#!/bin/sh
set -e

delete_unchanged() {
  if [ -e "$1" ] && echo "$2 $1" | md5sum --check --status; then
    echo "Removing unchanged configuration file $1"
    rm -f "$1"
  fi
}

backup_conffile() {
  if [ -e "$1" ]; then
    echo "Moving configuration file $1 to $1.dpkg-bak"
    mv -f "$1" "$1".dpkg-bak
  fi
}

case "$1" in
  install|upgrade)
    # clean up files we no longer ship
    delete_unchanged "/etc/resolvconf/update.d/pdns" aeacd4ba822e5ad334c1794e8239d9c1
    backup_conffile "/etc/resolvconf/update.d/pdns"
    delete_unchanged "/etc/insserv.d/pdns-server" af60f140f00b9520efbcd3a18052905d
    backup_conffile "/etc/insserv.d/pdns-server"
    delete_unchanged "/etc/default/pdns" ddd96d47c8c1d5898f45e81fae15e7ac
    delete_unchanged "/etc/default/pdns" 99d5d626abd59cc568dadec22403f638
    backup_conffile "/etc/default/pdns"
    delete_unchanged "/etc/init.d/pdns" 06f3b374bccaf3b71638e759f8053bda
    delete_unchanged "/etc/init.d/pdns" 470533b8de800da2f356c04a58f4aa6b
    backup_conffile "/etc/init.d/pdns"
  ;;
esac