#!/bin/sh

### BEGIN INIT INFO
# Provides:          net-persistent-mac
# Required-Start:    $local_fs
# Required-Stop:
# Default-Start:     S
# Default-Stop:
# X-Start-Before:    networking
# Short-Description: restore MAC during boot process
### END INIT INFO

set -e

[ -f /etc/default/net-persistent-mac ] && . /etc/default/net-persistent-mac

MAC_DIR="/var/lib/net-persistent-mac"

for if in $INTERFACES; do
	mkdir -p "$MAC_DIR"
	IF_FILE="$MAC_DIR/$if.mac"
	IF_MAC="/sys/class/net/$if/address"

	# Store MAC for reuse
	if [ ! -r "$IF_FILE" ]; then
		if [ -e "$IF_MAC" ]; then
			echo "Storing MAC for $if for future use." > /dev/stderr
			cat "$IF_MAC" > "$IF_FILE"
		else
			echo "Failed to read MAC for $if; skiping device."
		fi
	fi

	if [ -r "$IF_FILE" ]; then
		# Restore MAC setting
		WANTED_MAC=`cat $IF_FILE`
		if [ "$WANTED_MAC" != "`cat $IF_MAC`" ]; then
			echo "Setting MAC of $if to $WANTED_MAC."
			ifconfig $if hw ether "$WANTED_MAC"
		fi
	fi
done