dom0-qr-scanner

#!/bin/bash

# Configure this script here
# Run qvm-usb list to find your camera and put its description here
# This one is for Purism Librem cameras
DEV_DESCRIPTION='QUANTA_HD_WebCam'
# Which VM should do the scannning
# Keep in mind that the VM will see the invoices you scan!
VM='personal'

function scan_devs() {
	USB_DEV="`qvm-usb list | grep "$DEV_DESCRIPTION"`"
	DEV_ID="`echo $USB_DEV | cut -d ' ' -f 1`"
	ATTACHED="`echo $USB_DEV | awk '{ print $3 }'`"
}

scan_devs
while [ -z "$DEV_ID" ];
do
	zenity --question --title='QR code reader' --text='The camera is not connecteed.' --ok-label='Retry' --cancel-label='Cancel' || exit 1
	scan_devs
done

case "$ATTACHED" in
	"")
		qvm-usb attach "$VM" "$DEV_ID" || exit 1
		DETACH=1
		REATTACH=0
		;;
	"$VM")
		DETACH=0
		REATTACH=0
		;;
	*)
		zenity --question --title='QR code reader' --text='The camera is attached to a different VM.' --ok-label='Reattach' --cancel-label='Cancel' || exit 1
		qvm-usb detach "$ATTACHED" "$DEV_ID" || exit 1
		if qvm-usb attach "$VM" "$DEV_ID";
		then
			DETACH=1
			REATTACH=1
		else
			qvm-usb attach "$ATTACHED" "$DEV_ID"
			exit 1
		fi
		;;
esac

qvm-run -p personal 'qpay -q'

if [ $DETACH -eq 1 ];
then
	qvm-usb detach "$VM" "$DEV_ID" || exit 1
fi

if [ $REATTACH -eq 1 ];
then
	qvm-usb attach "$ATTACHED" "$DEV_ID" || exit 1
fi