Using python to parse the json output from Juju.

cluster/juju/return-node-ips.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python
+import json
+import sys
+# This script helps parse out the private IP addreses from the
+# `juju run` command's JSON object, see cluster/juju/util.sh
+
+if len(sys.argv) > 1:
+    # It takes the JSON output as the first argument.
+    nodes = json.loads(sys.argv[1])
+    # There can be multiple nodes to print the Stdout.
+    for num in nodes:
+        print num['Stdout'].rstrip()
+else:
+    exit(1)