Add support to run the Apache Rat plugin

Add gradle generated files to .gitignore

.gitignore

@@ -2,6 +2,10 @@
 # is an input to 'maven-assembly-plugin' that generates source distribution.
 # This is typically in files named 'src.xml' throughout this repository.
 
+# Ignore files generated by the Gradle build process.
+.gradle/
+build/
+
 # Ignore files generated by the Maven build process.
 bin/
 dependency-reduced-pom.xml

build.gradle

@@ -143,6 +143,7 @@ allprojects  {
 
 buildscript {
   repositories {
+    mavenLocal()
     mavenCentral()
     maven {
       url "https://plugins.gradle.org/m2/"
@@ -155,6 +156,7 @@ buildscript {
     classpath "net.ltgt.gradle:gradle-apt-plugin:0.12"
     classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.1"
     classpath "io.spring.gradle:propdeps-plugin:0.0.9.RELEASE"
+    classpath "gradle.plugin.org.nosphere.apache:creadur-rat-gradle:0.3.1"
   }
 }
 
@@ -248,5 +250,83 @@ subprojects {
   }
 }
 
+// Apply one top level rat plugin to perform any required analysis
+apply plugin: "org.nosphere.apache.rat"
+rat {
+  plainOutput = true
+  xmlOutput = false
+  htmlOutput = false
+  failOnError = true
+  excludes = [
+    // Exclude files generated by the Gradle build process
+    "**/.gradle/**",
+    "**/build/**",
+
+    // .gitignore: Ignore files generated by the Maven build process
+    "**/target/**/*",
+    "**/bin/**/*",
+    "**/dependency-reduced-pom.xml",
+
+    // .gitignore: Ignore files generated by the Python build process
+    "**/*.pyc",
+    "**/*.pyo",
+    "**/*.pyd",
+    "**/*.egg-info/**/*",
+    "**/.eggs/**/*",
+    "**/nose-*.egg/**/*",
+    "**/.tox/**/*",
+    "**/build/**/*",
+    "**/dist/**/*",
+    "**/distribute-*/**/*",
+    "**/env/**/*",
+    "sdks/python/**/*.c",
+    "sdks/python/**/*.so",
+    "sdks/python/LICENSE",
+    "sdks/python/NOTICE",
+    "sdks/python/README.md",
+    "sdks/python/apache_beam/portability/api/*pb2*.*",
+
+    // .gitignore: Ignore IntelliJ files.
+    "**/idea/**/*",
+    "**/*.iml",
+    "**/*.ipr",
+    "**/*.iws",
+
+    // .gitignore: Ignore Eclipse files.
+    "**/.classpath",
+    "**/.project",
+    "**/.factorypath",
+    "**/.checkstyle",
+    "**/.fbExcludeFilterFile",
+    "**/.apt_generated/**/*",
+    "**/.settings/**/*",
+
+    // .gitignore: Ignore Visual Studio Code files.
+    "**/.vscode/*/**",
 
+    // .gitignore: Hotspot VM leaves this log in a non-target directory when java crashes
+    "**/hs_err_pid*.log",
 
+    // .gitignore: Ignore files that end with '~', since they
+    //             are most likely auto-save files produced by a text editor.
+    "**/*~",
+
+    // .gitignore: Ignore MacOSX files.
+    "**/.DS_Store/**/*",
+
+    // Ignore files we track but do not distribute
+    ".github/**/*",
+
+    "**/package-list",
+    "**/user.avsc",
+    "**/test/resources/**/*.txt",
+    "**/test/**/.placeholder",
+
+    // Default eclipse excludes neglect subprojects
+
+    // Proto/grpc generated wrappers
+    "**/apache_beam/portability/api/*_pb2*.py",
+    "**/go/pkg/beam/model/**/*.pb.go",
+  ]
+}
+check.dependsOn rat

gradle/wrapper/gradle-wrapper.properties

@@ -1,3 +1,20 @@
+################################################################################
+#  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.
+################################################################################
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME

gradlew

@@ -1,4 +1,22 @@
 #!/usr/bin/env sh
+################################################################################
+#  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.
+################################################################################
+
 
 ##############################################################################
 ##

gradlew.bat

@@ -1,3 +1,21 @@
+@rem ################################################################################
+@rem #  Licensed to the Apache Software Foundation (ASF) under one
+@rem #  or more contributor license agreements.  See the NOTICE file
+@rem #  distributed with this work for additional information
+@rem #  regarding copyright ownership.  The ASF licenses this file
+@rem #  to you under the Apache License, Version 2.0 (the
+@rem #  "License"); you may not use this file except in compliance
+@rem #  with the License.  You may obtain a copy of the License at
+@rem #
+@rem #      http://www.apache.org/licenses/LICENSE-2.0
+@rem #
+@rem #  Unless required by applicable law or agreed to in writing, software
+@rem #  distributed under the License is distributed on an "AS IS" BASIS,
+@rem #  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem #  See the License for the specific language governing permissions and
+@rem # limitations under the License.
+@rem ################################################################################
+
 @if "%DEBUG%" == "" @echo off
 @rem ##########################################################################
 @rem

settings.gradle

@@ -1,3 +1,21 @@
+/*
+ * 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.
+ */
+
 rootProject.name = 'beam-parent'
 include ':beam-sdks-java-build-tools'
 include ':beam-model-parent:beam-model-pipeline'
@@ -143,4 +161,4 @@ project(':beam-runners-parent').projectDir = "$rootDir/runners" as File
 project(':beam-examples-parent:beam-examples-java').projectDir = "$rootDir/examples/java" as File
 project(':beam-examples-parent:beam-examples-java8').projectDir = "$rootDir/examples/java8" as File
 project(':beam-examples-parent').projectDir = "$rootDir/examples" as File
-project(':beam-sdks-java-javadoc').projectDir = "$rootDir/sdks/java/javadoc" as File
+project(':beam-sdks-java-javadoc').projectDir = "$rootDir/sdks/java/javadoc" as File