#! /usr/bin/env bash
set -euo pipefail
IFS=$'\t\n'

set -x
export DEBIAN_FRONTEND=noninteractive
apt-get install --yes --quiet dnsmasq

lxd_bridge="lxdbr0"
lxd_ipv4_addr="$(
  lxc network get "${lxd_bridge}" ipv4.address |
  cut \
    --delimiter='/' \
    --fields=1
)"
# Create dnsmasq configuration from template
echo "
# Tell any system-wide dnsmasq instance to make sure to bind to interfaces
# instead of listening on 0.0.0.0
# WARNING: changes to this file will get lost if lxd is removed.
server=/lxd/${lxd_ipv4_addr}
bind-interfaces
except-interface=${lxd_bridge}
" > /etc/dnsmasq.d/lxd

systemctl restart dnsmasq.service