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In taskflow we've done something like the following.

Its not perfect, but it is what currently works (willing to take suggestions on better).

We have three different requirements files.

1. Required to work in any manner @ https://github.com/openstack/taskflow/blob/master/requirements.txt
2. Optionally required to work (depending on features used) @ https://github.com/openstack/taskflow/blob/master/optional-requirements.txt
3. Test requirements (only for testing) @ https://github.com/openstack/taskflow/blob/master/test-requirements.txt

Most of the reason for the #2 there is for plugins that taskflow can use (but which are not required for all users). Ideally there would be more dynamic way to list requirements of libraries and projects, one that actually changes depends on the features used/desired to be used. In a way u could imagine a function taking in a list of desired features (qpid vs rabbit could be one such feature) and that function would return a list of requirements to work with this feature set. Splitting it up into these separate files is doing something similar (except using static files instead of just a function to determine this). I'm not sure if anything existing (or is planned) for making this situation better in python (it would be nice if there was a way).

-Josh

From: Doug Hellmann <doug.hellmann at dreamhost.com<mailto:doug.hellmann at dreamhost.com>>
Reply-To: "OpenStack Development Mailing List (not for usage questions)" <openstack-dev at lists.openstack.org<mailto:openstack-dev at lists.openstack.org>>
Date: Wednesday, February 12, 2014 at 1:42 PM
To: Ben Nemec <openstack at nemebean.com<mailto:openstack at nemebean.com>>, "OpenStack Development Mailing List (not for usage questions)" <openstack-dev at lists.openstack.org<mailto:openstack-dev at lists.openstack.org>>
Subject: Re: [openstack-dev] [All]Optional dependencies and requirements.txt




On Wed, Feb 12, 2014 at 3:58 PM, Ben Nemec <openstack at nemebean.com<mailto:openstack at nemebean.com>> wrote:
Hi all,

This is an issue that has come up recently in tripleo as we try to support more varied configurations.  Currently qpid-python is not listed in requirements.txt for many of the OpenStack projects, even though they support using Qpid as a messaging broker.  This means that when we install from source in tripleo we have to dynamically add a line to requirements.txt if we want to use Qpid (we pip install -r to handle deps).  There seems to be disagreement over the correct way to handle this, so Joe requested on my proposed Nova change that I raise the issue here.

There's already some discussion on the bug here: https://bugs.launchpad.net/heat/+bug/1225191 as well as a separate Neutron bug here: https://bugs.launchpad.net/neutron/+bug/1225232

If there's a better alternative to "require all the things" I'm certainly interested to hear it.  I expect we're going to hit this more in the future as we add support for other optional backends for services and such.

We could use a separate requirements file for each driver, following a naming convention to let installation tools pick up the right file. For example, oslo.messaging might include amqp-requirements.txt, qpid-requirements.txt, zmq-requirements.txt, etc.

That would complicate the global requirements sync script, but not terribly so.

Thoughts?

Doug



Thanks.

-Ben

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