add a way for callback to disable itself

The idea is that some plugin would not be called in some
specific case, and the callback should decide by itself.

Having a way to globally disable it is much cleaner than
disabling every method one by one on the plugin side.

My use case is for fedora-infrastructure that cannot be run
from git checkout since it try to connect to the message bus,
but another case would be to bootstrap infrastructure, or to
run the code on a test servers without having all the callback
infrastructure setup.

plugins/callbacks/osx_say.py

@@ -17,19 +17,28 @@
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 
 import subprocess
+import os
 
 FAILED_VOICE="Zarvox"
 REGULAR_VOICE="Trinoids"
 HAPPY_VOICE="Cellos"
 LASER_VOICE="Princess"
+SAY_CMD="/usr/bin/say"
 
 def say(msg, voice):
-    subprocess.call(["/usr/bin/say", msg, "--voice=%s" % (voice)])
+    subprocess.call([SAY_CMD, msg, "--voice=%s" % (voice)])
 
 class CallbackModule(object):
     """
     makes Ansible much more exciting on OS X.
     """
+    def __init__(self):
+        # plugin disable itself if say is not present
+        # ansible will not call any callback if disabled is set to True
+        if not os.path.exists(SAY_CMD):
+            self.disabled = True
+            print "%s does not exist, plugin %s disabled" % \
+                    (SAY_CMD, os.path.basename(__file__))
 
     def on_any(self, *args, **kwargs):
         pass