[server-admins] Updated yum-update-and-wiki-update.sh script

[Jonathan Marsden]

Per Troy's request and a little IRC discussion, here is an enhanced
yum-update-and-wiki-update.sh script that only does the wiki-specific
stuff if it needs to.

Jonathan


#!/bin/bash
# yum-update-and-wiki-update.sh
# Runs yum update, backing up and updating mediawiki if needed.
# Optional parameter is backup directory.
#
# Author: Jonathan Marsden <jmarsden at fastmail.fm>
# Date: 2009-08-21
#

# Global config variables
DEFAULTBACKUPDIR="/usr/local/backup/mediawiki"  # Default location
BACKUPDIR=${1:-"$DEFAULTBACKUPDIR"}
WIKIDIR="/usr/share/mediawiki"
WIKIUPDATER="maintenance/update.php"
MWUPDATE="no"   # Is a mediawiki update pending? Default to no.

# Is a mediawiki update really pending?
grep -sq ^mediawiki <( yum check-update ) && MWUPDATE="yes"

# Backup the wiki if necessary
[ "$MWUPDATE" = "yes" ] && backup-wiki.sh "$BACKUPDIR"

# Run yum update
sudo yum update -y

# Run the PHP script to update the wiki database, if necessary
[ "$MWUPDATE" = "yes" ] && cd "$WIKIDIR" && php $WIKIUPDATER