add_svc_s6(){
    local mnt="$1" names="$2" valid="" rlvl="${3:-default}"
    for svc in $names; do
        if [[ -d $mnt/etc/s6/sv/$svc ]]; then
            msg2 "Setting %s ..." "$svc"
            valid=${valid:-}${valid:+' '}${svc}
        fi
    done
    chroot $mnt s6-rc-bundle -c /etc/s6/rc/compiled add $rlvl $valid

    # rebuild s6-linux-init
    chroot $mnt rm -r /etc/s6/current
    chroot $mnt s6-linux-init-maker -1 -N -f etc/s6/skel -G "/usr/bin/agetty -L -8 tty1 115200" -c /etc/s6/current /etc/s6/current
    chroot $mnt mv /etc/s6/current/bin/init /etc/s6/current/bin/s6-init
    chroot $mnt cp -a /etc/s6/current/bin /usr
}