#!/bin/sh

set -e

rm_conffile() {
	CONFFILE="$1"
	
	if [ -e "$CONFFILE" ]; then
		md5sum="`md5sum \"$CONFFILE\" | sed -e \"s/ .*//\"`"
		old_md5sum="`dpkg-query -W -f='${Conffiles}' docbook-xml | grep $CONFFILE | awk '{print $2}'`"
		if [ "$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
	fi
}

# converting a directory to symlinks during package upgrade doesn't work,
# lets remove the junk in here by hand
# bug 143780, problems caused by danging symlinks
if [ "$1" = upgrade ]; then
    rm -r /usr/share/sgml/docbook/dtd/xml/[1-9]* || true
fi

# handle obsolete dbgenent.ent files, that are placed in /etc/sgml/docbook-xml
# fixes bug #426058
# 4.5: obsoletes 3.1.7
if [ "$1" = remove ] || [ "$1" = upgrade ]; then
	if dpkg --compare-versions "$2" lt "4.5"; then
		rm_conffile "/etc/sgml/docbook-xml/3.1.7/dbgenent.ent"
	fi
fi