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/>. The linked approach
> achieves it at the expense of dedicated build targets and an inability to
> introduce completely new modules (as opposite to new streams of existing
> modules) after releasing an installation media.
So the linked approach emulates Modularity with its main issues (in
particular, the risk of dependency version conflicts ("RPM hell") between
packages, due to the mutual exclusiveness of the different versions of a
"stack") by massive abuse of the Conflicts RPM tag (which is frowned upon
for exactly the aforementioned reason) and without an opt-out (because you
want to drop these packages into the main repository rather than the
optional modular one that is now going to be disabled by default for a good
reason). I fail to see the improvement from that proposal.
If you want to build packages with this (selectable mutually exclusive
versions) approach, please keep using the normal Modularity and accept that
users now have to explicitly opt in to those modules. And in particular,
please accept that non-modular packages are not allowed to require one of
those modules (or in particular, a specific version thereof). Attempting to
work around those requirements (designed to protect users from version
conflicts they cannot resolve) is a very bad idea.
If you really need a package to depend on a specific version of a library,
that library version should be packaged as a parallel-installable
compatibility library as per the packaging guidelines.
Kevin Kofler
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