Don't capture stderr, this will return an error when the runscript command expects null when there is no default route.

spark404 · spark404 · commit 795366019b4d · 2013-10-14T09:58:37.000+02:00
diff --git a/utils/src/com/cloud/utils/net/NetUtils.java b/utils/src/com/cloud/utils/net/NetUtils.java
@@ -199,7 +199,7 @@ public static String getDefaultHostIp() {
 
     public static String getDefaultEthDevice() {
         if (SystemUtils.IS_OS_MAC) {
-            String defDev = Script.runSimpleBashScript("/sbin/route -n get default | grep interface | awk '{print $2}'");
+            String defDev = Script.runSimpleBashScript("/sbin/route -n get default 2> /dev/null | grep interface | awk '{print $2}'");
             return defDev;
         }
         String defaultRoute = Script.runSimpleBashScript("/sbin/route | grep default");

Original file line number	Diff line number	Diff line change
`@@ -199,7 +199,7 @@ public static String getDefaultHostIp() {`
`199`	`199`
`200`	`200`	`public static String getDefaultEthDevice() {`
`201`	`201`	`if (SystemUtils.IS_OS_MAC) {`
`202`		`- String defDev = Script.runSimpleBashScript("/sbin/route -n get default \| grep interface \| awk '{print $2}'");`
	`202`	`+ String defDev = Script.runSimpleBashScript("/sbin/route -n get default 2> /dev/null \| grep interface \| awk '{print $2}'");`
`203`	`203`	`return defDev;`
`204`	`204`	`}`
`205`	`205`	`String defaultRoute = Script.runSimpleBashScript("/sbin/route \| grep default");`