Andrew's git / gitweb.git / builtin/reflog.c
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builtin / reflog.con commit Merge branch 'np/malloc-threading' (ea5f75a)
   1#include "cache.h"
   2#include "builtin.h"
   3#include "commit.h"
   4#include "refs.h"
   5#include "dir.h"
   6#include "tree-walk.h"
   7#include "diff.h"
   8#include "revision.h"
   9#include "reachable.h"
  10
  11/*
  12 * reflog expire
  13 */
  14
  15static const char reflog_expire_usage[] =
  16"git reflog expire [--verbose] [--dry-run] [--stale-fix] [--expire=<time>] [--expire-unreachable=<time>] [--all] <refs>...";
  17static const char reflog_delete_usage[] =
  18"git reflog delete [--verbose] [--dry-run] [--rewrite] [--updateref] <refs>...";
  19
  20static unsigned long default_reflog_expire;
  21static unsigned long default_reflog_expire_unreachable;
  22
  23struct cmd_reflog_expire_cb {
  24        struct rev_info revs;
  25        int dry_run;
  26        int stalefix;
  27        int rewrite;
  28        int updateref;
  29        int verbose;
  30        unsigned long expire_total;
  31        unsigned long expire_unreachable;
  32        int recno;
  33};
  34
  35struct expire_reflog_cb {
  36        FILE *newlog;
  37        const char *ref;
  38        struct commit *ref_commit;
  39        struct commit_list *mark_list;
  40        unsigned long mark_limit;
  41        struct cmd_reflog_expire_cb *cmd;
  42        unsigned char last_kept_sha1[20];
  43};
  44
  45struct collected_reflog {
  46        unsigned char sha1[20];
  47        char reflog[FLEX_ARRAY];
  48};
  49struct collect_reflog_cb {
  50        struct collected_reflog **e;
  51        int alloc;
  52        int nr;
  53};
  54
  55#define INCOMPLETE      (1u<<10)
  56#define STUDYING        (1u<<11)
  57#define REACHABLE       (1u<<12)
  58
  59static int tree_is_complete(const unsigned char *sha1)
  60{
  61        struct tree_desc desc;
  62        struct name_entry entry;
  63        int complete;
  64        struct tree *tree;
  65
  66        tree = lookup_tree(sha1);
  67        if (!tree)
  68                return 0;
  69        if (tree->object.flags & SEEN)
  70                return 1;
  71        if (tree->object.flags & INCOMPLETE)
  72                return 0;
  73
  74        if (!tree->buffer) {
  75                enum object_type type;
  76                unsigned long size;
  77                void *data = read_sha1_file(sha1, &type, &size);
  78                if (!data) {
  79                        tree->object.flags |= INCOMPLETE;
  80                        return 0;
  81                }
  82                tree->buffer = data;
  83                tree->size = size;
  84        }
  85        init_tree_desc(&desc, tree->buffer, tree->size);
  86        complete = 1;
  87        while (tree_entry(&desc, &entry)) {
  88                if (!has_sha1_file(entry.sha1) ||
  89                    (S_ISDIR(entry.mode) && !tree_is_complete(entry.sha1))) {
  90                        tree->object.flags |= INCOMPLETE;
  91                        complete = 0;
  92                }
  93        }
  94        free(tree->buffer);
  95        tree->buffer = NULL;
  96
  97        if (complete)
  98                tree->object.flags |= SEEN;
  99        return complete;
 100}
 101
 102static int commit_is_complete(struct commit *commit)
 103{
 104        struct object_array study;
 105        struct object_array found;
 106        int is_incomplete = 0;
 107        int i;
 108
 109        /* early return */
 110        if (commit->object.flags & SEEN)
 111                return 1;
 112        if (commit->object.flags & INCOMPLETE)
 113                return 0;
 114        /*
 115         * Find all commits that are reachable and are not marked as
 116         * SEEN.  Then make sure the trees and blobs contained are
 117         * complete.  After that, mark these commits also as SEEN.
 118         * If some of the objects that are needed to complete this
 119         * commit are missing, mark this commit as INCOMPLETE.
 120         */
 121        memset(&study, 0, sizeof(study));
 122        memset(&found, 0, sizeof(found));
 123        add_object_array(&commit->object, NULL, &study);
 124        add_object_array(&commit->object, NULL, &found);
 125        commit->object.flags |= STUDYING;
 126        while (study.nr) {
 127                struct commit *c;
 128                struct commit_list *parent;
 129
 130                c = (struct commit *)study.objects[--study.nr].item;
 131                if (!c->object.parsed && !parse_object(c->object.sha1))
 132                        c->object.flags |= INCOMPLETE;
 133
 134                if (c->object.flags & INCOMPLETE) {
 135                        is_incomplete = 1;
 136                        break;
 137                }
 138                else if (c->object.flags & SEEN)
 139                        continue;
 140                for (parent = c->parents; parent; parent = parent->next) {
 141                        struct commit *p = parent->item;
 142                        if (p->object.flags & STUDYING)
 143                                continue;
 144                        p->object.flags |= STUDYING;
 145                        add_object_array(&p->object, NULL, &study);
 146                        add_object_array(&p->object, NULL, &found);
 147                }
 148        }
 149        if (!is_incomplete) {
 150                /*
 151                 * make sure all commits in "found" array have all the
 152                 * necessary objects.
 153                 */
 154                for (i = 0; i < found.nr; i++) {
 155                        struct commit *c =
 156                                (struct commit *)found.objects[i].item;
 157                        if (!tree_is_complete(c->tree->object.sha1)) {
 158                                is_incomplete = 1;
 159                                c->object.flags |= INCOMPLETE;
 160                        }
 161                }
 162                if (!is_incomplete) {
 163                        /* mark all found commits as complete, iow SEEN */
 164                        for (i = 0; i < found.nr; i++)
 165                                found.objects[i].item->flags |= SEEN;
 166                }
 167        }
 168        /* clear flags from the objects we traversed */
 169        for (i = 0; i < found.nr; i++)
 170                found.objects[i].item->flags &= ~STUDYING;
 171        if (is_incomplete)
 172                commit->object.flags |= INCOMPLETE;
 173        else {
 174                /*
 175                 * If we come here, we have (1) traversed the ancestry chain
 176                 * from the "commit" until we reach SEEN commits (which are
 177                 * known to be complete), and (2) made sure that the commits
 178                 * encountered during the above traversal refer to trees that
 179                 * are complete.  Which means that we know *all* the commits
 180                 * we have seen during this process are complete.
 181                 */
 182                for (i = 0; i < found.nr; i++)
 183                        found.objects[i].item->flags |= SEEN;
 184        }
 185        /* free object arrays */
 186        free(study.objects);
 187        free(found.objects);
 188        return !is_incomplete;
 189}
 190
 191static int keep_entry(struct commit **it, unsigned char *sha1)
 192{
 193        struct commit *commit;
 194
 195        if (is_null_sha1(sha1))
 196                return 1;
 197        commit = lookup_commit_reference_gently(sha1, 1);
 198        if (!commit)
 199                return 0;
 200
 201        /*
 202         * Make sure everything in this commit exists.
 203         *
 204         * We have walked all the objects reachable from the refs
 205         * and cache earlier.  The commits reachable by this commit
 206         * must meet SEEN commits -- and then we should mark them as
 207         * SEEN as well.
 208         */
 209        if (!commit_is_complete(commit))
 210                return 0;
 211        *it = commit;
 212        return 1;
 213}
 214
 215/*
 216 * Starting from commits in the cb->mark_list, mark commits that are
 217 * reachable from them.  Stop the traversal at commits older than
 218 * the expire_limit and queue them back, so that the caller can call
 219 * us again to restart the traversal with longer expire_limit.
 220 */
 221static void mark_reachable(struct expire_reflog_cb *cb)
 222{
 223        struct commit *commit;
 224        struct commit_list *pending;
 225        unsigned long expire_limit = cb->mark_limit;
 226        struct commit_list *leftover = NULL;
 227
 228        for (pending = cb->mark_list; pending; pending = pending->next)
 229                pending->item->object.flags &= ~REACHABLE;
 230
 231        pending = cb->mark_list;
 232        while (pending) {
 233                struct commit_list *entry = pending;
 234                struct commit_list *parent;
 235                pending = entry->next;
 236                commit = entry->item;
 237                free(entry);
 238                if (commit->object.flags & REACHABLE)
 239                        continue;
 240                if (parse_commit(commit))
 241                        continue;
 242                commit->object.flags |= REACHABLE;
 243                if (commit->date < expire_limit) {
 244                        commit_list_insert(commit, &leftover);
 245                        continue;
 246                }
 247                commit->object.flags |= REACHABLE;
 248                parent = commit->parents;
 249                while (parent) {
 250                        commit = parent->item;
 251                        parent = parent->next;
 252                        if (commit->object.flags & REACHABLE)
 253                                continue;
 254                        commit_list_insert(commit, &pending);
 255                }
 256        }
 257        cb->mark_list = leftover;
 258}
 259
 260static int unreachable(struct expire_reflog_cb *cb, struct commit *commit, unsigned char *sha1)
 261{
 262        /*
 263         * We may or may not have the commit yet - if not, look it
 264         * up using the supplied sha1.
 265         */
 266        if (!commit) {
 267                if (is_null_sha1(sha1))
 268                        return 0;
 269
 270                commit = lookup_commit_reference_gently(sha1, 1);
 271
 272                /* Not a commit -- keep it */
 273                if (!commit)
 274                        return 0;
 275        }
 276
 277        /* Reachable from the current ref?  Don't prune. */
 278        if (commit->object.flags & REACHABLE)
 279                return 0;
 280
 281        if (cb->mark_list && cb->mark_limit) {
 282                cb->mark_limit = 0; /* dig down to the root */
 283                mark_reachable(cb);
 284        }
 285
 286        return !(commit->object.flags & REACHABLE);
 287}
 288
 289static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 290                const char *email, unsigned long timestamp, int tz,
 291                const char *message, void *cb_data)
 292{
 293        struct expire_reflog_cb *cb = cb_data;
 294        struct commit *old, *new;
 295
 296        if (timestamp < cb->cmd->expire_total)
 297                goto prune;
 298
 299        if (cb->cmd->rewrite)
 300                osha1 = cb->last_kept_sha1;
 301
 302        old = new = NULL;
 303        if (cb->cmd->stalefix &&
 304            (!keep_entry(&old, osha1) || !keep_entry(&new, nsha1)))
 305                goto prune;
 306
 307        if (timestamp < cb->cmd->expire_unreachable) {
 308                if (!cb->ref_commit)
 309                        goto prune;
 310                if (unreachable(cb, old, osha1) || unreachable(cb, new, nsha1))
 311                        goto prune;
 312        }
 313
 314        if (cb->cmd->recno && --(cb->cmd->recno) == 0)
 315                goto prune;
 316
 317        if (cb->newlog) {
 318                char sign = (tz < 0) ? '-' : '+';
 319                int zone = (tz < 0) ? (-tz) : tz;
 320                fprintf(cb->newlog, "%s %s %s %lu %c%04d\t%s",
 321                        sha1_to_hex(osha1), sha1_to_hex(nsha1),
 322                        email, timestamp, sign, zone,
 323                        message);
 324                hashcpy(cb->last_kept_sha1, nsha1);
 325        }
 326        if (cb->cmd->verbose)
 327                printf("keep %s", message);
 328        return 0;
 329 prune:
 330        if (!cb->newlog || cb->cmd->verbose)
 331                printf("%sprune %s", cb->newlog ? "" : "would ", message);
 332        return 0;
 333}
 334
 335static int expire_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data)
 336{
 337        struct cmd_reflog_expire_cb *cmd = cb_data;
 338        struct expire_reflog_cb cb;
 339        struct ref_lock *lock;
 340        char *log_file, *newlog_path = NULL;
 341        int status = 0;
 342
 343        memset(&cb, 0, sizeof(cb));
 344
 345        /*
 346         * we take the lock for the ref itself to prevent it from
 347         * getting updated.
 348         */
 349        lock = lock_any_ref_for_update(ref, sha1, 0);
 350        if (!lock)
 351                return error("cannot lock ref '%s'", ref);
 352        log_file = git_pathdup("logs/%s", ref);
 353        if (!file_exists(log_file))
 354                goto finish;
 355        if (!cmd->dry_run) {
 356                newlog_path = git_pathdup("logs/%s.lock", ref);
 357                cb.newlog = fopen(newlog_path, "w");
 358        }
 359
 360        cb.ref_commit = lookup_commit_reference_gently(sha1, 1);
 361        cb.ref = ref;
 362        cb.cmd = cmd;
 363        if (cb.ref_commit) {
 364                cb.mark_list = NULL;
 365                commit_list_insert(cb.ref_commit, &cb.mark_list);
 366                cb.mark_limit = cmd->expire_total;
 367                mark_reachable(&cb);
 368        }
 369        for_each_reflog_ent(ref, expire_reflog_ent, &cb);
 370        if (cb.ref_commit)
 371                clear_commit_marks(cb.ref_commit, REACHABLE);
 372 finish:
 373        if (cb.newlog) {
 374                if (fclose(cb.newlog)) {
 375                        status |= error("%s: %s", strerror(errno),
 376                                        newlog_path);
 377                        unlink(newlog_path);
 378                } else if (cmd->updateref &&
 379                        (write_in_full(lock->lock_fd,
 380                                sha1_to_hex(cb.last_kept_sha1), 40) != 40 ||
 381                         write_str_in_full(lock->lock_fd, "\n") != 1 ||
 382                         close_ref(lock) < 0)) {
 383                        status |= error("Couldn't write %s",
 384                                lock->lk->filename);
 385                        unlink(newlog_path);
 386                } else if (rename(newlog_path, log_file)) {
 387                        status |= error("cannot rename %s to %s",
 388                                        newlog_path, log_file);
 389                        unlink(newlog_path);
 390                } else if (cmd->updateref && commit_ref(lock)) {
 391                        status |= error("Couldn't set %s", lock->ref_name);
 392                } else {
 393                        adjust_shared_perm(log_file);
 394                }
 395        }
 396        free(newlog_path);
 397        free(log_file);
 398        unlock_ref(lock);
 399        return status;
 400}
 401
 402static int collect_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data)
 403{
 404        struct collected_reflog *e;
 405        struct collect_reflog_cb *cb = cb_data;
 406        size_t namelen = strlen(ref);
 407
 408        e = xmalloc(sizeof(*e) + namelen + 1);
 409        hashcpy(e->sha1, sha1);
 410        memcpy(e->reflog, ref, namelen + 1);
 411        ALLOC_GROW(cb->e, cb->nr + 1, cb->alloc);
 412        cb->e[cb->nr++] = e;
 413        return 0;
 414}
 415
 416static struct reflog_expire_cfg {
 417        struct reflog_expire_cfg *next;
 418        unsigned long expire_total;
 419        unsigned long expire_unreachable;
 420        size_t len;
 421        char pattern[FLEX_ARRAY];
 422} *reflog_expire_cfg, **reflog_expire_cfg_tail;
 423
 424static struct reflog_expire_cfg *find_cfg_ent(const char *pattern, size_t len)
 425{
 426        struct reflog_expire_cfg *ent;
 427
 428        if (!reflog_expire_cfg_tail)
 429                reflog_expire_cfg_tail = &reflog_expire_cfg;
 430
 431        for (ent = reflog_expire_cfg; ent; ent = ent->next)
 432                if (ent->len == len &&
 433                    !memcmp(ent->pattern, pattern, len))
 434                        return ent;
 435
 436        ent = xcalloc(1, (sizeof(*ent) + len));
 437        memcpy(ent->pattern, pattern, len);
 438        ent->len = len;
 439        *reflog_expire_cfg_tail = ent;
 440        reflog_expire_cfg_tail = &(ent->next);
 441        return ent;
 442}
 443
 444static int parse_expire_cfg_value(const char *var, const char *value, unsigned long *expire)
 445{
 446        if (!value)
 447                return config_error_nonbool(var);
 448        if (!strcmp(value, "never") || !strcmp(value, "false")) {
 449                *expire = 0;
 450                return 0;
 451        }
 452        *expire = approxidate(value);
 453        return 0;
 454}
 455
 456/* expiry timer slot */
 457#define EXPIRE_TOTAL   01
 458#define EXPIRE_UNREACH 02
 459
 460static int reflog_expire_config(const char *var, const char *value, void *cb)
 461{
 462        const char *lastdot = strrchr(var, '.');
 463        unsigned long expire;
 464        int slot;
 465        struct reflog_expire_cfg *ent;
 466
 467        if (!lastdot || prefixcmp(var, "gc."))
 468                return git_default_config(var, value, cb);
 469
 470        if (!strcmp(lastdot, ".reflogexpire")) {
 471                slot = EXPIRE_TOTAL;
 472                if (parse_expire_cfg_value(var, value, &expire))
 473                        return -1;
 474        } else if (!strcmp(lastdot, ".reflogexpireunreachable")) {
 475                slot = EXPIRE_UNREACH;
 476                if (parse_expire_cfg_value(var, value, &expire))
 477                        return -1;
 478        } else
 479                return git_default_config(var, value, cb);
 480
 481        if (lastdot == var + 2) {
 482                switch (slot) {
 483                case EXPIRE_TOTAL:
 484                        default_reflog_expire = expire;
 485                        break;
 486                case EXPIRE_UNREACH:
 487                        default_reflog_expire_unreachable = expire;
 488                        break;
 489                }
 490                return 0;
 491        }
 492
 493        ent = find_cfg_ent(var + 3, lastdot - (var+3));
 494        if (!ent)
 495                return -1;
 496        switch (slot) {
 497        case EXPIRE_TOTAL:
 498                ent->expire_total = expire;
 499                break;
 500        case EXPIRE_UNREACH:
 501                ent->expire_unreachable = expire;
 502                break;
 503        }
 504        return 0;
 505}
 506
 507static void set_reflog_expiry_param(struct cmd_reflog_expire_cb *cb, int slot, const char *ref)
 508{
 509        struct reflog_expire_cfg *ent;
 510
 511        if (slot == (EXPIRE_TOTAL|EXPIRE_UNREACH))
 512                return; /* both given explicitly -- nothing to tweak */
 513
 514        for (ent = reflog_expire_cfg; ent; ent = ent->next) {
 515                if (!fnmatch(ent->pattern, ref, 0)) {
 516                        if (!(slot & EXPIRE_TOTAL))
 517                                cb->expire_total = ent->expire_total;
 518                        if (!(slot & EXPIRE_UNREACH))
 519                                cb->expire_unreachable = ent->expire_unreachable;
 520                        return;
 521                }
 522        }
 523
 524        /*
 525         * If unconfigured, make stash never expire
 526         */
 527        if (!strcmp(ref, "refs/stash")) {
 528                if (!(slot & EXPIRE_TOTAL))
 529                        cb->expire_total = 0;
 530                if (!(slot & EXPIRE_UNREACH))
 531                        cb->expire_unreachable = 0;
 532                return;
 533        }
 534
 535        /* Nothing matched -- use the default value */
 536        if (!(slot & EXPIRE_TOTAL))
 537                cb->expire_total = default_reflog_expire;
 538        if (!(slot & EXPIRE_UNREACH))
 539                cb->expire_unreachable = default_reflog_expire_unreachable;
 540}
 541
 542static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
 543{
 544        struct cmd_reflog_expire_cb cb;
 545        unsigned long now = time(NULL);
 546        int i, status, do_all;
 547        int explicit_expiry = 0;
 548
 549        default_reflog_expire_unreachable = now - 30 * 24 * 3600;
 550        default_reflog_expire = now - 90 * 24 * 3600;
 551        git_config(reflog_expire_config, NULL);
 552
 553        save_commit_buffer = 0;
 554        do_all = status = 0;
 555        memset(&cb, 0, sizeof(cb));
 556
 557        cb.expire_total = default_reflog_expire;
 558        cb.expire_unreachable = default_reflog_expire_unreachable;
 559
 560        for (i = 1; i < argc; i++) {
 561                const char *arg = argv[i];
 562                if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
 563                        cb.dry_run = 1;
 564                else if (!prefixcmp(arg, "--expire=")) {
 565                        cb.expire_total = approxidate(arg + 9);
 566                        explicit_expiry |= EXPIRE_TOTAL;
 567                }
 568                else if (!prefixcmp(arg, "--expire-unreachable=")) {
 569                        cb.expire_unreachable = approxidate(arg + 21);
 570                        explicit_expiry |= EXPIRE_UNREACH;
 571                }
 572                else if (!strcmp(arg, "--stale-fix"))
 573                        cb.stalefix = 1;
 574                else if (!strcmp(arg, "--rewrite"))
 575                        cb.rewrite = 1;
 576                else if (!strcmp(arg, "--updateref"))
 577                        cb.updateref = 1;
 578                else if (!strcmp(arg, "--all"))
 579                        do_all = 1;
 580                else if (!strcmp(arg, "--verbose"))
 581                        cb.verbose = 1;
 582                else if (!strcmp(arg, "--")) {
 583                        i++;
 584                        break;
 585                }
 586                else if (arg[0] == '-')
 587                        usage(reflog_expire_usage);
 588                else
 589                        break;
 590        }
 591
 592        /*
 593         * We can trust the commits and objects reachable from refs
 594         * even in older repository.  We cannot trust what's reachable
 595         * from reflog if the repository was pruned with older git.
 596         */
 597        if (cb.stalefix) {
 598                init_revisions(&cb.revs, prefix);
 599                if (cb.verbose)
 600                        printf("Marking reachable objects...");
 601                mark_reachable_objects(&cb.revs, 0);
 602                if (cb.verbose)
 603                        putchar('\n');
 604        }
 605
 606        if (do_all) {
 607                struct collect_reflog_cb collected;
 608                int i;
 609
 610                memset(&collected, 0, sizeof(collected));
 611                for_each_reflog(collect_reflog, &collected);
 612                for (i = 0; i < collected.nr; i++) {
 613                        struct collected_reflog *e = collected.e[i];
 614                        set_reflog_expiry_param(&cb, explicit_expiry, e->reflog);
 615                        status |= expire_reflog(e->reflog, e->sha1, 0, &cb);
 616                        free(e);
 617                }
 618                free(collected.e);
 619        }
 620
 621        for (; i < argc; i++) {
 622                char *ref;
 623                unsigned char sha1[20];
 624                if (!dwim_log(argv[i], strlen(argv[i]), sha1, &ref)) {
 625                        status |= error("%s points nowhere!", argv[i]);
 626                        continue;
 627                }
 628                set_reflog_expiry_param(&cb, explicit_expiry, ref);
 629                status |= expire_reflog(ref, sha1, 0, &cb);
 630        }
 631        return status;
 632}
 633
 634static int count_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 635                const char *email, unsigned long timestamp, int tz,
 636                const char *message, void *cb_data)
 637{
 638        struct cmd_reflog_expire_cb *cb = cb_data;
 639        if (!cb->expire_total || timestamp < cb->expire_total)
 640                cb->recno++;
 641        return 0;
 642}
 643
 644static int cmd_reflog_delete(int argc, const char **argv, const char *prefix)
 645{
 646        struct cmd_reflog_expire_cb cb;
 647        int i, status = 0;
 648
 649        memset(&cb, 0, sizeof(cb));
 650
 651        for (i = 1; i < argc; i++) {
 652                const char *arg = argv[i];
 653                if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
 654                        cb.dry_run = 1;
 655                else if (!strcmp(arg, "--rewrite"))
 656                        cb.rewrite = 1;
 657                else if (!strcmp(arg, "--updateref"))
 658                        cb.updateref = 1;
 659                else if (!strcmp(arg, "--verbose"))
 660                        cb.verbose = 1;
 661                else if (!strcmp(arg, "--")) {
 662                        i++;
 663                        break;
 664                }
 665                else if (arg[0] == '-')
 666                        usage(reflog_delete_usage);
 667                else
 668                        break;
 669        }
 670
 671        if (argc - i < 1)
 672                return error("Nothing to delete?");
 673
 674        for ( ; i < argc; i++) {
 675                const char *spec = strstr(argv[i], "@{");
 676                unsigned char sha1[20];
 677                char *ep, *ref;
 678                int recno;
 679
 680                if (!spec) {
 681                        status |= error("Not a reflog: %s", argv[i]);
 682                        continue;
 683                }
 684
 685                if (!dwim_log(argv[i], spec - argv[i], sha1, &ref)) {
 686                        status |= error("no reflog for '%s'", argv[i]);
 687                        continue;
 688                }
 689
 690                recno = strtoul(spec + 2, &ep, 10);
 691                if (*ep == '}') {
 692                        cb.recno = -recno;
 693                        for_each_reflog_ent(ref, count_reflog_ent, &cb);
 694                } else {
 695                        cb.expire_total = approxidate(spec + 2);
 696                        for_each_reflog_ent(ref, count_reflog_ent, &cb);
 697                        cb.expire_total = 0;
 698                }
 699
 700                status |= expire_reflog(ref, sha1, 0, &cb);
 701                free(ref);
 702        }
 703        return status;
 704}
 705
 706/*
 707 * main "reflog"
 708 */
 709
 710static const char reflog_usage[] =
 711"git reflog [ show | expire | delete ]";
 712
 713int cmd_reflog(int argc, const char **argv, const char *prefix)
 714{
 715        if (argc > 1 && !strcmp(argv[1], "-h"))
 716                usage(reflog_usage);
 717
 718        /* With no command, we default to showing it. */
 719        if (argc < 2 || *argv[1] == '-')
 720                return cmd_log_reflog(argc, argv, prefix);
 721
 722        if (!strcmp(argv[1], "show"))
 723                return cmd_log_reflog(argc - 1, argv + 1, prefix);
 724
 725        if (!strcmp(argv[1], "expire"))
 726                return cmd_reflog_expire(argc - 1, argv + 1, prefix);
 727
 728        if (!strcmp(argv[1], "delete"))
 729                return cmd_reflog_delete(argc - 1, argv + 1, prefix);
 730
 731        /* Not a recognized reflog command..*/
 732        usage(reflog_usage);
 733}