Check out the new “only_if” support for tasks.
https://github.com/ansible/ansible/blob/master/examples/playbooks/playbook4.yml
Explanation:
http://ansible.github.com/playbooks.html#conditional-execution
Not to brag on the source or anything, but I added this in about 30 minutes. Crazy simple to work on. Needs refactoring to make it simpler, but I’m liking it.
–Michael