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> 
> To that end, I identified a series of small steps to get us there:
> 
> 1) Unify the "fixed_key" oslo_config definitions in Cinder and Nova
> so they are identical (right now their help texts are slightly
> different). This step avoids triggering a DuplicateOptError exception
> in the next step.
> 
> 2) Add a ConfKeyManager implementation to Castellan. This essentially
> involves copying in one of the existing implementations (either Cinder's
> or Nova's).
> 
> 3) Replace Cinder's and Nova's implementations with references to the
> one in Castellan. This can be done in a way that retains compatibility
> with the key_manager "backend" (was "api_class") config options
> currently used by Cinder and Nova. The code in
> cinder/keymgr/conf_key_manager.py and nova/keymgr/conf_key_manager.py
> will collapse down to this:
> 
>   from castellan.key_manager import conf_key_manager
> 
>   class ConfKeyManager(conf_key_manager.ConfKeyManager):
>       pass
> 
> Having a common ConfKeyManager implementation will make it much
> easier to support migrating things to Barbican, and that's an important
> step toward the goal of deprecating the ConfKeyManager entirely.
> 
> Please let me know your thoughts, as I plan to begin proposing patches.
> 
> Regards,
> 
> Alan Bishop

Makes sense to me Alan. Thanks for looking into this.