initramfs-tools: setting the hostname obtained with dhcp (Bug 18466)

I'am trying to get the hostname obtained by dhcp correctly set up at
boot time in a breezy/ltsp system.
Domain, hostname aren't passed to the real init (see
http://bugzilla.ubuntu.com/show_bug.cgi?id=18466)

Before the nfs root filesystem is mounted, the ipconfig command is
launched and write all the information it gets in the file
/tmp/net-{$DEVICE}.conf which is immediately included in the script.
Those informations are not used and lost.

To correct this, I export the useful variables so that the rcS scripts
could be aware of them.

file scripts/nfs:
        ipconfig ${DEVICE}
        . /tmp/net-${DEVICE}.conf

        if [ -n ${HOSTNAME} ]; then
                export DHCP_HOSTNAME=${HOSTNAME}
        fi

and in /etc/init.d/ltsp-client-setup:
configure_hostname() {
    if [ -n "$DHCP_HOSTNAME" ]; then
    cat <<EOF > /etc/hostname
$DHCP_HOSTNAME
EOF
    fi
}


Do you think it's the correct way to solve this bug?
-- 
François