Enforce ASF copyright header via Checkstyle

project/pom.xml

@@ -998,6 +998,7 @@
             <artifactId>maven-checkstyle-plugin</artifactId>
             <configuration>
               <configLocation>../resources/checkstyle.xml</configLocation>
+              <headerLocation>../resources/copyright_header.txt</headerLocation>
             </configuration>
           </plugin>
         </plugins>
@@ -1025,6 +1026,7 @@
             <configuration>
               <!-- jclouds-resources has the checkstyle config in the classpath -->
               <configLocation>resources/checkstyle.xml</configLocation>
+              <headerLocation>resources/copyright_header.txt</headerLocation>
             </configuration>
           </plugin>
         </plugins>            

resources/checkstyle.xml

@@ -54,6 +54,10 @@
           <property name="tokens" value="ASSIGN, BAND, BAND_ASSIGN, BOR, BOR_ASSIGN, BSR, BSR_ASSIGN, BXOR, BXOR_ASSIGN, COLON, DIV, DIV_ASSIGN, EQUAL, GE, GT, LAND, LE, LITERAL_ASSERT, LITERAL_CATCH, LITERAL_DO, LITERAL_ELSE, LITERAL_FINALLY, LITERAL_FOR, LITERAL_IF, LITERAL_RETURN, LITERAL_SYNCHRONIZED, LITERAL_TRY, LITERAL_WHILE, LOR, LT, MINUS, MINUS_ASSIGN, MOD, MOD_ASSIGN, NOT_EQUAL, PLUS, PLUS_ASSIGN, QUESTION, SL, SL_ASSIGN, SR, SR_ASSIGN, STAR, STAR_ASSIGN, TYPE_EXTENSION_AND" />
         </module>
     </module>
+    <module name="Header">
+        <property name="headerFile" value="${checkstyle.header.file}"/>
+        <property name="fileExtensions" value="java"/>
+    </module>
     <module name="RegexpMultiline">
         <property name="format" value="@author"/>
         <property name="message" value="Do not use Javadoc @author annotation"/>

resources/copyright_header.txt

@@ -0,0 +1,16 @@
+/*
+ * 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.
+ */

resources/pom.xml

@@ -36,7 +36,8 @@
         <targetPath>resources</targetPath>
         <directory>${project.basedir}</directory>
         <includes>
-            <include>checkstyle.xml</include>
+          <include>checkstyle.xml</include>
+          <include>copyright_header.txt</include>
         </includes>
       </resource>
     </resources>