====== Include pixz/pxz into bootimage ======
This was tested with Version **20131121-1** of the bootimage from testing. Its possible that this also works on other version. If not please report it to me  --- //[[koch.daniel.89@googlemail.com|dkoch]] 2014/02/06 13:23// \\

The OPSI-Bootimage lacks support for parallel xz compression which was recommended in my environment so i included it. XZ has compressed an image of 10GB to 4,4GB compared to gzip while more or less decompressing it as fast as gzip. I am using this with ntfs-write-image and ntfs-restore-image. 

===== Requirements =====
  * Webserver of choice 
  * pre-execute parameter of bootimage

==== Setup Webserver ====
Get the files needed for pxz and pixz from my webserver

[[http://blackhole.triple6.org/opsi/pixz.tar.gz]]
[[http://blackhole.triple6.org/opsi/pxz.tar.gz]]

and store them in your document root of the Webserver. ( /var/www/ is the default if you are running apache2 for example )
If you don't have a webserver yet install it on your opsi-server by executing these commands ( these include download of required packages and fixing permissions )
<code>
apt-get install apache2 -y
wget -N blackhole.triple6.org/opsi/pixz.tar.gz -O /var/www/pixz.tar.gz
wget -N blackhole.triple6.org/opsi/pxz.tar.gz -O /var/www/pxz.tar.gz
chown www-data:www-data /var/www/ -R
</code>

Create another file named post-boot.sh in your document root as follows:
<code>
#!/bin/bash

wget -N domain-of-the-webserver/pxz.tar.gz
wget -N domain-of-the-webserver/pixz.tar.gz
# If you do not want to setup your own webserver you can insert my public webserver blackhole.triple6.org ( this is not recommended! ) 

tar xaf pxz.tar.gz
tar xaf pixz.tar.gz

cp -a lib/* /lib/
cp -a usr/* /usr/

exit 0
</code>

This script will download pxz and pixz from //domain-of-the-webserver// and patches the boot image before CLIENT_DATA scripts are executed. 

==== Setup Opsi ====


In order to execute it you have to add this value to your opsiconfd-settings (host-parameters)
<code> opsi-linux-bootimage.append pre-execute=http://domain-of-the-webserver/post-boot.sh</code>