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

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