On Mon, May 28, 2018 at 10:58 AM Petr Šabata <contyk@redhat.com> wrote:

> On Sat, May 26, 2018 at 05:00:43PM +0200, Fabio Valentini wrote:
> > On Sat, May 26, 2018 at 3:44 PM Neal Gompa <ngompa13@gmail.com> wrote:
> >
> > > On Sat, May 26, 2018 at 9:35 AM Fabio Valentini <decathorpe@gmail.com>
> > > wrote:
> >
> > > > Hi all,
> >
> > > > I think I finally found a scenario where building some of my (and
> > > others') packages as modules would be beneficial.
> >
> > > > The situation is:
> >
> > > > - The syncthing package has a lot of golang dependencies.
> > > > - Some of them are too old in fedora, even in fedora rawhide, and
some
> > of
> > > them have not been touched in years.
> > > > - However, some other packages may depend on those older versions,
or
> > the
> > > packagers don't have time to check for compatibility.
> >
> > > > The idea for a solution I came up with:
> >
> > > > - Build syncthing as a module.
> > > > - Add "syncthing" branches to all incompatible dependencies (I
guess I
> > > have to request commit/admin access to do that for packages I don't
own
> > > yet?).
> > > > - Update those branches to use the exact same commit as the vendored
> > > sources in upstream syncthing.
> > > > - Use those modules as dependencies for the syncthing module.
> >
> > > > Is that a valid, feasible use case of modularity?
> >
> >
> > > You can kind of pigeonhole it into that, but I think you might be
better
> > > served by vendoring things you can't use from Fedora packages and
going
> > > from there.
> >
> > > The problem is that you're touching other people's packages and hoping
> > they
> > > don't make those branches go away. And at the end of it, the output
would
> > > be a single package that lives outside of the normal repo metadata and
> > only
> > > modularity-enabled clients would be able to install it.
> >
> > > The excludes most of the package managers that people can use in
Fedora
> > > right now.
> >
> > > It might make sense if you could describe which dist-git commit to
use in
> > > the module definition, regardless of what's actually released in the
main
> > > repos, and it would just build from those until you upgrade it. That
would
> > > avoid the need for branches in all the golang packages you need for
> > > syncthing.
> >
> > I don't think that would be the case.
> > An upstream commit that's newer than anything that has ever been
packaged
> > before for a fedora branch is never available, not even if I could
target
> > other dist-git commits. That's why I thought of modularity.

> I might not be following but:

> * you can link to any git refs -- branches, tags, or commits

Yes, Neal also pointed that out to me - but it doesn't help if the required
dependency has to be newer than anything that has ever been packaged for
fedora, does it?

> * if you branch the dependencies, it's really up to you to maintain
>    those; that also means you can use any versions and patches

> I think modularity could solve your problem provided that you
> are fine with the syncthing module overriding those dependency
> packages when people enable it.
> Neal's comment on support in package managers is valid.
> This will get better over time but the current state of things
> is also something to consider.

> P
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