post_install() {
    echo "update desktop mime database..."
    update-desktop-database
    gtk-update-icon-cache -f /usr/share/icons/hicolor/
}

post_upgrade() {
    gtk-update-icon-cache -f /usr/share/icons/hicolor/
}

post_remove() {
    echo "update desktop mime database..."
    update-desktop-database
    gtk-update-icon-cache -f /usr/share/icons/hicolor/
}