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

  echo "Note:"
  echo "==> Please don't forget to configure your PostgreSQL database for the program."
}

post_remove() {
  echo "Removing tryton system user... "
  userdel tryton && echo "trytond [done]"
}

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