#!/bin/sh
# @@@ START COPYRIGHT @@@
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
#
# @@@ END COPYRIGHT @@@


SRC=$1
TMPL=$2
BUILDID=$3

if [ -f $SRC ]; then
	# SRC exists - make a copy
	TMP=/tmp/di$$
	sed "s:@@@@:$BUILDID:" $TMPL > $TMP
	cmp $SRC $TMP >& /dev/null
	if [ $? != 0 ]; then
		# new SRC does not match old SRC - overwrite it
		cp -p $TMP $SRC
	fi
	rm -f $TMP
else
	# SRC does not exist - build the SRC
	sed "s:@@@@:$BUILDID:" $TMPL > $SRC
fi
