[openstack-dev] [Nova] Tracking optional requirements

Michael Still mikal at stillhq.com
Mon Jun 22 11:05:11 UTC 2015

Sure, except where the thing isn't in pip... I just learned tonight
that the libosinfo thing in the review at the start of this thread is
a c library and some gobject black magic. I think we want it, but it
will never work as a pip dependancy. So, I think something human
readable is still required?


On Mon, Jun 22, 2015 at 8:45 PM, Sean Dague <sean at dague.net> wrote:
> On 06/22/2015 06:37 AM, Michael Still wrote:
>> Hi,
>> https://review.openstack.org/#/c/149625 made me think about optional
>> requirements for nova. Some hypervisor drivers have requirements that
>> are either only needed for their driver, or are optional to their
>> driver. Examples include the ironic driver depending on the ironic
>> client, and the review above which wants to add an optional dependancy
>> on libosinfo.
>> In general we keep these things out of requirements.txt because we
>> don't want to force everyone in the world to install the ironic client
>> in order to run their non-ironic hypervisor node.
>> What I am pondering is that I think its a horrible user experience to
>> not document these optional dependancies better. I feel like we need
>> some sort of optional-requirements.txt file in the repo which has a
>> (human readable) list of the optional dependancies of each driver and
>> what those dependancies give you if installed.
>> What would people think of such a thing? Is there a better way of
>> expressing this?
> I believe that Robert and other oslo folks are working on a way to do
> this with environment markers some how -
> https://github.com/dstufft/pip/commit/e498d83db191ccd7fe7c1c2e4f9ec201787d1257
> Because you don't really want optional-requirements.txt. You want:
>> pip install nova nova[libvirt] nova[mysql]
> (or something... hand wave on call out)
>         -Sean
> --
> Sean Dague
> http://dague.net
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