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 /* NEEDSWORK: switch to using parse_options */
  12 static const char reflog_expire_usage[] =
  13 "git reflog expire [--expire=<time>] [--expire-unreachable=<time>] [--rewrite] [--updateref] [--stale-fix] [--dry-run | -n] [--verbose] [--all] <refs>...";
  14 static const char reflog_delete_usage[] =
  15 "git reflog delete [--rewrite] [--updateref] [--dry-run | -n] [--verbose] <refs>...";
  16
  17 static unsigned long default_reflog_expire;
  18 static unsigned long default_reflog_expire_unreachable;
  19
  20 struct cmd_reflog_expire_cb {
  21         struct rev_info revs;
  22         int stalefix;
  23         unsigned long expire_total;
  24         unsigned long expire_unreachable;
  25         int recno;
  26 };
  27
  28 struct expire_reflog_policy_cb {
  29         enum {
  30                 UE_NORMAL,
  31                 UE_ALWAYS,
  32                 UE_HEAD
  33         } unreachable_expire_kind;
  34         struct commit_list *mark_list;
  35         unsigned long mark_limit;
  36         struct cmd_reflog_expire_cb cmd;
  37         struct commit *tip_commit;
  38         struct commit_list *tips;
  39 };
  40
  41 struct collected_reflog {
  42         unsigned char sha1[20];
  43         char reflog[FLEX_ARRAY];
  44 };
  45
  46 struct collect_reflog_cb {
  47         struct collected_reflog **e;
  48         int alloc;
  49         int nr;
  50 };
  51
  52 #define INCOMPLETE      (1u<<10)
  53 #define STUDYING        (1u<<11)
  54 #define REACHABLE       (1u<<12)
  55
  56 static int tree_is_complete(const unsigned char *sha1)
  57 {
  58         struct tree_desc desc;
  59         struct name_entry entry;
  60         int complete;
  61         struct tree *tree;
  62
  63         tree = lookup_tree(sha1);
  64         if (!tree)
  65                 return 0;
  66         if (tree->object.flags & SEEN)
  67                 return 1;
  68         if (tree->object.flags & INCOMPLETE)
  69                 return 0;
  70
  71         if (!tree->buffer) {
  72                 enum object_type type;
  73                 unsigned long size;
  74                 void *data = read_sha1_file(sha1, &type, &size);
  75                 if (!data) {
  76                         tree->object.flags |= INCOMPLETE;
  77                         return 0;
  78                 }
  79                 tree->buffer = data;
  80                 tree->size = size;
  81         }
  82         init_tree_desc(&desc, tree->buffer, tree->size);
  83         complete = 1;
  84         while (tree_entry(&desc, &entry)) {
  85                 if (!has_sha1_file(entry.sha1) ||
  86                     (S_ISDIR(entry.mode) && !tree_is_complete(entry.sha1))) {
  87                         tree->object.flags |= INCOMPLETE;
  88                         complete = 0;
  89                 }
  90         }
  91         free_tree_buffer(tree);
  92
  93         if (complete)
  94                 tree->object.flags |= SEEN;
  95         return complete;
  96 }
  97
  98 static int commit_is_complete(struct commit *commit)
  99 {
 100         struct object_array study;
 101         struct object_array found;
 102         int is_incomplete = 0;
 103         int i;
 104
 105         /* early return */
 106         if (commit->object.flags & SEEN)
 107                 return 1;
 108         if (commit->object.flags & INCOMPLETE)
 109                 return 0;
 110         /*
 111          * Find all commits that are reachable and are not marked as
 112          * SEEN.  Then make sure the trees and blobs contained are
 113          * complete.  After that, mark these commits also as SEEN.
 114          * If some of the objects that are needed to complete this
 115          * commit are missing, mark this commit as INCOMPLETE.
 116          */
 117         memset(&study, 0, sizeof(study));
 118         memset(&found, 0, sizeof(found));
 119         add_object_array(&commit->object, NULL, &study);
 120         add_object_array(&commit->object, NULL, &found);
 121         commit->object.flags |= STUDYING;
 122         while (study.nr) {
 123                 struct commit *c;
 124                 struct commit_list *parent;
 125
 126                 c = (struct commit *)study.objects[--study.nr].item;
 127                 if (!c->object.parsed && !parse_object(c->object.sha1))
 128                         c->object.flags |= INCOMPLETE;
 129
 130                 if (c->object.flags & INCOMPLETE) {
 131                         is_incomplete = 1;
 132                         break;
 133                 }
 134                 else if (c->object.flags & SEEN)
 135                         continue;
 136                 for (parent = c->parents; parent; parent = parent->next) {
 137                         struct commit *p = parent->item;
 138                         if (p->object.flags & STUDYING)
 139                                 continue;
 140                         p->object.flags |= STUDYING;
 141                         add_object_array(&p->object, NULL, &study);
 142                         add_object_array(&p->object, NULL, &found);
 143                 }
 144         }
 145         if (!is_incomplete) {
 146                 /*
 147                  * make sure all commits in "found" array have all the
 148                  * necessary objects.
 149                  */
 150                 for (i = 0; i < found.nr; i++) {
 151                         struct commit *c =
 152                                 (struct commit *)found.objects[i].item;
 153                         if (!tree_is_complete(c->tree->object.sha1)) {
 154                                 is_incomplete = 1;
 155                                 c->object.flags |= INCOMPLETE;
 156                         }
 157                 }
 158                 if (!is_incomplete) {
 159                         /* mark all found commits as complete, iow SEEN */
 160                         for (i = 0; i < found.nr; i++)
 161                                 found.objects[i].item->flags |= SEEN;
 162                 }
 163         }
 164         /* clear flags from the objects we traversed */
 165         for (i = 0; i < found.nr; i++)
 166                 found.objects[i].item->flags &= ~STUDYING;
 167         if (is_incomplete)
 168                 commit->object.flags |= INCOMPLETE;
 169         else {
 170                 /*
 171                  * If we come here, we have (1) traversed the ancestry chain
 172                  * from the "commit" until we reach SEEN commits (which are
 173                  * known to be complete), and (2) made sure that the commits
 174                  * encountered during the above traversal refer to trees that
 175                  * are complete.  Which means that we know *all* the commits
 176                  * we have seen during this process are complete.
 177                  */
 178                 for (i = 0; i < found.nr; i++)
 179                         found.objects[i].item->flags |= SEEN;
 180         }
 181         /* free object arrays */
 182         free(study.objects);
 183         free(found.objects);
 184         return !is_incomplete;
 185 }
 186
 187 static int keep_entry(struct commit **it, unsigned char *sha1)
 188 {
 189         struct commit *commit;
 190
 191         if (is_null_sha1(sha1))
 192                 return 1;
 193         commit = lookup_commit_reference_gently(sha1, 1);
 194         if (!commit)
 195                 return 0;
 196
 197         /*
 198          * Make sure everything in this commit exists.
 199          *
 200          * We have walked all the objects reachable from the refs
 201          * and cache earlier.  The commits reachable by this commit
 202          * must meet SEEN commits -- and then we should mark them as
 203          * SEEN as well.
 204          */
 205         if (!commit_is_complete(commit))
 206                 return 0;
 207         *it = commit;
 208         return 1;
 209 }
 210
 211 /*
 212  * Starting from commits in the cb->mark_list, mark commits that are
 213  * reachable from them.  Stop the traversal at commits older than
 214  * the expire_limit and queue them back, so that the caller can call
 215  * us again to restart the traversal with longer expire_limit.
 216  */
 217 static void mark_reachable(struct expire_reflog_policy_cb *cb)
 218 {
 219         struct commit_list *pending;
 220         unsigned long expire_limit = cb->mark_limit;
 221         struct commit_list *leftover = NULL;
 222
 223         for (pending = cb->mark_list; pending; pending = pending->next)
 224                 pending->item->object.flags &= ~REACHABLE;
 225
 226         pending = cb->mark_list;
 227         while (pending) {
 228                 struct commit_list *parent;
 229                 struct commit *commit = pop_commit(&pending);
 230                 if (commit->object.flags & REACHABLE)
 231                         continue;
 232                 if (parse_commit(commit))
 233                         continue;
 234                 commit->object.flags |= REACHABLE;
 235                 if (commit->date < expire_limit) {
 236                         commit_list_insert(commit, &leftover);
 237                         continue;
 238                 }
 239                 commit->object.flags |= REACHABLE;
 240                 parent = commit->parents;
 241                 while (parent) {
 242                         commit = parent->item;
 243                         parent = parent->next;
 244                         if (commit->object.flags & REACHABLE)
 245                                 continue;
 246                         commit_list_insert(commit, &pending);
 247                 }
 248         }
 249         cb->mark_list = leftover;
 250 }
 251
 252 static int unreachable(struct expire_reflog_policy_cb *cb, struct commit *commit, unsigned char *sha1)
 253 {
 254         /*
 255          * We may or may not have the commit yet - if not, look it
 256          * up using the supplied sha1.
 257          */
 258         if (!commit) {
 259                 if (is_null_sha1(sha1))
 260                         return 0;
 261
 262                 commit = lookup_commit_reference_gently(sha1, 1);
 263
 264                 /* Not a commit -- keep it */
 265                 if (!commit)
 266                         return 0;
 267         }
 268
 269         /* Reachable from the current ref?  Don't prune. */
 270         if (commit->object.flags & REACHABLE)
 271                 return 0;
 272
 273         if (cb->mark_list && cb->mark_limit) {
 274                 cb->mark_limit = 0; /* dig down to the root */
 275                 mark_reachable(cb);
 276         }
 277
 278         return !(commit->object.flags & REACHABLE);
 279 }
 280
 281 /*
 282  * Return true iff the specified reflog entry should be expired.
 283  */
 284 static int should_expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 285                                     const char *email, unsigned long timestamp, int tz,
 286                                     const char *message, void *cb_data)
 287 {
 288         struct expire_reflog_policy_cb *cb = cb_data;
 289         struct commit *old, *new;
 290
 291         if (timestamp < cb->cmd.expire_total)
 292                 return 1;
 293
 294         old = new = NULL;
 295         if (cb->cmd.stalefix &&
 296             (!keep_entry(&old, osha1) || !keep_entry(&new, nsha1)))
 297                 return 1;
 298
 299         if (timestamp < cb->cmd.expire_unreachable) {
 300                 if (cb->unreachable_expire_kind == UE_ALWAYS)
 301                         return 1;
 302                 if (unreachable(cb, old, osha1) || unreachable(cb, new, nsha1))
 303                         return 1;
 304         }
 305
 306         if (cb->cmd.recno && --(cb->cmd.recno) == 0)
 307                 return 1;
 308
 309         return 0;
 310 }
 311
 312 static int push_tip_to_list(const char *refname, const struct object_id *oid,
 313                             int flags, void *cb_data)
 314 {
 315         struct commit_list **list = cb_data;
 316         struct commit *tip_commit;
 317         if (flags & REF_ISSYMREF)
 318                 return 0;
 319         tip_commit = lookup_commit_reference_gently(oid->hash, 1);
 320         if (!tip_commit)
 321                 return 0;
 322         commit_list_insert(tip_commit, list);
 323         return 0;
 324 }
 325
 326 static void reflog_expiry_prepare(const char *refname,
 327                                   const unsigned char *sha1,
 328                                   void *cb_data)
 329 {
 330         struct expire_reflog_policy_cb *cb = cb_data;
 331
 332         if (!cb->cmd.expire_unreachable || !strcmp(refname, "HEAD")) {
 333                 cb->tip_commit = NULL;
 334                 cb->unreachable_expire_kind = UE_HEAD;
 335         } else {
 336                 cb->tip_commit = lookup_commit_reference_gently(sha1, 1);
 337                 if (!cb->tip_commit)
 338                         cb->unreachable_expire_kind = UE_ALWAYS;
 339                 else
 340                         cb->unreachable_expire_kind = UE_NORMAL;
 341         }
 342
 343         if (cb->cmd.expire_unreachable <= cb->cmd.expire_total)
 344                 cb->unreachable_expire_kind = UE_ALWAYS;
 345
 346         cb->mark_list = NULL;
 347         cb->tips = NULL;
 348         if (cb->unreachable_expire_kind != UE_ALWAYS) {
 349                 if (cb->unreachable_expire_kind == UE_HEAD) {
 350                         struct commit_list *elem;
 351
 352                         for_each_ref(push_tip_to_list, &cb->tips);
 353                         for (elem = cb->tips; elem; elem = elem->next)
 354                                 commit_list_insert(elem->item, &cb->mark_list);
 355                 } else {
 356                         commit_list_insert(cb->tip_commit, &cb->mark_list);
 357                 }
 358                 cb->mark_limit = cb->cmd.expire_total;
 359                 mark_reachable(cb);
 360         }
 361 }
 362
 363 static void reflog_expiry_cleanup(void *cb_data)
 364 {
 365         struct expire_reflog_policy_cb *cb = cb_data;
 366
 367         if (cb->unreachable_expire_kind != UE_ALWAYS) {
 368                 if (cb->unreachable_expire_kind == UE_HEAD) {
 369                         struct commit_list *elem;
 370                         for (elem = cb->tips; elem; elem = elem->next)
 371                                 clear_commit_marks(elem->item, REACHABLE);
 372                         free_commit_list(cb->tips);
 373                 } else {
 374                         clear_commit_marks(cb->tip_commit, REACHABLE);
 375                 }
 376         }
 377 }
 378
 379 static int collect_reflog(const char *ref, const struct object_id *oid, int unused, void *cb_data)
 380 {
 381         struct collected_reflog *e;
 382         struct collect_reflog_cb *cb = cb_data;
 383         size_t namelen = strlen(ref);
 384
 385         e = xmalloc(sizeof(*e) + namelen + 1);
 386         hashcpy(e->sha1, oid->hash);
 387         memcpy(e->reflog, ref, namelen + 1);
 388         ALLOC_GROW(cb->e, cb->nr + 1, cb->alloc);
 389         cb->e[cb->nr++] = e;
 390         return 0;
 391 }
 392
 393 static struct reflog_expire_cfg {
 394         struct reflog_expire_cfg *next;
 395         unsigned long expire_total;
 396         unsigned long expire_unreachable;
 397         size_t len;
 398         char pattern[FLEX_ARRAY];
 399 } *reflog_expire_cfg, **reflog_expire_cfg_tail;
 400
 401 static struct reflog_expire_cfg *find_cfg_ent(const char *pattern, size_t len)
 402 {
 403         struct reflog_expire_cfg *ent;
 404
 405         if (!reflog_expire_cfg_tail)
 406                 reflog_expire_cfg_tail = &reflog_expire_cfg;
 407
 408         for (ent = reflog_expire_cfg; ent; ent = ent->next)
 409                 if (ent->len == len &&
 410                     !memcmp(ent->pattern, pattern, len))
 411                         return ent;
 412
 413         ent = xcalloc(1, (sizeof(*ent) + len));
 414         memcpy(ent->pattern, pattern, len);
 415         ent->len = len;
 416         *reflog_expire_cfg_tail = ent;
 417         reflog_expire_cfg_tail = &(ent->next);
 418         return ent;
 419 }
 420
 421 static int parse_expire_cfg_value(const char *var, const char *value, unsigned long *expire)
 422 {
 423         if (!value)
 424                 return config_error_nonbool(var);
 425         if (parse_expiry_date(value, expire))
 426                 return error(_("%s' for '%s' is not a valid timestamp"),
 427                              value, var);
 428         return 0;
 429 }
 430
 431 /* expiry timer slot */
 432 #define EXPIRE_TOTAL   01
 433 #define EXPIRE_UNREACH 02
 434
 435 static int reflog_expire_config(const char *var, const char *value, void *cb)
 436 {
 437         const char *pattern, *key;
 438         int pattern_len;
 439         unsigned long expire;
 440         int slot;
 441         struct reflog_expire_cfg *ent;
 442
 443         if (parse_config_key(var, "gc", &pattern, &pattern_len, &key) < 0)
 444                 return git_default_config(var, value, cb);
 445
 446         if (!strcmp(key, "reflogexpire")) {
 447                 slot = EXPIRE_TOTAL;
 448                 if (parse_expire_cfg_value(var, value, &expire))
 449                         return -1;
 450         } else if (!strcmp(key, "reflogexpireunreachable")) {
 451                 slot = EXPIRE_UNREACH;
 452                 if (parse_expire_cfg_value(var, value, &expire))
 453                         return -1;
 454         } else
 455                 return git_default_config(var, value, cb);
 456
 457         if (!pattern) {
 458                 switch (slot) {
 459                 case EXPIRE_TOTAL:
 460                         default_reflog_expire = expire;
 461                         break;
 462                 case EXPIRE_UNREACH:
 463                         default_reflog_expire_unreachable = expire;
 464                         break;
 465                 }
 466                 return 0;
 467         }
 468
 469         ent = find_cfg_ent(pattern, pattern_len);
 470         if (!ent)
 471                 return -1;
 472         switch (slot) {
 473         case EXPIRE_TOTAL:
 474                 ent->expire_total = expire;
 475                 break;
 476         case EXPIRE_UNREACH:
 477                 ent->expire_unreachable = expire;
 478                 break;
 479         }
 480         return 0;
 481 }
 482
 483 static void set_reflog_expiry_param(struct cmd_reflog_expire_cb *cb, int slot, const char *ref)
 484 {
 485         struct reflog_expire_cfg *ent;
 486
 487         if (slot == (EXPIRE_TOTAL|EXPIRE_UNREACH))
 488                 return; /* both given explicitly -- nothing to tweak */
 489
 490         for (ent = reflog_expire_cfg; ent; ent = ent->next) {
 491                 if (!wildmatch(ent->pattern, ref, 0, NULL)) {
 492                         if (!(slot & EXPIRE_TOTAL))
 493                                 cb->expire_total = ent->expire_total;
 494                         if (!(slot & EXPIRE_UNREACH))
 495                                 cb->expire_unreachable = ent->expire_unreachable;
 496                         return;
 497                 }
 498         }
 499
 500         /*
 501          * If unconfigured, make stash never expire
 502          */
 503         if (!strcmp(ref, "refs/stash")) {
 504                 if (!(slot & EXPIRE_TOTAL))
 505                         cb->expire_total = 0;
 506                 if (!(slot & EXPIRE_UNREACH))
 507                         cb->expire_unreachable = 0;
 508                 return;
 509         }
 510
 511         /* Nothing matched -- use the default value */
 512         if (!(slot & EXPIRE_TOTAL))
 513                 cb->expire_total = default_reflog_expire;
 514         if (!(slot & EXPIRE_UNREACH))
 515                 cb->expire_unreachable = default_reflog_expire_unreachable;
 516 }
 517
 518 static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
 519 {
 520         struct expire_reflog_policy_cb cb;
 521         unsigned long now = time(NULL);
 522         int i, status, do_all;
 523         int explicit_expiry = 0;
 524         unsigned int flags = 0;
 525
 526         default_reflog_expire_unreachable = now - 30 * 24 * 3600;
 527         default_reflog_expire = now - 90 * 24 * 3600;
 528         git_config(reflog_expire_config, NULL);
 529
 530         save_commit_buffer = 0;
 531         do_all = status = 0;
 532         memset(&cb, 0, sizeof(cb));
 533
 534         cb.cmd.expire_total = default_reflog_expire;
 535         cb.cmd.expire_unreachable = default_reflog_expire_unreachable;
 536
 537         for (i = 1; i < argc; i++) {
 538                 const char *arg = argv[i];
 539                 if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
 540                         flags |= EXPIRE_REFLOGS_DRY_RUN;
 541                 else if (starts_with(arg, "--expire=")) {
 542                         if (parse_expiry_date(arg + 9, &cb.cmd.expire_total))
 543                                 die(_("'%s' is not a valid timestamp"), arg);
 544                         explicit_expiry |= EXPIRE_TOTAL;
 545                 }
 546                 else if (starts_with(arg, "--expire-unreachable=")) {
 547                         if (parse_expiry_date(arg + 21, &cb.cmd.expire_unreachable))
 548                                 die(_("'%s' is not a valid timestamp"), arg);
 549                         explicit_expiry |= EXPIRE_UNREACH;
 550                 }
 551                 else if (!strcmp(arg, "--stale-fix"))
 552                         cb.cmd.stalefix = 1;
 553                 else if (!strcmp(arg, "--rewrite"))
 554                         flags |= EXPIRE_REFLOGS_REWRITE;
 555                 else if (!strcmp(arg, "--updateref"))
 556                         flags |= EXPIRE_REFLOGS_UPDATE_REF;
 557                 else if (!strcmp(arg, "--all"))
 558                         do_all = 1;
 559                 else if (!strcmp(arg, "--verbose"))
 560                         flags |= EXPIRE_REFLOGS_VERBOSE;
 561                 else if (!strcmp(arg, "--")) {
 562                         i++;
 563                         break;
 564                 }
 565                 else if (arg[0] == '-')
 566                         usage(reflog_expire_usage);
 567                 else
 568                         break;
 569         }
 570
 571         /*
 572          * We can trust the commits and objects reachable from refs
 573          * even in older repository.  We cannot trust what's reachable
 574          * from reflog if the repository was pruned with older git.
 575          */
 576         if (cb.cmd.stalefix) {
 577                 init_revisions(&cb.cmd.revs, prefix);
 578                 if (flags & EXPIRE_REFLOGS_VERBOSE)
 579                         printf("Marking reachable objects...");
 580                 mark_reachable_objects(&cb.cmd.revs, 0, 0, NULL);
 581                 if (flags & EXPIRE_REFLOGS_VERBOSE)
 582                         putchar('\n');
 583         }
 584
 585         if (do_all) {
 586                 struct collect_reflog_cb collected;
 587                 int i;
 588
 589                 memset(&collected, 0, sizeof(collected));
 590                 for_each_reflog(collect_reflog, &collected);
 591                 for (i = 0; i < collected.nr; i++) {
 592                         struct collected_reflog *e = collected.e[i];
 593                         set_reflog_expiry_param(&cb.cmd, explicit_expiry, e->reflog);
 594                         status |= reflog_expire(e->reflog, e->sha1, flags,
 595                                                 reflog_expiry_prepare,
 596                                                 should_expire_reflog_ent,
 597                                                 reflog_expiry_cleanup,
 598                                                 &cb);
 599                         free(e);
 600                 }
 601                 free(collected.e);
 602         }
 603
 604         for (; i < argc; i++) {
 605                 char *ref;
 606                 unsigned char sha1[20];
 607                 if (!dwim_log(argv[i], strlen(argv[i]), sha1, &ref)) {
 608                         status |= error("%s points nowhere!", argv[i]);
 609                         continue;
 610                 }
 611                 set_reflog_expiry_param(&cb.cmd, explicit_expiry, ref);
 612                 status |= reflog_expire(ref, sha1, flags,
 613                                         reflog_expiry_prepare,
 614                                         should_expire_reflog_ent,
 615                                         reflog_expiry_cleanup,
 616                                         &cb);
 617         }
 618         return status;
 619 }
 620
 621 static int count_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 622                 const char *email, unsigned long timestamp, int tz,
 623                 const char *message, void *cb_data)
 624 {
 625         struct expire_reflog_policy_cb *cb = cb_data;
 626         if (!cb->cmd.expire_total || timestamp < cb->cmd.expire_total)
 627                 cb->cmd.recno++;
 628         return 0;
 629 }
 630
 631 static int cmd_reflog_delete(int argc, const char **argv, const char *prefix)
 632 {
 633         struct expire_reflog_policy_cb cb;
 634         int i, status = 0;
 635         unsigned int flags = 0;
 636
 637         memset(&cb, 0, sizeof(cb));
 638
 639         for (i = 1; i < argc; i++) {
 640                 const char *arg = argv[i];
 641                 if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
 642                         flags |= EXPIRE_REFLOGS_DRY_RUN;
 643                 else if (!strcmp(arg, "--rewrite"))
 644                         flags |= EXPIRE_REFLOGS_REWRITE;
 645                 else if (!strcmp(arg, "--updateref"))
 646                         flags |= EXPIRE_REFLOGS_UPDATE_REF;
 647                 else if (!strcmp(arg, "--verbose"))
 648                         flags |= EXPIRE_REFLOGS_VERBOSE;
 649                 else if (!strcmp(arg, "--")) {
 650                         i++;
 651                         break;
 652                 }
 653                 else if (arg[0] == '-')
 654                         usage(reflog_delete_usage);
 655                 else
 656                         break;
 657         }
 658
 659         if (argc - i < 1)
 660                 return error("Nothing to delete?");
 661
 662         for ( ; i < argc; i++) {
 663                 const char *spec = strstr(argv[i], "@{");
 664                 unsigned char sha1[20];
 665                 char *ep, *ref;
 666                 int recno;
 667
 668                 if (!spec) {
 669                         status |= error("Not a reflog: %s", argv[i]);
 670                         continue;
 671                 }
 672
 673                 if (!dwim_log(argv[i], spec - argv[i], sha1, &ref)) {
 674                         status |= error("no reflog for '%s'", argv[i]);
 675                         continue;
 676                 }
 677
 678                 recno = strtoul(spec + 2, &ep, 10);
 679                 if (*ep == '}') {
 680                         cb.cmd.recno = -recno;
 681                         for_each_reflog_ent(ref, count_reflog_ent, &cb);
 682                 } else {
 683                         cb.cmd.expire_total = approxidate(spec + 2);
 684                         for_each_reflog_ent(ref, count_reflog_ent, &cb);
 685                         cb.cmd.expire_total = 0;
 686                 }
 687
 688                 status |= reflog_expire(ref, sha1, flags,
 689                                         reflog_expiry_prepare,
 690                                         should_expire_reflog_ent,
 691                                         reflog_expiry_cleanup,
 692                                         &cb);
 693                 free(ref);
 694         }
 695         return status;
 696 }
 697
 698 /*
 699  * main "reflog"
 700  */
 701
 702 static const char reflog_usage[] =
 703 "git reflog [ show | expire | delete ]";
 704
 705 int cmd_reflog(int argc, const char **argv, const char *prefix)
 706 {
 707         if (argc > 1 && !strcmp(argv[1], "-h"))
 708                 usage(reflog_usage);
 709
 710         /* With no command, we default to showing it. */
 711         if (argc < 2 || *argv[1] == '-')
 712                 return cmd_log_reflog(argc, argv, prefix);
 713
 714         if (!strcmp(argv[1], "show"))
 715                 return cmd_log_reflog(argc - 1, argv + 1, prefix);
 716
 717         if (!strcmp(argv[1], "expire"))
 718                 return cmd_reflog_expire(argc - 1, argv + 1, prefix);
 719
 720         if (!strcmp(argv[1], "delete"))
 721                 return cmd_reflog_delete(argc - 1, argv + 1, prefix);
 722
 723         return cmd_log_reflog(argc, argv, prefix);
 724 }