NetworkManager dispatcher script for wifi toggling

70-wifi-conditional-toggle.sh

#!/bin/sh
# NetworkManager dispatcher script for /etc/NetworkManager/dispatcher.d/
# Turn off wifi only while ethernet has connection. Adapted from manpage.
# mnl@vandal.nu 2023

ethernet_connected() {
  # Check if any ethernet connections are up
  nmcli --terse --fields type,state device | while read -r
  do
    [ "${REPLY}" = ethernet:connected ] && return
  done
}

conditionally_toggle_wifi() {
  if ethernet_connected
  then
    nmcli radio wifi off
  else
    nmcli radio wifi on
  fi
}

case ${NM_DISPATCHER_ACTION} in
  up|down)
    conditionally_toggle_wifi ;;
esac