#!/bin/sh

set -e

# This script can be called in the following ways:
#
# Before the package is installed:
#	<new-preinst> install
#
# Before removed package is upgraded:
#	<new-preinst> install <old-version>
#
# Before the package is upgraded:
#	<new-preinst> upgrade <old-version>
#
#
# If postrm fails during upgrade or fails on failed upgrade:
#	<old-preinst> abort-upgrade <new-version>

case "$1" in
    install|upgrade)
	# When upgrading from a version that was using an Alias= instead of
	# symlink to mask the LSB initscript, stop NetworkManager before
	# upgrading if we are running systemd and the NetworkManager.service is
	# not enabled. This will ensure that NM can properly be stopped and
	# then started again after the upgrade (See: #734460)
	if dpkg --compare-versions "$2" lt-nl "0.9.8.8-2~"; then
	    if [ -d /run/systemd/system ] && \
	      ! systemctl is-enabled NetworkManager.service > /dev/null 2>&1; then
	        if [ -x "/etc/init.d/network-manager" ]; then
	            invoke-rc.d network-manager stop || exit $?
	        fi
	    fi
	fi
	if dpkg --compare-versions "$2" lt "0.9.8.8-4"; then
	    if [ -L /etc/systemd/system/network-manager.service ]; then
	        rm -f /etc/systemd/system/network-manager.service
	    fi
	fi

	# Upgrade from previous versions
	if dpkg --compare-versions "$2" lt "0.9.7.997-2"; then
	    # Move old pid file to /var/run/NetworkManager so the init script
	    # doesn't get confused
	    if [ -f /var/run/NetworkManager.pid ]; then
	        [ -d /var/run/NetworkManager/ ] || mkdir /var/run/NetworkManager
	        mv -n /var/run/NetworkManager.pid /var/run/NetworkManager/
	    fi
	fi
	;;

    abort-upgrade)
        ;;

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

#DEBHELPER#