debian/upstart.preinst

#!/bin/sh -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>


# Prepare to remove a no-longer used conffile
prep_rm_conffile()
{
    CONFFILE="$1"

    if [ -e "$CONFFILE" ]; then
        md5sum="`md5sum \"$CONFFILE\" | sed -e \"s/ .*//\"`"
        old_md5sum="`sed -n -e \"/^Conffiles:/,/^[^ ]/{\\\\' $CONFFILE '{s/ obsolete$//;s/.* //;p}}\" /var/lib/dpkg/status`"
        if [ "$md5sum" != "$old_md5sum" ]; then
            echo "Obsolete conffile $CONFFILE has been modified by you, renaming to .dpkg-bak"
            mv -f "$CONFFILE" "$CONFFILE".dpkg-bak
	else
	    mv -f "$CONFFILE" "$CONFFILE".dpkg-obsolete
	fi
    fi
}


case "$1" in
    install|upgrade)
	# Upgrade from karmic development version
	if dpkg --compare-versions "$2" lt-nl 0.6.3-7; then
	    prep_rm_conffile /etc/init/dbus-reconnect.conf
	fi
	;;

    abort-upgrade)
	;;

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

#DEBHELPER#
exit 0