post_install() {
  ( [[ -x /usr/bin/update-desktop-database ]] && update-desktop-database -q ) \
    || true
  ( [[ -x /usr/bin/xdg-icon-resource ]] && xdg-icon-resource forceupdate --theme hicolor ) \
    || true
  ( [[ -x /usr/bin/gtk-update-icon-cache ]] && gtk-update-icon-cache -f -q /usr/share/icons/hicolor ) \
    || true
}

post_upgrade() {
  post_install
}

post_remove() {
  post_install
}