Koji build root caching

[Vít Ondruch]

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Dne 14.1.2015 v 16:00 Dennis Gilmore napsal(a):
> On Wed, 14 Jan 2015 14:57:59 +0100
> Miroslav Suchý <msuchy at redhat.com> wrote:
>
> > On 01/13/2015 06:01 PM, Dennis Gilmore wrote:
> >> that all being said. koji doesn't use any caching and will not use
> >> the lvm plugin. we make every buildroot from scratch using a fully
> >> clean environment to help with ensuring reproducability.
>
> > You can cache and still preserve reproducability. What I'm planning
> > for Copr is to do (every week/month) for chroot in fedora-20-x86_64
> > fedora-21_86_64 ... ; do mock --init $chroot
> >   done
> > take snapshot of that. I plan to do that on VM level.
> > And when new task come, I will just restore from that snapshot. And
> > mock will start with already populated cache. So I will have better
> > caching and yet reproducability.
>
> you really can't.  you would need to make a new cache any time one of
> the packages in the minimal buildroot changes.

Actually this is not anytime. newRepo has to be run, which is not run
more then 4 times per hour I'd say. If the new snapshot is prepared as
part of newRepo task, the mock could reuse the snapshot.


Vít

> while it may not be
> intentional you can get differences in setup and behaviour due to
> scriptlets doing different things on update and initial install. to get
> reproducability you would need to start with the same packages set and
> get the same updates. it really is not simple to do nor to track. which
> is why we purposely disable all caching.
>
> Dennis
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