#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_str_in_full(lock->lock_fd, "\n") != 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) { if (argc > 1 && !strcmp(argv[1], "-h")) usage(reflog_usage); /* 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); }