maven/build.xml

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<project default="all" basedir="." xmlns:artifact="urn:maven-artifact-ant">

  <target name="initTaskDefs">
  	<xmlproperty file="pom.xml" prefix="pom.xml" />
    <path id="maven-ant-tasks.classpath" path="maven-ant-tasks-2.1-SNAPSHOT.jar"/>
    <typedef resource="org/apache/maven/artifact/ant/antlib.xml" uri="urn:maven-artifact-ant" classpathref="maven-ant-tasks.classpath"/>
  </target>

  <target name="isMavenHomeSet" depends="initTaskDefs">
    <property environment="env"/>
    <condition property="maven.home" value="${env.M2_HOME}">
      <isset property="env.M2_HOME"/>
    </condition>
    <fail unless="maven.home" message="You must set the M2_HOME environment variable or specify a maven.home property to this Ant script"/>
  </target>

  <target name="init" depends="isMavenHomeSet">
    <xmlproperty prefix="pom" file="pom.xml"/>    
    <basename file="${maven.home}" property="maven.home.basename"/>
    <dirname file="${maven.home}" property="maven.home.dirname"/>
    <property name="maven.home.basename.expected" value="apache-maven-${pom.project.version}"/>
  </target>

  <target name="clean-bootstrap" description="cleans up generated bootstrap classes">
    <delete dir="bootstrap"/>
  </target>

  <target name="pull" depends="init" unless="skip.pull">    
    <property name="verbose" value="false"/>
    <property name="bootstrap.repository" value="${basedir}/bootstrap-repository"/>
    <!-- Pull the dependencies that Maven needs to build -->
    <copy file="pom.xml" tofile="dependencies.xml"/>
    <replace file="${basedir}/dependencies.xml" token="&lt;!--start--&gt;" value="&lt;!--"/>
    <replace file="${basedir}/dependencies.xml" token="&lt;!--end--&gt;" value="--&gt;"/>
    <artifact:pom file="${basedir}/dependencies.xml" id="pom"/>                                                                                                     
    <artifact:dependencies pathId="pom.pathid" filesetId="pom.fileset" verbose="${verbose}">
       <!--
       <localRepository path="${bootstrap.repository}"/>
       -->
       <pom refid="pom"/>                                                                                                                                       
    </artifact:dependencies>      
    <delete file="${basedir}/dependencies.xml"/>
    
    <!-- Pull the dependencies for Modello -->
    <artifact:dependencies pathId="modello.pathid" filesetId="modello.fileset" verbose="${verbose}">
       <!--
       <localRepository path="${bootstrap.repository}"/>
       -->
       <dependency groupId="org.codehaus.modello" artifactId="modello-maven-plugin" version="1.0-alpha-17"/>                                                                                                                                      
    </artifact:dependencies>          
  </target>

  <target name="generate-sources" depends="pull" description="generates Java sources from Modello mdo model files">
    <mkdir dir="bootstrap/target"/>
    <mkdir dir="bootstrap/target/generated-sources"/>

    <macrodef name="modello-single-mode">
      <attribute name="file"/>
      <attribute name="mode"/>
      <attribute name="version"/>
      <sequential>
        <java fork="fork" classname="org.codehaus.modello.ModelloCli" failonerror="true">
          <classpath refid="modello.pathid"/>
          <arg file="@{file}"/>
          <arg value="@{mode}"/>
          <arg file="bootstrap/target/generated-sources"/>
          <arg value="@{version}"/>
          <arg value="false"/>
        </java>
      </sequential>
    </macrodef>

    <macrodef name="modello">
      <attribute name="file"/>
      <attribute name="version" default="1.0.0"/>
      <sequential>
        <echo taskname="modello" message="Generating sources for @{file}"/>
        <modello-single-mode file="@{file}" version="@{version}" mode="java"/>
        <modello-single-mode file="@{file}" version="@{version}" mode="xpp3-reader"/>
        <modello-single-mode file="@{file}" version="@{version}" mode="xpp3-writer"/>
      </sequential>
    </macrodef>

    <modello file="maven-model/src/main/mdo/maven.mdo" version="4.0.0"/>
    <modello file="maven-lifecycle/src/main/mdo/maven-lifecycle.mdo"/>
    <modello file="maven-plugin-api/src/main/mdo/lifecycle.mdo"/>
    <modello file="maven-profile/src/main/mdo/profiles.mdo"/>
    <modello file="maven-core/src/main/mdo/settings.mdo"/>
    <modello file="maven-toolchain/src/main/mdo/toolchains.xml"/>
  </target>

  <target name="compile-boot" depends="generate-sources" description="compiles the bootstrap sources">
    <path id="sources">
      <dirset dir=".">
        <include name="bootstrap/target/generated-sources"/>
        <include name="*/src/main/*"/>
        <include name="maven-reporting/maven-reporting-api/src/main/*"/>
        <exclude name="maven-core-it-verifier/**"/>
      </dirset>
    </path>

    <mkdir dir="bootstrap/target/classes"/>
    <javac destdir="bootstrap/target/classes" debug="${debug}">
      <src refid="sources"/>
      <classpath refid="pom.pathid"/>
    </javac>

    <!-- DGF generating a fake pom.properties so Maven thinks it has a version number -->
    <mkdir dir="bootstrap/target/classes/META-INF/maven/org.apache.maven/maven-core"/>
    <echo message="version=${pom.project.version}"
          file="bootstrap/target/classes/META-INF/maven/org.apache.maven/maven-core/pom.properties"/>

    <path id="maven.classpath">
      <pathelement location="bootstrap/target/classes"/>
      <path refid="sources"/>
      <path refid="pom.pathid"/>
    </path>
  </target>

  <target name="maven-compile" depends="compile-boot" description="compiles Maven using the bootstrap Maven, skipping automated tests">
    <java fork="true" classname="org.apache.maven.cli.MavenCli" failonerror="true">
      <classpath refid="maven.classpath"/>
      <arg value="-B"/>
      <arg value="clean"/>
      <arg value="install"/>
    </java>
  </target>

  <target name="maven-assembly" depends="maven-compile" description="generates the Maven installation assembly using the bootstrap Maven">          
    <echo>
    The new Maven distribution was created as part of the MAVEN-COMPILE step, above. 
    This goal just validates the presence of that distribution.
    </echo>
    <property name="maven.assembly" location="maven-distribution/target/${maven.home.basename.expected}-bin.zip"/>
    <condition property="build.failed">
      <not>
        <available file="${maven.assembly}"/>
      </not>
    </condition>
    <fail if="build.failed" message="Assembly task seemed to succeed, but couldn't find assembly file: ${maven.assembly}"/>
  </target>

  <target name="extract-assembly" depends="init,maven-assembly" description="extracts the maven assembly into maven.home">
    <echo>Extracting assembly to ${maven.home.dirname} ...</echo>
    <!-- Deleting the contents inside maven.home allow one to use symlinks for maven.home and still have this work. -->      
    <delete>
      <fileset dir="${maven.home}">
        <include name="bin"/>
        <include name="boot"/>
        <include name="conf"/>
        <include name="lib"/>
        <include name="*.txt"/>
      </fileset>
    </delete>
    <unzip src="${maven.assembly}" dest="${maven.home.dirname}"/>
    <chmod perm="+x">
      <fileset dir="${maven.home}/bin">
        <include name="mvn"/>
        <include name="m2"/>
      </fileset>
    </chmod>
  </target>

  <target name="all" depends="clean-bootstrap,init,extract-assembly"/>

</project>