case "$MODE" in
    commandline)
        add_option "blacklisted-packages" "`eval_gettext "prevent some packages from being installed"`" "advanced" "true"
        ;;

    configure)
        if [ -n "$option_blacklisted_packages_value" ]; then
            BLACKLISTED_PACKAGES=$(echo $option_blacklisted_packages_value | tr ',' ' ')
        fi
        ;;

    before-install)
        if [ -n "$BLACKLISTED_PACKAGES" ]; then
            # Consolidate all spaces, tabs, enters etc
            BLACKLISTED_PACKAGES=$(echo $BLACKLISTED_PACKAGES)            
            mkdir -p "$ROOT/etc/apt/preferences.d"
            cat > "$ROOT/etc/apt/preferences.d/ltsp-blacklisted-packages" <<EOF
Package: $BLACKLISTED_PACKAGES
Pin: origin ""
Pin-Priority: -1
EOF
        fi
        ;;
esac
