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Excerpts from Jay S. Bryant's message of 2016-01-05 13:55:30 -0600:
> Ben,
> 
> Please see my in-line responses ...
> 
> On 01/04/2016 05:43 PM, Ben Nemec wrote:
> > On 01/04/2016 03:50 PM, Kendall J Nelson wrote:
> >> Hello,
> >>
> >>
> >> In brainstorming ideas for talks at the upcoming summit, I thought about
> >> some of the things I had worked on for Cinder and what could still be
> >> improved. One of the things I have been looking into is the generation
> >> of sample configuration option files. Upon initial research it looks
> >> like none of the main projects are doing it the same way.
> > I'm not sure what you mean.  Nova, Neutron, Keystone, Glance, and Heat
> > (at least) are all using the oslo-config-generator tool for this.  There
> > might be some slight variation in how they call it, but they are using it.
> Yes, we know that they are all using oslo-config-generator but there is 
> not consistency
> in how the information that oslo-config-generator needs to do its job is 
> being created.
> Kendall is looking to better understand what we should be doing and try 
> to bring
> greater consistency between the projects.
> 
> > I only vaguely recall having discussions about this with Cinder, so I'd
> > be interested in a refresher around why Cinder didn't want to do it the
> > same way.  I kind of considered it a solved problem.
> So, the challenge Cinder has is the fact that there are many 
> configuration options with all the
> different drivers.  We had proposed a static cinder/opts.py file with 
> hacking checks to ensure
> that all new options were pulled into the file.  This was considered 
> undesirable.  This lead to
> the current solution where we are working to find all the possible 
> option lists to dynamically
> create the cinder/opts.py file.  Similar to what we used to do with the 
> old config generator.

I proposed, I think, that each driver should have its own entry point,
cinder.foo, cinder.bar, etc. Each entry point refers to a single
function, which can be maintained inside the driver code by the driver
author. Each would then be registered in setup.cfg and listed in the
input file for the config generator. If you also ensure that all of the
options for a given driver are in their own section of the config file,
you'll have a nice neat sample with all of the options. If a deployer or
distributor wants to generate a file that only includes the driver in
use, that's possible by passing different inputs to the config
generator.

> 
> For Nova, having a dynamic solution is less important as they don't have 
> options changing
> as frequently.  It appears that Neutron was less concerned about the 
> potentially dynamic nature
> of options in their drivers.
> 
> > For reference:
> > Nova: https://github.com/openstack/nova/blob/master/tox.ini#L90
> > Neutron: https://github.com/openstack/neutron/blob/master/tox.ini#L198
> > which calls
> > https://github.com/openstack/neutron/blob/master/tools/generate_config_file_samples.sh#L17
> > Keystone: https://github.com/openstack/keystone/blob/master/tox.ini#L148
> > Etc...
> >
> >> I thought it
> >> might be interesting to get a panel together to talk about how it is
> >> done for each project, why it is done that way for each project, and
> >> maybe discuss a more universal approach that could be implemented in
> >> oslo and used by all the projects. Please let me know if you have
> >> knowledge on your project’s method and are interested in being part of a
> >> panel.
> >>
> >>
> >> If you are interested in looking at Cinder’s approach, here is the patch
> >> I implemented to make the generation of the sample config file dynamic:
> >> https://review.openstack.org/#/c/219700/
> >>
> >>
> >> All the Best,
> >>
> >> *Kendall J. Nelson*
> >> Software Engineer &
> >>
> >> Openstack Cinder Contributor
> >> ------------------------------------------------------------------------
> >> *E-mail:*_kjnelson at us.ibm.com_ <mailto:zahill at us.ibm.com>
> >> *Cell Phone:*(952) 215- 4025*
> >> IRC Nickname:*diablo_rojo    
> >> IBM
> >>
> >> 3605 Hwy 52 N
> >> Rochester, MN 55901-1407
> >> United States
> >>
> >>
> >>
> >>
> >>
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> >
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