build.xml

<project name="selenium-grid" default="launch-node" basedir="." xmlns:if="ant:if" xmlns:unless="ant:unless">

  <property environment="env"/>
  <exec executable="hostname" osfamily="unix" failifexecutionfails="false" outputproperty="env.COMPUTERNAME"/>
  <property name="env.HOSTNAME" value="${env.COMPUTERNAME}"/> <!-- Windows vs. Linux -->

  <property file="${basedir}/${env.HOSTNAME}.properties" />
  <property file="${basedir}/default.properties"/>

  <target name="fetch-dependencies">
    <mkdir dir="lib"/>
    <get src="http://selenium-release.storage.googleapis.com/${selenium.version.major}${selenium.version.suffix}/selenium-server-standalone-${selenium.version.major}.${selenium.version.minor}${selenium.version.suffix}.jar"
         dest="lib"
         usetimestamp="true"
         ignoreerrors="yes"/>

    <available file="lib/selenium-server-standalone-${selenium.version.major}.${selenium.version.minor}${selenium.version.suffix}.jar" property="selenium.present"/>

    <fail unless="selenium.present" message="Unable to locate lib/selenium-server-standalone-${selenium.version.major}.${selenium.version.minor}${selenium.version.suffix}.jar"/>
  </target>

  <target name="geckodriver">
    <condition property="isWindows" value="true">
      <os family="windows" />
    </condition>
    <condition property="geckodriver.platform" value="macos">
      <os family="mac" />
    </condition>
    <condition property="geckodriver.platform" value="win64">
      <isset property="isWindows" />
    </condition>
    <condition property="geckodriver.platform" value="linux64">
      <os family="unix" />
    </condition>
    <condition property="geckodriver.archive" value="tar.gz">
      <not>
        <isset property="isWindows" />
      </not>
    </condition>
    <condition property="geckodriver.archive" value="zip">
      <isset property="isWindows" />
    </condition>
    <property name="geckodriver.filename" value="geckodriver-v${geckodriver.version}-${geckodriver.platform}"/>
    <get src="https://github.com/mozilla/geckodriver/releases/download/v${geckodriver.version}/${geckodriver.filename}.${geckodriver.archive}" dest="lib" usetimestamp="true" ignoreerrors="yes"/>
    <gunzip src="lib/${geckodriver.filename}.${geckodriver.archive}" dest="lib" unless:set="isWindows"/>
    <unzip src="lib/${geckodriver.filename}.${geckodriver.archive}" dest="lib/${geckodriver.filename}" if:set="isWindows"/>
    <untar src="lib/${geckodriver.filename}.tar" dest="lib/${geckodriver.filename}" unless:set="isWindows"/>
    <delete file="lib/${geckodriver.filename}.tar" unless:set="isWindows"/>
    <condition property="geckodriver.binary" value="lib/${geckodriver.filename}/geckodriver">
      <not>
        <isset property="isWindows" />
      </not>
    </condition>
    <condition property="geckodriver.binary" value="lib/${geckodriver.filename}/geckodriver.exe">
      <isset property="isWindows" />
    </condition>
    <chmod file="lib/${geckodriver.filename}/geckodriver" perm="+x" unless:true="isWindows"/>

    <echo>geckodriver.version: ${geckodriver.version}</echo>
    <echo>geckodriver.platform: ${geckodriver.platform}</echo>
    <echo>geckodriver.archive: ${geckodriver.archive}</echo>
    <echo>geckodriver.filename: ${geckodriver.filename}</echo>
    <echo>geckodriver.binary: ${geckodriver.binary}</echo>
  </target>

  <target name="set-config">
    <echo>os.name: ${os.name}</echo>
    <condition property="node.configuration.file" value="mac.json">
      <contains string="${os.name}" substring="mac" casesensitive="false"/>
    </condition>
    <condition property="node.configuration.file" value="winvista.json">
      <os name="Windows Vista"/>
    </condition>
    <condition property="node.configuration.file" value="win7.json">
      <os name="Windows 7"/>
    </condition>
    <property name="node.configuration.file" value="default.json"/>
    <echo>node.configuration.file: ${node.configuration.file}</echo>
  </target>

  <target name="set-hosts">
    <!-- set the production hub host for the production environment -->
    <condition property="hub.host" value="${production.hub.host}">
      <matches pattern="^production$" string="${env}"/>
    </condition>

    <!-- set the staging hub host for the staging environment -->
    <condition property="hub.host" value="${staging.hub.host}">
      <matches pattern="^staging$" string="${env}"/>
    </condition>

    <!-- otherwise set to localhost (unless overridden) -->
    <property name="hub.host" value="localhost"/>

    <!-- if the hub is running on localhost then so must the node be -->
    <condition property="node.host" value="localhost">
      <matches pattern="localhost" string="${hub.host}"/>
    </condition>

    <!-- otherwise set to the hostname -->
    <property name="node.host" value="${env.HOSTNAME}"/>

    <echo>hub.host: ${hub.host}</echo>
    <echo>node.host: ${node.host}</echo>
  </target>

  <path id="selenium.classpath">
    <pathelement path="${basedir}/"/>
    <fileset dir="${basedir}/lib">
      <include name="selenium-server-standalone-${selenium.version.major}.${selenium.version.minor}${selenium.version.suffix}.jar"/>
    </fileset>
    <pathelement path="${java.class.path}/"/>
  </path>

  <!-- debug target to show variables -->
  <target name="debug">
    <echoproperties/>
  </target>

  <target name="launch-hub"
          description="Launch Selenium Hub"
          depends="fetch-dependencies">
    <java classname="${selenium.classname}"
          classpathref="selenium.classpath"
          fork="true"
          failonerror="true">
      <arg value="-role"/>
      <arg value="hub"/>
      <arg value="-hubConfig"/>
      <arg value="hub_configuration.json"/>
    </java>
  </target>

    <target name="launch-hub-debug"
          description="Launch Selenium Hub in debug mode"
          depends="fetch-dependencies">
    <java classname="${selenium.classname}"
          classpathref="selenium.classpath"
          fork="true"
          failonerror="true">
      <arg value="-role"/>
      <arg value="hub"/>
      <arg value="-hubConfig"/>
      <arg value="hub_configuration.json"/>
      <arg value="-debug"/>
      <arg value="-log"/>
      <arg value="hub.log"/>
    </java>
  </target>

  <target name="launch-node"
          description="Launch Selenium Node"
          depends="fetch-dependencies, geckodriver, set-config, set-hosts">
    <java classpathref="selenium.classpath"
          classname="${selenium.classname}"
          fork="true"
          failonerror="true">
      <sysproperty key="http.nonProxyHosts" value="${hub.host}"/>
      <sysproperty key="webdriver.gecko.driver" value="${geckodriver.binary}"/>
      <sysproperty key="webdriver.firefox.marionette" value="false"/>
      <arg value="-role"/>
      <arg value="node"/>
      <arg value="-id"/>
      <arg value="${env.HOSTNAME}"/>
      <arg value="-hub"/>
      <arg value="http://${hub.host}:${hub.port}/grid/register"/>
      <arg value="-host"/>
      <arg value="${node.host}"/>
      <arg value="-nodeConfig"/>
      <arg value="${node.configuration.file}"/>
    </java>
  </target>

  <target name="launch-node-debug"
          description="Launch Selenium Node in debug mode"
          depends="fetch-dependencies, geckodriver, set-config, set-hosts">
    <java classpathref="selenium.classpath"
          classname="${selenium.classname}"
          fork="true"
          failonerror="true">
      <sysproperty key="http.nonProxyHosts" value="${hub.host}"/>
      <sysproperty key="webdriver.gecko.driver" value="${geckodriver.binary}"/>
      <sysproperty key="webdriver.firefox.marionette" value="false"/>
      <arg value="-role"/>
      <arg value="node"/>
      <arg value="-id"/>
      <arg value="${env.HOSTNAME}"/>
      <arg value="-hub"/>
      <arg value="http://${hub.host}:${hub.port}/grid/register"/>
      <arg value="-host"/>
      <arg value="${node.host}"/>
      <arg value="-nodeConfig"/>
      <arg value="${node.configuration.file}"/>
      <arg value="-debug"/>
      <arg value="-log"/>
      <arg value="node.log"/>
    </java>
  </target>
</project>