post_install() {
  [ -x /usr/bin/menu-generator-trigger ] && /usr/bin/menu-generator-trigger
}

post_upgrade() {
  [ -x /usr/bin/menu-generator-trigger ] && /usr/bin/menu-generator-trigger
}

post_remove() {
  [ -x /usr/bin/menu-generator-trigger ] && /usr/bin/menu-generator-trigger
}

op=$1
shift
$op $*