use systemd-nspawn to boot raspbian image

The setup is a bit tricky and some things might have to be changed, but it should basically work.

1. setup the loopback devive using: loosetup -f -P <path_to_img>.img as root and lets assume the output is /dev/loop1.
2. make sure you have the prerequistes:

• qemu-user-static
• binfmt-support

1. run sudo update-binfmts --enable qemu-arm or something similar
2. create a mount point, lets assume mnt in the current directory
3. mount the image mount /dev/loop1p1 mnt
4. try to start a chroot using systemd-nspawn --bind /lib64 --bind /usr/bin/qemu-arm-static -D mnt /bin/bash as root. if it works you can add the boot option and see if that works as well

On issues check the output of file mnt/bin/bash to see if you use the correct qemu

Update

It seems that systemd-nspawn can despite all this not boot some images, the chroot however should work for all.