builtin/reflog.c

   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
  15 static const char reflog_expire_usage[] =
  16 "git reflog expire [--verbose] [--dry-run] [--stale-fix] [--expire=<time>] [--expire-unreachable=<time>] [--all] <refs>...";
  17 static const char reflog_delete_usage[] =
  18 "git reflog delete [--verbose] [--dry-run] [--rewrite] [--updateref] <refs>...";
  19
  20 static unsigned long default_reflog_expire;
  21 static unsigned long default_reflog_expire_unreachable;
  22
  23 struct 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
  35 struct 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
  45 struct collected_reflog {
  46         unsigned char sha1[20];
  47         char reflog[FLEX_ARRAY];
  48 };
  49 struct 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
  59 static 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
 102 static 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
 191 static 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  */
 221 static 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
 260 static 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
 289 static 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
 335 static 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
 402 static 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
 416 static 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
 424 static 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
 444 static 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
 460 static 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
 507 static 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
 542 static 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
 634 static 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
 644 static 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
 710 static const char reflog_usage[] =
 711 "git reflog [ show | expire | delete ]";
 712
 713 int 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 }