Hi

I recently tried firing up 
https://alpha.gnu.org/gnu/guix/guixsd-vm-image-0.15.0.x86_64-linux.xz 
with qemu.

It booted up alright and took me to a login prompt.

I tried gnu/gnu guix/guix but it did not work.

I lookend for instructions here:

https://www.gnu.org/software/guix/manual/html_node/Running-GuixSD-in-a-VM.html

But they were not really what I needed as they did not answer my to 
questions:

 1.   how to log in?
 2.   can I use the image as a basis for contributing to guix? That is:

     1. is it readonly?
     2. if yes how do I connect a .dmg or similar virtual harddisk
        (example qemu commands or link to something helpful)?
     3. ho much space is needed on this .dmg to download the guix-source
        and compile?

Cheers

Swedebugia