src/assembly/source-assembly.xml

<?xml version='1.0' encoding='UTF-8'?>
<!-- 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. -->
<assembly>
  <id>source-release</id>
  <formats>
    <format>zip</format>
    <format>tar.gz</format>
  </formats>
  <fileSets>
    <!-- main project directory structure -->
    <fileSet>
      <directory>.</directory>
      <outputDirectory>/</outputDirectory>
      <useDefaultExcludes>true</useDefaultExcludes>
      <excludes>
        <!-- build output -->
        <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/).*${project.build.directory}.*]
        </exclude>

        <!-- NOTE: Most of the following excludes should not be required 
          if the standard release process is followed. This is because the release 
          plugin checks out project sources into a location like target/checkout, then 
          runs the build from there. The result is a source-release archive that comes 
          from a pretty clean directory structure. HOWEVER, if the release plugin is 
          configured to run extra goals or generate a project website, it's definitely 
          possible that some of these files will be present. So, it's safer to exclude 
          them. -->

        <!-- IDEs -->
        <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/)(.*/)?maven-eclipse\.xml]
        </exclude>
        <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/)(.*/)?\.project]
        </exclude>
        <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/)(.*/)?\.classpath]
        </exclude>
        <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/)(.*/)?[^/]*\.iws]
        </exclude>
        <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/)(.*/)?\.idea(/.*)?]
        </exclude>
        <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/)(.*/)?out(/.*)?]
        </exclude>
        <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/)(.*/)?[^/]*\.ipr]
        </exclude>
        <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/)(.*/)?[^/]*\.iml]
        </exclude>
        <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/)(.*/)?\.settings(/.*)?]
        </exclude>
        <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/)(.*/)?\.externalToolBuilders(/.*)?]
        </exclude>
        <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/)(.*/)?\.deployables(/.*)?]
        </exclude>
        <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/)(.*/)?\.wtpmodules(/.*)?]
        </exclude>


        <!-- scm -->
        <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/)(.*/)?\.gitignore(/.*)?]
        </exclude>

        <exclude>**/.buildpath</exclude>
        <exclude>**/sandbox/**</exclude>
        
        <!-- misc -->
        <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/)(.*/)?cobertura\.ser]
        </exclude>

        <!-- release-plugin temp files -->
        <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/)(.*/)?pom\.xml\.releaseBackup]
        </exclude>
        <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/)(.*/)?release\.properties]
        </exclude>
      </excludes>
    </fileSet>
    <!-- license, readme, etc. calculated at build time -->
    <fileSet>
      <directory>${project.build.directory}/maven-shared-archive-resources/META-INF
      </directory>
      <outputDirectory>/</outputDirectory>
    </fileSet>
  </fileSets>
</assembly>