#!/bin/bash

# this script should be run when instructed to.

if [[ $(id -u) -ne 0 ]]; then
  echo "This script must be executed as root or using sudo."
  exit 99
fi

logfile="/root/omv_preinstall.log"

exec > >(stdbuf -oL tee -a "${logfile}") 2> >(stdbuf -oL tee -a "${logfile}" >&2)

trap 'rc=$?; echo "=== END $(date -Is) rc=$rc ==="; exit $rc' EXIT

export DEBIAN_FRONTEND=noninteractive
export APT_LISTCHANGES_FRONTEND=none
export LANG=C.UTF-8
export LANGUAGE=C
export LC_ALL=C.UTF-8

apt-get --yes --no-install-recommends install jq
apt-get --yes purge --autoremove cloud-init
mac="$(ip -j a show dev eth0 | jq -r .[].address | head -n1)"
if [ -z "${mac}" ]; then
  mac="$(ip -j a show dev end0 | jq -r .[].address | head -n1)"
fi
if [ -n "${mac}" ]; then
  echo "mac - ${mac}"
  echo -e "[Match]\nMACAddress=${mac}\n[Link]\nName=eth0" > /etc/systemd/network/10-persistent-eth0.link
  echo "Please reboot the system now."
fi

exit 0