DNF and mock

[Jan Zelený]

-- snip --
> > I have a notion, that after branching of Fedora 22 I will change
> >   /etc/mock/fedora-rawhide-*.cfg
> > to use DNF by default. I.e. everything build for Fedora 23 would use
> > DNF for building.
> 
> This is not really true. Koji write out its own mock configs and will
> not be using dnf for any operations. for anytime soon.  koji hass no
> way to use different tools to install chroots we will continue to use
> yum to install the buildroots for the foreseeable future. so it would
> mean that locally your builds would use dnf but in koji they will use
> yum.

May I ask why? If you use mock that supports the config option Mirek mentioned 
and if you use Fedora 21 where dnf is up-to-date, are there any other 
technical issues that prevent you from switching the tool for some of the 
buildroots?

> > At the outset I thought that we use yum for older targets (epel-7,
> > fedora-22..) indefinitely. Or to be precise until those targets will
> > be EOLed. But that would imply that yum have to be present in Fedora
> > until Fedora 40 [1]. This is very unlikely to happen. More realistic
> > expectation is that yum will disappear around Fedora 27 [2]. Which
> > means that in  Fedora 27 you either will be unable to build packages
> > for epel-7 or you will have to use DNF. This is quite distant future
> > and we will try our best to make this transition as much flawless as
> > possible. I just want to make you aware in advance. Of course if you
> > want to help, you are very welcome.
> 
> 
> we use the same builders in fedora to go all the way back to epel5 and
> we need to ensure things still work.

Again, if the conditions stated above are met, is there any other technical 
blocker that would prevent you from using different tool in different build 
root? Note that we don't propose having different builders. Yum and dnf can 
happily coexists on the same system.

-- snip --

Thanks
Jan