#!/bin/bash
# Copyright 2006-2007 (C) Kees Cook <kees@ubuntu.com>
# Modified by Siegfried-A. Gevatter <rainct@ubuntu.com>
# Modified by Daniel Hahler <ubuntu@thequod.de>
# License: GPLv2

if [ "$1" ] && ( [ $1 = '-h' ] || [ $1 = '--help' ] )
then
	echo "Usage: $0 [-q]"
	echo
	echo "Run this inside the source directory of a Debian package and it will detect the patch system that it uses."
	echo
	echo "Additionally, it will try to print a list of all those files outside the debian/ directory that have been modified (if any); if you don't want this, use the -q option."
	exit 0
fi

if [[ -d debian ]]; then
	cd . # pass
elif [[ -d ../debian ]]; then
	cd ..
elif [[ -d ../patches ]]; then
	cd ../.. 
else
	echo "Can't find debian/rules."
	exit 1
fi

if [ "$1" != "-q" ]
then
	files=`lsdiff -z ../$(dpkg-parsechangelog | grep ^Source: | sed -e "s/^Source: //")_$(dpkg-parsechangelog | grep ^Version: | sed -e "s/^Version: //").diff.gz 2>/dev/null | grep -v 'debian/'`
	if [ -n "$files" ]
	then
		echo "Following files were modified outside of the debian/ directory:"
		echo "$files"
		echo "--------------------"
		echo
		echo -n "Patch System: "
	fi
fi

for filename in $(echo "debian/rules"; grep ^include debian/rules | fgrep -v '$(' | awk '{print $2}')
do
	fgrep patchsys.mk "$filename" | grep -q -v "^#" && { echo "cdbs"; exit 0; }
	fgrep quilt "$filename" | grep -q -v "^#" && { echo "quilt"; exit 0; }
	fgrep dbs-build.mk "$filename" | grep -q -v "^#" && { echo "dbs"; exit 0; }
	fgrep dpatch "$filename" | grep -q -v "^#" && { echo "dpatch"; exit 0; }
	fgrep '*.diff' "$filename" | grep -q -v "^#" && { echo "diff splash"; exit 0; }
done
[ -d debian/patches ] || { echo "patchless?"; exit 0; }
echo "unknown patch system"