Script to swap devices when using a virsh VM (useful if you have two sets of keyboards and mice and want to swap between host and vm often)

swapDevices.sh

#!/bin/bash
set -e

virsh='virsh -c qemu:///system'
vm=win10
testdevice=c22d # Mouseman
batchone="$HOME/.config/win10vm/mouseman.xml $HOME/.config/win10vm/g510.xml"
batchonetitle='Mouseman and G510'
batchtwo="$HOME/.config/win10vm/strafe.xml $HOME/.config/win10vm/g502.xml"
batchtwotitle='Strafe and G502'

detachDevices() {
  for i in $@; do
    $virsh detach-device $vm $i
  done
}

attachDevices() {
  for i in $@; do
    $virsh attach-device $vm $i
  done
}

notify(){
  notify-send -t 5000 -i keyboard 'VM Device Swap' "$@"
}

startScript() {
  if $virsh list | grep -q $vm; then
    if $virsh dumpxml $vm | grep -q $testdevice; then
      detachDevices $batchone
      attachDevices $batchtwo
      notify "$batchtwotitle"
    else
      detachDevices $batchtwo
      attachDevices $batchone
      notify "$batchonetitle"
    fi
  fi
}

startScript

The xml files need to look like that

<hostdev mode='subsystem' type='usb' managed='no'>
  <source>
    <vendor id='0x[before the ":"]'/>
    <product id='0x[after the ":"]'/>
  </source>
</hostdev>

The vendor an product ID need to be filled with the USB id, that you can get with lsusb

example:

$ lsusb
Bus 002 Device 004: ID 1b1c:1b15 Corsair Corsair STRAFE Gaming Keyboard
Bus 002 Device 003: ID 1397:0507 BEHRINGER International GmbH UMC202HD 192k

For the Corsair STRAFE Keyboard, the vendor ID would be 1b1c and the product ID 1b15