On Fri, Aug 23, 2019 at 01:56:09PM -0400, Stephen Gallagher wrote: > So, I see the following options for how to handle default streams in RHEL 8 > > Option 1: We disallow assigning default streams at all within EPEL 8. > This will protect us against a future change where RHEL wants to set a > default. Additionally, it means that all EPEL modules are explicitly > opt-in and so we don't ever surprise anyone. > > Option 2: We allow making EPEL streams the default stream if RHEL does > not currently provide a default stream. We set strict policy regarding > what a default stream may contain (such as "must not replace any > package provided by RHEL 8"). If RHEL later decides to set a default > for this stream, the RHEL release engineering must ensure that the > `data.version` value is higher than what EPEL 8 carries. > > I'm somewhat more in favor of Option 1 here, mostly because it > minimizes the chance of conflicts and ensures the opt-in nature of > EPEL. But I'm willing to hear counter-arguments. > I don't like the Option 1. It makes adding modularized packages into a build root impossible. Efectivelly forcing everbody to modularize everything or nothing. That's exactly the deficiency the modularity has in Fedora and does not have in RHEL. The Option 1 makes the modularity in EPEL terrible as in Fedora.
Example: RHEL has two perl streams: perl:5.24 perl:5.26 [d] You can add a non-modular perl-Foo package into EPEL bacause EPEL magically adds perl:5.26 into the build root. If you add a perl-Foo module into EPEL, you won't be able to set a default stream, hence you won't be able to have it in the build root and therefore you won't be able to add a non-modular perl-Bar package that requires a perl-Foo module component into EPEL. The only solution would be either add perl-Bar as a module, or not add perl-Foo as a module. If you go the second path (i.e. no modules), it means you won't be able build none of the packages for the non-default streams (i.e. perl:5.24). That effectively pushes modules into the role of leaf-only dependencies. That's quite awkward situation if you consider that RHEL delivers language runtimes as modules. The proposed EPEL policy would devalute the non-default runtimes. -- Petr
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