#!/bin/sh

set -e

# This script can be called in the following ways:
#
# After the package was installed:
#	<postinst> configure <old-version>
#
#
# If prerm fails during upgrade or fails on failed upgrade:
#	<old-postinst> abort-upgrade <new-version>
#
# If prerm fails during deconfiguration of a package:
#	<postinst> abort-deconfigure in-favour <new-package> <version>
#	           removing <old-package> <version>
#
# If prerm fails during replacement due to conflict:
#	<postinst> abort-remove in-favour <new-package> <version>

case "$1" in
    configure)
        # request a reboot (NM tears down interfaces on restart
        # which is not the way we want to go)
        [ -x /usr/share/update-notifier/notify-reboot-required ] && \
            /usr/share/update-notifier/notify-reboot-required

        update-rc.d -f NetworkManager remove >/dev/null

        if [ -x "/etc/init.d/dbus" ]; then
            invoke-rc.d dbus force-reload || true
        fi

        NIF=/etc/network/interfaces
        if [ -z "$2" ] && [ -f $NIF ]; then
            ifaces=`grep -v '^#' $NIF | awk '/iface/ {print $2}' | sort -u | sed -e 's/lo//' -e '/^$/d' -e 's/^/- /'`
            if [ -n "$ifaces" ]; then
                echo "" 1>&2
                echo "The following network interfaces were found in $NIF" 1>&2
                echo "which means they are currently configured by ifupdown:" 1>&2
                echo "$ifaces" 1>&2
                echo "If you want to manage those interfaces with NetworkManager instead" 1>&2
                echo "remove their configuration from $NIF." 1>&2
                echo "" 1>&2
            fi
        fi

        # Fix up existing /etc/resolv.conf symlinks after the migration to /run
        if dpkg --compare-versions "$2" lt-nl "1.8.0-4"; then
            if [ "$(readlink /etc/resolv.conf)" = /var/run/NetworkManager/resolv.conf ] ; then
                ln -sf  /run/NetworkManager/resolv.conf /etc/resolv.conf
            fi
        fi

	if dpkg --compare-versions "$2" le-nl "9999"; then
		mkdir -p /etc/NetworkManager/conf.d || true
		# for old versions, override the global config with a null config,
		# but only if the netplan config has not been modified by an user.
		if find /etc/netplan -name "*.yaml" | wc -l | grep -qc 0; then
			touch /etc/NetworkManager/conf.d/10-globally-managed-devices.conf
		fi
	fi
        ;;

    abort-upgrade|abort-deconfigure|abort-remove)
        ;;

    *)
        echo "$0 called with unknown argument \`$1'" 1>&2
        exit 1
        ;;
esac

#DEBHELPER#