 0;
 681
 682        if (write_lost_and_found) {
 683                check_full = 1;
 684                include_reflogs = 0;
 685        }
 686
 687        if (name_objects)
 688                fsck_walk_options.object_names =
 689                        xcalloc(1, sizeof(struct decoration));
 690
 691        git_config(fsck_config, NULL);
 692
 693        fsck_head_link();
 694        if (connectivity_only) {
 695                for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
 696                for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
 697        } else {
 698                fsck_object_dir(get_object_directory());
 699
 700                prepare_alt_odb();
 701                for (alt = alt_odb_list; alt; alt = alt->next)
 702                        fsck_object_dir(alt->path);
 703
 704                if (check_full) {
 705                        struct packed_git *p;
 706                        uint32_t total = 0, count = 0;
 707                        struct progress *progress = NULL;
 708
 709                        prepare_packed_git();
 710
 711                        if (show_progress) {
 712                                for (p = packed_git; p; p = p->next) {
 713                                        if (open_pack_index(p))
 714                                                continue;
 715                                        total += p->num_objects;
 716                                }
 717
 718                                progress = start_progress(_("Checking objects"), total);
 719                        }
 720                        for (p = packed_git; p; p = p->next) {
 721                                /* verify gives error messages itself */
 722                                if (verify_pack(p, fsck_obj_buffer,
 723                                                progress, count))
 724                                        errors_found |= ERROR_PACK;
 725                                count += p->num_objects;
 726                        }
 727                        stop_progress(&progress);
 728                }
 729        }
 730
 731        for (i = 0; i < argc; i++) {
 732                const char *arg = argv[i];
 733                unsigned char sha1[20];
 734                if (!get_sha1(arg, sha1)) {
 735                        struct object *obj = lookup_object(sha1);
 736
 737                        if (!obj || !(obj->flags & HAS_OBJ)) {
 738                                error("%s: object missing", sha1_to_hex(sha1));
 739                                errors_found |= ERROR_OBJECT;
 740                                continue;
 741                        }
 742
 743                        obj->flags |= USED;
 744                        if (name_objects)
 745                                add_decoration(fsck_walk_options.object_names,
 746                                        obj, xstrdup(arg));
 747                        mark_object_reachable(obj);
 748                        continue;
 749                }
 750                error("invalid parameter: expected sha1, got '%s'", arg);
 751                errors_found |= ERROR_OBJECT;
 752        }
 753
 754        /*
 755         * If we've not been given any explicit head information, do the
 756         * default ones from .git/refs. We also consider the index file
 757         * in this case (ie this implies --cache).
 758         */
 759        if (!argc) {
 760                get_default_heads();
 761                keep_cache_objects = 1;
 762        }
 763
 764        if (keep_cache_objects) {
 765                verify_index_checksum = 1;
 766                read_cache();
 767                for (i = 0; i < active_nr; i++) {
 768                        unsigned int mode;
 769                        struct blob *blob;
 770                        struct object *obj;
 771
 772                        mode = active_cache[i]->ce_mode;
 773                        if (S_ISGITLINK(mode))
 774                                continue;
 775                        blob = lookup_blob(&active_cache[i]->oid);
 776                        if (!blob)
 777                                continue;
 778                        obj = &blob->object;
 779                        obj->flags |= USED;
 780                        if (name_objects)
 781                                add_decoration(fsck_walk_options.object_names,
 782                                        obj,
 783                                        xstrfmt(":%s", active_cache[i]->name));
 784                        mark_object_reachable(obj);
 785                }
 786                if (active_cache_tree)
 787                        fsck_cache_tree(active_cache_tree);
 788        }
 789
 790        check_connectivity();
 791        return errors_found;
 792}