V Tue, Jun 20, 2023 at 03:31:27PM +0000, Zbigniew Jędrzejewski-Szmek napsal(a):
> On Tue, Jun 13, 2023 at 06:32:45PM +0200, Petr Pisar wrote:
> > I spent some time thinking how to approximate the nice features with current
> > state of RPM, Koji, and DNF and come up with this approach
> > <https://ppisar.fedorapeople.org/postmodular/>.
> 
> Thank you for the detailed proposal that tries to explore all the
> corner cases.  This looks like it should work. It'd be nice to update
> "postgresql demodularization pr" [1] to this scheme to test it on a real
> live package.
> 
> [1] https://src.fedoraproject.org/rpms/postgresql/pull-request/59
> 
I can do it, but:

Current policy requires building Rawhide builds from rawhide branch. (Hence
I assumed that alternative streams will have separarate dist-git
reposirories. Somebody already correctly pointed that dedicated repositories
with obligate reviews would be too bureaucratic.)

My proposal requires metapackages which should have a dedicated component. The
reason is that the metapackage of a default stream needs to be installed in
@build group, i.e. before building the first content package and for building
the content package. (I could cram the metapackage into the same spec file
with postgresql by bootstrapping, but I guess from process point of view
it's uggly.) Also the metapackage needs to be required from fedora-release.

Currently you cannot build my proposal in Koji, because current Koji
configures mock not to pass --allowerasing option to "dnf builddep"
command. And current Mock actually disabled the option for DNF5
<https://github.com/rpm-software-management/mock/pull/1027> because DNF5 did
not support it until very recently.

And finally, I found a misfeature in DNF where "dnf install" intentionally
ignores RPM Provides
<https://github.com/rpm-software-management/dnf5/issues/620>. If DNF
maintainers do not change their mind, my proposal will be buildable after
fixing <https://github.com/rpm-software-management/dnf5/issues/626>, but an
installation with a base, no-stream name won't work. Someone invoking "dnf
install" would always have to use the real package name with a stream
suffix/prefix. (That bug does not affect transitive dependencies.)

And from practical point of view, postgresql is not a good toy package. Most
of the time it fails to build.

-- Petr

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