#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 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 verbose; unsigned long expire_total; unsigned long expire_unreachable; }; struct expire_reflog_cb { FILE *newlog; const char *ref; struct commit *ref_commit; struct cmd_reflog_expire_cb *cmd; }; #define INCOMPLETE (1u<<10) #define STUDYING (1u<<11) 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 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; 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 (!old && !is_null_sha1(osha1)) old = lookup_commit_reference_gently(osha1, 1); if (!new && !is_null_sha1(nsha1)) new = lookup_commit_reference_gently(nsha1, 1); if ((old && !in_merge_bases(old, &cb->ref_commit, 1)) || (new && !in_merge_bases(new, &cb->ref_commit, 1))) 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); } 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 = xstrdup(git_path("logs/%s", ref)); if (!file_exists(log_file)) goto finish; if (!cmd->dry_run) { newlog_path = xstrdup(git_path("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; for_each_reflog_ent(ref, expire_reflog_ent, &cb); finish: if (cb.newlog) { if (fclose(cb.newlog)) status |= error("%s: %s", strerror(errno), newlog_path); if (rename(newlog_path, log_file)) { status |= error("cannot rename %s to %s", newlog_path, log_file); unlink(newlog_path); } } free(newlog_path); free(log_file); unlock_ref(lock); return status; } static int reflog_expire_config(const char *var, const char *value) { if (!strcmp(var, "gc.reflogexpire")) default_reflog_expire = approxidate(value); else if (!strcmp(var, "gc.reflogexpireunreachable")) default_reflog_expire_unreachable = approxidate(value); else return git_default_config(var, value); return 0; } 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; git_config(reflog_expire_config); 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; /* * 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. */ 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); else if (!prefixcmp(arg, "--expire-unreachable=")) cb.expire_unreachable = approxidate(arg + 21); else if (!strcmp(arg, "--stale-fix")) cb.stalefix = 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; } 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) status |= for_each_reflog(expire_reflog, &cb); while (i < argc) { const char *ref = argv[i++]; unsigned char sha1[20]; if (!resolve_ref(ref, sha1, 1, NULL)) { status |= error("%s points nowhere!", ref); continue; } status |= expire_reflog(ref, sha1, 0, &cb); } return status; } /* * main "reflog" */ static const char reflog_usage[] = "git-reflog (expire | ...)"; 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); /* Not a recognized reflog command..*/ usage(reflog_usage); }