submodule: Use cat instead of echo to avoid DOS line-endings
[git/dscho.git] / builtin / reflog.c
blob062d7dad1b5af720e70adcaa05b60bf68977b05c
1 #include "cache.h"
2 #include "builtin.h"
3 #include "commit.h"
4 #include "refs.h"
5 #include "dir.h"
6 #include "tree-walk.h"
7 #include "diff.h"
8 #include "revision.h"
9 #include "reachable.h"
12 * reflog expire
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>...";
20 static unsigned long default_reflog_expire;
21 static unsigned long default_reflog_expire_unreachable;
23 struct cmd_reflog_expire_cb {
24 struct rev_info revs;
25 int dry_run;
26 int stalefix;
27 int rewrite;
28 int updateref;
29 int verbose;
30 unsigned long expire_total;
31 unsigned long expire_unreachable;
32 int recno;
35 struct expire_reflog_cb {
36 FILE *newlog;
37 enum {
38 UE_NORMAL,
39 UE_ALWAYS,
40 UE_HEAD
41 } unreachable_expire_kind;
42 struct commit_list *mark_list;
43 unsigned long mark_limit;
44 struct cmd_reflog_expire_cb *cmd;
45 unsigned char last_kept_sha1[20];
48 struct collected_reflog {
49 unsigned char sha1[20];
50 char reflog[FLEX_ARRAY];
52 struct collect_reflog_cb {
53 struct collected_reflog **e;
54 int alloc;
55 int nr;
58 #define INCOMPLETE (1u<<10)
59 #define STUDYING (1u<<11)
60 #define REACHABLE (1u<<12)
62 static int tree_is_complete(const unsigned char *sha1)
64 struct tree_desc desc;
65 struct name_entry entry;
66 int complete;
67 struct tree *tree;
69 tree = lookup_tree(sha1);
70 if (!tree)
71 return 0;
72 if (tree->object.flags & SEEN)
73 return 1;
74 if (tree->object.flags & INCOMPLETE)
75 return 0;
77 if (!tree->buffer) {
78 enum object_type type;
79 unsigned long size;
80 void *data = read_sha1_file(sha1, &type, &size);
81 if (!data) {
82 tree->object.flags |= INCOMPLETE;
83 return 0;
85 tree->buffer = data;
86 tree->size = size;
88 init_tree_desc(&desc, tree->buffer, tree->size);
89 complete = 1;
90 while (tree_entry(&desc, &entry)) {
91 if (!has_sha1_file(entry.sha1) ||
92 (S_ISDIR(entry.mode) && !tree_is_complete(entry.sha1))) {
93 tree->object.flags |= INCOMPLETE;
94 complete = 0;
97 free(tree->buffer);
98 tree->buffer = NULL;
100 if (complete)
101 tree->object.flags |= SEEN;
102 return complete;
105 static int commit_is_complete(struct commit *commit)
107 struct object_array study;
108 struct object_array found;
109 int is_incomplete = 0;
110 int i;
112 /* early return */
113 if (commit->object.flags & SEEN)
114 return 1;
115 if (commit->object.flags & INCOMPLETE)
116 return 0;
118 * Find all commits that are reachable and are not marked as
119 * SEEN. Then make sure the trees and blobs contained are
120 * complete. After that, mark these commits also as SEEN.
121 * If some of the objects that are needed to complete this
122 * commit are missing, mark this commit as INCOMPLETE.
124 memset(&study, 0, sizeof(study));
125 memset(&found, 0, sizeof(found));
126 add_object_array(&commit->object, NULL, &study);
127 add_object_array(&commit->object, NULL, &found);
128 commit->object.flags |= STUDYING;
129 while (study.nr) {
130 struct commit *c;
131 struct commit_list *parent;
133 c = (struct commit *)study.objects[--study.nr].item;
134 if (!c->object.parsed && !parse_object(c->object.sha1))
135 c->object.flags |= INCOMPLETE;
137 if (c->object.flags & INCOMPLETE) {
138 is_incomplete = 1;
139 break;
141 else if (c->object.flags & SEEN)
142 continue;
143 for (parent = c->parents; parent; parent = parent->next) {
144 struct commit *p = parent->item;
145 if (p->object.flags & STUDYING)
146 continue;
147 p->object.flags |= STUDYING;
148 add_object_array(&p->object, NULL, &study);
149 add_object_array(&p->object, NULL, &found);
152 if (!is_incomplete) {
154 * make sure all commits in "found" array have all the
155 * necessary objects.
157 for (i = 0; i < found.nr; i++) {
158 struct commit *c =
159 (struct commit *)found.objects[i].item;
160 if (!tree_is_complete(c->tree->object.sha1)) {
161 is_incomplete = 1;
162 c->object.flags |= INCOMPLETE;
165 if (!is_incomplete) {
166 /* mark all found commits as complete, iow SEEN */
167 for (i = 0; i < found.nr; i++)
168 found.objects[i].item->flags |= SEEN;
171 /* clear flags from the objects we traversed */
172 for (i = 0; i < found.nr; i++)
173 found.objects[i].item->flags &= ~STUDYING;
174 if (is_incomplete)
175 commit->object.flags |= INCOMPLETE;
176 else {
178 * If we come here, we have (1) traversed the ancestry chain
179 * from the "commit" until we reach SEEN commits (which are
180 * known to be complete), and (2) made sure that the commits
181 * encountered during the above traversal refer to trees that
182 * are complete. Which means that we know *all* the commits
183 * we have seen during this process are complete.
185 for (i = 0; i < found.nr; i++)
186 found.objects[i].item->flags |= SEEN;
188 /* free object arrays */
189 free(study.objects);
190 free(found.objects);
191 return !is_incomplete;
194 static int keep_entry(struct commit **it, unsigned char *sha1)
196 struct commit *commit;
198 if (is_null_sha1(sha1))
199 return 1;
200 commit = lookup_commit_reference_gently(sha1, 1);
201 if (!commit)
202 return 0;
205 * Make sure everything in this commit exists.
207 * We have walked all the objects reachable from the refs
208 * and cache earlier. The commits reachable by this commit
209 * must meet SEEN commits -- and then we should mark them as
210 * SEEN as well.
212 if (!commit_is_complete(commit))
213 return 0;
214 *it = commit;
215 return 1;
219 * Starting from commits in the cb->mark_list, mark commits that are
220 * reachable from them. Stop the traversal at commits older than
221 * the expire_limit and queue them back, so that the caller can call
222 * us again to restart the traversal with longer expire_limit.
224 static void mark_reachable(struct expire_reflog_cb *cb)
226 struct commit *commit;
227 struct commit_list *pending;
228 unsigned long expire_limit = cb->mark_limit;
229 struct commit_list *leftover = NULL;
231 for (pending = cb->mark_list; pending; pending = pending->next)
232 pending->item->object.flags &= ~REACHABLE;
234 pending = cb->mark_list;
235 while (pending) {
236 struct commit_list *entry = pending;
237 struct commit_list *parent;
238 pending = entry->next;
239 commit = entry->item;
240 free(entry);
241 if (commit->object.flags & REACHABLE)
242 continue;
243 if (parse_commit(commit))
244 continue;
245 commit->object.flags |= REACHABLE;
246 if (commit->date < expire_limit) {
247 commit_list_insert(commit, &leftover);
248 continue;
250 commit->object.flags |= REACHABLE;
251 parent = commit->parents;
252 while (parent) {
253 commit = parent->item;
254 parent = parent->next;
255 if (commit->object.flags & REACHABLE)
256 continue;
257 commit_list_insert(commit, &pending);
260 cb->mark_list = leftover;
263 static int unreachable(struct expire_reflog_cb *cb, struct commit *commit, unsigned char *sha1)
266 * We may or may not have the commit yet - if not, look it
267 * up using the supplied sha1.
269 if (!commit) {
270 if (is_null_sha1(sha1))
271 return 0;
273 commit = lookup_commit_reference_gently(sha1, 1);
275 /* Not a commit -- keep it */
276 if (!commit)
277 return 0;
280 /* Reachable from the current ref? Don't prune. */
281 if (commit->object.flags & REACHABLE)
282 return 0;
284 if (cb->mark_list && cb->mark_limit) {
285 cb->mark_limit = 0; /* dig down to the root */
286 mark_reachable(cb);
289 return !(commit->object.flags & REACHABLE);
292 static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
293 const char *email, unsigned long timestamp, int tz,
294 const char *message, void *cb_data)
296 struct expire_reflog_cb *cb = cb_data;
297 struct commit *old, *new;
299 if (timestamp < cb->cmd->expire_total)
300 goto prune;
302 if (cb->cmd->rewrite)
303 osha1 = cb->last_kept_sha1;
305 old = new = NULL;
306 if (cb->cmd->stalefix &&
307 (!keep_entry(&old, osha1) || !keep_entry(&new, nsha1)))
308 goto prune;
310 if (timestamp < cb->cmd->expire_unreachable) {
311 if (cb->unreachable_expire_kind == UE_ALWAYS)
312 goto prune;
313 if (unreachable(cb, old, osha1) || unreachable(cb, new, nsha1))
314 goto prune;
317 if (cb->cmd->recno && --(cb->cmd->recno) == 0)
318 goto prune;
320 if (cb->newlog) {
321 char sign = (tz < 0) ? '-' : '+';
322 int zone = (tz < 0) ? (-tz) : tz;
323 fprintf(cb->newlog, "%s %s %s %lu %c%04d\t%s",
324 sha1_to_hex(osha1), sha1_to_hex(nsha1),
325 email, timestamp, sign, zone,
326 message);
327 hashcpy(cb->last_kept_sha1, nsha1);
329 if (cb->cmd->verbose)
330 printf("keep %s", message);
331 return 0;
332 prune:
333 if (!cb->newlog || cb->cmd->verbose)
334 printf("%sprune %s", cb->newlog ? "" : "would ", message);
335 return 0;
338 static int push_tip_to_list(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
340 struct commit_list **list = cb_data;
341 struct commit *tip_commit;
342 if (flags & REF_ISSYMREF)
343 return 0;
344 tip_commit = lookup_commit_reference_gently(sha1, 1);
345 if (!tip_commit)
346 return 0;
347 commit_list_insert(tip_commit, list);
348 return 0;
351 static int expire_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data)
353 struct cmd_reflog_expire_cb *cmd = cb_data;
354 struct expire_reflog_cb cb;
355 struct ref_lock *lock;
356 char *log_file, *newlog_path = NULL;
357 struct commit *tip_commit;
358 struct commit_list *tips;
359 int status = 0;
361 memset(&cb, 0, sizeof(cb));
364 * we take the lock for the ref itself to prevent it from
365 * getting updated.
367 lock = lock_any_ref_for_update(ref, sha1, 0);
368 if (!lock)
369 return error("cannot lock ref '%s'", ref);
370 log_file = git_pathdup("logs/%s", ref);
371 if (!file_exists(log_file))
372 goto finish;
373 if (!cmd->dry_run) {
374 newlog_path = git_pathdup("logs/%s.lock", ref);
375 cb.newlog = fopen(newlog_path, "w");
378 cb.cmd = cmd;
380 if (!cmd->expire_unreachable || !strcmp(ref, "HEAD")) {
381 tip_commit = NULL;
382 cb.unreachable_expire_kind = UE_HEAD;
383 } else {
384 tip_commit = lookup_commit_reference_gently(sha1, 1);
385 if (!tip_commit)
386 cb.unreachable_expire_kind = UE_ALWAYS;
387 else
388 cb.unreachable_expire_kind = UE_NORMAL;
391 if (cmd->expire_unreachable <= cmd->expire_total)
392 cb.unreachable_expire_kind = UE_ALWAYS;
394 cb.mark_list = NULL;
395 tips = NULL;
396 if (cb.unreachable_expire_kind != UE_ALWAYS) {
397 if (cb.unreachable_expire_kind == UE_HEAD) {
398 struct commit_list *elem;
399 for_each_ref(push_tip_to_list, &tips);
400 for (elem = tips; elem; elem = elem->next)
401 commit_list_insert(elem->item, &cb.mark_list);
402 } else {
403 commit_list_insert(tip_commit, &cb.mark_list);
405 cb.mark_limit = cmd->expire_total;
406 mark_reachable(&cb);
409 for_each_reflog_ent(ref, expire_reflog_ent, &cb);
411 if (cb.unreachable_expire_kind != UE_ALWAYS) {
412 if (cb.unreachable_expire_kind == UE_HEAD) {
413 struct commit_list *elem;
414 for (elem = tips; elem; elem = elem->next)
415 clear_commit_marks(tip_commit, REACHABLE);
416 free_commit_list(tips);
417 } else {
418 clear_commit_marks(tip_commit, REACHABLE);
421 finish:
422 if (cb.newlog) {
423 if (fclose(cb.newlog)) {
424 status |= error("%s: %s", strerror(errno),
425 newlog_path);
426 unlink(newlog_path);
427 } else if (cmd->updateref &&
428 (write_in_full(lock->lock_fd,
429 sha1_to_hex(cb.last_kept_sha1), 40) != 40 ||
430 write_str_in_full(lock->lock_fd, "\n") != 1 ||
431 close_ref(lock) < 0)) {
432 status |= error("Couldn't write %s",
433 lock->lk->filename);
434 unlink(newlog_path);
435 } else if (rename(newlog_path, log_file)) {
436 status |= error("cannot rename %s to %s",
437 newlog_path, log_file);
438 unlink(newlog_path);
439 } else if (cmd->updateref && commit_ref(lock)) {
440 status |= error("Couldn't set %s", lock->ref_name);
441 } else {
442 adjust_shared_perm(log_file);
445 free(newlog_path);
446 free(log_file);
447 unlock_ref(lock);
448 return status;
451 static int collect_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data)
453 struct collected_reflog *e;
454 struct collect_reflog_cb *cb = cb_data;
455 size_t namelen = strlen(ref);
457 e = xmalloc(sizeof(*e) + namelen + 1);
458 hashcpy(e->sha1, sha1);
459 memcpy(e->reflog, ref, namelen + 1);
460 ALLOC_GROW(cb->e, cb->nr + 1, cb->alloc);
461 cb->e[cb->nr++] = e;
462 return 0;
465 static struct reflog_expire_cfg {
466 struct reflog_expire_cfg *next;
467 unsigned long expire_total;
468 unsigned long expire_unreachable;
469 size_t len;
470 char pattern[FLEX_ARRAY];
471 } *reflog_expire_cfg, **reflog_expire_cfg_tail;
473 static struct reflog_expire_cfg *find_cfg_ent(const char *pattern, size_t len)
475 struct reflog_expire_cfg *ent;
477 if (!reflog_expire_cfg_tail)
478 reflog_expire_cfg_tail = &reflog_expire_cfg;
480 for (ent = reflog_expire_cfg; ent; ent = ent->next)
481 if (ent->len == len &&
482 !memcmp(ent->pattern, pattern, len))
483 return ent;
485 ent = xcalloc(1, (sizeof(*ent) + len));
486 memcpy(ent->pattern, pattern, len);
487 ent->len = len;
488 *reflog_expire_cfg_tail = ent;
489 reflog_expire_cfg_tail = &(ent->next);
490 return ent;
493 static int parse_expire_cfg_value(const char *var, const char *value, unsigned long *expire)
495 if (!value)
496 return config_error_nonbool(var);
497 if (!strcmp(value, "never") || !strcmp(value, "false")) {
498 *expire = 0;
499 return 0;
501 *expire = approxidate(value);
502 return 0;
505 /* expiry timer slot */
506 #define EXPIRE_TOTAL 01
507 #define EXPIRE_UNREACH 02
509 static int reflog_expire_config(const char *var, const char *value, void *cb)
511 const char *lastdot = strrchr(var, '.');
512 unsigned long expire;
513 int slot;
514 struct reflog_expire_cfg *ent;
516 if (!lastdot || prefixcmp(var, "gc."))
517 return git_default_config(var, value, cb);
519 if (!strcmp(lastdot, ".reflogexpire")) {
520 slot = EXPIRE_TOTAL;
521 if (parse_expire_cfg_value(var, value, &expire))
522 return -1;
523 } else if (!strcmp(lastdot, ".reflogexpireunreachable")) {
524 slot = EXPIRE_UNREACH;
525 if (parse_expire_cfg_value(var, value, &expire))
526 return -1;
527 } else
528 return git_default_config(var, value, cb);
530 if (lastdot == var + 2) {
531 switch (slot) {
532 case EXPIRE_TOTAL:
533 default_reflog_expire = expire;
534 break;
535 case EXPIRE_UNREACH:
536 default_reflog_expire_unreachable = expire;
537 break;
539 return 0;
542 ent = find_cfg_ent(var + 3, lastdot - (var+3));
543 if (!ent)
544 return -1;
545 switch (slot) {
546 case EXPIRE_TOTAL:
547 ent->expire_total = expire;
548 break;
549 case EXPIRE_UNREACH:
550 ent->expire_unreachable = expire;
551 break;
553 return 0;
556 static void set_reflog_expiry_param(struct cmd_reflog_expire_cb *cb, int slot, const char *ref)
558 struct reflog_expire_cfg *ent;
560 if (slot == (EXPIRE_TOTAL|EXPIRE_UNREACH))
561 return; /* both given explicitly -- nothing to tweak */
563 for (ent = reflog_expire_cfg; ent; ent = ent->next) {
564 if (!fnmatch(ent->pattern, ref, 0)) {
565 if (!(slot & EXPIRE_TOTAL))
566 cb->expire_total = ent->expire_total;
567 if (!(slot & EXPIRE_UNREACH))
568 cb->expire_unreachable = ent->expire_unreachable;
569 return;
574 * If unconfigured, make stash never expire
576 if (!strcmp(ref, "refs/stash")) {
577 if (!(slot & EXPIRE_TOTAL))
578 cb->expire_total = 0;
579 if (!(slot & EXPIRE_UNREACH))
580 cb->expire_unreachable = 0;
581 return;
584 /* Nothing matched -- use the default value */
585 if (!(slot & EXPIRE_TOTAL))
586 cb->expire_total = default_reflog_expire;
587 if (!(slot & EXPIRE_UNREACH))
588 cb->expire_unreachable = default_reflog_expire_unreachable;
591 static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
593 struct cmd_reflog_expire_cb cb;
594 unsigned long now = time(NULL);
595 int i, status, do_all;
596 int explicit_expiry = 0;
598 default_reflog_expire_unreachable = now - 30 * 24 * 3600;
599 default_reflog_expire = now - 90 * 24 * 3600;
600 git_config(reflog_expire_config, NULL);
602 save_commit_buffer = 0;
603 do_all = status = 0;
604 memset(&cb, 0, sizeof(cb));
606 cb.expire_total = default_reflog_expire;
607 cb.expire_unreachable = default_reflog_expire_unreachable;
609 for (i = 1; i < argc; i++) {
610 const char *arg = argv[i];
611 if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
612 cb.dry_run = 1;
613 else if (!prefixcmp(arg, "--expire=")) {
614 cb.expire_total = approxidate(arg + 9);
615 explicit_expiry |= EXPIRE_TOTAL;
617 else if (!prefixcmp(arg, "--expire-unreachable=")) {
618 cb.expire_unreachable = approxidate(arg + 21);
619 explicit_expiry |= EXPIRE_UNREACH;
621 else if (!strcmp(arg, "--stale-fix"))
622 cb.stalefix = 1;
623 else if (!strcmp(arg, "--rewrite"))
624 cb.rewrite = 1;
625 else if (!strcmp(arg, "--updateref"))
626 cb.updateref = 1;
627 else if (!strcmp(arg, "--all"))
628 do_all = 1;
629 else if (!strcmp(arg, "--verbose"))
630 cb.verbose = 1;
631 else if (!strcmp(arg, "--")) {
632 i++;
633 break;
635 else if (arg[0] == '-')
636 usage(reflog_expire_usage);
637 else
638 break;
642 * We can trust the commits and objects reachable from refs
643 * even in older repository. We cannot trust what's reachable
644 * from reflog if the repository was pruned with older git.
646 if (cb.stalefix) {
647 init_revisions(&cb.revs, prefix);
648 if (cb.verbose)
649 printf("Marking reachable objects...");
650 mark_reachable_objects(&cb.revs, 0, NULL);
651 if (cb.verbose)
652 putchar('\n');
655 if (do_all) {
656 struct collect_reflog_cb collected;
657 int i;
659 memset(&collected, 0, sizeof(collected));
660 for_each_reflog(collect_reflog, &collected);
661 for (i = 0; i < collected.nr; i++) {
662 struct collected_reflog *e = collected.e[i];
663 set_reflog_expiry_param(&cb, explicit_expiry, e->reflog);
664 status |= expire_reflog(e->reflog, e->sha1, 0, &cb);
665 free(e);
667 free(collected.e);
670 for (; i < argc; i++) {
671 char *ref;
672 unsigned char sha1[20];
673 if (!dwim_log(argv[i], strlen(argv[i]), sha1, &ref)) {
674 status |= error("%s points nowhere!", argv[i]);
675 continue;
677 set_reflog_expiry_param(&cb, explicit_expiry, ref);
678 status |= expire_reflog(ref, sha1, 0, &cb);
680 return status;
683 static int count_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
684 const char *email, unsigned long timestamp, int tz,
685 const char *message, void *cb_data)
687 struct cmd_reflog_expire_cb *cb = cb_data;
688 if (!cb->expire_total || timestamp < cb->expire_total)
689 cb->recno++;
690 return 0;
693 static int cmd_reflog_delete(int argc, const char **argv, const char *prefix)
695 struct cmd_reflog_expire_cb cb;
696 int i, status = 0;
698 memset(&cb, 0, sizeof(cb));
700 for (i = 1; i < argc; i++) {
701 const char *arg = argv[i];
702 if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
703 cb.dry_run = 1;
704 else if (!strcmp(arg, "--rewrite"))
705 cb.rewrite = 1;
706 else if (!strcmp(arg, "--updateref"))
707 cb.updateref = 1;
708 else if (!strcmp(arg, "--verbose"))
709 cb.verbose = 1;
710 else if (!strcmp(arg, "--")) {
711 i++;
712 break;
714 else if (arg[0] == '-')
715 usage(reflog_delete_usage);
716 else
717 break;
720 if (argc - i < 1)
721 return error("Nothing to delete?");
723 for ( ; i < argc; i++) {
724 const char *spec = strstr(argv[i], "@{");
725 unsigned char sha1[20];
726 char *ep, *ref;
727 int recno;
729 if (!spec) {
730 status |= error("Not a reflog: %s", argv[i]);
731 continue;
734 if (!dwim_log(argv[i], spec - argv[i], sha1, &ref)) {
735 status |= error("no reflog for '%s'", argv[i]);
736 continue;
739 recno = strtoul(spec + 2, &ep, 10);
740 if (*ep == '}') {
741 cb.recno = -recno;
742 for_each_reflog_ent(ref, count_reflog_ent, &cb);
743 } else {
744 cb.expire_total = approxidate(spec + 2);
745 for_each_reflog_ent(ref, count_reflog_ent, &cb);
746 cb.expire_total = 0;
749 status |= expire_reflog(ref, sha1, 0, &cb);
750 free(ref);
752 return status;
756 * main "reflog"
759 static const char reflog_usage[] =
760 "git reflog [ show | expire | delete ]";
762 int cmd_reflog(int argc, const char **argv, const char *prefix)
764 if (argc > 1 && !strcmp(argv[1], "-h"))
765 usage(reflog_usage);
767 /* With no command, we default to showing it. */
768 if (argc < 2 || *argv[1] == '-')
769 return cmd_log_reflog(argc, argv, prefix);
771 if (!strcmp(argv[1], "show"))
772 return cmd_log_reflog(argc - 1, argv + 1, prefix);
774 if (!strcmp(argv[1], "expire"))
775 return cmd_reflog_expire(argc - 1, argv + 1, prefix);
777 if (!strcmp(argv[1], "delete"))
778 return cmd_reflog_delete(argc - 1, argv + 1, prefix);
780 return cmd_log_reflog(argc, argv, prefix);