#!/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>


# Remove a no-longer used conffile
rm_conffile()
{
    local PKGNAME="$1"
    local CONFFILE="$2"

    [ -e "$CONFFILE" ] || return 0

    local md5sum="`md5sum \"$CONFFILE\" | sed -e \"s/ .*//\"`"
    local old_md5sum="`dpkg-query -W -f='${Conffiles}' $PKGNAME | \
            sed -n -e \"\\\\' $CONFFILE'{s/ obsolete$//;s/.* //p}\"`"
    if [ "$md5sum" != "$old_md5sum" ]; then
        echo "Obsolete conffile $CONFFILE has been modified by you."
        echo "Saving as $CONFFILE.dpkg-bak ..."
        mv -f "$CONFFILE" "$CONFFILE".dpkg-bak
    else
        echo "Removing obsolete conffile $CONFFILE ..."
        rm -f "$CONFFILE"
    fi
}

# Prepare to move a conffile without triggering a dpkg question
prep_mv_conffile() {
    local PKGNAME="$1"
    local CONFFILE="$2"

    [ -e "$CONFFILE" ] || return 0

    local md5sum="$(md5sum $CONFFILE | sed -e 's/ .*//')"
    local old_md5sum="$(dpkg-query -W -f='${Conffiles}' $PKGNAME | \
            sed -n -e "\' $CONFFILE ' { s/ obsolete$//; s/.* //; p }")"
    if [ "$md5sum" = "$old_md5sum" ]; then
        rm -f "$CONFFILE"
    fi
}

case "$1" in
    install|upgrade)
	# Upgrade from previous versions
	if dpkg --compare-versions "$2" lt "0.7.0~svn3624-1"; then
	    if [ -x "/etc/init.d/network-manager-dispatcher" ]; then
	        invoke-rc.d network-manager-dispatcher stop
	    fi
	    rm_conffile network-manager /etc/init.d/network-manager-dispatcher
	    update-rc.d network-manager-dispatcher remove >/dev/null
	fi
	if dpkg --compare-versions "$2" lt "0.7.0.100-1"; then
	    rm_conffile network-manager /etc/udev/rules.d/77-nm-probe-modem-capabilities.rules
	    # Move old pid file to /var/run, so /var/run/NetworkManager can be removed
	    # cleanly on upgrades and the daemon can be stopped correctly in postinst
	    if [ -f /var/run/NetworkManager/NetworkManager.pid ]; then
	        mv /var/run/NetworkManager/NetworkManager.pid /var/run/
	    fi
	fi
	if dpkg --compare-versions "$2" lt "0.7.999-1"; then
	    rm_conffile network-manager /etc/dbus-1/system.d/nm-system-settings.conf
	fi
	if dpkg --compare-versions "$2" lt "0.8.1-2"; then
	    prep_mv_conffile network-manager /etc/NetworkManager/nm-system-settings.conf
	fi
	;;

    abort-upgrade)
        ;;

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

#DEBHELPER#