git.oblomov.eu Git - git/blob - builtin/reflog.c

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