http-push: remove remote locks on exit signals

If locks are not cleaned up the repository is inaccessible for 10 minutes.
Signed-off-by: NClemens Buchacher <drizzd@aon.at>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

http-push.c

@@ -1349,6 +1349,24 @@ static int unlock_remote(struct remote_lock *lock)
 	return rc;
 }
 
+static void remove_locks(void)
+{
+	struct remote_lock *lock = remote->locks;
+
+	fprintf(stderr, "Removing remote locks...\n");
+	while (lock) {
+		unlock_remote(lock);
+		lock = lock->next;
+	}
+}
+
+static void remove_locks_on_signal(int signo)
+{
+	remove_locks();
+	signal(signo, SIG_DFL);
+	raise(signo);
+}
+
 static void remote_ls(const char *path, int flags,
 		      void (*userFunc)(struct remote_ls_ctx *ls),
 		      void *userData);
@@ -2256,6 +2274,10 @@ int main(int argc, char **argv)
 		goto cleanup;
 	}
 
+	signal(SIGINT, remove_locks_on_signal);
+	signal(SIGHUP, remove_locks_on_signal);
+	signal(SIGQUIT, remove_locks_on_signal);
+
 	/* Check whether the remote has server info files */
 	remote->can_update_info_refs = 0;
 	remote->has_info_refs = remote_exists("info/refs");