[openstack-dev] [Nova] Requirements.txt and optional requirements

Daniel P. Berrange berrange at redhat.com
Tue Jan 27 16:14:12 UTC 2015

On Tue, Jan 27, 2015 at 07:12:29AM -0800, Sean Dague wrote:
> On 01/27/2015 12:18 AM, Silvan Kaiser wrote:
> > Hello!
> > Do dependencies required only in some contexts belong into requirements.txt?
> > 
> > Yesterday we had a short discussion on #openstack-nova regarding how to
> > handle optional requirements. This was triggered by our quobyte nova
> > driver (https://review.openstack.org/#/c/110722/18), who requires xattr,
> > which we therefore added to requirements.txt (as it is provided by the
> > requirements project).
> > 
> > Points from the discussion:
> > - If we add this we will be adding every requirement for every component
> > ---> this becomes to big.
> > - Remove this requirement, no optional entries in requirements.txt, a
> > 'deployer' has to know what dependencies the components he wants to use have
> > ---> Usually he does not know and installation becomes more issue prone
> > - Other (in between) ideas???
> > 
> > Please note that this has some urgency, the change set referenced above
> > has been in review for months and i'm trying to react asap on comments
> > but the deadline is approaching (next week) and if i have to do bigger
> > changes I'd like to know as fast as possible...
> Typically the answer is no. The libvirt volume driver architecture is
> kind of weird in the fact that it doesn't actually split it's drivers
> out into separate files, so there can be a file level boundry (including
> loading) for these things.

Not immediately relevant, but in the Lxxxx cycle, I'm hoping to finally
split the volume.py up into a subdirectory of files. The nova.conf
'volume_drivers' config will be removed by thenm, avoiding the back
compat class naming problem we'd have if we split it in Kilo

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