build.xml for salesforce ant

build.xml

<project name="Salesforce Ant tasks" default="test" basedir="." xmlns:sf="antlib:com.salesforce">

    <property environment="env"/>

    <target name="retrieve">
      <sf:retrieve username="${env.USERNAME}" password="${env.PASSWORD}" serverurl="${env.SERVER_URL}" retrieveTarget="src" unpackaged="src/package.xml" />
    </target>

    <target name="deploy">
      <sf:deploy username="${env.USERNAME}" password="${env.PASSWORD}" serverurl="${env.SERVER_URL}" deployRoot="src"/>
    </target>

    <target name="validate">
      <sf:deploy username="${env.USERNAME}" password="${env.PASSWORD}" serverurl="${env.SERVER_URL}" deployRoot="src" checkOnly="true"/>
    </target>

</project>