From dec6345fe6bd612e1cf1590f768733c300771255 Mon Sep 17 00:00:00 2001
From: Rutger Spiertz <rutger@kumina.nl>
Date: Fri, 17 Jan 2014 10:30:57 +0100
Subject: [PATCH] PlayBook: better error message

When a PlayBook has missing arguments the error message now shows which ones are missing.
---
 lib/ansible/playbook/__init__.py | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/lib/ansible/playbook/__init__.py b/lib/ansible/playbook/__init__.py
index dc7991aaf74..a822d3f2717 100644
--- a/lib/ansible/playbook/__init__.py
+++ b/lib/ansible/playbook/__init__.py
@@ -91,8 +91,17 @@ class PlayBook(object):
 
         self.SETUP_CACHE = SETUP_CACHE
 
-        if playbook is None or callbacks is None or runner_callbacks is None or stats is None:
-            raise Exception('missing required arguments')
+        arguments = []
+        if playbook is None:
+            arguments.append('playbook')
+        if callbacks is None:
+            arguments.append('callbacks')
+        if runner_callbacks is None:
+            arguments.append('runner_callbacks')
+        if stats is None:
+            arguments.append('stats')
+        if arguments:
+            raise Exception('PlayBook missing required arguments: %s' % ', '.join(arguments))
 
         if extra_vars is None:
             extra_vars = {}