post_install() {
  echo
  echo "Adding tryton user and group... "
  useradd -r -c "Tryton Server Daemon" -U -s /bin/false tryton

  echo
  echo "Note:"
  echo "- Tryton modules can be installed using pip, e.g. 'pip install trytond-party'."
  echo "- Configure Tryton using the config file /etc/tryton/trytond.conf."
  echo "- See the Tryton documentation at http://doc.tryton.org for more information."
  echo
}

post_remove() {
  echo "Removing tryton user... "
  userdel tryton
}

op=$1
shift
[ "$(type -t "$op")" = "function" ] && $op "$@"