Re: Fedora 34 Change: Enable spec file preprocessing (System-Wide Change proposal)

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On Sat, 19 Dec 2020 at 20:57, clime <clime@xxxxxxxxxxxxxxxxx> wrote:
>
> On Sat, 19 Dec 2020 at 20:07, Dan Čermák <dan.cermak@xxxxxxxxxxxxxxxxxxx> wrote:
> >
> > clime <clime@xxxxxxxxxxxxxxxxx> writes:
> >
> > > On Thu, 17 Dec 2020 at 22:04, James Szinger <jszinger@xxxxxxxxx> wrote:
> > >>
> > >> On Thu, 17 Dec 2020 14:05:40 -0500
> > >> Ben Cotton <bcotton@xxxxxxxxxx> wrote:
> > >>
> > >> 1. How does this affect users who download, maybe modify, and rebuild
> > >> the SRPM?  Can they continue to use rpmbuid and mock as they have
> > >> been?  Does the SRPM contain the pre-processed or post-processed spec
> > >> file?
> > >
> > > They can use mock if the preprocessing will be enabled for the
> > > respective chroots where it is enabled in Koji/Fedora.
> > > They can't directly use rpmbuild for those packages that contain the
> > > macros. But they can use rpkg/fedpkg to do the work.
> > > Or preprocess spec first and then use rpmbuild. I am aware this is a
> > > negative point of this change.
> >
> > This is a pretty big downside imho, as that means that building Fedora
> > packages that use these new kinds of macros in other build systems will
> > become impossible or at the very least, very, very difficult. There is
> > quite some development going on in OBS (afaik e.g. Igor exported all
> > Fedora Rust rpms to OBS for automated rebuilds) and enabling this
> > preprocessing will make these packages FTBFS in OBS.
> >
>
> It depends on how the srpms are being built and if Fedora DistGit is
> used directly as the source (as Adam has said also). If there is such
> a possible breakage, we can look at fixing it in advance.
>
> The tooling that implements preprocessing has minimal requirements
> (git or git-core, bash, python, libgit2-devel, rpm-devel) so there
> should be a very low barrier for entry for any environment that would
> need it.
>
> > Don't get me wrong, I am not opposed to this proposal per-se. But as far
> > as I recall, many people were pretty upset about modular packages being
> > effectively only buildable in Fedora's infra and nowhere else. And I'd
> > very much like not to repeat this.
> >
> > > While having an option to use rpmbuild directly to build srpm/rpm from
> > > a dist-git repo is nice, I would say that fedpkg or mock are the main
> > > interfaces to do this.
> > > I know this answer won't satisfy everyone.
> >
> > Indeed. I think there *should* be at least a way how to produce a srpm
> > that can be rebuild *without* having access to Koji, mock and fedpkg
> > (ideally by our own infrastructure).
>

Well, also once you produce an srpm, it will be just a generic srpm
that can be rebuilt in any rpm-compatible system.

> Well, that excludes lots of options already :). One can also use
> preproc-rpmspec tool to get a rendered spec file (this is what mock
> uses).
>
> $ preproc-rpmspec pkg.spec.rpkg  # prints rendered spec to stdout,
> pkg.spec.rpkg is a spec template
>
> >
> >
> > Cheers,
> >
> > Dan
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