#!/bin/sh
hex2mac() {
	MAC=""
	seq 2 2 12 | while read i
	do
		echo -n ${1} | head -c $i | tail -c 2
		if [ $i != 12 ]
		then
			echo -n ':'
		fi
	done | tr '[:upper:]' '[:lower:]'
}

if [ "${1}" = start ]
then
	prefix=licheervnano
	if [ -e /boot/hostname.prefix ]
	then
		prefix=$(cat /boot/hostname.prefix)
	fi
	old_hostname=$(cat /etc/hostname)
	new_hostname=${prefix}-$(sha512sum /device_key_legacy | head -c 4)

	if [ -e /boot/hostname ]
	then
		new_hostname=$(cat /boot/hostname)
	fi

	if [ "${old_hostname}" != "${new_hostname}" ]
	then
		hostname ${new_hostname}
		echo ${new_hostname} > /etc/hostname
		sed -i -e "s/${old_hostname}/${new_hostname}/g" /etc/hosts
	fi
	echo "hostname: ${new_hostname}"

	if [ -e /boot/eth.mac ]
	then
		new_ethmac=$(cat /boot/ethmac)
	else
		new_ethmac=$(hex2mac 48da356f$(sha512sum /device_key_legacy  | head -c 4))
	fi

	ifconfig eth0 down
	ip link set eth0 address ${new_ethmac}
	ifconfig eth0 up
	echo "ethernet mac address: ${new_ethmac}"
fi