build.xml

<project name="Force.com Migration Tool" default="compile" basedir="." xmlns:sf="antlib:com.salesforce">

    <!-- This file should contain a single antlib.location property definition
         which is used in the `taskdef` element below to identify the location
         of the Force.com Migration Tool JAR file. -->
    <property file="build.properties"/>

    <taskdef resource="com/salesforce/antlib.xml" uri="antlib:com.salesforce">
        <classpath>
            <pathelement location="${antlib.location}" />
        </classpath>
    </taskdef>

    <!-- Deploy but do not run tests -->
    <target name="compile">
        <sf:deploy username="${sf.username}" password="${sf.password}" 
                   serverurl="${sf.serverurl}"
                   deployRoot="src"
                   rollbackOnError="true"/>
    </target>

    <!-- Deploy and run local tests -->
    <target name="deploy">
        <sf:deploy username="${sf.username}" password="${sf.password}" 
                   serverurl="${sf.serverurl}"
                   deployRoot="src"
                   testlevel="RunLocalTests"
                   rollbackOnError="true"/>
    </target>

    <!-- Retrieve an unpackaged set of metadata from your org -->
    <!-- The file src/package.xml lists what is to be retrieved -->
    <target name="retrieve">
        <sf:retrieve username="${sf.username}" password="${sf.password}"
                     serverurl="${sf.serverurl}"
                     retrieveTarget="src"
                     unpackaged="src/package.xml"/>
    </target>

    <!-- Reconcile a package against a target org by deploying the
         local package as-is, and then retrieving the same package
         from the target org. This process would highlight problems
         such as missing field permissions, etc. which would not
         cause deployment to fail but would represent an incomplete
         change to the code base. -->
    <target name="reconcile" depends="deploy,retrieve">
        <exec executable="git">
            <arg value="status"/>
        </exec>
    </target>
</project>