#! /bin/sh
#
#
set -e

#
# If:
#  we are upgrading, and the oldversion is < 1.79-6, and
# there is a /etc/rc.boot/nvi but no /etc/init.d/nviboot, and
# if it looks like the files have changed, 
#
# Then:
# copy the old config file to the new location -- dpkg will detect this
# as a user change config file, and complain.
#
# Else:
# don't do anything - the new init.d/nviboot will be installed, and
# the old rc.boot/nvi will be rm'd in the postinst.
#

case $1 in 
    upgrade|install)
	if [ "$2" ] ; then
	    oldver=$2
	    if dpkg --compare-versions "$oldver" lt "1.79-6" ; then
		if [ -f /etc/rc.boot/nvi -a ! -f /etc/init.d/nviboot ] ; then
		    oldsum=`grep /etc/rc.boot/nvi /var/lib/dpkg/status |awk  '{print $2}'`
		    cursum=`md5sum /etc/rc.boot/nvi | awk  '{print $1}'`
		    
		    if [ $oldsum != $cursum ] ; then
			# It appears the file is different. Let
			# dpkg deal with it. 
			(cd /etc/init.d ; ln ../rc.boot/nvi /etc/init.d/nviboot \
			|| cp ../rc.boot/nvi nviboot)
		    fi
		    
		fi
	    fi
	fi
    ;;
esac