#!/bin/bash

# add ethnet interface sub-block to configure file

shopt -s extglob

if [[ "$*" == *--help* ]] ; then
    echo ${0##*/} [test_]FILE INTERFACE HWID
    exit 0
fi

if [[ "$1" == test_* ]] ; then
    origfile=$1
    bootfile=/tmp/${1##*/}_$$
    cp $origfile $bootfile
    trap "diff -c $origfile $bootfile; rm -f $bootfile; exit 0" $?
else
    origfile=
    bootfile=$1
fi
eth=$2
hwid=$3

sed -i '/^interfaces {$/,/^}$/ {
	/^}$/i\
    ethernet '"$eth"' {\
        hw-id: '"$hwid"'\
        link-detect\
    }
	}' $bootfile