SUBMARINE-87. Add an apache rat check script for submarine. Contributed by Zhankun Tang.

hadoop-submarine/dev-support/checks/rat.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# 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.
+
+mkdir -p target
+rm target/rat-aggregated.txt
+mvn apache-rat:check
+grep -r --include=rat.txt "\!\?\?\?\?" ./* | tee ./target/rat-aggregated.txt
+if [ "$(cat target/rat-aggregated.txt)" ]; then
+   echo "Failed to pass apache rat check!"
+   exit -1
+fi