post_install() {
    update-mime-database usr/share/mime
    gtk-update-icon-cache -q -t -f usr/share/icons/hicolor	     
}

post_upgrade() {
  post_install $1
}

post_remove() {
    update-mime-database usr/share/mime
    gtk-update-icon-cache -q -t -f usr/share/icons/hicolor
}