debian install via own mirror and NFS

[Matthias Ihrke <mittner@nld.ds.mpg.de>]

Hi everyone,

I would like to install debian using an own mirror that I set up on an 
server which exports the mirror as an NFS share to the local network.
I do a tftpboot/pxelinux netboot on the client machine and boot into the 
kernel image provided in the netboot directory 
(/dists/stable/main/installer-amd64/current/images/netboot/).
I only get the possibility to select between http and ftp for access to 
a mirror but I don't have the possibility to use either of them.
I tried also to manually mount the nfs-share containing the mirror via 
the busybox-shell that comes with the installer, but apparently nfs mounts
are not enabled.
NFS-based installation is possible with other linux-distributions
(e.g. openSuSE), so I guess it should be possible with debian as well?
I did a comprehensive web-search but did not find any infos. 

Is there a way to do this?

Cheers,

Matthias