[Yum] Yum priorities plugin

[seth vidal]

On Fri, 2010-06-18 at 15:12 -0400, James Antill wrote:
> Stefano Biagiotti <stefano.biagiotti at vola.it> writes:
> 
> > On a PC with Fedora 13 x86_64 I have several active repositories with
> > different priorities.
> >  [fedora]
> >       priority=1
> >  [updates]
> >       priority=1
> >  ...
> >  [adobe-linux-i386]
> >       priority=20
> >
> > When I do:
> >  # LANG=en_US.utf8 yum install libstdc++.so.6
> >  Loaded plugins: presto, priorities, refresh-packagekit
> [...]
> > Yum wants to install AdobeReader_sve because it provides libstdc++.so.6
> > as reported here [1] too.
> >
> > Shouldn't the priorities yum plugin avoid to install AdobeReader_sve,
> > and go with the classic libstdc++ package in the [fedora] or [updates]
> > repository?
> >
> 
>  Priorities only works on package names. So if the adobe
> repo. provided "foo" and fedora provided "foo" then when yum picked
> "foo" it'd get it from fedora, always.
>  The problem you have is that yum thinks "AdobeReader_sve" is a better
> package than "libstdc++" and there's only one place to get that
> package from.
> 
>  If you provide full debug info. "yum -d9 install libstdc++.so.6" we
> can take a look at why it thinks it's better ... but I have an idea,
> and I doubt we can "fix" it.
>  If you can't just "install libstdc++" or Adobe don't fix their
> packages, you could always start an RFE for filtering provides
> (ie. So you could say "don't allow libstdc++* to be provided from the
> adobe repo.) ... but I'm not sure how hard that'll be atm.

I'd say the easiest implementation of the above is to have a plugin hook
into compare_providers.

So plugin authors can skew the results however they want.

-sv