post_install() {
  echo "update mime database..."
  update-mime-database /usr/share/mime/ > /dev/null
  echo "update desktop database..."
  update-desktop-database -q
  echo "update icon resource..."
  xdg-icon-resource forceupdate
}

post_upgrade() {
  post_install $1
}

post_remove() {
  post_install $1
}