[openstack-dev] [oslo][neutron] oslo.policy: policy_dirs config option, why deprecated?
doug at doughellmann.com
Tue Jul 7 18:56:35 UTC 2015
Excerpts from Ben Nemec's message of 2015-07-07 11:41:35 -0500:
> On 07/04/2015 12:12 AM, Akihiro Motoki wrote:
> > Hi Oslo and Neutron folks,
> > Why is policy_dirs option deprecated in oslo.policy?
> > In Neutron we have multiple repositories which consist of Neutron services
> > and we would like to maintain policy.json separately.
> > policy_dirs option looks useful for this purpose.
> > == Detail ==
> > Neutron project now consists of several repositories and
> > they are imported when neutron-server runs.
> > There are cases where it makes sense that each repository manages its
> > policy.json
> > and the neutron-server wants to load all related policy.json files.
> > - advanced services have separate repositories and they evolve their API
> > independently
> > - vendor plugins/drivers in separate repositories (can) have
> > vendor-specific extension API.
> > (It is not a good thing from the point of the current API discussion,
> > but we have now.)
> > An easy way is to put all related policy.json into a single directory
> > lile /etc/neutron/policy.d and specify this to policy_dirs option.
> This will still work fine. The reason policy_dirs was deprecated is
> that we didn't see a need to allow arbitrary policy.d locations and
> doing so caused issues in some edge cases, so after the opt is removed
> we will simply look for policy.d in the configuration directory.
> Essentially, today the default would be to look in
> /etc/neutron/policy.d, but you can change that if you want. Once the
> opt is removed, you will _only_ be able to use /etc/neutron/policy.d.
It's more subtle than that. We have 2 variables interacting right
now, config_dirs (managed by oslo.config) and policy_dirs (managed
by oslo.policy). Both represent multiple places to look for
configuration files, but the policy_dirs value must be a subdirectory
So if config_dirs is ['/etc/one', '/etc/two'] and policy_dirs is
['policy.d', 'another.d'] then the valid locations for policy files are
['/etc/one/policy.d', '/etc/two/policy.d', '/etc/one/another.d',
'/etc/two/another.d']. That set of paths is obvious, but the *order* is
also important, and it's not obvious.
If we really need to have multiple policy files, we should add that
support explicitly somehow instead of backing into it by having
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