Remove hardcoded /dev/${DEVICE} from libs
No /dev/sda nor /dev/sdb should be hardcoded
./lib/bootstrap.func.sh: BOOT_UUID=$( lsblk /dev/sda2 -o UUID | tail -n 1 )
./lib/bootstrap.func.sh: chroot ${TARGET} grub-install /dev/sda
./lib/filesystem.func.sh: mkfs.ext2 -F /dev/sda2
./lib/filesystem.func.sh: mount /dev/sda2 ${TARGET}/boot
./bootstrap.func.sh: chroot ${TARGET} grub-install /dev/sdb