Remove gcc, gcc-c++ and make from minimal build root

[Dennis Gilmore]

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On Fri, 16 Jan 2015 17:18:17 +0100
Miroslav Suchý <msuchy at redhat.com> wrote:

> On 01/14/2015 04:00 PM, Dennis Gilmore 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.
> 
> That is why mock run 'yum update' on minimal buildroot before
> proceeding further. So if one package in buildroot changes, you will
> just download and install just that one package and all other comes
> from cache.

That invalidates being able to reproduce the build root exactly. as you
would need to know and reproduce the package update. This is something
that has undergone a lot of thought and consideration and there is very
very good reasons things are the way they are. as i showed elsewhere in
this thread most repos are used only once or twice at most on any given
host.

Dennis
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