Andrew's git - gitweb.git/blob

   1#include "builtin.h"
   2#include "config.h"
   3#include "lockfile.h"
   4#include "object-store.h"
   5#include "repository.h"
   6#include "commit.h"
   7#include "refs.h"
   8#include "dir.h"
   9#include "tree-walk.h"
  10#include "diff.h"
  11#include "revision.h"
  12#include "reachable.h"
  13
  14/* NEEDSWORK: switch to using parse_options */
  15static const char reflog_expire_usage[] =
  16"git reflog expire [--expire=<time>] [--expire-unreachable=<time>] [--rewrite] [--updateref] [--stale-fix] [--dry-run | -n] [--verbose] [--all] <refs>...";
  17static const char reflog_delete_usage[] =
  18"git reflog delete [--rewrite] [--updateref] [--dry-run | -n] [--verbose] <refs>...";
  19static const char reflog_exists_usage[] =
  20"git reflog exists <ref>";
  21
  22static timestamp_t default_reflog_expire;
  23static timestamp_t default_reflog_expire_unreachable;
  24
  25struct cmd_reflog_expire_cb {
  26        struct rev_info revs;
  27        int stalefix;
  28        timestamp_t expire_total;
  29        timestamp_t expire_unreachable;
  30        int recno;
  31};
  32
  33struct expire_reflog_policy_cb {
  34        enum {
  35                UE_NORMAL,
  36                UE_ALWAYS,
  37                UE_HEAD
  38        } unreachable_expire_kind;
  39        struct commit_list *mark_list;
  40        unsigned long mark_limit;
  41        struct cmd_reflog_expire_cb cmd;
  42        struct commit *tip_commit;
  43        struct commit_list *tips;
  44};
  45
  46struct collected_reflog {
  47        struct object_id oid;
  48        char reflog[FLEX_ARRAY];
  49};
  50
  51struct collect_reflog_cb {
  52        struct collected_reflog **e;
  53        int alloc;
  54        int nr;
  55};
  56
  57/* Remember to update object flag allocation in object.h */
  58#define INCOMPLETE      (1u<<10)
  59#define STUDYING        (1u<<11)
  60#define REACHABLE       (1u<<12)
  61
  62static int tree_is_complete(const struct object_id *oid)
  63{
  64        struct tree_desc desc;
  65        struct name_entry entry;
  66        int complete;
  67        struct tree *tree;
  68
  69        tree = lookup_tree(oid);
  70        if (!tree)
  71                return 0;
  72        if (tree->object.flags & SEEN)
  73                return 1;
  74        if (tree->object.flags & INCOMPLETE)
  75                return 0;
  76
  77        if (!tree->buffer) {
  78                enum object_type type;
  79                unsigned long size;
  80                void *data = read_object_file(oid, &type, &size);
  81                if (!data) {
  82                        tree->object.flags |= INCOMPLETE;
  83                        return 0;
  84                }
  85                tree->buffer = data;
  86                tree->size = size;
  87        }
  88        init_tree_desc(&desc, tree->buffer, tree->size);
  89        complete = 1;
  90        while (tree_entry(&desc, &entry)) {
  91                if (!has_sha1_file(entry.oid->hash) ||
  92                    (S_ISDIR(entry.mode) && !tree_is_complete(entry.oid))) {
  93                        tree->object.flags |= INCOMPLETE;
  94                        complete = 0;
  95                }
  96        }
  97        free_tree_buffer(tree);
  98
  99        if (complete)
 100                tree->object.flags |= SEEN;
 101        return complete;
 102}
 103
 104static int commit_is_complete(struct commit *commit)
 105{
 106        struct object_array study;
 107        struct object_array found;
 108        int is_incomplete = 0;
 109        int i;
 110
 111        /* early return */
 112        if (commit->object.flags & SEEN)
 113                return 1;
 114        if (commit->object.flags & INCOMPLETE)
 115                return 0;
 116        /*
 117         * Find all commits that are reachable and are not marked as
 118         * SEEN.  Then make sure the trees and blobs contained are
 119         * complete.  After that, mark these commits also as SEEN.
 120         * If some of the objects that are needed to complete this
 121         * commit are missing, mark this commit as INCOMPLETE.
 122         */
 123        memset(&study, 0, sizeof(study));
 124        memset(&found, 0, sizeof(found));
 125        add_object_array(&commit->object, NULL, &study);
 126        add_object_array(&commit->object, NULL, &found);
 127        commit->object.flags |= STUDYING;
 128        while (study.nr) {
 129                struct commit *c;
 130                struct commit_list *parent;
 131
 132                c = (struct commit *)object_array_pop(&study);
 133                if (!c->object.parsed && !parse_object(the_repository, &c->object.oid))
 134                        c->object.flags |= INCOMPLETE;
 135
 136                if (c->object.flags & INCOMPLETE) {
 137                        is_incomplete = 1;
 138                        break;
 139                }
 140                else if (c->object.flags & SEEN)
 141                        continue;
 142                for (parent = c->parents; parent; parent = parent->next) {
 143                        struct commit *p = parent->item;
 144                        if (p->object.flags & STUDYING)
 145                                continue;
 146                        p->object.flags |= STUDYING;
 147                        add_object_array(&p->object, NULL, &study);
 148                        add_object_array(&p->object, NULL, &found);
 149                }
 150        }
 151        if (!is_incomplete) {
 152                /*
 153                 * make sure all commits in "found" array have all the
 154                 * necessary objects.
 155                 */
 156                for (i = 0; i < found.nr; i++) {
 157                        struct commit *c =
 158                                (struct commit *)found.objects[i].item;
 159                        if (!tree_is_complete(get_commit_tree_oid(c))) {
 160                                is_incomplete = 1;
 161                                c->object.flags |= INCOMPLETE;
 162                        }
 163                }
 164                if (!is_incomplete) {
 165                        /* mark all found commits as complete, iow SEEN */
 166                        for (i = 0; i < found.nr; i++)
 167                                found.objects[i].item->flags |= SEEN;
 168                }
 169        }
 170        /* clear flags from the objects we traversed */
 171        for (i = 0; i < found.nr; i++)
 172                found.objects[i].item->flags &= ~STUDYING;
 173        if (is_incomplete)
 174                commit->object.flags |= INCOMPLETE;
 175        else {
 176                /*
 177                 * If we come here, we have (1) traversed the ancestry chain
 178                 * from the "commit" until we reach SEEN commits (which are
 179                 * known to be complete), and (2) made sure that the commits
 180                 * encountered during the above traversal refer to trees that
 181                 * are complete.  Which means that we know *all* the commits
 182                 * we have seen during this process are complete.
 183                 */
 184                for (i = 0; i < found.nr; i++)
 185                        found.objects[i].item->flags |= SEEN;
 186        }
 187        /* free object arrays */
 188        object_array_clear(&study);
 189        object_array_clear(&found);
 190        return !is_incomplete;
 191}
 192
 193static int keep_entry(struct commit **it, struct object_id *oid)
 194{
 195        struct commit *commit;
 196
 197        if (is_null_oid(oid))
 198                return 1;
 199        commit = lookup_commit_reference_gently(oid, 1);
 200        if (!commit)
 201                return 0;
 202
 203        /*
 204         * Make sure everything in this commit exists.
 205         *
 206         * We have walked all the objects reachable from the refs
 207         * and cache earlier.  The commits reachable by this commit
 208         * must meet SEEN commits -- and then we should mark them as
 209         * SEEN as well.
 210         */
 211        if (!commit_is_complete(commit))
 212                return 0;
 213        *it = commit;
 214        return 1;
 215}
 216
 217/*
 218 * Starting from commits in the cb->mark_list, mark commits that are
 219 * reachable from them.  Stop the traversal at commits older than
 220 * the expire_limit and queue them back, so that the caller can call
 221 * us again to restart the traversal with longer expire_limit.
 222 */
 223static void mark_reachable(struct expire_reflog_policy_cb *cb)
 224{
 225        struct commit_list *pending;
 226        timestamp_t expire_limit = cb->mark_limit;
 227        struct commit_list *leftover = NULL;
 228
 229        for (pending = cb->mark_list; pending; pending = pending->next)
 230                pending->item->object.flags &= ~REACHABLE;
 231
 232        pending = cb->mark_list;
 233        while (pending) {
 234                struct commit_list *parent;
 235                struct commit *commit = pop_commit(&pending);
 236                if (commit->object.flags & REACHABLE)
 237                        continue;
 238                if (parse_commit(commit))
 239                        continue;
 240                commit->object.flags |= REACHABLE;
 241                if (commit->date < expire_limit) {
 242                        commit_list_insert(commit, &leftover);
 243                        continue;
 244                }
 245                commit->object.flags |= REACHABLE;
 246                parent = commit->parents;
 247                while (parent) {
 248                        commit = parent->item;
 249                        parent = parent->next;
 250                        if (commit->object.flags & REACHABLE)
 251                                continue;
 252                        commit_list_insert(commit, &pending);
 253                }
 254        }
 255        cb->mark_list = leftover;
 256}
 257
 258static int unreachable(struct expire_reflog_policy_cb *cb, struct commit *commit, struct object_id *oid)
 259{
 260        /*
 261         * We may or may not have the commit yet - if not, look it
 262         * up using the supplied sha1.
 263         */
 264        if (!commit) {
 265                if (is_null_oid(oid))
 266                        return 0;
 267
 268                commit = lookup_commit_reference_gently(oid, 1);
 269
 270                /* Not a commit -- keep it */
 271                if (!commit)
 272                        return 0;
 273        }
 274
 275        /* Reachable from the current ref?  Don't prune. */
 276        if (commit->object.flags & REACHABLE)
 277                return 0;
 278
 279        if (cb->mark_list && cb->mark_limit) {
 280                cb->mark_limit = 0; /* dig down to the root */
 281                mark_reachable(cb);
 282        }
 283
 284        return !(commit->object.flags & REACHABLE);
 285}
 286
 287/*
 288 * Return true iff the specified reflog entry should be expired.
 289 */
 290static int should_expire_reflog_ent(struct object_id *ooid, struct object_id *noid,
 291                                    const char *email, timestamp_t timestamp, int tz,
 292                                    const char *message, void *cb_data)
 293{
 294        struct expire_reflog_policy_cb *cb = cb_data;
 295        struct commit *old_commit, *new_commit;
 296
 297        if (timestamp < cb->cmd.expire_total)
 298                return 1;
 299
 300        old_commit = new_commit = NULL;
 301        if (cb->cmd.stalefix &&
 302            (!keep_entry(&old_commit, ooid) || !keep_entry(&new_commit, noid)))
 303                return 1;
 304
 305        if (timestamp < cb->cmd.expire_unreachable) {
 306                if (cb->unreachable_expire_kind == UE_ALWAYS)
 307                        return 1;
 308                if (unreachable(cb, old_commit, ooid) || unreachable(cb, new_commit, noid))
 309                        return 1;
 310        }
 311
 312        if (cb->cmd.recno && --(cb->cmd.recno) == 0)
 313                return 1;
 314
 315        return 0;
 316}
 317
 318static int push_tip_to_list(const char *refname, const struct object_id *oid,
 319                            int flags, void *cb_data)
 320{
 321        struct commit_list **list = cb_data;
 322        struct commit *tip_commit;
 323        if (flags & REF_ISSYMREF)
 324                return 0;
 325        tip_commit = lookup_commit_reference_gently(oid, 1);
 326        if (!tip_commit)
 327                return 0;
 328        commit_list_insert(tip_commit, list);
 329        return 0;
 330}
 331
 332static void reflog_expiry_prepare(const char *refname,
 333                                  const struct object_id *oid,
 334                                  void *cb_data)
 335{
 336        struct expire_reflog_policy_cb *cb = cb_data;
 337
 338        if (!cb->cmd.expire_unreachable || !strcmp(refname, "HEAD")) {
 339                cb->tip_commit = NULL;
 340                cb->unreachable_expire_kind = UE_HEAD;
 341        } else {
 342                cb->tip_commit = lookup_commit_reference_gently(oid, 1);
 343                if (!cb->tip_commit)
 344                        cb->unreachable_expire_kind = UE_ALWAYS;
 345                else
 346                        cb->unreachable_expire_kind = UE_NORMAL;
 347        }
 348
 349        if (cb->cmd.expire_unreachable <= cb->cmd.expire_total)
 350                cb->unreachable_expire_kind = UE_ALWAYS;
 351
 352        cb->mark_list = NULL;
 353        cb->tips = NULL;
 354        if (cb->unreachable_expire_kind != UE_ALWAYS) {
 355                if (cb->unreachable_expire_kind == UE_HEAD) {
 356                        struct commit_list *elem;
 357
 358                        for_each_ref(push_tip_to_list, &cb->tips);
 359                        for (elem = cb->tips; elem; elem = elem->next)
 360                                commit_list_insert(elem->item, &cb->mark_list);
 361                } else {
 362                        commit_list_insert(cb->tip_commit, &cb->mark_list);
 363                }
 364                cb->mark_limit = cb->cmd.expire_total;
 365                mark_reachable(cb);
 366        }
 367}
 368
 369static void reflog_expiry_cleanup(void *cb_data)
 370{
 371        struct expire_reflog_policy_cb *cb = cb_data;
 372
 373        if (cb->unreachable_expire_kind != UE_ALWAYS) {
 374                if (cb->unreachable_expire_kind == UE_HEAD) {
 375                        struct commit_list *elem;
 376                        for (elem = cb->tips; elem; elem = elem->next)
 377                                clear_commit_marks(elem->item, REACHABLE);
 378                        free_commit_list(cb->tips);
 379                } else {
 380                        clear_commit_marks(cb->tip_commit, REACHABLE);
 381                }
 382        }
 383}
 384
 385static int collect_reflog(const char *ref, const struct object_id *oid, int unused, void *cb_data)
 386{
 387        struct collected_reflog *e;
 388        struct collect_reflog_cb *cb = cb_data;
 389
 390        FLEX_ALLOC_STR(e, reflog, ref);
 391        oidcpy(&e->oid, oid);
 392        ALLOC_GROW(cb->e, cb->nr + 1, cb->alloc);
 393        cb->e[cb->nr++] = e;
 394        return 0;
 395}
 396
 397static struct reflog_expire_cfg {
 398        struct reflog_expire_cfg *next;
 399        timestamp_t expire_total;
 400        timestamp_t expire_unreachable;
 401        char pattern[FLEX_ARRAY];
 402} *reflog_expire_cfg, **reflog_expire_cfg_tail;
 403
 404static struct reflog_expire_cfg *find_cfg_ent(const char *pattern, size_t len)
 405{
 406        struct reflog_expire_cfg *ent;
 407
 408        if (!reflog_expire_cfg_tail)
 409                reflog_expire_cfg_tail = &reflog_expire_cfg;
 410
 411        for (ent = reflog_expire_cfg; ent; ent = ent->next)
 412                if (!strncmp(ent->pattern, pattern, len) &&
 413                    ent->pattern[len] == '\0')
 414                        return ent;
 415
 416        FLEX_ALLOC_MEM(ent, pattern, pattern, len);
 417        *reflog_expire_cfg_tail = ent;
 418        reflog_expire_cfg_tail = &(ent->next);
 419        return ent;
 420}
 421
 422/* expiry timer slot */
 423#define EXPIRE_TOTAL   01
 424#define EXPIRE_UNREACH 02
 425
 426static int reflog_expire_config(const char *var, const char *value, void *cb)
 427{
 428        const char *pattern, *key;
 429        int pattern_len;
 430        timestamp_t expire;
 431        int slot;
 432        struct reflog_expire_cfg *ent;
 433
 434        if (parse_config_key(var, "gc", &pattern, &pattern_len, &key) < 0)
 435                return git_default_config(var, value, cb);
 436
 437        if (!strcmp(key, "reflogexpire")) {
 438                slot = EXPIRE_TOTAL;
 439                if (git_config_expiry_date(&expire, var, value))
 440                        return -1;
 441        } else if (!strcmp(key, "reflogexpireunreachable")) {
 442                slot = EXPIRE_UNREACH;
 443                if (git_config_expiry_date(&expire, var, value))
 444                        return -1;
 445        } else
 446                return git_default_config(var, value, cb);
 447
 448        if (!pattern) {
 449                switch (slot) {
 450                case EXPIRE_TOTAL:
 451                        default_reflog_expire = expire;
 452                        break;
 453                case EXPIRE_UNREACH:
 454                        default_reflog_expire_unreachable = expire;
 455                        break;
 456                }
 457                return 0;
 458        }
 459
 460        ent = find_cfg_ent(pattern, pattern_len);
 461        if (!ent)
 462                return -1;
 463        switch (slot) {
 464        case EXPIRE_TOTAL:
 465                ent->expire_total = expire;
 466                break;
 467        case EXPIRE_UNREACH:
 468                ent->expire_unreachable = expire;
 469                break;
 470        }
 471        return 0;
 472}
 473
 474static void set_reflog_expiry_param(struct cmd_reflog_expire_cb *cb, int slot, const char *ref)
 475{
 476        struct reflog_expire_cfg *ent;
 477
 478        if (slot == (EXPIRE_TOTAL|EXPIRE_UNREACH))
 479                return; /* both given explicitly -- nothing to tweak */
 480
 481        for (ent = reflog_expire_cfg; ent; ent = ent->next) {
 482                if (!wildmatch(ent->pattern, ref, 0)) {
 483                        if (!(slot & EXPIRE_TOTAL))
 484                                cb->expire_total = ent->expire_total;
 485                        if (!(slot & EXPIRE_UNREACH))
 486                                cb->expire_unreachable = ent->expire_unreachable;
 487                        return;
 488                }
 489        }
 490
 491        /*
 492         * If unconfigured, make stash never expire
 493         */
 494        if (!strcmp(ref, "refs/stash")) {
 495                if (!(slot & EXPIRE_TOTAL))
 496                        cb->expire_total = 0;
 497                if (!(slot & EXPIRE_UNREACH))
 498                        cb->expire_unreachable = 0;
 499                return;
 500        }
 501
 502        /* Nothing matched -- use the default value */
 503        if (!(slot & EXPIRE_TOTAL))
 504                cb->expire_total = default_reflog_expire;
 505        if (!(slot & EXPIRE_UNREACH))
 506                cb->expire_unreachable = default_reflog_expire_unreachable;
 507}
 508
 509static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
 510{
 511        struct expire_reflog_policy_cb cb;
 512        timestamp_t now = time(NULL);
 513        int i, status, do_all;
 514        int explicit_expiry = 0;
 515        unsigned int flags = 0;
 516
 517        default_reflog_expire_unreachable = now - 30 * 24 * 3600;
 518        default_reflog_expire = now - 90 * 24 * 3600;
 519        git_config(reflog_expire_config, NULL);
 520
 521        save_commit_buffer = 0;
 522        do_all = status = 0;
 523        memset(&cb, 0, sizeof(cb));
 524
 525        cb.cmd.expire_total = default_reflog_expire;
 526        cb.cmd.expire_unreachable = default_reflog_expire_unreachable;
 527
 528        for (i = 1; i < argc; i++) {
 529                const char *arg = argv[i];
 530                if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
 531                        flags |= EXPIRE_REFLOGS_DRY_RUN;
 532                else if (starts_with(arg, "--expire=")) {
 533                        if (parse_expiry_date(arg + 9, &cb.cmd.expire_total))
 534                                die(_("'%s' is not a valid timestamp"), arg);
 535                        explicit_expiry |= EXPIRE_TOTAL;
 536                }
 537                else if (starts_with(arg, "--expire-unreachable=")) {
 538                        if (parse_expiry_date(arg + 21, &cb.cmd.expire_unreachable))
 539                                die(_("'%s' is not a valid timestamp"), arg);
 540                        explicit_expiry |= EXPIRE_UNREACH;
 541                }
 542                else if (!strcmp(arg, "--stale-fix"))
 543                        cb.cmd.stalefix = 1;
 544                else if (!strcmp(arg, "--rewrite"))
 545                        flags |= EXPIRE_REFLOGS_REWRITE;
 546                else if (!strcmp(arg, "--updateref"))
 547                        flags |= EXPIRE_REFLOGS_UPDATE_REF;
 548                else if (!strcmp(arg, "--all"))
 549                        do_all = 1;
 550                else if (!strcmp(arg, "--verbose"))
 551                        flags |= EXPIRE_REFLOGS_VERBOSE;
 552                else if (!strcmp(arg, "--")) {
 553                        i++;
 554                        break;
 555                }
 556                else if (arg[0] == '-')
 557                        usage(reflog_expire_usage);
 558                else
 559                        break;
 560        }
 561
 562        /*
 563         * We can trust the commits and objects reachable from refs
 564         * even in older repository.  We cannot trust what's reachable
 565         * from reflog if the repository was pruned with older git.
 566         */
 567        if (cb.cmd.stalefix) {
 568                init_revisions(&cb.cmd.revs, prefix);
 569                if (flags & EXPIRE_REFLOGS_VERBOSE)
 570                        printf("Marking reachable objects...");
 571                mark_reachable_objects(&cb.cmd.revs, 0, 0, NULL);
 572                if (flags & EXPIRE_REFLOGS_VERBOSE)
 573                        putchar('\n');
 574        }
 575
 576        if (do_all) {
 577                struct collect_reflog_cb collected;
 578                int i;
 579
 580                memset(&collected, 0, sizeof(collected));
 581                for_each_reflog(collect_reflog, &collected);
 582                for (i = 0; i < collected.nr; i++) {
 583                        struct collected_reflog *e = collected.e[i];
 584                        set_reflog_expiry_param(&cb.cmd, explicit_expiry, e->reflog);
 585                        status |= reflog_expire(e->reflog, &e->oid, flags,
 586                                                reflog_expiry_prepare,
 587                                                should_expire_reflog_ent,
 588                                                reflog_expiry_cleanup,
 589                                                &cb);
 590                        free(e);
 591                }
 592                free(collected.e);
 593        }
 594
 595        for (; i < argc; i++) {
 596                char *ref;
 597                struct object_id oid;
 598                if (!dwim_log(argv[i], strlen(argv[i]), &oid, &ref)) {
 599                        status |= error("%s points nowhere!", argv[i]);
 600                        continue;
 601                }
 602                set_reflog_expiry_param(&cb.cmd, explicit_expiry, ref);
 603                status |= reflog_expire(ref, &oid, flags,
 604                                        reflog_expiry_prepare,
 605                                        should_expire_reflog_ent,
 606                                        reflog_expiry_cleanup,
 607                                        &cb);
 608        }
 609        return status;
 610}
 611
 612static int count_reflog_ent(struct object_id *ooid, struct object_id *noid,
 613                const char *email, timestamp_t timestamp, int tz,
 614                const char *message, void *cb_data)
 615{
 616        struct expire_reflog_policy_cb *cb = cb_data;
 617        if (!cb->cmd.expire_total || timestamp < cb->cmd.expire_total)
 618                cb->cmd.recno++;
 619        return 0;
 620}
 621
 622static int cmd_reflog_delete(int argc, const char **argv, const char *prefix)
 623{
 624        struct expire_reflog_policy_cb cb;
 625        int i, status = 0;
 626        unsigned int flags = 0;
 627
 628        memset(&cb, 0, sizeof(cb));
 629
 630        for (i = 1; i < argc; i++) {
 631                const char *arg = argv[i];
 632                if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
 633                        flags |= EXPIRE_REFLOGS_DRY_RUN;
 634                else if (!strcmp(arg, "--rewrite"))
 635                        flags |= EXPIRE_REFLOGS_REWRITE;
 636                else if (!strcmp(arg, "--updateref"))
 637                        flags |= EXPIRE_REFLOGS_UPDATE_REF;
 638                else if (!strcmp(arg, "--verbose"))
 639                        flags |= EXPIRE_REFLOGS_VERBOSE;
 640                else if (!strcmp(arg, "--")) {
 641                        i++;
 642                        break;
 643                }
 644                else if (arg[0] == '-')
 645                        usage(reflog_delete_usage);
 646                else
 647                        break;
 648        }
 649
 650        if (argc - i < 1)
 651                return error("Nothing to delete?");
 652
 653        for ( ; i < argc; i++) {
 654                const char *spec = strstr(argv[i], "@{");
 655                struct object_id oid;
 656                char *ep, *ref;
 657                int recno;
 658
 659                if (!spec) {
 660                        status |= error("Not a reflog: %s", argv[i]);
 661                        continue;
 662                }
 663
 664                if (!dwim_log(argv[i], spec - argv[i], &oid, &ref)) {
 665                        status |= error("no reflog for '%s'", argv[i]);
 666                        continue;
 667                }
 668
 669                recno = strtoul(spec + 2, &ep, 10);
 670                if (*ep == '}') {
 671                        cb.cmd.recno = -recno;
 672                        for_each_reflog_ent(ref, count_reflog_ent, &cb);
 673                } else {
 674                        cb.cmd.expire_total = approxidate(spec + 2);
 675                        for_each_reflog_ent(ref, count_reflog_ent, &cb);
 676                        cb.cmd.expire_total = 0;
 677                }
 678
 679                status |= reflog_expire(ref, &oid, flags,
 680                                        reflog_expiry_prepare,
 681                                        should_expire_reflog_ent,
 682                                        reflog_expiry_cleanup,
 683                                        &cb);
 684                free(ref);
 685        }
 686        return status;
 687}
 688
 689static int cmd_reflog_exists(int argc, const char **argv, const char *prefix)
 690{
 691        int i, start = 0;
 692
 693        for (i = 1; i < argc; i++) {
 694                const char *arg = argv[i];
 695                if (!strcmp(arg, "--")) {
 696                        i++;
 697                        break;
 698                }
 699                else if (arg[0] == '-')
 700                        usage(reflog_exists_usage);
 701                else
 702                        break;
 703        }
 704
 705        start = i;
 706
 707        if (argc - start != 1)
 708                usage(reflog_exists_usage);
 709
 710        if (check_refname_format(argv[start], REFNAME_ALLOW_ONELEVEL))
 711                die("invalid ref format: %s", argv[start]);
 712        return !reflog_exists(argv[start]);
 713}
 714
 715/*
 716 * main "reflog"
 717 */
 718
 719static const char reflog_usage[] =
 720"git reflog [ show | expire | delete | exists ]";
 721
 722int cmd_reflog(int argc, const char **argv, const char *prefix)
 723{
 724        if (argc > 1 && !strcmp(argv[1], "-h"))
 725                usage(reflog_usage);
 726
 727        /* With no command, we default to showing it. */
 728        if (argc < 2 || *argv[1] == '-')
 729                return cmd_log_reflog(argc, argv, prefix);
 730
 731        if (!strcmp(argv[1], "show"))
 732                return cmd_log_reflog(argc - 1, argv + 1, prefix);
 733
 734        if (!strcmp(argv[1], "expire"))
 735                return cmd_reflog_expire(argc - 1, argv + 1, prefix);
 736
 737        if (!strcmp(argv[1], "delete"))
 738                return cmd_reflog_delete(argc - 1, argv + 1, prefix);
 739
 740        if (!strcmp(argv[1], "exists"))
 741                return cmd_reflog_exists(argc - 1, argv + 1, prefix);
 742
 743        return cmd_log_reflog(argc, argv, prefix);
 744}