[CentOS] C7: EPEL conflicts with Base and ElRepo?

[Johnny Hughes]

On 06/19/2015 05:29 AM, Marko Vojinovic wrote:
> On Fri, 19 Jun 2015 09:01:43 +0200
> Nicolas Thierry-Mieg <Nicolas.Thierry-Mieg at imag.fr> wrote:
>> You are correct, but what "more info" do you want?
> 
> Well, a list of names of those conflicting packages would be nice to
> have. Or instructions how to ask yum to compile it.
> 
>> You've spelled it
>> out quite well, you have the solution (set the lowest prio == highest
>> value for epel), end of story?
> 
> Unfortunately, it isn't. I was running the machine for some time
> without having the yum-priorities plugin. I (naively) believed that
> EPEL is careful not to create conflicts against base (I have read on
> this very list that it's safe to use). Stuff got installed, updated
> several times over, etc.
> 
> Now after I figured there are in fact conflicts, I need to figure out
> the consistency of the software installed on my machine. How many (and
> which) packages from base have been stepped over by epel on my system?
> How severe are the consequences?
> 
> I need to know how affected my system is, which packages to reinstall
> (now that I've activated priorities), etc. It's a mess that needs to
> be cleaned up.
> 
>> If you want it fixed you should report this to EPEL, not here. But
>> with a large repo like EPEL this is bound to happen again and again
>> as the distrib is a moving target. yum priorities mostly solves it.
> 
> No, I don't really care to have it fixed, yum-priorities can take care
> of that in the future. But I want to fix my server, to make sure that
> all packages from base are still there.
> 
> And I also want to make some noise about it on this list, so that other
> people don't end up with the same problem. It should be stated clearly
> that epel is *not* safe to use without the priorities plugin.

To be perfectly honest, the differences between EPEL and Base+extras can
usually be completely ignored anyway.

While somethings may be in epel and extras .. and the extras versions
might lag, the extras version likely came from EPEL in the first place
and was added as a build requirement for some other package in extras.

This means that if there is a newer version in EPEL later, it is likely
not going to cause a problem if it is installed on CentOS .. and in
reality, we should probably be pulling that newer EPEL package into
extras anyway.

I don't think, if you stay in the elrepo, EPEL, and Base+Extras family
that you are going to be hurt very often using whatever yum finds
without yum-priorities at all.  I would add the NUX repo to those as
well.  If you go outside those 4, maybe yum-priorities become more
important.

I am sure with 8,000 or so total packages, one might find a conflict
that matters .. but I don't know of any that matter right now.  By
matter, I mean that there is an actual issue using the newer package
from the 4 repos, whichever one that is.


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