| #include "cache.h" |
| #include "builtin.h" |
| #include "commit.h" |
| #include "refs.h" |
| #include "dir.h" |
| #include "tree-walk.h" |
| #include "diff.h" |
| #include "revision.h" |
| #include "reachable.h" |
| |
| /* |
| * reflog expire |
| */ |
| |
| static const char reflog_expire_usage[] = |
| "git reflog (show|expire) [--verbose] [--dry-run] [--stale-fix] [--expire=<time>] [--expire-unreachable=<time>] [--all] <refs>..."; |
| static const char reflog_delete_usage[] = |
| "git reflog delete [--verbose] [--dry-run] [--rewrite] [--updateref] <refs>..."; |
| |
| static unsigned long default_reflog_expire; |
| static unsigned long default_reflog_expire_unreachable; |
| |
| struct cmd_reflog_expire_cb { |
| struct rev_info revs; |
| int dry_run; |
| int stalefix; |
| int rewrite; |
| int updateref; |
| int verbose; |
| unsigned long expire_total; |
| unsigned long expire_unreachable; |
| int recno; |
| }; |
| |
| struct expire_reflog_cb { |
| FILE *newlog; |
| const char *ref; |
| struct commit *ref_commit; |
| struct cmd_reflog_expire_cb *cmd; |
| unsigned char last_kept_sha1[20]; |
| }; |
| |
| struct collected_reflog { |
| unsigned char sha1[20]; |
| char reflog[FLEX_ARRAY]; |
| }; |
| struct collect_reflog_cb { |
| struct collected_reflog **e; |
| int alloc; |
| int nr; |
| }; |
| |
| #define INCOMPLETE (1u<<10) |
| #define STUDYING (1u<<11) |
| #define REACHABLE (1u<<12) |
| |
| static int tree_is_complete(const unsigned char *sha1) |
| { |
| struct tree_desc desc; |
| struct name_entry entry; |
| int complete; |
| struct tree *tree; |
| |
| tree = lookup_tree(sha1); |
| if (!tree) |
| return 0; |
| if (tree->object.flags & SEEN) |
| return 1; |
| if (tree->object.flags & INCOMPLETE) |
| return 0; |
| |
| if (!tree->buffer) { |
| enum object_type type; |
| unsigned long size; |
| void *data = read_sha1_file(sha1, &type, &size); |
| if (!data) { |
| tree->object.flags |= INCOMPLETE; |
| return 0; |
| } |
| tree->buffer = data; |
| tree->size = size; |
| } |
| init_tree_desc(&desc, tree->buffer, tree->size); |
| complete = 1; |
| while (tree_entry(&desc, &entry)) { |
| if (!has_sha1_file(entry.sha1) || |
| (S_ISDIR(entry.mode) && !tree_is_complete(entry.sha1))) { |
| tree->object.flags |= INCOMPLETE; |
| complete = 0; |
| } |
| } |
| free(tree->buffer); |
| tree->buffer = NULL; |
| |
| if (complete) |
| tree->object.flags |= SEEN; |
| return complete; |
| } |
| |
| static int commit_is_complete(struct commit *commit) |
| { |
| struct object_array study; |
| struct object_array found; |
| int is_incomplete = 0; |
| int i; |
| |
| /* early return */ |
| if (commit->object.flags & SEEN) |
| return 1; |
| if (commit->object.flags & INCOMPLETE) |
| return 0; |
| /* |
| * Find all commits that are reachable and are not marked as |
| * SEEN. Then make sure the trees and blobs contained are |
| * complete. After that, mark these commits also as SEEN. |
| * If some of the objects that are needed to complete this |
| * commit are missing, mark this commit as INCOMPLETE. |
| */ |
| memset(&study, 0, sizeof(study)); |
| memset(&found, 0, sizeof(found)); |
| add_object_array(&commit->object, NULL, &study); |
| add_object_array(&commit->object, NULL, &found); |
| commit->object.flags |= STUDYING; |
| while (study.nr) { |
| struct commit *c; |
| struct commit_list *parent; |
| |
| c = (struct commit *)study.objects[--study.nr].item; |
| if (!c->object.parsed && !parse_object(c->object.sha1)) |
| c->object.flags |= INCOMPLETE; |
| |
| if (c->object.flags & INCOMPLETE) { |
| is_incomplete = 1; |
| break; |
| } |
| else if (c->object.flags & SEEN) |
| continue; |
| for (parent = c->parents; parent; parent = parent->next) { |
| struct commit *p = parent->item; |
| if (p->object.flags & STUDYING) |
| continue; |
| p->object.flags |= STUDYING; |
| add_object_array(&p->object, NULL, &study); |
| add_object_array(&p->object, NULL, &found); |
| } |
| } |
| if (!is_incomplete) { |
| /* |
| * make sure all commits in "found" array have all the |
| * necessary objects. |
| */ |
| for (i = 0; i < found.nr; i++) { |
| struct commit *c = |
| (struct commit *)found.objects[i].item; |
| if (!tree_is_complete(c->tree->object.sha1)) { |
| is_incomplete = 1; |
| c->object.flags |= INCOMPLETE; |
| } |
| } |
| if (!is_incomplete) { |
| /* mark all found commits as complete, iow SEEN */ |
| for (i = 0; i < found.nr; i++) |
| found.objects[i].item->flags |= SEEN; |
| } |
| } |
| /* clear flags from the objects we traversed */ |
| for (i = 0; i < found.nr; i++) |
| found.objects[i].item->flags &= ~STUDYING; |
| if (is_incomplete) |
| commit->object.flags |= INCOMPLETE; |
| else { |
| /* |
| * If we come here, we have (1) traversed the ancestry chain |
| * from the "commit" until we reach SEEN commits (which are |
| * known to be complete), and (2) made sure that the commits |
| * encountered during the above traversal refer to trees that |
| * are complete. Which means that we know *all* the commits |
| * we have seen during this process are complete. |
| */ |
| for (i = 0; i < found.nr; i++) |
| found.objects[i].item->flags |= SEEN; |
| } |
| /* free object arrays */ |
| free(study.objects); |
| free(found.objects); |
| return !is_incomplete; |
| } |
| |
| static int keep_entry(struct commit **it, unsigned char *sha1) |
| { |
| struct commit *commit; |
| |
| if (is_null_sha1(sha1)) |
| return 1; |
| commit = lookup_commit_reference_gently(sha1, 1); |
| if (!commit) |
| return 0; |
| |
| /* |
| * Make sure everything in this commit exists. |
| * |
| * We have walked all the objects reachable from the refs |
| * and cache earlier. The commits reachable by this commit |
| * must meet SEEN commits -- and then we should mark them as |
| * SEEN as well. |
| */ |
| if (!commit_is_complete(commit)) |
| return 0; |
| *it = commit; |
| return 1; |
| } |
| |
| static int unreachable(struct expire_reflog_cb *cb, struct commit *commit, unsigned char *sha1) |
| { |
| /* |
| * We may or may not have the commit yet - if not, look it |
| * up using the supplied sha1. |
| */ |
| if (!commit) { |
| if (is_null_sha1(sha1)) |
| return 0; |
| |
| commit = lookup_commit_reference_gently(sha1, 1); |
| |
| /* Not a commit -- keep it */ |
| if (!commit) |
| return 0; |
| } |
| |
| /* Reachable from the current ref? Don't prune. */ |
| if (commit->object.flags & REACHABLE) |
| return 0; |
| if (in_merge_bases(commit, &cb->ref_commit, 1)) |
| return 0; |
| |
| /* We can't reach it - prune it. */ |
| return 1; |
| } |
| |
| static void mark_reachable(struct commit *commit, unsigned long expire_limit) |
| { |
| /* |
| * We need to compute whether the commit on either side of a reflog |
| * entry is reachable from the tip of the ref for all entries. |
| * Mark commits that are reachable from the tip down to the |
| * time threshold first; we know a commit marked thusly is |
| * reachable from the tip without running in_merge_bases() |
| * at all. |
| */ |
| struct commit_list *pending = NULL; |
| |
| commit_list_insert(commit, &pending); |
| while (pending) { |
| struct commit_list *entry = pending; |
| struct commit_list *parent; |
| pending = entry->next; |
| commit = entry->item; |
| free(entry); |
| if (commit->object.flags & REACHABLE) |
| continue; |
| if (parse_commit(commit)) |
| continue; |
| commit->object.flags |= REACHABLE; |
| if (commit->date < expire_limit) |
| continue; |
| parent = commit->parents; |
| while (parent) { |
| commit = parent->item; |
| parent = parent->next; |
| if (commit->object.flags & REACHABLE) |
| continue; |
| commit_list_insert(commit, &pending); |
| } |
| } |
| } |
| |
| static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1, |
| const char *email, unsigned long timestamp, int tz, |
| const char *message, void *cb_data) |
| { |
| struct expire_reflog_cb *cb = cb_data; |
| struct commit *old, *new; |
| |
| if (timestamp < cb->cmd->expire_total) |
| goto prune; |
| |
| if (cb->cmd->rewrite) |
| osha1 = cb->last_kept_sha1; |
| |
| old = new = NULL; |
| if (cb->cmd->stalefix && |
| (!keep_entry(&old, osha1) || !keep_entry(&new, nsha1))) |
| goto prune; |
| |
| if (timestamp < cb->cmd->expire_unreachable) { |
| if (!cb->ref_commit) |
| goto prune; |
| if (unreachable(cb, old, osha1) || unreachable(cb, new, nsha1)) |
| goto prune; |
| } |
| |
| if (cb->cmd->recno && --(cb->cmd->recno) == 0) |
| goto prune; |
| |
| if (cb->newlog) { |
| char sign = (tz < 0) ? '-' : '+'; |
| int zone = (tz < 0) ? (-tz) : tz; |
| fprintf(cb->newlog, "%s %s %s %lu %c%04d\t%s", |
| sha1_to_hex(osha1), sha1_to_hex(nsha1), |
| email, timestamp, sign, zone, |
| message); |
| hashcpy(cb->last_kept_sha1, nsha1); |
| } |
| if (cb->cmd->verbose) |
| printf("keep %s", message); |
| return 0; |
| prune: |
| if (!cb->newlog || cb->cmd->verbose) |
| printf("%sprune %s", cb->newlog ? "" : "would ", message); |
| return 0; |
| } |
| |
| static int expire_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data) |
| { |
| struct cmd_reflog_expire_cb *cmd = cb_data; |
| struct expire_reflog_cb cb; |
| struct ref_lock *lock; |
| char *log_file, *newlog_path = NULL; |
| int status = 0; |
| |
| memset(&cb, 0, sizeof(cb)); |
| |
| /* |
| * we take the lock for the ref itself to prevent it from |
| * getting updated. |
| */ |
| lock = lock_any_ref_for_update(ref, sha1, 0); |
| if (!lock) |
| return error("cannot lock ref '%s'", ref); |
| log_file = git_pathdup("logs/%s", ref); |
| if (!file_exists(log_file)) |
| goto finish; |
| if (!cmd->dry_run) { |
| newlog_path = git_pathdup("logs/%s.lock", ref); |
| cb.newlog = fopen(newlog_path, "w"); |
| } |
| |
| cb.ref_commit = lookup_commit_reference_gently(sha1, 1); |
| cb.ref = ref; |
| cb.cmd = cmd; |
| if (cb.ref_commit) |
| mark_reachable(cb.ref_commit, cmd->expire_total); |
| for_each_reflog_ent(ref, expire_reflog_ent, &cb); |
| if (cb.ref_commit) |
| clear_commit_marks(cb.ref_commit, REACHABLE); |
| finish: |
| if (cb.newlog) { |
| if (fclose(cb.newlog)) { |
| status |= error("%s: %s", strerror(errno), |
| newlog_path); |
| unlink(newlog_path); |
| } else if (cmd->updateref && |
| (write_in_full(lock->lock_fd, |
| sha1_to_hex(cb.last_kept_sha1), 40) != 40 || |
| write_in_full(lock->lock_fd, "\n", 1) != 1 || |
| close_ref(lock) < 0)) { |
| status |= error("Couldn't write %s", |
| lock->lk->filename); |
| unlink(newlog_path); |
| } else if (rename(newlog_path, log_file)) { |
| status |= error("cannot rename %s to %s", |
| newlog_path, log_file); |
| unlink(newlog_path); |
| } else if (cmd->updateref && commit_ref(lock)) { |
| status |= error("Couldn't set %s", lock->ref_name); |
| } else { |
| adjust_shared_perm(log_file); |
| } |
| } |
| free(newlog_path); |
| free(log_file); |
| unlock_ref(lock); |
| return status; |
| } |
| |
| static int collect_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data) |
| { |
| struct collected_reflog *e; |
| struct collect_reflog_cb *cb = cb_data; |
| size_t namelen = strlen(ref); |
| |
| e = xmalloc(sizeof(*e) + namelen + 1); |
| hashcpy(e->sha1, sha1); |
| memcpy(e->reflog, ref, namelen + 1); |
| ALLOC_GROW(cb->e, cb->nr + 1, cb->alloc); |
| cb->e[cb->nr++] = e; |
| return 0; |
| } |
| |
| static struct reflog_expire_cfg { |
| struct reflog_expire_cfg *next; |
| unsigned long expire_total; |
| unsigned long expire_unreachable; |
| size_t len; |
| char pattern[FLEX_ARRAY]; |
| } *reflog_expire_cfg, **reflog_expire_cfg_tail; |
| |
| static struct reflog_expire_cfg *find_cfg_ent(const char *pattern, size_t len) |
| { |
| struct reflog_expire_cfg *ent; |
| |
| if (!reflog_expire_cfg_tail) |
| reflog_expire_cfg_tail = &reflog_expire_cfg; |
| |
| for (ent = reflog_expire_cfg; ent; ent = ent->next) |
| if (ent->len == len && |
| !memcmp(ent->pattern, pattern, len)) |
| return ent; |
| |
| ent = xcalloc(1, (sizeof(*ent) + len)); |
| memcpy(ent->pattern, pattern, len); |
| ent->len = len; |
| *reflog_expire_cfg_tail = ent; |
| reflog_expire_cfg_tail = &(ent->next); |
| return ent; |
| } |
| |
| static int parse_expire_cfg_value(const char *var, const char *value, unsigned long *expire) |
| { |
| if (!value) |
| return config_error_nonbool(var); |
| if (!strcmp(value, "never") || !strcmp(value, "false")) { |
| *expire = 0; |
| return 0; |
| } |
| *expire = approxidate(value); |
| return 0; |
| } |
| |
| /* expiry timer slot */ |
| #define EXPIRE_TOTAL 01 |
| #define EXPIRE_UNREACH 02 |
| |
| static int reflog_expire_config(const char *var, const char *value, void *cb) |
| { |
| const char *lastdot = strrchr(var, '.'); |
| unsigned long expire; |
| int slot; |
| struct reflog_expire_cfg *ent; |
| |
| if (!lastdot || prefixcmp(var, "gc.")) |
| return git_default_config(var, value, cb); |
| |
| if (!strcmp(lastdot, ".reflogexpire")) { |
| slot = EXPIRE_TOTAL; |
| if (parse_expire_cfg_value(var, value, &expire)) |
| return -1; |
| } else if (!strcmp(lastdot, ".reflogexpireunreachable")) { |
| slot = EXPIRE_UNREACH; |
| if (parse_expire_cfg_value(var, value, &expire)) |
| return -1; |
| } else |
| return git_default_config(var, value, cb); |
| |
| if (lastdot == var + 2) { |
| switch (slot) { |
| case EXPIRE_TOTAL: |
| default_reflog_expire = expire; |
| break; |
| case EXPIRE_UNREACH: |
| default_reflog_expire_unreachable = expire; |
| break; |
| } |
| return 0; |
| } |
| |
| ent = find_cfg_ent(var + 3, lastdot - (var+3)); |
| if (!ent) |
| return -1; |
| switch (slot) { |
| case EXPIRE_TOTAL: |
| ent->expire_total = expire; |
| break; |
| case EXPIRE_UNREACH: |
| ent->expire_unreachable = expire; |
| break; |
| } |
| return 0; |
| } |
| |
| static void set_reflog_expiry_param(struct cmd_reflog_expire_cb *cb, int slot, const char *ref) |
| { |
| struct reflog_expire_cfg *ent; |
| |
| if (slot == (EXPIRE_TOTAL|EXPIRE_UNREACH)) |
| return; /* both given explicitly -- nothing to tweak */ |
| |
| for (ent = reflog_expire_cfg; ent; ent = ent->next) { |
| if (!fnmatch(ent->pattern, ref, 0)) { |
| if (!(slot & EXPIRE_TOTAL)) |
| cb->expire_total = ent->expire_total; |
| if (!(slot & EXPIRE_UNREACH)) |
| cb->expire_unreachable = ent->expire_unreachable; |
| return; |
| } |
| } |
| |
| /* |
| * If unconfigured, make stash never expire |
| */ |
| if (!strcmp(ref, "refs/stash")) { |
| if (!(slot & EXPIRE_TOTAL)) |
| cb->expire_total = 0; |
| if (!(slot & EXPIRE_UNREACH)) |
| cb->expire_unreachable = 0; |
| return; |
| } |
| |
| /* Nothing matched -- use the default value */ |
| if (!(slot & EXPIRE_TOTAL)) |
| cb->expire_total = default_reflog_expire; |
| if (!(slot & EXPIRE_UNREACH)) |
| cb->expire_unreachable = default_reflog_expire_unreachable; |
| } |
| |
| static int cmd_reflog_expire(int argc, const char **argv, const char *prefix) |
| { |
| struct cmd_reflog_expire_cb cb; |
| unsigned long now = time(NULL); |
| int i, status, do_all; |
| int explicit_expiry = 0; |
| |
| git_config(reflog_expire_config, NULL); |
| |
| save_commit_buffer = 0; |
| do_all = status = 0; |
| memset(&cb, 0, sizeof(cb)); |
| |
| if (!default_reflog_expire_unreachable) |
| default_reflog_expire_unreachable = now - 30 * 24 * 3600; |
| if (!default_reflog_expire) |
| default_reflog_expire = now - 90 * 24 * 3600; |
| cb.expire_total = default_reflog_expire; |
| cb.expire_unreachable = default_reflog_expire_unreachable; |
| |
| for (i = 1; i < argc; i++) { |
| const char *arg = argv[i]; |
| if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n")) |
| cb.dry_run = 1; |
| else if (!prefixcmp(arg, "--expire=")) { |
| cb.expire_total = approxidate(arg + 9); |
| explicit_expiry |= EXPIRE_TOTAL; |
| } |
| else if (!prefixcmp(arg, "--expire-unreachable=")) { |
| cb.expire_unreachable = approxidate(arg + 21); |
| explicit_expiry |= EXPIRE_UNREACH; |
| } |
| else if (!strcmp(arg, "--stale-fix")) |
| cb.stalefix = 1; |
| else if (!strcmp(arg, "--rewrite")) |
| cb.rewrite = 1; |
| else if (!strcmp(arg, "--updateref")) |
| cb.updateref = 1; |
| else if (!strcmp(arg, "--all")) |
| do_all = 1; |
| else if (!strcmp(arg, "--verbose")) |
| cb.verbose = 1; |
| else if (!strcmp(arg, "--")) { |
| i++; |
| break; |
| } |
| else if (arg[0] == '-') |
| usage(reflog_expire_usage); |
| else |
| break; |
| } |
| |
| /* |
| * We can trust the commits and objects reachable from refs |
| * even in older repository. We cannot trust what's reachable |
| * from reflog if the repository was pruned with older git. |
| */ |
| if (cb.stalefix) { |
| init_revisions(&cb.revs, prefix); |
| if (cb.verbose) |
| printf("Marking reachable objects..."); |
| mark_reachable_objects(&cb.revs, 0); |
| if (cb.verbose) |
| putchar('\n'); |
| } |
| |
| if (do_all) { |
| struct collect_reflog_cb collected; |
| int i; |
| |
| memset(&collected, 0, sizeof(collected)); |
| for_each_reflog(collect_reflog, &collected); |
| for (i = 0; i < collected.nr; i++) { |
| struct collected_reflog *e = collected.e[i]; |
| set_reflog_expiry_param(&cb, explicit_expiry, e->reflog); |
| status |= expire_reflog(e->reflog, e->sha1, 0, &cb); |
| free(e); |
| } |
| free(collected.e); |
| } |
| |
| for (; i < argc; i++) { |
| char *ref; |
| unsigned char sha1[20]; |
| if (!dwim_log(argv[i], strlen(argv[i]), sha1, &ref)) { |
| status |= error("%s points nowhere!", argv[i]); |
| continue; |
| } |
| set_reflog_expiry_param(&cb, explicit_expiry, ref); |
| status |= expire_reflog(ref, sha1, 0, &cb); |
| } |
| return status; |
| } |
| |
| static int count_reflog_ent(unsigned char *osha1, unsigned char *nsha1, |
| const char *email, unsigned long timestamp, int tz, |
| const char *message, void *cb_data) |
| { |
| struct cmd_reflog_expire_cb *cb = cb_data; |
| if (!cb->expire_total || timestamp < cb->expire_total) |
| cb->recno++; |
| return 0; |
| } |
| |
| static int cmd_reflog_delete(int argc, const char **argv, const char *prefix) |
| { |
| struct cmd_reflog_expire_cb cb; |
| int i, status = 0; |
| |
| memset(&cb, 0, sizeof(cb)); |
| |
| for (i = 1; i < argc; i++) { |
| const char *arg = argv[i]; |
| if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n")) |
| cb.dry_run = 1; |
| else if (!strcmp(arg, "--rewrite")) |
| cb.rewrite = 1; |
| else if (!strcmp(arg, "--updateref")) |
| cb.updateref = 1; |
| else if (!strcmp(arg, "--verbose")) |
| cb.verbose = 1; |
| else if (!strcmp(arg, "--")) { |
| i++; |
| break; |
| } |
| else if (arg[0] == '-') |
| usage(reflog_delete_usage); |
| else |
| break; |
| } |
| |
| if (argc - i < 1) |
| return error("Nothing to delete?"); |
| |
| for ( ; i < argc; i++) { |
| const char *spec = strstr(argv[i], "@{"); |
| unsigned char sha1[20]; |
| char *ep, *ref; |
| int recno; |
| |
| if (!spec) { |
| status |= error("Not a reflog: %s", argv[i]); |
| continue; |
| } |
| |
| if (!dwim_log(argv[i], spec - argv[i], sha1, &ref)) { |
| status |= error("no reflog for '%s'", argv[i]); |
| continue; |
| } |
| |
| recno = strtoul(spec + 2, &ep, 10); |
| if (*ep == '}') { |
| cb.recno = -recno; |
| for_each_reflog_ent(ref, count_reflog_ent, &cb); |
| } else { |
| cb.expire_total = approxidate(spec + 2); |
| for_each_reflog_ent(ref, count_reflog_ent, &cb); |
| cb.expire_total = 0; |
| } |
| |
| status |= expire_reflog(ref, sha1, 0, &cb); |
| free(ref); |
| } |
| return status; |
| } |
| |
| /* |
| * main "reflog" |
| */ |
| |
| static const char reflog_usage[] = |
| "git reflog [ show | expire | delete ]"; |
| |
| int cmd_reflog(int argc, const char **argv, const char *prefix) |
| { |
| /* With no command, we default to showing it. */ |
| if (argc < 2 || *argv[1] == '-') |
| return cmd_log_reflog(argc, argv, prefix); |
| |
| if (!strcmp(argv[1], "show")) |
| return cmd_log_reflog(argc - 1, argv + 1, prefix); |
| |
| if (!strcmp(argv[1], "expire")) |
| return cmd_reflog_expire(argc - 1, argv + 1, prefix); |
| |
| if (!strcmp(argv[1], "delete")) |
| return cmd_reflog_delete(argc - 1, argv + 1, prefix); |
| |
| /* Not a recognized reflog command..*/ |
| usage(reflog_usage); |
| } |