#!/bin/bash
set -e

divert() {
	dfile=$1
	ltarget=$2
	div=$(dpkg-divert --list $dfile)
	distrib=${3:-$dfile.distrib}
	temp=$dfile.tmp
	if [ -z "$div" ]; then
		# This differs from dpkg-divert's --rename because we
		# first make a copy of $dfile (the file being diverted)
		# in $distrib. Then, a symlink to $ltarget is forcibly created
		# from $dfile; this is performed in two stages with an
		# intermediate temporary file as ln -sf is not atomic.
		# dpkg-divert's --rename direct equivalent would be:
		# mv $dfile $distrib -- but we could end up without a symlink
		if [ -e $dfile ]; then
			cp -dp $dfile $distrib
		fi
		ln -sf $ltarget $temp
		mv -f $temp $dfile
		dpkg-divert --package kanotix-plasma-script --divert $distrib --add $dfile
	fi
}

if [ install = "$1" -o upgrade = "$1" ]; then
	# Divert the following files if no diversion exists already
	divert /usr/share/kde4/apps/plasma-desktop/init/00-defaultLayout.js \
		/usr/share/kde-kanotix-settings/share/apps/plasma-desktop/init/00-empty.js
fi