gistfile1.txt

#!/usr/bin/env nix-shell
#!nix-shell -i bash -p openssl

interactive() {
    true
}


cd /sys/bus/thunderbolt/devices/
find .
new_authorizations=0
for d in $(find . -name '*-*'); do
    (
        echo "$d"
        cd "$d"
        if [ "$(cat authorized)" -eq 1 ]; then
            echo "$d: already authorized"
            continue
        fi

        if [ "$(sudo cat key)" = "" ]; then
            echo "$d: empty key"
            # nothing seems to remember keys on this dell xps 9380.
            #if interactive; then
            #    echo -n "create key? [y/N]: "
            #    read x
            #    if [ "$x" = "y" ]; then
            #        openssl rand -hex 32 \
            #            | sudo tee ./key > /dev/null
            #        echo "Please update this script with the new key."
            #        echo "(new key is at $(pwd)/key)"
            #    fi
            #fi
        fi

        case "$(sudo cat key)" in
            aaa)
                ;;
            aaa)
                ;;
            *)
                echo "$d: unknown key"

                if interactive; then
                    echo -n "authorize anyway? [y/N]: "
                    read x
                    if [ "$x" = "y" ]; then
                        echo ""
                    else
                        continue
                    fi
                else
                    continue
                fi
        esac

        echo "$d: authorizing"
        echo 1 | sudo tee ./authorized
    )
    new_authorizations=1
done

new_authorizations=0
echo "$new_authorizations"

cd -

if [ "$new_authorizations" -eq 0 ] && interactive; then
    echo "no new authorizations."
    echo -n "unload, reload thunderbolt, and try again? [y/N]: "
    read x
    if [ "$x" = "y" ]; then
        sudo modprobe -r thunderbolt
        sudo modprobe thunderbolt
        "$0"
    fi
fi