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Excerpts from Brant Knudson's message of 2015-09-29 09:45:53 -0500:
> On Tue, Sep 29, 2015 at 9:38 AM, Douglas Mendizábal <
> douglas.mendizabal at rackspace.com> wrote:
> 
> > -----BEGIN PGP SIGNED MESSAGE-----
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> > Hi openstack-dev,
> >
> > I was wondering what the correct way of handling optional dependencies
> > is? I'm specifically talking about libraries that are only required
> > for a specific driver for example, so they're not technically a hard
> > requirement and the project is expected to function without them when
> > using a driver that does not require the lib.
> >
> >
> We've got some in keystone, so for example the packages for ldap won't get
> installed unless it's requested. One of the reasons we chose this one
> specifically is that the python ldap package requires a C library.
> 
> We set up the different extra package groups in setup.cfg [extras]:
> 
> [1]
> http://git.openstack.org/cgit/openstack/keystone/tree/setup.cfg?h=stable/liberty#n24
> 
> See pbr docs: http://docs.openstack.org/developer/pbr/#extra-requirements
> 
> Here's the tox.ini line so that they're all installed for unit tests:
> http://git.openstack.org/cgit/openstack/keystone/tree/tox.ini?h=stable/liberty#n10
> 
> > I read through the README in openstack/requirements [1] but I didn't
> > see anything about it.

Just to complete the picture, requirements listed as "extras" still need
to be included in the global-requirements list so we can synchronize the
versions everyone uses.

Doug

> >
> >
> > Thanks,
> > Douglas Mendizábal
> >
> > [1]
> > https://git.openstack.org/cgit/openstack/requirements/tree/README.rst
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