Andrew's git / gitweb.git / builtin/reflog.c
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builtin / reflog.con commit Merge branch 'ds/doc-two-kinds-of-tags' (652d2bf)
   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        enum {
  38                UE_NORMAL,
  39                UE_ALWAYS,
  40                UE_HEAD
  41        } unreachable_expire_kind;
  42        struct commit_list *mark_list;
  43        unsigned long mark_limit;
  44        struct cmd_reflog_expire_cb *cmd;
  45        unsigned char last_kept_sha1[20];
  46};
  47
  48struct collected_reflog {
  49        unsigned char sha1[20];
  50        char reflog[FLEX_ARRAY];
  51};
  52struct collect_reflog_cb {
  53        struct collected_reflog **e;
  54        int alloc;
  55        int nr;
  56};
  57
  58#define INCOMPLETE      (1u<<10)
  59#define STUDYING        (1u<<11)
  60#define REACHABLE       (1u<<12)
  61
  62static int tree_is_complete(const unsigned char *sha1)
  63{
  64        struct tree_desc desc;
  65        struct name_entry entry;
  66        int complete;
  67        struct tree *tree;
  68
  69        tree = lookup_tree(sha1);
  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_sha1_file(sha1, &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.sha1) ||
  92                    (S_ISDIR(entry.mode) && !tree_is_complete(entry.sha1))) {
  93                        tree->object.flags |= INCOMPLETE;
  94                        complete = 0;
  95                }
  96        }
  97        free(tree->buffer);
  98        tree->buffer = NULL;
  99
 100        if (complete)
 101                tree->object.flags |= SEEN;
 102        return complete;
 103}
 104
 105static int commit_is_complete(struct commit *commit)
 106{
 107        struct object_array study;
 108        struct object_array found;
 109        int is_incomplete = 0;
 110        int i;
 111
 112        /* early return */
 113        if (commit->object.flags & SEEN)
 114                return 1;
 115        if (commit->object.flags & INCOMPLETE)
 116                return 0;
 117        /*
 118         * Find all commits that are reachable and are not marked as
 119         * SEEN.  Then make sure the trees and blobs contained are
 120         * complete.  After that, mark these commits also as SEEN.
 121         * If some of the objects that are needed to complete this
 122         * commit are missing, mark this commit as INCOMPLETE.
 123         */
 124        memset(&study, 0, sizeof(study));
 125        memset(&found, 0, sizeof(found));
 126        add_object_array(&commit->object, NULL, &study);
 127        add_object_array(&commit->object, NULL, &found);
 128        commit->object.flags |= STUDYING;
 129        while (study.nr) {
 130                struct commit *c;
 131                struct commit_list *parent;
 132
 133                c = (struct commit *)study.objects[--study.nr].item;
 134                if (!c->object.parsed && !parse_object(c->object.sha1))
 135                        c->object.flags |= INCOMPLETE;
 136
 137                if (c->object.flags & INCOMPLETE) {
 138                        is_incomplete = 1;
 139                        break;
 140                }
 141                else if (c->object.flags & SEEN)
 142                        continue;
 143                for (parent = c->parents; parent; parent = parent->next) {
 144                        struct commit *p = parent->item;
 145                        if (p->object.flags & STUDYING)
 146                                continue;
 147                        p->object.flags |= STUDYING;
 148                        add_object_array(&p->object, NULL, &study);
 149                        add_object_array(&p->object, NULL, &found);
 150                }
 151        }
 152        if (!is_incomplete) {
 153                /*
 154                 * make sure all commits in "found" array have all the
 155                 * necessary objects.
 156                 */
 157                for (i = 0; i < found.nr; i++) {
 158                        struct commit *c =
 159                                (struct commit *)found.objects[i].item;
 160                        if (!tree_is_complete(c->tree->object.sha1)) {
 161                                is_incomplete = 1;
 162                                c->object.flags |= INCOMPLETE;
 163                        }
 164                }
 165                if (!is_incomplete) {
 166                        /* mark all found commits as complete, iow SEEN */
 167                        for (i = 0; i < found.nr; i++)
 168                                found.objects[i].item->flags |= SEEN;
 169                }
 170        }
 171        /* clear flags from the objects we traversed */
 172        for (i = 0; i < found.nr; i++)
 173                found.objects[i].item->flags &= ~STUDYING;
 174        if (is_incomplete)
 175                commit->object.flags |= INCOMPLETE;
 176        else {
 177                /*
 178                 * If we come here, we have (1) traversed the ancestry chain
 179                 * from the "commit" until we reach SEEN commits (which are
 180                 * known to be complete), and (2) made sure that the commits
 181                 * encountered during the above traversal refer to trees that
 182                 * are complete.  Which means that we know *all* the commits
 183                 * we have seen during this process are complete.
 184                 */
 185                for (i = 0; i < found.nr; i++)
 186                        found.objects[i].item->flags |= SEEN;
 187        }
 188        /* free object arrays */
 189        free(study.objects);
 190        free(found.objects);
 191        return !is_incomplete;
 192}
 193
 194static int keep_entry(struct commit **it, unsigned char *sha1)
 195{
 196        struct commit *commit;
 197
 198        if (is_null_sha1(sha1))
 199                return 1;
 200        commit = lookup_commit_reference_gently(sha1, 1);
 201        if (!commit)
 202                return 0;
 203
 204        /*
 205         * Make sure everything in this commit exists.
 206         *
 207         * We have walked all the objects reachable from the refs
 208         * and cache earlier.  The commits reachable by this commit
 209         * must meet SEEN commits -- and then we should mark them as
 210         * SEEN as well.
 211         */
 212        if (!commit_is_complete(commit))
 213                return 0;
 214        *it = commit;
 215        return 1;
 216}
 217
 218/*
 219 * Starting from commits in the cb->mark_list, mark commits that are
 220 * reachable from them.  Stop the traversal at commits older than
 221 * the expire_limit and queue them back, so that the caller can call
 222 * us again to restart the traversal with longer expire_limit.
 223 */
 224static void mark_reachable(struct expire_reflog_cb *cb)
 225{
 226        struct commit *commit;
 227        struct commit_list *pending;
 228        unsigned long expire_limit = cb->mark_limit;
 229        struct commit_list *leftover = NULL;
 230
 231        for (pending = cb->mark_list; pending; pending = pending->next)
 232                pending->item->object.flags &= ~REACHABLE;
 233
 234        pending = cb->mark_list;
 235        while (pending) {
 236                struct commit_list *entry = pending;
 237                struct commit_list *parent;
 238                pending = entry->next;
 239                commit = entry->item;
 240                free(entry);
 241                if (commit->object.flags & REACHABLE)
 242                        continue;
 243                if (parse_commit(commit))
 244                        continue;
 245                commit->object.flags |= REACHABLE;
 246                if (commit->date < expire_limit) {
 247                        commit_list_insert(commit, &leftover);
 248                        continue;
 249                }
 250                commit->object.flags |= REACHABLE;
 251                parent = commit->parents;
 252                while (parent) {
 253                        commit = parent->item;
 254                        parent = parent->next;
 255                        if (commit->object.flags & REACHABLE)
 256                                continue;
 257                        commit_list_insert(commit, &pending);
 258                }
 259        }
 260        cb->mark_list = leftover;
 261}
 262
 263static int unreachable(struct expire_reflog_cb *cb, struct commit *commit, unsigned char *sha1)
 264{
 265        /*
 266         * We may or may not have the commit yet - if not, look it
 267         * up using the supplied sha1.
 268         */
 269        if (!commit) {
 270                if (is_null_sha1(sha1))
 271                        return 0;
 272
 273                commit = lookup_commit_reference_gently(sha1, 1);
 274
 275                /* Not a commit -- keep it */
 276                if (!commit)
 277                        return 0;
 278        }
 279
 280        /* Reachable from the current ref?  Don't prune. */
 281        if (commit->object.flags & REACHABLE)
 282                return 0;
 283
 284        if (cb->mark_list && cb->mark_limit) {
 285                cb->mark_limit = 0; /* dig down to the root */
 286                mark_reachable(cb);
 287        }
 288
 289        return !(commit->object.flags & REACHABLE);
 290}
 291
 292static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 293                const char *email, unsigned long timestamp, int tz,
 294                const char *message, void *cb_data)
 295{
 296        struct expire_reflog_cb *cb = cb_data;
 297        struct commit *old, *new;
 298
 299        if (timestamp < cb->cmd->expire_total)
 300                goto prune;
 301
 302        if (cb->cmd->rewrite)
 303                osha1 = cb->last_kept_sha1;
 304
 305        old = new = NULL;
 306        if (cb->cmd->stalefix &&
 307            (!keep_entry(&old, osha1) || !keep_entry(&new, nsha1)))
 308                goto prune;
 309
 310        if (timestamp < cb->cmd->expire_unreachable) {
 311                if (cb->unreachable_expire_kind == UE_ALWAYS)
 312                        goto prune;
 313                if (unreachable(cb, old, osha1) || unreachable(cb, new, nsha1))
 314                        goto prune;
 315        }
 316
 317        if (cb->cmd->recno && --(cb->cmd->recno) == 0)
 318                goto prune;
 319
 320        if (cb->newlog) {
 321                char sign = (tz < 0) ? '-' : '+';
 322                int zone = (tz < 0) ? (-tz) : tz;
 323                fprintf(cb->newlog, "%s %s %s %lu %c%04d\t%s",
 324                        sha1_to_hex(osha1), sha1_to_hex(nsha1),
 325                        email, timestamp, sign, zone,
 326                        message);
 327                hashcpy(cb->last_kept_sha1, nsha1);
 328        }
 329        if (cb->cmd->verbose)
 330                printf("keep %s", message);
 331        return 0;
 332 prune:
 333        if (!cb->newlog)
 334                printf("would prune %s", message);
 335        else if (cb->cmd->verbose)
 336                printf("prune %s", message);
 337        return 0;
 338}
 339
 340static int push_tip_to_list(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
 341{
 342        struct commit_list **list = cb_data;
 343        struct commit *tip_commit;
 344        if (flags & REF_ISSYMREF)
 345                return 0;
 346        tip_commit = lookup_commit_reference_gently(sha1, 1);
 347        if (!tip_commit)
 348                return 0;
 349        commit_list_insert(tip_commit, list);
 350        return 0;
 351}
 352
 353static int expire_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data)
 354{
 355        struct cmd_reflog_expire_cb *cmd = cb_data;
 356        struct expire_reflog_cb cb;
 357        struct ref_lock *lock;
 358        char *log_file, *newlog_path = NULL;
 359        struct commit *tip_commit;
 360        struct commit_list *tips;
 361        int status = 0;
 362
 363        memset(&cb, 0, sizeof(cb));
 364
 365        /*
 366         * we take the lock for the ref itself to prevent it from
 367         * getting updated.
 368         */
 369        lock = lock_any_ref_for_update(ref, sha1, 0);
 370        if (!lock)
 371                return error("cannot lock ref '%s'", ref);
 372        log_file = git_pathdup("logs/%s", ref);
 373        if (!file_exists(log_file))
 374                goto finish;
 375        if (!cmd->dry_run) {
 376                newlog_path = git_pathdup("logs/%s.lock", ref);
 377                cb.newlog = fopen(newlog_path, "w");
 378        }
 379
 380        cb.cmd = cmd;
 381
 382        if (!cmd->expire_unreachable || !strcmp(ref, "HEAD")) {
 383                tip_commit = NULL;
 384                cb.unreachable_expire_kind = UE_HEAD;
 385        } else {
 386                tip_commit = lookup_commit_reference_gently(sha1, 1);
 387                if (!tip_commit)
 388                        cb.unreachable_expire_kind = UE_ALWAYS;
 389                else
 390                        cb.unreachable_expire_kind = UE_NORMAL;
 391        }
 392
 393        if (cmd->expire_unreachable <= cmd->expire_total)
 394                cb.unreachable_expire_kind = UE_ALWAYS;
 395
 396        cb.mark_list = NULL;
 397        tips = NULL;
 398        if (cb.unreachable_expire_kind != UE_ALWAYS) {
 399                if (cb.unreachable_expire_kind == UE_HEAD) {
 400                        struct commit_list *elem;
 401                        for_each_ref(push_tip_to_list, &tips);
 402                        for (elem = tips; elem; elem = elem->next)
 403                                commit_list_insert(elem->item, &cb.mark_list);
 404                } else {
 405                        commit_list_insert(tip_commit, &cb.mark_list);
 406                }
 407                cb.mark_limit = cmd->expire_total;
 408                mark_reachable(&cb);
 409        }
 410
 411        for_each_reflog_ent(ref, expire_reflog_ent, &cb);
 412
 413        if (cb.unreachable_expire_kind != UE_ALWAYS) {
 414                if (cb.unreachable_expire_kind == UE_HEAD) {
 415                        struct commit_list *elem;
 416                        for (elem = tips; elem; elem = elem->next)
 417                                clear_commit_marks(elem->item, REACHABLE);
 418                        free_commit_list(tips);
 419                } else {
 420                        clear_commit_marks(tip_commit, REACHABLE);
 421                }
 422        }
 423 finish:
 424        if (cb.newlog) {
 425                if (fclose(cb.newlog)) {
 426                        status |= error("%s: %s", strerror(errno),
 427                                        newlog_path);
 428                        unlink(newlog_path);
 429                } else if (cmd->updateref &&
 430                        (write_in_full(lock->lock_fd,
 431                                sha1_to_hex(cb.last_kept_sha1), 40) != 40 ||
 432                         write_str_in_full(lock->lock_fd, "\n") != 1 ||
 433                         close_ref(lock) < 0)) {
 434                        status |= error("Couldn't write %s",
 435                                lock->lk->filename);
 436                        unlink(newlog_path);
 437                } else if (rename(newlog_path, log_file)) {
 438                        status |= error("cannot rename %s to %s",
 439                                        newlog_path, log_file);
 440                        unlink(newlog_path);
 441                } else if (cmd->updateref && commit_ref(lock)) {
 442                        status |= error("Couldn't set %s", lock->ref_name);
 443                } else {
 444                        adjust_shared_perm(log_file);
 445                }
 446        }
 447        free(newlog_path);
 448        free(log_file);
 449        unlock_ref(lock);
 450        return status;
 451}
 452
 453static int collect_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data)
 454{
 455        struct collected_reflog *e;
 456        struct collect_reflog_cb *cb = cb_data;
 457        size_t namelen = strlen(ref);
 458
 459        e = xmalloc(sizeof(*e) + namelen + 1);
 460        hashcpy(e->sha1, sha1);
 461        memcpy(e->reflog, ref, namelen + 1);
 462        ALLOC_GROW(cb->e, cb->nr + 1, cb->alloc);
 463        cb->e[cb->nr++] = e;
 464        return 0;
 465}
 466
 467static struct reflog_expire_cfg {
 468        struct reflog_expire_cfg *next;
 469        unsigned long expire_total;
 470        unsigned long expire_unreachable;
 471        size_t len;
 472        char pattern[FLEX_ARRAY];
 473} *reflog_expire_cfg, **reflog_expire_cfg_tail;
 474
 475static struct reflog_expire_cfg *find_cfg_ent(const char *pattern, size_t len)
 476{
 477        struct reflog_expire_cfg *ent;
 478
 479        if (!reflog_expire_cfg_tail)
 480                reflog_expire_cfg_tail = &reflog_expire_cfg;
 481
 482        for (ent = reflog_expire_cfg; ent; ent = ent->next)
 483                if (ent->len == len &&
 484                    !memcmp(ent->pattern, pattern, len))
 485                        return ent;
 486
 487        ent = xcalloc(1, (sizeof(*ent) + len));
 488        memcpy(ent->pattern, pattern, len);
 489        ent->len = len;
 490        *reflog_expire_cfg_tail = ent;
 491        reflog_expire_cfg_tail = &(ent->next);
 492        return ent;
 493}
 494
 495static int parse_expire_cfg_value(const char *var, const char *value, unsigned long *expire)
 496{
 497        if (!value)
 498                return config_error_nonbool(var);
 499        if (parse_expiry_date(value, expire))
 500                return error(_("%s' for '%s' is not a valid timestamp"),
 501                             value, var);
 502        return 0;
 503}
 504
 505/* expiry timer slot */
 506#define EXPIRE_TOTAL   01
 507#define EXPIRE_UNREACH 02
 508
 509static int reflog_expire_config(const char *var, const char *value, void *cb)
 510{
 511        const char *pattern, *key;
 512        int pattern_len;
 513        unsigned long expire;
 514        int slot;
 515        struct reflog_expire_cfg *ent;
 516
 517        if (parse_config_key(var, "gc", &pattern, &pattern_len, &key) < 0)
 518                return git_default_config(var, value, cb);
 519
 520        if (!strcmp(key, "reflogexpire")) {
 521                slot = EXPIRE_TOTAL;
 522                if (parse_expire_cfg_value(var, value, &expire))
 523                        return -1;
 524        } else if (!strcmp(key, "reflogexpireunreachable")) {
 525                slot = EXPIRE_UNREACH;
 526                if (parse_expire_cfg_value(var, value, &expire))
 527                        return -1;
 528        } else
 529                return git_default_config(var, value, cb);
 530
 531        if (!pattern) {
 532                switch (slot) {
 533                case EXPIRE_TOTAL:
 534                        default_reflog_expire = expire;
 535                        break;
 536                case EXPIRE_UNREACH:
 537                        default_reflog_expire_unreachable = expire;
 538                        break;
 539                }
 540                return 0;
 541        }
 542
 543        ent = find_cfg_ent(pattern, pattern_len);
 544        if (!ent)
 545                return -1;
 546        switch (slot) {
 547        case EXPIRE_TOTAL:
 548                ent->expire_total = expire;
 549                break;
 550        case EXPIRE_UNREACH:
 551                ent->expire_unreachable = expire;
 552                break;
 553        }
 554        return 0;
 555}
 556
 557static void set_reflog_expiry_param(struct cmd_reflog_expire_cb *cb, int slot, const char *ref)
 558{
 559        struct reflog_expire_cfg *ent;
 560
 561        if (slot == (EXPIRE_TOTAL|EXPIRE_UNREACH))
 562                return; /* both given explicitly -- nothing to tweak */
 563
 564        for (ent = reflog_expire_cfg; ent; ent = ent->next) {
 565                if (!fnmatch(ent->pattern, ref, 0)) {
 566                        if (!(slot & EXPIRE_TOTAL))
 567                                cb->expire_total = ent->expire_total;
 568                        if (!(slot & EXPIRE_UNREACH))
 569                                cb->expire_unreachable = ent->expire_unreachable;
 570                        return;
 571                }
 572        }
 573
 574        /*
 575         * If unconfigured, make stash never expire
 576         */
 577        if (!strcmp(ref, "refs/stash")) {
 578                if (!(slot & EXPIRE_TOTAL))
 579                        cb->expire_total = 0;
 580                if (!(slot & EXPIRE_UNREACH))
 581                        cb->expire_unreachable = 0;
 582                return;
 583        }
 584
 585        /* Nothing matched -- use the default value */
 586        if (!(slot & EXPIRE_TOTAL))
 587                cb->expire_total = default_reflog_expire;
 588        if (!(slot & EXPIRE_UNREACH))
 589                cb->expire_unreachable = default_reflog_expire_unreachable;
 590}
 591
 592static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
 593{
 594        struct cmd_reflog_expire_cb cb;
 595        unsigned long now = time(NULL);
 596        int i, status, do_all;
 597        int explicit_expiry = 0;
 598
 599        default_reflog_expire_unreachable = now - 30 * 24 * 3600;
 600        default_reflog_expire = now - 90 * 24 * 3600;
 601        git_config(reflog_expire_config, NULL);
 602
 603        save_commit_buffer = 0;
 604        do_all = status = 0;
 605        memset(&cb, 0, sizeof(cb));
 606
 607        cb.expire_total = default_reflog_expire;
 608        cb.expire_unreachable = default_reflog_expire_unreachable;
 609
 610        for (i = 1; i < argc; i++) {
 611                const char *arg = argv[i];
 612                if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
 613                        cb.dry_run = 1;
 614                else if (!prefixcmp(arg, "--expire=")) {
 615                        if (parse_expiry_date(arg + 9, &cb.expire_total))
 616                                die(_("'%s' is not a valid timestamp"), arg);
 617                        explicit_expiry |= EXPIRE_TOTAL;
 618                }
 619                else if (!prefixcmp(arg, "--expire-unreachable=")) {
 620                        if (parse_expiry_date(arg + 21, &cb.expire_unreachable))
 621                                die(_("'%s' is not a valid timestamp"), arg);
 622                        explicit_expiry |= EXPIRE_UNREACH;
 623                }
 624                else if (!strcmp(arg, "--stale-fix"))
 625                        cb.stalefix = 1;
 626                else if (!strcmp(arg, "--rewrite"))
 627                        cb.rewrite = 1;
 628                else if (!strcmp(arg, "--updateref"))
 629                        cb.updateref = 1;
 630                else if (!strcmp(arg, "--all"))
 631                        do_all = 1;
 632                else if (!strcmp(arg, "--verbose"))
 633                        cb.verbose = 1;
 634                else if (!strcmp(arg, "--")) {
 635                        i++;
 636                        break;
 637                }
 638                else if (arg[0] == '-')
 639                        usage(reflog_expire_usage);
 640                else
 641                        break;
 642        }
 643
 644        /*
 645         * We can trust the commits and objects reachable from refs
 646         * even in older repository.  We cannot trust what's reachable
 647         * from reflog if the repository was pruned with older git.
 648         */
 649        if (cb.stalefix) {
 650                init_revisions(&cb.revs, prefix);
 651                if (cb.verbose)
 652                        printf("Marking reachable objects...");
 653                mark_reachable_objects(&cb.revs, 0, NULL);
 654                if (cb.verbose)
 655                        putchar('\n');
 656        }
 657
 658        if (do_all) {
 659                struct collect_reflog_cb collected;
 660                int i;
 661
 662                memset(&collected, 0, sizeof(collected));
 663                for_each_reflog(collect_reflog, &collected);
 664                for (i = 0; i < collected.nr; i++) {
 665                        struct collected_reflog *e = collected.e[i];
 666                        set_reflog_expiry_param(&cb, explicit_expiry, e->reflog);
 667                        status |= expire_reflog(e->reflog, e->sha1, 0, &cb);
 668                        free(e);
 669                }
 670                free(collected.e);
 671        }
 672
 673        for (; i < argc; i++) {
 674                char *ref;
 675                unsigned char sha1[20];
 676                if (!dwim_log(argv[i], strlen(argv[i]), sha1, &ref)) {
 677                        status |= error("%s points nowhere!", argv[i]);
 678                        continue;
 679                }
 680                set_reflog_expiry_param(&cb, explicit_expiry, ref);
 681                status |= expire_reflog(ref, sha1, 0, &cb);
 682        }
 683        return status;
 684}
 685
 686static int count_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 687                const char *email, unsigned long timestamp, int tz,
 688                const char *message, void *cb_data)
 689{
 690        struct cmd_reflog_expire_cb *cb = cb_data;
 691        if (!cb->expire_total || timestamp < cb->expire_total)
 692                cb->recno++;
 693        return 0;
 694}
 695
 696static int cmd_reflog_delete(int argc, const char **argv, const char *prefix)
 697{
 698        struct cmd_reflog_expire_cb cb;
 699        int i, status = 0;
 700
 701        memset(&cb, 0, sizeof(cb));
 702
 703        for (i = 1; i < argc; i++) {
 704                const char *arg = argv[i];
 705                if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
 706                        cb.dry_run = 1;
 707                else if (!strcmp(arg, "--rewrite"))
 708                        cb.rewrite = 1;
 709                else if (!strcmp(arg, "--updateref"))
 710                        cb.updateref = 1;
 711                else if (!strcmp(arg, "--verbose"))
 712                        cb.verbose = 1;
 713                else if (!strcmp(arg, "--")) {
 714                        i++;
 715                        break;
 716                }
 717                else if (arg[0] == '-')
 718                        usage(reflog_delete_usage);
 719                else
 720                        break;
 721        }
 722
 723        if (argc - i < 1)
 724                return error("Nothing to delete?");
 725
 726        for ( ; i < argc; i++) {
 727                const char *spec = strstr(argv[i], "@{");
 728                unsigned char sha1[20];
 729                char *ep, *ref;
 730                int recno;
 731
 732                if (!spec) {
 733                        status |= error("Not a reflog: %s", argv[i]);
 734                        continue;
 735                }
 736
 737                if (!dwim_log(argv[i], spec - argv[i], sha1, &ref)) {
 738                        status |= error("no reflog for '%s'", argv[i]);
 739                        continue;
 740                }
 741
 742                recno = strtoul(spec + 2, &ep, 10);
 743                if (*ep == '}') {
 744                        cb.recno = -recno;
 745                        for_each_reflog_ent(ref, count_reflog_ent, &cb);
 746                } else {
 747                        cb.expire_total = approxidate(spec + 2);
 748                        for_each_reflog_ent(ref, count_reflog_ent, &cb);
 749                        cb.expire_total = 0;
 750                }
 751
 752                status |= expire_reflog(ref, sha1, 0, &cb);
 753                free(ref);
 754        }
 755        return status;
 756}
 757
 758/*
 759 * main "reflog"
 760 */
 761
 762static const char reflog_usage[] =
 763"git reflog [ show | expire | delete ]";
 764
 765int cmd_reflog(int argc, const char **argv, const char *prefix)
 766{
 767        if (argc > 1 && !strcmp(argv[1], "-h"))
 768                usage(reflog_usage);
 769
 770        /* With no command, we default to showing it. */
 771        if (argc < 2 || *argv[1] == '-')
 772                return cmd_log_reflog(argc, argv, prefix);
 773
 774        if (!strcmp(argv[1], "show"))
 775                return cmd_log_reflog(argc - 1, argv + 1, prefix);
 776
 777        if (!strcmp(argv[1], "expire"))
 778                return cmd_reflog_expire(argc - 1, argv + 1, prefix);
 779
 780        if (!strcmp(argv[1], "delete"))
 781                return cmd_reflog_delete(argc - 1, argv + 1, prefix);
 782
 783        return cmd_log_reflog(argc, argv, prefix);
 784}