custom hw_detect script not working due to biosdevname

Hi All,

We have been using cobbler to provision servers for a few weeks now on
hp hardware without any issues.  We just got one dell server and all
of a sudden my networking is screwed up and looks like it is due to
how dell servers behave due to the biosdevname package by default.  On
the dell server my interface is setup as em1 instead of eth0 and this
is what I am doing in one of my cobbler snippets that is now broken
due to me looking explicitly for eth0:

--
$ cat centos66/hw-detect
#set $mac = $getVar('$mac_address_eth0')
#if $mac
#set $mac_prefix = $mac[0:8]
#if $mac_prefix == "00:0c:29" or $mac_prefix == "00:05:69" or
$mac_prefix == "00:50:56"
#set global $machinetype='virtual'
#else
#set global $machinetype='physical'
#end if
#end if
--

This is just a quick way for me to detect if it is a virtual or
physical machine.  How can I test for the existence of em1 instead?
So basically it would check eth0 if that is what is being defined by
the user or em1 if that is what is being added on the "cobbler system
add" command.

I tried just using $getVar("mac_address") but that does not seem to
work.  Any help would be greatly appreciated.

Thanks!

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