ant-config.xml

<?xml version="1.0" encoding="UTF-8"?>

<project name="MITApp" default="config">
    <property file="ant.properties" />
    <loadproperties srcFile="project.properties" />
    <loadproperties srcFile="local.properties" />
    <import file="${sdk.dir}/tools/ant/build.xml" />
	
    <available file=".git" type="dir" property="git.present"/>
    <target name="git.revision" description="Store git revision in ${repository.version}" if="git.present">
    
    	<!-- Get Git properties on UNIX machines -->
    	<!-- ################################### -->
    	<!-- ################################### -->
    	<!-- Get git describe on UNIX machines -->
        <exec executable="git" osfamily="unix" outputproperty="git.revision" failifexecutionfails="false" errorproperty="">
            <arg value="describe"/>
        </exec>
        
        <!-- Get git SHA1 on UNIX machines -->
        <exec executable="git" osfamily="unix" outputproperty="git.hash" failifexecutionfails="false" errorproperty="">
            <arg value="log" />
        	<arg value="-1" />
        	<arg value="--pretty=format:%H" />
        </exec>
        
        <!-- Get Git properties on WINDOWS machines -->
    	<!-- ################################### -->
    	<!-- ################################### -->
        <!-- Get Git describe on WINDOWS machines -->
        <exec executable="git.cmd" osfamily="windows" outputproperty="git.revision" failifexecutionfails="false" errorproperty="git.error">
        	<arg value="describe" />
    	</exec>

        <!-- Get Git SHA1 on WINDOWS machines -->
        <exec executable="git.cmd" osfamily="windows" outputproperty="git.hash" failifexecutionfails="false" errorproperty="git.error">
        	<!-- <arg value="log -1 -pretty=format:%H" /> -->
        	<arg value="log" />
        	<arg value="-1" />
        	<arg value="--pretty=format:%H" />
        </exec>
        
        
        
        <!-- Check if git describe has been stored into property git.revision -->
        <condition property="repository.version" value="${git.revision}" else="unknown">
            <and>
                <isset property="git.revision"/>
                <length string="${git.revision}" trim="yes" length="0" when="greater"/>
            </and>
        </condition>
        
        
        <!-- Check if git SHA1 has been stored into property git.hash -->
        <condition property="repository.hash" value="${git.hash}" else="unknown">
            <and>
                <isset property="git.hash" />
                <length string="${git.hash}" trim="yes" length="0" when="greater" />
            </and>
        </condition>


		<echo message="The current git description :: ${repository.version}" />
		<echo message="The most recent git hash :: ${repository.hash}" />
    </target>



	<!-- Write ant properties into Config.java -->
    <target name="config" depends="git.revision" >
        <property name="config-target-path" value="${source.dir}/edu/mit/mitmobile2/about" />
        <!-- Copy file to new target location, replace keys with new values -->
        <copy file="config/Config.java" todir="${config-target-path}" overwrite="true" encoding="utf-8">
            <filterset>
                <filter token="GIT.DESCRIBE" value="${repository.version}" />
            </filterset>
            <filterset>
                <filter token="GIT.HASH" value="${repository.hash}" />
            </filterset>

        </copy>

        <!-- Set new file to read only so it doesn't cause confusion. Will need to uncomment and implement a delete before the copy -->
       <!--  <chmod file="${config-target-path}/Config.java" perm="-w" />
        <attrib file="${config-target-path}/Config.java" readonly="true" /> -->

    </target>
</project>