#!/bin/bash

# stolen from networkmanager postinst script

NIF=/etc/network/interfaces
if [ -f $NIF ]; then
    ifaces=$(grep -v '^#' $NIF | awk '/iface/ {print $2}' | sort -u | sed -e 's/lo//' -e 's/can.*//' -e '/^$/d' -e 's/^/ - /')
    if [ -n "$ifaces" ]; then
        echo ""
        echo "The following network interfaces were found in $NIF"
        echo "which means they are currently configured by ifupdown:"
        echo ""
        echo "$ifaces"
        echo ""
        echo "If you want to manage those interfaces with NetworkManager instead"
        echo "remove their configuration from $NIF"
        echo "or use web interface config editor to remove them."
        echo ""
    fi
fi