Yum-plugin-priorities

Yum-plugin-priorities

	Skill level: Advanced
	The instructions on this page may require deviations from standard procedures. A good understanding of linux and Koozali SME Server is recommended.

This page is intended to explore the possible use of yum-plugin-priorities in order to help prevent the installation of unwanted rpms from 3rd-party repositories such as dag, dries, etc.

Installation

yum --enablerepo=extras install yum-plugin-priorities

On SME Server 8.x use (untested!)

yum --enablerepo=extras install yum-priorities

Configuration

The installation of yum-plugin-priorities will create /etc/yum/pluginconf.d/priorities.conf with the following settings

[main]
enabled = 1
check_obsoletes = 1

These settings tell yum to pay attention to the 'priority' setting for each repo, and to make sure the 'obsoletes' flag in a low priority repo will not result in the removal of a package from a higher-priority repo.

If you are not running SME Server 7.4, update smeserver-yum

yum update smeserver-yum

modify yum template

cp the original and add the following to the bottom of the fragment

nano -w  /etc/e-smith/templates-custom/etc/yum.smerepos.d/sme-base.repo/20repositories 

      if (exists $props{priority})
       {
           $OUT .= "priority" . '=' . $props{priority} . "\n";
       }

DB values

Use this script to create DB priority values

#!/bin/bash

for REPO in smeaddons smecontribs smedev smeextras smeos smetest smeupdates smeupdates-testing addons base  centosplus contrib extras updates
do
 db yum_repositories setprop $REPO priority 10
 #set to 99 for testing when you want to remove priority
done

signal-event yum-modify

Usage

• If you install any contribs or non-sme packages using any form of --enablerepo=<xxx>, update with the following to make sure you get any available updates for your extra packages

yum update --enablerepo=<xxx> --enablerepo=<xxx2>

• If you get a missing dependency error from yum
  • re-run yum manually using --exclude <pkgname> on the command line, replacing <pkgname> with the package that is preventing your update
  • If you suspect that the blocked update resolves a security issue, you must decide for yourself whether to compromise the original SME Server/CentOS package and force the update of the non-SME Server/CentOS package by running

yum update --enablerepo=<xxx>  --enablerepo=<xxx2> --noplugins <pkgname>

References

bugzilla:4757

Centos Wiki page at http://wiki.centos.org/PackageManagement/Yum/Priorities

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