Andrew's git / gitweb.git / builtin/reflog.c
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builtin / reflog.con commit Merge branch 'js/t5000-dont-copy-bin-sh' (4762c7b)
   1#include "builtin.h"
   2#include "lockfile.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(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 *)study.objects[--study.nr].item;
 133                if (!c->object.parsed && !parse_object(c->object.sha1))
 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(c->tree->object.sha1)) {
 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        free(study.objects);
 189        free(found.objects);
 190        return !is_incomplete;
 191}
 192
 193static int keep_entry(struct commit **it, unsigned char *sha1)
 194{
 195        struct commit *commit;
 196
 197        if (is_null_sha1(sha1))
 198                return 1;
 199        commit = lookup_commit_reference_gently(sha1, 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_cb *cb)
 224{
 225        struct commit *commit;
 226        struct commit_list *pending;
 227        unsigned long expire_limit = cb->mark_limit;
 228        struct commit_list *leftover = NULL;
 229
 230        for (pending = cb->mark_list; pending; pending = pending->next)
 231                pending->item->object.flags &= ~REACHABLE;
 232
 233        pending = cb->mark_list;
 234        while (pending) {
 235                struct commit_list *entry = pending;
 236                struct commit_list *parent;
 237                pending = entry->next;
 238                commit = entry->item;
 239                free(entry);
 240                if (commit->object.flags & REACHABLE)
 241                        continue;
 242                if (parse_commit(commit))
 243                        continue;
 244                commit->object.flags |= REACHABLE;
 245                if (commit->date < expire_limit) {
 246                        commit_list_insert(commit, &leftover);
 247                        continue;
 248                }
 249                commit->object.flags |= REACHABLE;
 250                parent = commit->parents;
 251                while (parent) {
 252                        commit = parent->item;
 253                        parent = parent->next;
 254                        if (commit->object.flags & REACHABLE)
 255                                continue;
 256                        commit_list_insert(commit, &pending);
 257                }
 258        }
 259        cb->mark_list = leftover;
 260}
 261
 262static int unreachable(struct expire_reflog_cb *cb, struct commit *commit, unsigned char *sha1)
 263{
 264        /*
 265         * We may or may not have the commit yet - if not, look it
 266         * up using the supplied sha1.
 267         */
 268        if (!commit) {
 269                if (is_null_sha1(sha1))
 270                        return 0;
 271
 272                commit = lookup_commit_reference_gently(sha1, 1);
 273
 274                /* Not a commit -- keep it */
 275                if (!commit)
 276                        return 0;
 277        }
 278
 279        /* Reachable from the current ref?  Don't prune. */
 280        if (commit->object.flags & REACHABLE)
 281                return 0;
 282
 283        if (cb->mark_list && cb->mark_limit) {
 284                cb->mark_limit = 0; /* dig down to the root */
 285                mark_reachable(cb);
 286        }
 287
 288        return !(commit->object.flags & REACHABLE);
 289}
 290
 291static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 292                const char *email, unsigned long timestamp, int tz,
 293                const char *message, void *cb_data)
 294{
 295        struct expire_reflog_cb *cb = cb_data;
 296        struct commit *old, *new;
 297
 298        if (timestamp < cb->cmd->expire_total)
 299                goto prune;
 300
 301        if (cb->cmd->rewrite)
 302                osha1 = cb->last_kept_sha1;
 303
 304        old = new = NULL;
 305        if (cb->cmd->stalefix &&
 306            (!keep_entry(&old, osha1) || !keep_entry(&new, nsha1)))
 307                goto prune;
 308
 309        if (timestamp < cb->cmd->expire_unreachable) {
 310                if (cb->unreachable_expire_kind == UE_ALWAYS)
 311                        goto prune;
 312                if (unreachable(cb, old, osha1) || unreachable(cb, new, nsha1))
 313                        goto prune;
 314        }
 315
 316        if (cb->cmd->recno && --(cb->cmd->recno) == 0)
 317                goto prune;
 318
 319        if (cb->newlog) {
 320                char sign = (tz < 0) ? '-' : '+';
 321                int zone = (tz < 0) ? (-tz) : tz;
 322                fprintf(cb->newlog, "%s %s %s %lu %c%04d\t%s",
 323                        sha1_to_hex(osha1), sha1_to_hex(nsha1),
 324                        email, timestamp, sign, zone,
 325                        message);
 326                hashcpy(cb->last_kept_sha1, nsha1);
 327        }
 328        if (cb->cmd->verbose)
 329                printf("keep %s", message);
 330        return 0;
 331 prune:
 332        if (!cb->newlog)
 333                printf("would prune %s", message);
 334        else if (cb->cmd->verbose)
 335                printf("prune %s", message);
 336        return 0;
 337}
 338
 339static int push_tip_to_list(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
 340{
 341        struct commit_list **list = cb_data;
 342        struct commit *tip_commit;
 343        if (flags & REF_ISSYMREF)
 344                return 0;
 345        tip_commit = lookup_commit_reference_gently(sha1, 1);
 346        if (!tip_commit)
 347                return 0;
 348        commit_list_insert(tip_commit, list);
 349        return 0;
 350}
 351
 352static int expire_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data)
 353{
 354        struct cmd_reflog_expire_cb *cmd = cb_data;
 355        struct expire_reflog_cb cb;
 356        struct ref_lock *lock;
 357        char *log_file, *newlog_path = NULL;
 358        struct commit *tip_commit;
 359        struct commit_list *tips;
 360        int status = 0;
 361
 362        memset(&cb, 0, sizeof(cb));
 363
 364        /*
 365         * we take the lock for the ref itself to prevent it from
 366         * getting updated.
 367         */
 368        lock = lock_any_ref_for_update(ref, sha1, 0, NULL);
 369        if (!lock)
 370                return error("cannot lock ref '%s'", ref);
 371        log_file = git_pathdup("logs/%s", ref);
 372        if (!reflog_exists(ref))
 373                goto finish;
 374        if (!cmd->dry_run) {
 375                newlog_path = git_pathdup("logs/%s.lock", ref);
 376                cb.newlog = fopen(newlog_path, "w");
 377        }
 378
 379        cb.cmd = cmd;
 380
 381        if (!cmd->expire_unreachable || !strcmp(ref, "HEAD")) {
 382                tip_commit = NULL;
 383                cb.unreachable_expire_kind = UE_HEAD;
 384        } else {
 385                tip_commit = lookup_commit_reference_gently(sha1, 1);
 386                if (!tip_commit)
 387                        cb.unreachable_expire_kind = UE_ALWAYS;
 388                else
 389                        cb.unreachable_expire_kind = UE_NORMAL;
 390        }
 391
 392        if (cmd->expire_unreachable <= cmd->expire_total)
 393                cb.unreachable_expire_kind = UE_ALWAYS;
 394
 395        cb.mark_list = NULL;
 396        tips = NULL;
 397        if (cb.unreachable_expire_kind != UE_ALWAYS) {
 398                if (cb.unreachable_expire_kind == UE_HEAD) {
 399                        struct commit_list *elem;
 400                        for_each_ref(push_tip_to_list, &tips);
 401                        for (elem = tips; elem; elem = elem->next)
 402                                commit_list_insert(elem->item, &cb.mark_list);
 403                } else {
 404                        commit_list_insert(tip_commit, &cb.mark_list);
 405                }
 406                cb.mark_limit = cmd->expire_total;
 407                mark_reachable(&cb);
 408        }
 409
 410        for_each_reflog_ent(ref, expire_reflog_ent, &cb);
 411
 412        if (cb.unreachable_expire_kind != UE_ALWAYS) {
 413                if (cb.unreachable_expire_kind == UE_HEAD) {
 414                        struct commit_list *elem;
 415                        for (elem = tips; elem; elem = elem->next)
 416                                clear_commit_marks(elem->item, REACHABLE);
 417                        free_commit_list(tips);
 418                } else {
 419                        clear_commit_marks(tip_commit, REACHABLE);
 420                }
 421        }
 422 finish:
 423        if (cb.newlog) {
 424                if (fclose(cb.newlog)) {
 425                        status |= error("%s: %s", strerror(errno),
 426                                        newlog_path);
 427                        unlink(newlog_path);
 428                } else if (cmd->updateref &&
 429                        (write_in_full(lock->lock_fd,
 430                                sha1_to_hex(cb.last_kept_sha1), 40) != 40 ||
 431                         write_str_in_full(lock->lock_fd, "\n") != 1 ||
 432                         close_ref(lock) < 0)) {
 433                        status |= error("Couldn't write %s",
 434                                        lock->lk->filename.buf);
 435                        unlink(newlog_path);
 436                } else if (rename(newlog_path, log_file)) {
 437                        status |= error("cannot rename %s to %s",
 438                                        newlog_path, log_file);
 439                        unlink(newlog_path);
 440                } else if (cmd->updateref && commit_ref(lock)) {
 441                        status |= error("Couldn't set %s", lock->ref_name);
 442                } else {
 443                        adjust_shared_perm(log_file);
 444                }
 445        }
 446        free(newlog_path);
 447        free(log_file);
 448        unlock_ref(lock);
 449        return status;
 450}
 451
 452static int collect_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data)
 453{
 454        struct collected_reflog *e;
 455        struct collect_reflog_cb *cb = cb_data;
 456        size_t namelen = strlen(ref);
 457
 458        e = xmalloc(sizeof(*e) + namelen + 1);
 459        hashcpy(e->sha1, sha1);
 460        memcpy(e->reflog, ref, namelen + 1);
 461        ALLOC_GROW(cb->e, cb->nr + 1, cb->alloc);
 462        cb->e[cb->nr++] = e;
 463        return 0;
 464}
 465
 466static struct reflog_expire_cfg {
 467        struct reflog_expire_cfg *next;
 468        unsigned long expire_total;
 469        unsigned long expire_unreachable;
 470        size_t len;
 471        char pattern[FLEX_ARRAY];
 472} *reflog_expire_cfg, **reflog_expire_cfg_tail;
 473
 474static struct reflog_expire_cfg *find_cfg_ent(const char *pattern, size_t len)
 475{
 476        struct reflog_expire_cfg *ent;
 477
 478        if (!reflog_expire_cfg_tail)
 479                reflog_expire_cfg_tail = &reflog_expire_cfg;
 480
 481        for (ent = reflog_expire_cfg; ent; ent = ent->next)
 482                if (ent->len == len &&
 483                    !memcmp(ent->pattern, pattern, len))
 484                        return ent;
 485
 486        ent = xcalloc(1, (sizeof(*ent) + len));
 487        memcpy(ent->pattern, pattern, len);
 488        ent->len = len;
 489        *reflog_expire_cfg_tail = ent;
 490        reflog_expire_cfg_tail = &(ent->next);
 491        return ent;
 492}
 493
 494static int parse_expire_cfg_value(const char *var, const char *value, unsigned long *expire)
 495{
 496        if (!value)
 497                return config_error_nonbool(var);
 498        if (parse_expiry_date(value, expire))
 499                return error(_("%s' for '%s' is not a valid timestamp"),
 500                             value, var);
 501        return 0;
 502}
 503
 504/* expiry timer slot */
 505#define EXPIRE_TOTAL   01
 506#define EXPIRE_UNREACH 02
 507
 508static int reflog_expire_config(const char *var, const char *value, void *cb)
 509{
 510        const char *pattern, *key;
 511        int pattern_len;
 512        unsigned long expire;
 513        int slot;
 514        struct reflog_expire_cfg *ent;
 515
 516        if (parse_config_key(var, "gc", &pattern, &pattern_len, &key) < 0)
 517                return git_default_config(var, value, cb);
 518
 519        if (!strcmp(key, "reflogexpire")) {
 520                slot = EXPIRE_TOTAL;
 521                if (parse_expire_cfg_value(var, value, &expire))
 522                        return -1;
 523        } else if (!strcmp(key, "reflogexpireunreachable")) {
 524                slot = EXPIRE_UNREACH;
 525                if (parse_expire_cfg_value(var, value, &expire))
 526                        return -1;
 527        } else
 528                return git_default_config(var, value, cb);
 529
 530        if (!pattern) {
 531                switch (slot) {
 532                case EXPIRE_TOTAL:
 533                        default_reflog_expire = expire;
 534                        break;
 535                case EXPIRE_UNREACH:
 536                        default_reflog_expire_unreachable = expire;
 537                        break;
 538                }
 539                return 0;
 540        }
 541
 542        ent = find_cfg_ent(pattern, pattern_len);
 543        if (!ent)
 544                return -1;
 545        switch (slot) {
 546        case EXPIRE_TOTAL:
 547                ent->expire_total = expire;
 548                break;
 549        case EXPIRE_UNREACH:
 550                ent->expire_unreachable = expire;
 551                break;
 552        }
 553        return 0;
 554}
 555
 556static void set_reflog_expiry_param(struct cmd_reflog_expire_cb *cb, int slot, const char *ref)
 557{
 558        struct reflog_expire_cfg *ent;
 559
 560        if (slot == (EXPIRE_TOTAL|EXPIRE_UNREACH))
 561                return; /* both given explicitly -- nothing to tweak */
 562
 563        for (ent = reflog_expire_cfg; ent; ent = ent->next) {
 564                if (!wildmatch(ent->pattern, ref, 0, NULL)) {
 565                        if (!(slot & EXPIRE_TOTAL))
 566                                cb->expire_total = ent->expire_total;
 567                        if (!(slot & EXPIRE_UNREACH))
 568                                cb->expire_unreachable = ent->expire_unreachable;
 569                        return;
 570                }
 571        }
 572
 573        /*
 574         * If unconfigured, make stash never expire
 575         */
 576        if (!strcmp(ref, "refs/stash")) {
 577                if (!(slot & EXPIRE_TOTAL))
 578                        cb->expire_total = 0;
 579                if (!(slot & EXPIRE_UNREACH))
 580                        cb->expire_unreachable = 0;
 581                return;
 582        }
 583
 584        /* Nothing matched -- use the default value */
 585        if (!(slot & EXPIRE_TOTAL))
 586                cb->expire_total = default_reflog_expire;
 587        if (!(slot & EXPIRE_UNREACH))
 588                cb->expire_unreachable = default_reflog_expire_unreachable;
 589}
 590
 591static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
 592{
 593        struct cmd_reflog_expire_cb cb;
 594        unsigned long now = time(NULL);
 595        int i, status, do_all;
 596        int explicit_expiry = 0;
 597
 598        default_reflog_expire_unreachable = now - 30 * 24 * 3600;
 599        default_reflog_expire = now - 90 * 24 * 3600;
 600        git_config(reflog_expire_config, NULL);
 601
 602        save_commit_buffer = 0;
 603        do_all = status = 0;
 604        memset(&cb, 0, sizeof(cb));
 605
 606        cb.expire_total = default_reflog_expire;
 607        cb.expire_unreachable = default_reflog_expire_unreachable;
 608
 609        for (i = 1; i < argc; i++) {
 610                const char *arg = argv[i];
 611                if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
 612                        cb.dry_run = 1;
 613                else if (starts_with(arg, "--expire=")) {
 614                        if (parse_expiry_date(arg + 9, &cb.expire_total))
 615                                die(_("'%s' is not a valid timestamp"), arg);
 616                        explicit_expiry |= EXPIRE_TOTAL;
 617                }
 618                else if (starts_with(arg, "--expire-unreachable=")) {
 619                        if (parse_expiry_date(arg + 21, &cb.expire_unreachable))
 620                                die(_("'%s' is not a valid timestamp"), arg);
 621                        explicit_expiry |= EXPIRE_UNREACH;
 622                }
 623                else if (!strcmp(arg, "--stale-fix"))
 624                        cb.stalefix = 1;
 625                else if (!strcmp(arg, "--rewrite"))
 626                        cb.rewrite = 1;
 627                else if (!strcmp(arg, "--updateref"))
 628                        cb.updateref = 1;
 629                else if (!strcmp(arg, "--all"))
 630                        do_all = 1;
 631                else if (!strcmp(arg, "--verbose"))
 632                        cb.verbose = 1;
 633                else if (!strcmp(arg, "--")) {
 634                        i++;
 635                        break;
 636                }
 637                else if (arg[0] == '-')
 638                        usage(reflog_expire_usage);
 639                else
 640                        break;
 641        }
 642
 643        /*
 644         * We can trust the commits and objects reachable from refs
 645         * even in older repository.  We cannot trust what's reachable
 646         * from reflog if the repository was pruned with older git.
 647         */
 648        if (cb.stalefix) {
 649                init_revisions(&cb.revs, prefix);
 650                if (cb.verbose)
 651                        printf("Marking reachable objects...");
 652                mark_reachable_objects(&cb.revs, 0, 0, NULL);
 653                if (cb.verbose)
 654                        putchar('\n');
 655        }
 656
 657        if (do_all) {
 658                struct collect_reflog_cb collected;
 659                int i;
 660
 661                memset(&collected, 0, sizeof(collected));
 662                for_each_reflog(collect_reflog, &collected);
 663                for (i = 0; i < collected.nr; i++) {
 664                        struct collected_reflog *e = collected.e[i];
 665                        set_reflog_expiry_param(&cb, explicit_expiry, e->reflog);
 666                        status |= expire_reflog(e->reflog, e->sha1, 0, &cb);
 667                        free(e);
 668                }
 669                free(collected.e);
 670        }
 671
 672        for (; i < argc; i++) {
 673                char *ref;
 674                unsigned char sha1[20];
 675                if (!dwim_log(argv[i], strlen(argv[i]), sha1, &ref)) {
 676                        status |= error("%s points nowhere!", argv[i]);
 677                        continue;
 678                }
 679                set_reflog_expiry_param(&cb, explicit_expiry, ref);
 680                status |= expire_reflog(ref, sha1, 0, &cb);
 681        }
 682        return status;
 683}
 684
 685static int count_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 686                const char *email, unsigned long timestamp, int tz,
 687                const char *message, void *cb_data)
 688{
 689        struct cmd_reflog_expire_cb *cb = cb_data;
 690        if (!cb->expire_total || timestamp < cb->expire_total)
 691                cb->recno++;
 692        return 0;
 693}
 694
 695static int cmd_reflog_delete(int argc, const char **argv, const char *prefix)
 696{
 697        struct cmd_reflog_expire_cb cb;
 698        int i, status = 0;
 699
 700        memset(&cb, 0, sizeof(cb));
 701
 702        for (i = 1; i < argc; i++) {
 703                const char *arg = argv[i];
 704                if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
 705                        cb.dry_run = 1;
 706                else if (!strcmp(arg, "--rewrite"))
 707                        cb.rewrite = 1;
 708                else if (!strcmp(arg, "--updateref"))
 709                        cb.updateref = 1;
 710                else if (!strcmp(arg, "--verbose"))
 711                        cb.verbose = 1;
 712                else if (!strcmp(arg, "--")) {
 713                        i++;
 714                        break;
 715                }
 716                else if (arg[0] == '-')
 717                        usage(reflog_delete_usage);
 718                else
 719                        break;
 720        }
 721
 722        if (argc - i < 1)
 723                return error("Nothing to delete?");
 724
 725        for ( ; i < argc; i++) {
 726                const char *spec = strstr(argv[i], "@{");
 727                unsigned char sha1[20];
 728                char *ep, *ref;
 729                int recno;
 730
 731                if (!spec) {
 732                        status |= error("Not a reflog: %s", argv[i]);
 733                        continue;
 734                }
 735
 736                if (!dwim_log(argv[i], spec - argv[i], sha1, &ref)) {
 737                        status |= error("no reflog for '%s'", argv[i]);
 738                        continue;
 739                }
 740
 741                recno = strtoul(spec + 2, &ep, 10);
 742                if (*ep == '}') {
 743                        cb.recno = -recno;
 744                        for_each_reflog_ent(ref, count_reflog_ent, &cb);
 745                } else {
 746                        cb.expire_total = approxidate(spec + 2);
 747                        for_each_reflog_ent(ref, count_reflog_ent, &cb);
 748                        cb.expire_total = 0;
 749                }
 750
 751                status |= expire_reflog(ref, sha1, 0, &cb);
 752                free(ref);
 753        }
 754        return status;
 755}
 756
 757/*
 758 * main "reflog"
 759 */
 760
 761static const char reflog_usage[] =
 762"git reflog [ show | expire | delete ]";
 763
 764int cmd_reflog(int argc, const char **argv, const char *prefix)
 765{
 766        if (argc > 1 && !strcmp(argv[1], "-h"))
 767                usage(reflog_usage);
 768
 769        /* With no command, we default to showing it. */
 770        if (argc < 2 || *argv[1] == '-')
 771                return cmd_log_reflog(argc, argv, prefix);
 772
 773        if (!strcmp(argv[1], "show"))
 774                return cmd_log_reflog(argc - 1, argv + 1, prefix);
 775
 776        if (!strcmp(argv[1], "expire"))
 777                return cmd_reflog_expire(argc - 1, argv + 1, prefix);
 778
 779        if (!strcmp(argv[1], "delete"))
 780                return cmd_reflog_delete(argc - 1, argv + 1, prefix);
 781
 782        return cmd_log_reflog(argc, argv, prefix);
 783}