[ -n "$MIRROR" ] && echo "MIRROR=$MIRROR" >> /etc/debootstrap/variables
[ -n "$MIRROR" ] && echo "CHROOTMIRROR=$MIRROR" >> /etc/debootstrap/variables
[ -n "$ROOTPASSWORD" ] && echo "ROOTPASSWORD=$ROOTPASSWORD" >> /etc/debootstrap/variables
[ -n "$MIRROR" ] && echo "MIRROR=$MIRROR" >> /etc/debootstrap/variables
[ -n "$MIRROR" ] && echo "CHROOTMIRROR=$MIRROR" >> /etc/debootstrap/variables
[ -n "$ROOTPASSWORD" ] && echo "ROOTPASSWORD=$ROOTPASSWORD" >> /etc/debootstrap/variables