Qubes script to make Yubikey OpenPGP smart cards easier to use.

toggle-yubikey.sh

#!/bin/bash

# Based on https://micahflee.com/2016/12/qubes-tip-making-yubikey-openpgp-smart-cards-slightly-more-usable/
# Detach only:
#   ./toggle-yubikey.sh
# (Detach &&) Attach:
#   ./toggle-yubikey.sh {vm-attachment-target}

YUBIKEY=`qvm-usb | grep Yubikey`
if [ -z "$YUBIKEY" ]; then
  echo "No Yubikey present."
  exit 1
fi
echo "Found Yubikey:"
echo "  $YUBIKEY"

# If it's attached, detach it.
USB_DEVICE=`qvm-usb | grep Yubikey | cut -f1`
USB_ATTACHED=`echo $YUBIKEY | grep "(attached"`
if [ $? -eq 0 ]; then
  echo "Detaching."
  qvm-usb -d "$USB_DEVICE"
  if [ -z "$1" ]; then
    exit 0
  fi
  sleep 1
else
  if [ -z "$1" ]; then
    echo "Exiting. (Provide VM attachment target as script argument to attach it there.)"
    exit 1
  fi
fi

echo "Attaching to: $1"
qvm-usb -a $1 "$USB_DEVICE"