From 03646d48f358369a149e88cbdd800c285afec5bf Mon Sep 17 00:00:00 2001
From: Kevin Carter <kevin.carter@rackspace.com>
Date: Mon, 27 Apr 2015 10:50:46 -0500
Subject: [PATCH] Added check to see if the variable file is empty

The `pw-token-gen.py` script will fail if used against an empty file.
This change adds a None type check and returns an exit error and
messaage if the loaded value is None.

Closes-Bug: 1446338
Change-Id: I83cb9d1ef312f870f555c6de5f42815ba40e895e
---
 scripts/pw-token-gen.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/scripts/pw-token-gen.py b/scripts/pw-token-gen.py
index f5f70c09b0..5deee8e5af 100755
--- a/scripts/pw-token-gen.py
+++ b/scripts/pw-token-gen.py
@@ -157,6 +157,12 @@ def main():
     with open(user_vars_file, 'rb') as f:
         user_vars = yaml.safe_load(f.read())
 
+    if not user_vars:
+        raise SystemExit(
+            'FAIL: The variable file provided [ %s ] is empty.'
+            % user_vars_file
+        )
+
     changed = False
     generator = CredentialGenerator()
     for entry, value in user_vars.iteritems():