#!/bin/sh
set -e
image="$1"
-bridge=lxcbr0
+bridge=br0
[ -e "$image" ] || { echo "Usage: $0 <image> [options...]" >&2; exit 1; }
shift
# find a free MAC adddress
i=0
-MAC_PREFIX=52:54:00:12:34:
while [ $i -lt 255 ]; do
MAC=$(printf '52:54:00:12:34:%02x' $i)
arp -ani $bridge | grep -q $MAC || break