Re: How to conditionally define a class? (ex. Xorg configuration)

[Tim Cutts]

On 21 Jan 2010, at 4:53 pm, Thomas Lange wrote:
On Thu, 21 Jan 2010 17:34:44 +0100, Peter Bittner <peter.bitt...@thalesgroup.com 
> said:

(Probably the solution to this is simple, I haven't just figured it  
out,
sorry...)

Now the question is: Instead of running apt-get as above, how can I
define the class XORG_ATI dynamically at installation time (if and  
only
if the XORG class is defined!) in order to install the software  
packages
listed in var/lib/fai/config/package_config/XORG_ATI ?

Create a script class/99-radeon:

#! /bin/bash

# skip if class XORG is not defined
grep -q XORG $FAI/class && exit 0

ATI_RADEON_ID=$(lspci | grep VGA | grep ATI | grep Radeon)
[ "$ATI_RADEON_ID" != "" ] && echo XORG_ATI


But the class XORG has to be defined before this script get executed.
Hope this helps.

We do something similar, but more generic.  We have a perl script  
which runs both lspci and dmidecode, parses the output and sets a lot  
of classes depending on what it finds (manufacturer, machine model  
number, fibrechannel controllers, graphics cards, etc etc)

Tim