Modify how to connect to network in GuixSD graphical installer

[Meikel]

Hi folks,

I try to install GuixSD into a kvm-based VM. I use a graphical tool (I 
assume it' s virt-manager) to get started. I follow the GuixSD 
installation with the graphical installer. When it comes to network 
connectivity I get some problems. I' m able to establish internet 
connectivity when I open the console via STRG-ALT-F3 and enter (real 
values are hidden)

  ifconfig eth0 xxx.yyy.zzz.aaa netmask 255.255.255.255
  route add aaa.bbb.ccc.254 dev eth0
  route add default gw aaa.bbb.ccc.254
  # use OVH nameserver which is close to me:
  echo 'nameserver 213.186.33.99' >> /etc/resolv.conf

After those commands now I' m able to successfully run

  ping -c 3 gnu.org

I feel that the graphical installation would be able to complete if it 
could manage to get connected to the network. I don't want to run the 
complete manual shell-based installation because only the step with 
establishing network connectivity fails.

I' m wondering if it' s possible for me to "manipulate" the graphical 
installer and add the commands outlined above? Is the graphical 
installer based on some shell scripts which I can modify?

Mit freundlichen Grüßen,
Salutations distinguées,
A scheener Grüeß,
Bescht Gréiss,
Kind regards,

Meikel