#!/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

# Default operation reports only the patch system.  Verbose mode can be
# enabled with -v
if [ "$1" = "-h" ] || [ "$1" = "--help" ]
then
	cat <<EOM
Usage: $0 [-v]

Run this inside the source directory of a Debian package and it will detect
the patch system that it uses.

 -v: Print a list of all those files outside the debian/ directory that have
     been modified (if any).
EOM
	exit 0
fi

while [ ! -r debian/rules ];
do
	if [ "$PWD" = "/" ]; then
		echo "Can't find debian/rules."
		exit 1
	fi
	cd ..
done

if [ "$1" = "-v" ]
then
	files=`lsdiff -z ../$(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"