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Excerpts from Douglas Mendizábal's message of 2016-04-13 10:01:21 -0700:
> Hash: SHA512
> 
> Hi Reza,
> 
> The Barbican team has already abstracted python-barbicanclient into a
> general purpose key-storage library called Castellan [1]
> 
> There are a few OpenStack projects that have planned to integrate or
> are currently integrating with Castellan to avoid a hard dependency on
> Barbican.
> 
> There are some tradeoffs to choosing Castellan over
> python-barbicanclient and Castellan may not be right for everyone.
> Also, the only complete implementation of Castellan is currently the
> Barbican implementation, so even though integrating with Castellan
> does not result in a direct dependency, there is still work to be done
> to have a working non-barbican solution.

>From an outsider's perspective with no real stake in this debate,
this sounds like a very reasonable way for Magnum to proceed, which
a pre-dependency that they would move their file based approach into
Castellan.