[openstack-dev] [keystone] [nova] [oslo] [cross-project] Dynamic Policy

Adam Young ayoung at redhat.com
Wed Jun 3 23:38:30 UTC 2015

On 06/03/2015 02:55 PM, Sean Dague wrote:
> On 06/03/2015 02:44 PM, David Chadwick wrote:
>> In the design that we have been building for a policy administration
>> database, we dont require a single policy in order to unify common
>> concepts such as hierarchical attributes and roles between the different
>> policies of Openstack services. This is because policies and hierarchies
>> are held separately and are linked via a many to many relationship. My
>> understanding of Adam's primary requirement was that a role hierarchy
>> say, should be common across all OpenStack service policies, without
>> this necessarily meaning you have to have one huge policy. And there is
>> no requirement for Keystone to own all the policies. So each service
>> could still own and manage its own policy, whilst having attribute
>> hierarchies in common.
>> Does this help?
>> regards
>> David
> That part makes total sense. What concerned me is there was an
> intermediary step that seemed like it was literally *one file*
> (https://review.openstack.org/134656). That particular step I think is
> unworkable.

How is this for an approach:

1.  Unified policy  file that is just the union of what is in the 
current projects.  Each project will have a clearly marked section.

2.  Split up the main file into sections, one per each project, and put 
those in separate files.  Build system will concatenate them into a 
single file.

3.  Allow each of the projects to replace their section of the file with 
file containing just an URL to the upstream git repo that contains their 
project specific section.  When building the overall unified policy 
file, those projects that have their own section will get it merged in 
from their own repos.

4.  Eventually, the unified policy file will be expected to be built out 
of each of the projects git repos.

I agree with you that we want the projects to manage their own, I just 
think we need a scrub step where we all look at the individual sections 
together with a critical eye first.

> By "common role hierachy" do you mean namespaced roles for services?
> Because if yes, definitely. And I think that's probably the first
> concrete step moving the whole thing forward, which should be doable on
> the existing static json definitions.
> 	-Sean

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