From da4562f4951c842da15af6c4fc2d1e4d5c07e835 Mon Sep 17 00:00:00 2001
From: Michael DeHaan <michael.dehaan@gmail.com>
Date: Wed, 25 Jul 2012 20:45:51 -0400
Subject: [PATCH] changes to not clear the setup cache between runs, and also
 decide to run plays with no tasks in them if it looks like they are not
 tagged, because if that is the case, then we may just be gathering facts
 about them.

---
 lib/ansible/playbook/__init__.py | 10 +++-------
 lib/ansible/playbook/play.py     | 13 +++++++++----
 2 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/lib/ansible/playbook/__init__.py b/lib/ansible/playbook/__init__.py
index 796a570ff5..959a3279f1 100644
--- a/lib/ansible/playbook/__init__.py
+++ b/lib/ansible/playbook/__init__.py
@@ -24,6 +24,8 @@ import os
 import collections
 from play import Play
 
+SETUP_CACHE = collections.defaultdict(dict)
+
 class PlayBook(object):
     '''
     runs an ansible playbook, given as a datastructure or YAML filename.  
@@ -75,7 +77,7 @@ class PlayBook(object):
         sudo:             if not specified per play, requests all plays use sudo mode
         """
 
-        self.SETUP_CACHE = collections.defaultdict(dict)
+        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')
@@ -148,7 +150,6 @@ class PlayBook(object):
         # loop through all patterns and run them
         self.callbacks.on_start()
         for play_ds in self.playbook:
-            self.SETUP_CACHE = collections.defaultdict(dict)
             self._run_play(Play(self,play_ds))
 
         # summarize the results
@@ -219,11 +220,6 @@ class PlayBook(object):
         if results is None:
             results = {}
 
-        # add facts to the global setup cache
-        for host, result in results['contacted'].iteritems():
-            facts = result.get('ansible_facts', {})
-            self.SETUP_CACHE[host].update(facts)
-
         self.stats.compute(results)
  
         # flag which notify handlers need to be run
diff --git a/lib/ansible/playbook/play.py b/lib/ansible/playbook/play.py
index 39ca7ed58e..a6fe723e2f 100644
--- a/lib/ansible/playbook/play.py
+++ b/lib/ansible/playbook/play.py
@@ -178,14 +178,19 @@ class Play(object):
     def should_run(self, tags):
         ''' does the play match any of the tags? '''
 
-        if len(self._tasks) == 0:
-            return False
-
+        tags_counted = 0
         for task in self._tasks:
             for task_tag in task.tags:
+                tags_counted = tags_counted + 1
                 if task_tag in tags:
                     return True
-        return False                    
+
+        if tags_counted > 0:
+            return False  
+   
+        # didn't tag the play, and the play contains no steps
+        # so assume we just want to gather facts
+        return True                  
 
     # *************************************************