doc: prefer 'stash push' over 'stash save'
[git/git.git] / builtin / reflog.c
1 #include "builtin.h"
2 #include "config.h"
3 #include "lockfile.h"
4 #include "commit.h"
5 #include "refs.h"
6 #include "dir.h"
7 #include "tree-walk.h"
8 #include "diff.h"
9 #include "revision.h"
10 #include "reachable.h"
11
12 /* NEEDSWORK: switch to using parse_options */
13 static const char reflog_expire_usage[] =
14 "git reflog expire [--expire=<time>] [--expire-unreachable=<time>] [--rewrite] [--updateref] [--stale-fix] [--dry-run | -n] [--verbose] [--all] <refs>...";
15 static const char reflog_delete_usage[] =
16 "git reflog delete [--rewrite] [--updateref] [--dry-run | -n] [--verbose] <refs>...";
17 static const char reflog_exists_usage[] =
18 "git reflog exists <ref>";
19
20 static timestamp_t default_reflog_expire;
21 static timestamp_t default_reflog_expire_unreachable;
22
23 struct cmd_reflog_expire_cb {
24 struct rev_info revs;
25 int stalefix;
26 timestamp_t expire_total;
27 timestamp_t 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 struct object_id *oid)
60 {
61 struct tree_desc desc;
62 struct name_entry entry;
63 int complete;
64 struct tree *tree;
65
66 tree = lookup_tree(oid);
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(oid->hash, &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.oid->hash) ||
89 (S_ISDIR(entry.mode) && !tree_is_complete(entry.oid))) {
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 *)object_array_pop(&study);
130 if (!c->object.parsed && !parse_object(&c->object.oid))
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.oid)) {
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 object_array_clear(&study);
186 object_array_clear(&found);
187 return !is_incomplete;
188 }
189
190 static int keep_entry(struct commit **it, struct object_id *oid)
191 {
192 struct commit *commit;
193
194 if (is_null_oid(oid))
195 return 1;
196 commit = lookup_commit_reference_gently(oid, 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_list *pending;
223 timestamp_t expire_limit = cb->mark_limit;
224 struct commit_list *leftover = NULL;
225
226 for (pending = cb->mark_list; pending; pending = pending->next)
227 pending->item->object.flags &= ~REACHABLE;
228
229 pending = cb->mark_list;
230 while (pending) {
231 struct commit_list *parent;
232 struct commit *commit = pop_commit(&pending);
233 if (commit->object.flags & REACHABLE)
234 continue;
235 if (parse_commit(commit))
236 continue;
237 commit->object.flags |= REACHABLE;
238 if (commit->date < expire_limit) {
239 commit_list_insert(commit, &leftover);
240 continue;
241 }
242 commit->object.flags |= REACHABLE;
243 parent = commit->parents;
244 while (parent) {
245 commit = parent->item;
246 parent = parent->next;
247 if (commit->object.flags & REACHABLE)
248 continue;
249 commit_list_insert(commit, &pending);
250 }
251 }
252 cb->mark_list = leftover;
253 }
254
255 static int unreachable(struct expire_reflog_policy_cb *cb, struct commit *commit, struct object_id *oid)
256 {
257 /*
258 * We may or may not have the commit yet - if not, look it
259 * up using the supplied sha1.
260 */
261 if (!commit) {
262 if (is_null_oid(oid))
263 return 0;
264
265 commit = lookup_commit_reference_gently(oid, 1);
266
267 /* Not a commit -- keep it */
268 if (!commit)
269 return 0;
270 }
271
272 /* Reachable from the current ref? Don't prune. */
273 if (commit->object.flags & REACHABLE)
274 return 0;
275
276 if (cb->mark_list && cb->mark_limit) {
277 cb->mark_limit = 0; /* dig down to the root */
278 mark_reachable(cb);
279 }
280
281 return !(commit->object.flags & REACHABLE);
282 }
283
284 /*
285 * Return true iff the specified reflog entry should be expired.
286 */
287 static int should_expire_reflog_ent(struct object_id *ooid, struct object_id *noid,
288 const char *email, timestamp_t timestamp, int tz,
289 const char *message, void *cb_data)
290 {
291 struct expire_reflog_policy_cb *cb = cb_data;
292 struct commit *old, *new;
293
294 if (timestamp < cb->cmd.expire_total)
295 return 1;
296
297 old = new = NULL;
298 if (cb->cmd.stalefix &&
299 (!keep_entry(&old, ooid) || !keep_entry(&new, noid)))
300 return 1;
301
302 if (timestamp < cb->cmd.expire_unreachable) {
303 if (cb->unreachable_expire_kind == UE_ALWAYS)
304 return 1;
305 if (unreachable(cb, old, ooid) || unreachable(cb, new, noid))
306 return 1;
307 }
308
309 if (cb->cmd.recno && --(cb->cmd.recno) == 0)
310 return 1;
311
312 return 0;
313 }
314
315 static int push_tip_to_list(const char *refname, const struct object_id *oid,
316 int flags, void *cb_data)
317 {
318 struct commit_list **list = cb_data;
319 struct commit *tip_commit;
320 if (flags & REF_ISSYMREF)
321 return 0;
322 tip_commit = lookup_commit_reference_gently(oid, 1);
323 if (!tip_commit)
324 return 0;
325 commit_list_insert(tip_commit, list);
326 return 0;
327 }
328
329 static void reflog_expiry_prepare(const char *refname,
330 const struct object_id *oid,
331 void *cb_data)
332 {
333 struct expire_reflog_policy_cb *cb = cb_data;
334
335 if (!cb->cmd.expire_unreachable || !strcmp(refname, "HEAD")) {
336 cb->tip_commit = NULL;
337 cb->unreachable_expire_kind = UE_HEAD;
338 } else {
339 cb->tip_commit = lookup_commit_reference_gently(oid, 1);
340 if (!cb->tip_commit)
341 cb->unreachable_expire_kind = UE_ALWAYS;
342 else
343 cb->unreachable_expire_kind = UE_NORMAL;
344 }
345
346 if (cb->cmd.expire_unreachable <= cb->cmd.expire_total)
347 cb->unreachable_expire_kind = UE_ALWAYS;
348
349 cb->mark_list = NULL;
350 cb->tips = NULL;
351 if (cb->unreachable_expire_kind != UE_ALWAYS) {
352 if (cb->unreachable_expire_kind == UE_HEAD) {
353 struct commit_list *elem;
354
355 for_each_ref(push_tip_to_list, &cb->tips);
356 for (elem = cb->tips; elem; elem = elem->next)
357 commit_list_insert(elem->item, &cb->mark_list);
358 } else {
359 commit_list_insert(cb->tip_commit, &cb->mark_list);
360 }
361 cb->mark_limit = cb->cmd.expire_total;
362 mark_reachable(cb);
363 }
364 }
365
366 static void reflog_expiry_cleanup(void *cb_data)
367 {
368 struct expire_reflog_policy_cb *cb = cb_data;
369
370 if (cb->unreachable_expire_kind != UE_ALWAYS) {
371 if (cb->unreachable_expire_kind == UE_HEAD) {
372 struct commit_list *elem;
373 for (elem = cb->tips; elem; elem = elem->next)
374 clear_commit_marks(elem->item, REACHABLE);
375 free_commit_list(cb->tips);
376 } else {
377 clear_commit_marks(cb->tip_commit, REACHABLE);
378 }
379 }
380 }
381
382 static int collect_reflog(const char *ref, const struct object_id *oid, int unused, void *cb_data)
383 {
384 struct collected_reflog *e;
385 struct collect_reflog_cb *cb = cb_data;
386
387 FLEX_ALLOC_STR(e, reflog, ref);
388 hashcpy(e->sha1, oid->hash);
389 ALLOC_GROW(cb->e, cb->nr + 1, cb->alloc);
390 cb->e[cb->nr++] = e;
391 return 0;
392 }
393
394 static struct reflog_expire_cfg {
395 struct reflog_expire_cfg *next;
396 timestamp_t expire_total;
397 timestamp_t expire_unreachable;
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 (!strncmp(ent->pattern, pattern, len) &&
410 ent->pattern[len] == '\0')
411 return ent;
412
413 FLEX_ALLOC_MEM(ent, pattern, pattern, len);
414 *reflog_expire_cfg_tail = ent;
415 reflog_expire_cfg_tail = &(ent->next);
416 return ent;
417 }
418
419 static int parse_expire_cfg_value(const char *var, const char *value, timestamp_t *expire)
420 {
421 if (!value)
422 return config_error_nonbool(var);
423 if (parse_expiry_date(value, expire))
424 return error(_("'%s' for '%s' is not a valid timestamp"),
425 value, var);
426 return 0;
427 }
428
429 /* expiry timer slot */
430 #define EXPIRE_TOTAL 01
431 #define EXPIRE_UNREACH 02
432
433 static int reflog_expire_config(const char *var, const char *value, void *cb)
434 {
435 const char *pattern, *key;
436 int pattern_len;
437 timestamp_t expire;
438 int slot;
439 struct reflog_expire_cfg *ent;
440
441 if (parse_config_key(var, "gc", &pattern, &pattern_len, &key) < 0)
442 return git_default_config(var, value, cb);
443
444 if (!strcmp(key, "reflogexpire")) {
445 slot = EXPIRE_TOTAL;
446 if (parse_expire_cfg_value(var, value, &expire))
447 return -1;
448 } else if (!strcmp(key, "reflogexpireunreachable")) {
449 slot = EXPIRE_UNREACH;
450 if (parse_expire_cfg_value(var, value, &expire))
451 return -1;
452 } else
453 return git_default_config(var, value, cb);
454
455 if (!pattern) {
456 switch (slot) {
457 case EXPIRE_TOTAL:
458 default_reflog_expire = expire;
459 break;
460 case EXPIRE_UNREACH:
461 default_reflog_expire_unreachable = expire;
462 break;
463 }
464 return 0;
465 }
466
467 ent = find_cfg_ent(pattern, pattern_len);
468 if (!ent)
469 return -1;
470 switch (slot) {
471 case EXPIRE_TOTAL:
472 ent->expire_total = expire;
473 break;
474 case EXPIRE_UNREACH:
475 ent->expire_unreachable = expire;
476 break;
477 }
478 return 0;
479 }
480
481 static void set_reflog_expiry_param(struct cmd_reflog_expire_cb *cb, int slot, const char *ref)
482 {
483 struct reflog_expire_cfg *ent;
484
485 if (slot == (EXPIRE_TOTAL|EXPIRE_UNREACH))
486 return; /* both given explicitly -- nothing to tweak */
487
488 for (ent = reflog_expire_cfg; ent; ent = ent->next) {
489 if (!wildmatch(ent->pattern, ref, 0)) {
490 if (!(slot & EXPIRE_TOTAL))
491 cb->expire_total = ent->expire_total;
492 if (!(slot & EXPIRE_UNREACH))
493 cb->expire_unreachable = ent->expire_unreachable;
494 return;
495 }
496 }
497
498 /*
499 * If unconfigured, make stash never expire
500 */
501 if (!strcmp(ref, "refs/stash")) {
502 if (!(slot & EXPIRE_TOTAL))
503 cb->expire_total = 0;
504 if (!(slot & EXPIRE_UNREACH))
505 cb->expire_unreachable = 0;
506 return;
507 }
508
509 /* Nothing matched -- use the default value */
510 if (!(slot & EXPIRE_TOTAL))
511 cb->expire_total = default_reflog_expire;
512 if (!(slot & EXPIRE_UNREACH))
513 cb->expire_unreachable = default_reflog_expire_unreachable;
514 }
515
516 static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
517 {
518 struct expire_reflog_policy_cb cb;
519 timestamp_t now = time(NULL);
520 int i, status, do_all;
521 int explicit_expiry = 0;
522 unsigned int flags = 0;
523
524 default_reflog_expire_unreachable = now - 30 * 24 * 3600;
525 default_reflog_expire = now - 90 * 24 * 3600;
526 git_config(reflog_expire_config, NULL);
527
528 save_commit_buffer = 0;
529 do_all = status = 0;
530 memset(&cb, 0, sizeof(cb));
531
532 cb.cmd.expire_total = default_reflog_expire;
533 cb.cmd.expire_unreachable = default_reflog_expire_unreachable;
534
535 for (i = 1; i < argc; i++) {
536 const char *arg = argv[i];
537 if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
538 flags |= EXPIRE_REFLOGS_DRY_RUN;
539 else if (starts_with(arg, "--expire=")) {
540 if (parse_expiry_date(arg + 9, &cb.cmd.expire_total))
541 die(_("'%s' is not a valid timestamp"), arg);
542 explicit_expiry |= EXPIRE_TOTAL;
543 }
544 else if (starts_with(arg, "--expire-unreachable=")) {
545 if (parse_expiry_date(arg + 21, &cb.cmd.expire_unreachable))
546 die(_("'%s' is not a valid timestamp"), arg);
547 explicit_expiry |= EXPIRE_UNREACH;
548 }
549 else if (!strcmp(arg, "--stale-fix"))
550 cb.cmd.stalefix = 1;
551 else if (!strcmp(arg, "--rewrite"))
552 flags |= EXPIRE_REFLOGS_REWRITE;
553 else if (!strcmp(arg, "--updateref"))
554 flags |= EXPIRE_REFLOGS_UPDATE_REF;
555 else if (!strcmp(arg, "--all"))
556 do_all = 1;
557 else if (!strcmp(arg, "--verbose"))
558 flags |= EXPIRE_REFLOGS_VERBOSE;
559 else if (!strcmp(arg, "--")) {
560 i++;
561 break;
562 }
563 else if (arg[0] == '-')
564 usage(reflog_expire_usage);
565 else
566 break;
567 }
568
569 /*
570 * We can trust the commits and objects reachable from refs
571 * even in older repository. We cannot trust what's reachable
572 * from reflog if the repository was pruned with older git.
573 */
574 if (cb.cmd.stalefix) {
575 init_revisions(&cb.cmd.revs, prefix);
576 if (flags & EXPIRE_REFLOGS_VERBOSE)
577 printf("Marking reachable objects...");
578 mark_reachable_objects(&cb.cmd.revs, 0, 0, NULL);
579 if (flags & EXPIRE_REFLOGS_VERBOSE)
580 putchar('\n');
581 }
582
583 if (do_all) {
584 struct collect_reflog_cb collected;
585 int i;
586
587 memset(&collected, 0, sizeof(collected));
588 for_each_reflog(collect_reflog, &collected);
589 for (i = 0; i < collected.nr; i++) {
590 struct collected_reflog *e = collected.e[i];
591 set_reflog_expiry_param(&cb.cmd, explicit_expiry, e->reflog);
592 status |= reflog_expire(e->reflog, e->sha1, flags,
593 reflog_expiry_prepare,
594 should_expire_reflog_ent,
595 reflog_expiry_cleanup,
596 &cb);
597 free(e);
598 }
599 free(collected.e);
600 }
601
602 for (; i < argc; i++) {
603 char *ref;
604 unsigned char sha1[20];
605 if (!dwim_log(argv[i], strlen(argv[i]), sha1, &ref)) {
606 status |= error("%s points nowhere!", argv[i]);
607 continue;
608 }
609 set_reflog_expiry_param(&cb.cmd, explicit_expiry, ref);
610 status |= reflog_expire(ref, sha1, flags,
611 reflog_expiry_prepare,
612 should_expire_reflog_ent,
613 reflog_expiry_cleanup,
614 &cb);
615 }
616 return status;
617 }
618
619 static int count_reflog_ent(struct object_id *ooid, struct object_id *noid,
620 const char *email, timestamp_t timestamp, int tz,
621 const char *message, void *cb_data)
622 {
623 struct expire_reflog_policy_cb *cb = cb_data;
624 if (!cb->cmd.expire_total || timestamp < cb->cmd.expire_total)
625 cb->cmd.recno++;
626 return 0;
627 }
628
629 static int cmd_reflog_delete(int argc, const char **argv, const char *prefix)
630 {
631 struct expire_reflog_policy_cb cb;
632 int i, status = 0;
633 unsigned int flags = 0;
634
635 memset(&cb, 0, sizeof(cb));
636
637 for (i = 1; i < argc; i++) {
638 const char *arg = argv[i];
639 if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
640 flags |= EXPIRE_REFLOGS_DRY_RUN;
641 else if (!strcmp(arg, "--rewrite"))
642 flags |= EXPIRE_REFLOGS_REWRITE;
643 else if (!strcmp(arg, "--updateref"))
644 flags |= EXPIRE_REFLOGS_UPDATE_REF;
645 else if (!strcmp(arg, "--verbose"))
646 flags |= EXPIRE_REFLOGS_VERBOSE;
647 else if (!strcmp(arg, "--")) {
648 i++;
649 break;
650 }
651 else if (arg[0] == '-')
652 usage(reflog_delete_usage);
653 else
654 break;
655 }
656
657 if (argc - i < 1)
658 return error("Nothing to delete?");
659
660 for ( ; i < argc; i++) {
661 const char *spec = strstr(argv[i], "@{");
662 unsigned char sha1[20];
663 char *ep, *ref;
664 int recno;
665
666 if (!spec) {
667 status |= error("Not a reflog: %s", argv[i]);
668 continue;
669 }
670
671 if (!dwim_log(argv[i], spec - argv[i], sha1, &ref)) {
672 status |= error("no reflog for '%s'", argv[i]);
673 continue;
674 }
675
676 recno = strtoul(spec + 2, &ep, 10);
677 if (*ep == '}') {
678 cb.cmd.recno = -recno;
679 for_each_reflog_ent(ref, count_reflog_ent, &cb);
680 } else {
681 cb.cmd.expire_total = approxidate(spec + 2);
682 for_each_reflog_ent(ref, count_reflog_ent, &cb);
683 cb.cmd.expire_total = 0;
684 }
685
686 status |= reflog_expire(ref, sha1, flags,
687 reflog_expiry_prepare,
688 should_expire_reflog_ent,
689 reflog_expiry_cleanup,
690 &cb);
691 free(ref);
692 }
693 return status;
694 }
695
696 static int cmd_reflog_exists(int argc, const char **argv, const char *prefix)
697 {
698 int i, start = 0;
699
700 for (i = 1; i < argc; i++) {
701 const char *arg = argv[i];
702 if (!strcmp(arg, "--")) {
703 i++;
704 break;
705 }
706 else if (arg[0] == '-')
707 usage(reflog_exists_usage);
708 else
709 break;
710 }
711
712 start = i;
713
714 if (argc - start != 1)
715 usage(reflog_exists_usage);
716
717 if (check_refname_format(argv[start], REFNAME_ALLOW_ONELEVEL))
718 die("invalid ref format: %s", argv[start]);
719 return !reflog_exists(argv[start]);
720 }
721
722 /*
723 * main "reflog"
724 */
725
726 static const char reflog_usage[] =
727 "git reflog [ show | expire | delete | exists ]";
728
729 int cmd_reflog(int argc, const char **argv, const char *prefix)
730 {
731 if (argc > 1 && !strcmp(argv[1], "-h"))
732 usage(reflog_usage);
733
734 /* With no command, we default to showing it. */
735 if (argc < 2 || *argv[1] == '-')
736 return cmd_log_reflog(argc, argv, prefix);
737
738 if (!strcmp(argv[1], "show"))
739 return cmd_log_reflog(argc - 1, argv + 1, prefix);
740
741 if (!strcmp(argv[1], "expire"))
742 return cmd_reflog_expire(argc - 1, argv + 1, prefix);
743
744 if (!strcmp(argv[1], "delete"))
745 return cmd_reflog_delete(argc - 1, argv + 1, prefix);
746
747 if (!strcmp(argv[1], "exists"))
748 return cmd_reflog_exists(argc - 1, argv + 1, prefix);
749
750 return cmd_log_reflog(argc, argv, prefix);
751 }