post_install() {
  if [ -x /usr/bin/gdk-pixbuf-query-loaders ]; then
    /usr/bin/gdk-pixbuf-query-loaders > /etc/gtk-2.0/gdk-pixbuf.loaders
  fi
}

post_upgrade() {
  post_install $1
}

post_remove() {
  post_install $1
}

op=$1
shift

$op $*