Use the user.home property instead of a bash thing. See

spark404 · spark404 · commit 04d93ef0aafc · 2013-01-21T11:56:53.000+01:00
http://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html
diff --git a/server/src/com/cloud/server/ConfigurationServerImpl.java b/server/src/com/cloud/server/ConfigurationServerImpl.java
@@ -553,8 +553,7 @@ public void updateKeyPairs() {
             return;
         }
         String already = _configDao.getValue("ssh.privatekey");
-        String homeDir = null;
-        homeDir = Script.runSimpleBashScript("echo ~" + username);
+        String homeDir = System.getProperty("user.home");
         if (homeDir == null) {
             throw new CloudRuntimeException("Cannot get home directory for account: " + username);
         }

Original file line number	Diff line number	Diff line change
`@@ -553,8 +553,7 @@ public void updateKeyPairs() {`
`553`	`553`	`return;`
`554`	`554`	`}`
`555`	`555`	`String already = _configDao.getValue("ssh.privatekey");`
`556`		`- String homeDir = null;`
`557`		`- homeDir = Script.runSimpleBashScript("echo ~" + username);`
	`556`	`+ String homeDir = System.getProperty("user.home");`
`558`	`557`	`if (homeDir == null) {`
`559`	`558`	`throw new CloudRuntimeException("Cannot get home directory for account: " + username);`
`560`	`559`	`}`