1 files changed, 59 insertions, 10 deletions

diff --git a/builtin/reflog.c b/builtin/reflog.c
index f73215686d..ebf610e64a 100644
--- a/builtin/reflog.c
+++ b/builtin/reflog.c
@@ -34,8 +34,11 @@ struct cmd_reflog_expire_cb {
 
 struct expire_reflog_cb {
 	FILE *newlog;
-	const char *ref;
-	struct commit *ref_commit;
+	enum {
+		UE_NORMAL,
+		UE_ALWAYS,
+		UE_HEAD
+	} unreachable_expire_kind;
 	struct commit_list *mark_list;
 	unsigned long mark_limit;
 	struct cmd_reflog_expire_cb *cmd;
@@ -305,7 +308,7 @@ static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 		goto prune;
 
 	if (timestamp < cb->cmd->expire_unreachable) {
-		if (!cb->ref_commit)
+		if (cb->unreachable_expire_kind == UE_ALWAYS)
 			goto prune;
 		if (unreachable(cb, old, osha1) || unreachable(cb, new, nsha1))
 			goto prune;
@@ -332,12 +335,27 @@ static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 	return 0;
 }
 
+static int push_tip_to_list(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
+{
+	struct commit_list **list = cb_data;
+	struct commit *tip_commit;
+	if (flags & REF_ISSYMREF)
+		return 0;
+	tip_commit = lookup_commit_reference_gently(sha1, 1);
+	if (!tip_commit)
+		return 0;
+	commit_list_insert(tip_commit, list);
+	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;
+	struct commit *tip_commit;
+	struct commit_list *tips;
 	int status = 0;
 
 	memset(&cb, 0, sizeof(cb));
@@ -357,18 +375,49 @@ static int expire_reflog(const char *ref, const unsigned char *sha1, int unused,
 		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) {
-		cb.mark_list = NULL;
-		commit_list_insert(cb.ref_commit, &cb.mark_list);
+
+	if (!cmd->expire_unreachable || !strcmp(ref, "HEAD")) {
+		tip_commit = NULL;
+		cb.unreachable_expire_kind = UE_HEAD;
+	} else {
+		tip_commit = lookup_commit_reference_gently(sha1, 1);
+		if (!tip_commit)
+			cb.unreachable_expire_kind = UE_ALWAYS;
+		else
+			cb.unreachable_expire_kind = UE_NORMAL;
+	}
+
+	if (cmd->expire_unreachable <= cmd->expire_total)
+		cb.unreachable_expire_kind = UE_ALWAYS;
+
+	cb.mark_list = NULL;
+	tips = NULL;
+	if (cb.unreachable_expire_kind != UE_ALWAYS) {
+		if (cb.unreachable_expire_kind == UE_HEAD) {
+			struct commit_list *elem;
+			for_each_ref(push_tip_to_list, &tips);
+			for (elem = tips; elem; elem = elem->next)
+				commit_list_insert(elem->item, &cb.mark_list);
+		} else {
+			commit_list_insert(tip_commit, &cb.mark_list);
+		}
 		cb.mark_limit = cmd->expire_total;
 		mark_reachable(&cb);
 	}
+
 	for_each_reflog_ent(ref, expire_reflog_ent, &cb);
-	if (cb.ref_commit)
-		clear_commit_marks(cb.ref_commit, REACHABLE);
+
+	if (cb.unreachable_expire_kind != UE_ALWAYS) {
+		if (cb.unreachable_expire_kind == UE_HEAD) {
+			struct commit_list *elem;
+			for (elem = tips; elem; elem = elem->next)
+				clear_commit_marks(tip_commit, REACHABLE);
+			free_commit_list(tips);
+		} else {
+			clear_commit_marks(tip_commit, REACHABLE);
+		}
+	}
  finish:
 	if (cb.newlog) {
 		if (fclose(cb.newlog)) {