Re: RHEL 9 and modularity

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On Wed, Jun 24, 2020 at 08:14:39AM -0400, Stephen Gallagher wrote:
> On Wed, Jun 24, 2020 at 3:38 AM Petr Pisar <ppisar@xxxxxxxxxx> wrote:
> >
> > On Wed, Jun 24, 2020 at 06:51:36AM +0000, Zbigniew Jędrzejewski-Szmek wrote:
> > > Yes. Putting the "stream identification" into the package name is the
> > > most natural solution, and has been floated various times.
> >
> > This already happens. But not in Fedora. In RHEL, modular packages have
> > Modularitylabel RPM tag that carries the module name and stream.
> >
> 
> The ModularityLabel RPM tag is also present in Fedora.

Interesting. I checked the first modular package for the first module "dnf
module list" gives in Fedora 33
(ant-0:1.10.5-3.module_f28+4207+d722d224.noarch), and it does not contain the
tag. I did not checked other ones. Thus I wrote that it was not in Fedora.

Now I see that the package was built on Fedora 28 platform. When I check the
latest build in Koji,  ant-1.10.7-2.module_f31+7074+f8e1675d.noarch, the tag
is there.

My apology. Probably the new tag was enabled sometime in between and nobody
cared to rebuild the module after that (although relengs mass-rebuild modules
on branching) and nobody cared to submit to latest build to stable.

> However, it's documented as *not* reliable for reverse lookups. It only
> lists the NSVCA of the build it first occurred in, which may not be what
> you're looking for if the package was unchanged and has been reused for
> subsequent builds. (Though I *think* you can rely on the name and stream
> being the same right now, since we don't yet have cross-module component
> reuse in MBS, but that's coming.)

Exactly. We do not reuse components across modules. I cannot see how reliable
it could be considering every module can have a different build root resulting
into incompatible builds. So the fact that it "is coming" is news for me.

-- Petr

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