post_install() {
  udevadm control -R
  udevadm trigger
  echo "Add yourself to 'input' group."
  echo "# gpasswd -a <USER> input"
  echo "You may need to log out."
}

post_upgrade() {
  udevadm control -R
  udevadm trigger
  echo "Add yourself to 'input' group."
  echo "# gpasswd -a <USER> input"
  echo "You may need to log out."
}