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[diskimage-builder][ironic-python-agent-builder][ci][focal][ironic] ipa-builder CI jobs can't migrate to ubuntu focal nodeset


On Wed, 7 Oct 2020 at 16:11, Riccardo Pittau <elfosardo at gmail.com> wrote:
>
> Hello fellow openstackers!
>
> At the moment it's not possible to migrate the ironic-python-agent-builder src jobs from bionic to focal nodeset because of diskimage-builder limitations.
> We're stuck with ubuntu bionic and we're pinning those jobs to the bionic nodeset for the time being:
> https://review.opendev.org/756291
>
> One of the community goals for victoria is to move the base nodeset of the CI jobs from ubuntu bionic to focal.
> In general, doing this for most of the ironic projects has not been trivial, but still doable, and it has been accomplished almost entirely.
> The biggest challenge comes from the src jobs in ironic-python-agent-builder where, for some of them, we build ironic-python-agent ramdisks using rpm-based distributions (mainly centos) with diskimage-builder on ubuntu bionic.
> This is possible using utilities (e.g. yumdownloader) included in packages still present in the ubuntu repositories, such as yum-utils and rpm.
> Starting from Ubuntu focal, the yum-utils package has been removed from the repositories because of lack of support of Python 2.x and there's no plan to provide such support, at least to my knowledge.
> The alternative provided by dnf is not usable as there's also no plan to compile and provide a package of dnf for deb-based distributions.
> For the reasons mentioned above, currently the ironic project team can't complete the migration of the CI jobs from bionic to focal and there's no ETA on when this can be accomplished.
>
> Considering all the things in the preamble, two possibilities are available:
> - change the mechanics in diskimage-builder; this process would completely change the way DIB builds rpm-based distros; this approach delegates the work almost entirely to the DIB team.
> - instead of migrating to focal, migrate to centos-8 nodeset; that would mean having devstack+ironic working on centos-8, which poses an interesting challenge and would consume no little resources from the ironic team.
>
> Opinions and advice are very welcome!

My first reaction would be to consider the user impact beyond the box
checking of fulfilling a goal. Does this imply Ubuntu users can no
longer build IPA images from Focal? That would be a shame.

In terms of fulfilling the goal, perhaps running DIB in a CentOS
container would help? This of course adds complexity, potential
problems, and doesn't really test what users would do.

>
> Thanks,
>
> Riccardo
>
>