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-rw-r--r--builtin-reflog.c212
1 files changed, 212 insertions, 0 deletions
diff --git a/builtin-reflog.c b/builtin-reflog.c
new file mode 100644
index 0000000000..de31967b99
--- /dev/null
+++ b/builtin-reflog.c
@@ -0,0 +1,212 @@
+#include "cache.h"
+#include "builtin.h"
+#include "commit.h"
+#include "refs.h"
+#include "dir.h"
+#include "tree-walk.h"
+
+struct expire_reflog_cb {
+ FILE *newlog;
+ const char *ref;
+ struct commit *ref_commit;
+ unsigned long expire_total;
+ unsigned long expire_unreachable;
+};
+
+static int tree_is_complete(const unsigned char *sha1)
+{
+ struct tree_desc desc;
+ void *buf;
+ char type[20];
+
+ buf = read_sha1_file(sha1, type, &desc.size);
+ if (!buf)
+ return 0;
+ desc.buf = buf;
+ while (desc.size) {
+ const unsigned char *elem;
+ const char *name;
+ unsigned mode;
+
+ elem = tree_entry_extract(&desc, &name, &mode);
+ if (!has_sha1_file(elem) ||
+ (S_ISDIR(mode) && !tree_is_complete(elem))) {
+ free(buf);
+ return 0;
+ }
+ update_tree_entry(&desc);
+ }
+ free(buf);
+ return 1;
+}
+
+static int keep_entry(struct commit **it, unsigned char *sha1)
+{
+ struct commit *commit;
+
+ *it = NULL;
+ 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. */
+ parse_object(commit->object.sha1);
+ if (!tree_is_complete(commit->tree->object.sha1))
+ return 0;
+ *it = commit;
+ return 1;
+}
+
+static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
+ char *data, void *cb_data)
+{
+ struct expire_reflog_cb *cb = cb_data;
+ unsigned long timestamp;
+ char *cp, *ep;
+ struct commit *old, *new;
+
+ cp = strchr(data, '>');
+ if (!cp || *++cp != ' ')
+ goto prune;
+ timestamp = strtoul(cp, &ep, 10);
+ if (*ep != ' ')
+ goto prune;
+ if (timestamp < cb->expire_total)
+ goto prune;
+
+ if (!keep_entry(&old, osha1) || !keep_entry(&new, nsha1))
+ goto prune;
+
+ if ((timestamp < cb->expire_unreachable) &&
+ (!cb->ref_commit ||
+ (old && !in_merge_bases(old, cb->ref_commit)) ||
+ (new && !in_merge_bases(new, cb->ref_commit))))
+ goto prune;
+
+ if (cb->newlog)
+ fprintf(cb->newlog, "%s %s %s",
+ sha1_to_hex(osha1), sha1_to_hex(nsha1), data);
+ return 0;
+ prune:
+ if (!cb->newlog)
+ fprintf(stderr, "would prune %s", data);
+ return 0;
+}
+
+struct cmd_reflog_expire_cb {
+ int dry_run;
+ unsigned long expire_total;
+ unsigned long expire_unreachable;
+};
+
+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 *newlog_path = NULL;
+ int status = 0;
+
+ if (strncmp(ref, "refs/", 5))
+ return error("not a ref '%s'", ref);
+
+ memset(&cb, 0, sizeof(cb));
+ /* we take the lock for the ref itself to prevent it from
+ * getting updated.
+ */
+ lock = lock_ref_sha1(ref + 5, sha1);
+ if (!lock)
+ return error("cannot lock ref '%s'", ref);
+ if (!file_exists(lock->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);
+ if (!cb.ref_commit)
+ fprintf(stderr,
+ "warning: ref '%s' does not point at a commit\n", ref);
+ cb.ref = ref;
+ cb.expire_total = cmd->expire_total;
+ cb.expire_unreachable = cmd->expire_unreachable;
+ 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, lock->log_file)) {
+ status |= error("cannot rename %s to %s",
+ newlog_path, lock->log_file);
+ unlink(newlog_path);
+ }
+ }
+ free(newlog_path);
+ unlock_ref(lock);
+ return status;
+}
+
+static const char reflog_expire_usage[] =
+"git-reflog expire [--dry-run] [--expire=<time>] [--expire-unreachable=<time>] [--all] <refs>...";
+
+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;
+
+ save_commit_buffer = 0;
+ do_all = status = 0;
+ memset(&cb, 0, sizeof(cb));
+ cb.expire_total = now - 90 * 24 * 3600;
+ cb.expire_unreachable = now - 30 * 24 * 3600;
+
+ 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 (!strncmp(arg, "--expire=", 9))
+ cb.expire_total = approxidate(arg + 9);
+ else if (!strncmp(arg, "--expire-unreachable=", 21))
+ cb.expire_unreachable = approxidate(arg + 21);
+ else if (!strcmp(arg, "--all"))
+ do_all = 1;
+ else if (!strcmp(arg, "--")) {
+ i++;
+ break;
+ }
+ else if (arg[0] == '-')
+ usage(reflog_expire_usage);
+ else
+ break;
+ }
+ if (do_all)
+ status |= for_each_ref(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;
+}
+
+static const char reflog_usage[] =
+"git-reflog (expire | ...)";
+
+int cmd_reflog(int argc, const char **argv, const char *prefix)
+{
+ if (argc < 2)
+ usage(reflog_usage);
+ else if (!strcmp(argv[1], "expire"))
+ return cmd_reflog_expire(argc - 1, argv + 1, prefix);
+ else
+ usage(reflog_usage);
+}