rpm 4.12 and weak dependencies

Haïkel hguemar at fedoraproject.org
Wed Oct 8 21:04:46 UTC 2014


2014-10-08 20:31 GMT+02:00 Kevin Fenzi <kevin at scrye.com>:
> Greetings.
>
> This F21 change:
> http://fedoraproject.org//wiki/Changes/RPM-4.12
>
> has brought us 'weak dependencies', namely:
>
> Recommends, Suggests, Supplements and Enhances
>
> Rpm in f21 and rawhide sees these in spec files and builds fine with
> them. createrepo in those branches also exports this into the metadata.
>
> yum however doesn't do anything with that information.
> dnf does (although it's not clear to me what exactly it does do, so
> input from dnf maintainers would be great).
>
> There's 4 packages that are already using these weak deps, but our
> default package manager (yum) doesn't understand them. People
> installing via yum and installing via dnf will see different behavior.
>
> I filed a fesco ticket to ask that we ask maintainers to please not add
> these until we have guidelines and our default package manager supports
> this information:  https://fedorahosted.org/fesco/ticket/1353
>
> FESCo asked me to post here and see what folks think.
>
> Should we just ask folks not to use these for now (honor system).
>
> Should we add a check to redhat-rpm-macros to check packages and fail
> the build if they use these tags (for now).
>
> Should we just not care that people will see different behavior and
> leave it up to maintainers?
>
> Or should we do something else?
>

Since our default package manager does not understand them, it's
harmless to leave it up to the maintainers.
Most importantly, we need to update packaging guidelines to explain
what are the semantic differences between these different tags. But
that's a minor update.

Before dnf gets promoted as the default package manager, it would be
interesting to do some widespread testing.

1. document dnf behavior with weak dependencies and related
configuration options
2. let people experiment and provide feedbacks
3. based on feedbacks either propose guidelines or status quo if that's ok

Regards,
H.

> Additionally, if we decide to not allow them for now, is anyone wanting
> to work on a guidelines draft / document for when to use them? It would
> depend on how dnf treats them I suspect.
>
> Thanks,
>
> kevin
>
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