#!/bin/sh -e

#
# The boot interface has the hardware type (using its ARP type code) 
# appended to the front of the mac address.
# 
# Example:
#  * 01-AA-BB-CC-DD-EE-FF
#

for i in $(cat /proc/cmdline); do
    case $i in
        BOOTIF=*)
            bootif_mac=$(echo ${i#BOOTIF=??-} | tr -s '-' ':')
            for j in /sys/class/net/*; do
                if grep -q ${bootif_mac} ${j}/address; then
                    bootif_name=${j#/sys/class/net/}
                    debconf-set netcfg/choose_interface ${bootif_name}
                    # Not needed for production.
                    echo "set via pxedust: ${bootif_name}" > /var/log/pxedust
                    break
                fi
            done
            break
            ;;
        *)
            ;;
    esac
done