#!/bin/sh

set -e

prepare_rm_conffile() {
	local CONFFILE="$1"
	local PACKAGE="$2"

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

	local md5sum="$(md5sum $CONFFILE | sed -e 's/ .*//')"
	local old_md5sum="$(dpkg-query -W -f='${Conffiles}' $PACKAGE | \
		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-backup"
	else
		echo "Moving obsolete conffile $CONFFILE out of the way..."
		mv -f "$CONFFILE" "$CONFFILE.dpkg-remove"
	fi
}

# remove the obsolete init script (replaced by an upstart job)
if [ "$1" = install ] || [ "$1" = upgrade ]; then
	if [ -e "/etc/init.d/nfs-common" ] && [ ! -L "/etc/init.d/nfs-common" ]; then
		prepare_rm_conffile /etc/init.d/nfs-common nfs-common
	fi
fi

prepare_rm_conffile /etc/init/rpc_pipefs.conf nfs-common