Boot using rootfs as root

[Arvid Krein]

Hello guix,

I im trying to kexec with the installation image as initrd. One hurdle I 
need to now overcome is that, if I understand it correctly, the 
`system-boot` procedure expects the new root to sit on some device that 
gets mounted and switch-root to in the end.

My issue is that if I pass the whole installation image as initrd then 
everything will end up in the deviceless rootfs. This means I do not 
actually need a switch-root. The boot code does however expect one and 
also expects to mount a device.

There are two solutions I can think of. First to change the code of 
`boot-system` to allow running directly on rootfs. The second one is to 
hamfist the rootfs into the requirements for the switch-root, maybe with 
and overlayfs?

While the first one seems nicer I prefer the second one since it seems 
it might be easier. Does anyone have an idea how to do this?


Greetings

Arvid