From b61b8640947d44c4521d60744d7538e0515a3729 Mon Sep 17 00:00:00 2001
From: Girish Ramakrishnan <girish@cloudron.io>
Date: Sat, 17 Oct 2015 13:57:19 -0700
Subject: [PATCH] make callback noop

---
 src/janitor.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/janitor.js b/src/janitor.js
index 2802e11b0..2f0ca9994 100644
--- a/src/janitor.js
+++ b/src/janitor.js
@@ -12,6 +12,8 @@ exports = module.exports = {
     cleanupDockerVolumes: cleanupDockerVolumes
 };
 
+var NOOP_CALLBACK = function () { };
+
 function ignoreError(func) {
     return function (callback) {
         func(function (error) {
@@ -83,6 +85,8 @@ function cleanupTmpVolume(containerInfo, callback) {
 function cleanupDockerVolumes(callback) {
     assert(!callback || typeof callback === 'function'); // callback is null when called from cronjob
 
+    callback = callback || NOOP_CALLBACK;
+
     debug('Cleaning up docker volumes');
 
     docker.listContainers(function (error, containers) {