From a2096bec18b945a19828a2a953d2d06834caf283 Mon Sep 17 00:00:00 2001
From: Girish Ramakrishnan <girish@cloudron.io>
Date: Mon, 18 Apr 2016 12:22:42 -0700
Subject: [PATCH] use options.stdout to pass back result

---
 src/docker.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/docker.js b/src/docker.js
index b73d5e317..74c227aef 100644
--- a/src/docker.js
+++ b/src/docker.js
@@ -409,8 +409,14 @@ function execContainer(containerId, cmd, options, callback) {
     callback = once(callback); // ChildProcess exit may or may not be called after error
 
     var cp = spawn('/usr/bin/docker', [ 'exec', '-i', containerId  ].concat(cmd));
+
     var chunks = [ ];
-    cp.stdout.on('data', function (chunk) { chunks.push(chunk); });
+
+    if (options.stdout) {
+        cp.stdout.pipe(options.stdout);
+    } else {
+        cp.stdout.on('data', function (chunk) { chunks.push(chunk); });
+    }
 
     cp.on('error', callback);
     cp.on('exit', function (code, signal) {