Since the last UDS, I'm trying to make the python-django charm evolve to use Ansible for is various tasks instead of using pure Python scripts.
My previous attempt: lp:~patrick-hetu/charms/precise/python-django/ansible had some problems so I decided to restart from scratch here (work in progress): lp:~patrick-hetu/charms/precise/python-django/ansible_reboot Based on the following observations. Use roles that are not specific to Juju --------------------------------------- If you look at an Ansible role you will probably found a file defaults/main.yml or vars/main.yml. For me it was stunning how close those are to a charm configuration file. So why not grab this opportunity to use the same file (minus the charm name at the top [1]) with both Juju and Ansible and make Juju use the same roles that Ansible community are using by introducing shims in the charm playbook. [1] Using a configuration file without that charm name at the top was working in the past but now doesn't. Maybe this could be re-enable without to much negative impact. Couple the playbook with Juju with a shim ----------------------------------------- To get the playbook to work with an external role we could use a shim file that translate Juju's dynamic configuration and relation data to roles variables. I was thinking using a shim imported in the pre_tasks section of the charm's playbook that runs on all tags. (see: https://github.com/ansible/ansible/issues/3157) The shim would do things like: * Translating Juju variable to role variable * Sanitize variable like: unit_name, relation_name, etc * Ensure backward compatiblity Then using tags to dispatch based on the current relation to the corresponding roles. Build role for re-usability --------------------------- This have the potential to solve the problem of repetition of some high level tasks in other charm. Like adding ppa, fetching source code, adding ssl certificate, configuring backup, etc A little bit like what charmhelper is doing right now. I might not be clear so don't be afraid to ask clarification. I'm looking forward to receive your feedbacks Patrick
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