changing the default base.tgz

[Ralf Mattes]

Hello list,

i'm trying to install our heavily customized Ubuntu
on a bunch of laptops using FAI and the extra fai-
distributions package. I've successfully created a 
customized base.tgz but since it's named after
the disatribution (base-flap.tgz) i doesn't get used
by the installation process. Is there a way to customize
the name of the base image? It _seems_ to be hardcoded
in subroutines-linux, function 'task_extrbase'.

 TIA Ralf Mattes