Allow cowsay to be removed mid playbook run.

lib/ansible/callbacks.py

@@ -204,9 +204,8 @@ def regular_generic_msg(hostname, result, oneline, caption):
         return "%s | %s >> %s\n" % (hostname, caption, utils.jsonify(result))
 
 
-def banner(msg):
+def banner_cowsay(msg):
 
-    if cowsay:
     if msg.find(": [") != -1:
         msg = msg.replace("[","")
         if msg.endswith("]"):
@@ -219,13 +218,24 @@ def banner(msg):
     cmd = subprocess.Popen(runcmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     (out, err) = cmd.communicate()
     return "%s\n" % out
-    else:
+
+def banner_normal(msg):
+
     width = 78 - len(msg)
     if width < 3:
         width = 3
     filler = "*" * width
     return "\n%s %s " % (msg, filler)
 
+def banner(msg):
+    if cowsay:
+        try:
+            return banner_cowsay(msg)
+        except OSError:
+            # somebody cleverly deleted cowsay or something during the PB run.  heh.
+            return banner_normal(msg)
+    return banner_normal(msg)
+
 def command_generic_msg(hostname, result, oneline, caption):
     ''' output the result of a command run '''