for file in /etc/default/console-setup /etc/default/keyboard; do
    test -f "$file" || continue

    test -n "$XKBMODEL" && sed -i "s/XKBMODEL=.*/XKBMODEL=\"$XKBMODEL\"/" "$file"
    test -n "$XKBLAYOUT" && sed -i "s/XKBLAYOUT=.*/XKBLAYOUT=\"$XKBLAYOUT\"/" "$file"
    test -n "$XKBVARIANT" && sed -i "s/XKBVARIANT=.*/XKBVARIANT=\"$XKBVARIANT\"/" "$file"
    test -n "$XKBOPTIONS" && sed -i "s/XKBOPTIONS=.*/XKBOPTIONS=\"$XKBOPTIONS\"/" "$file"
done
