org.eclipse.wtp.releng.webupdatesite/build-home/createMirrorSite.xml

<?xml version="1.0" encoding="UTF-8"?>
<project
    name="update"
    default="update"
    basedir=".">


    <target name="update">
        <echo message="Creating duplicate update site based on what site.xml needs" />

        <java
            taskname="createDuplicateSite"
            fork="true"
            resultProperty="updateResult"
            failonerror="false"
            jvm="${java15-home}/bin/java"
            classname="org.eclipse.equinox.launcher.Main">
            <classpath>
                <fileset dir="${eclipse.home}/plugins">
                    <include name="org.eclipse.equinox.launcher_*.jar" />
                </fileset>
            </classpath>


            <jvmarg value="-DcontinueOnError=true" />
            <arg value="-clean" />
            <arg value="-nosplash" />
            <arg value="-application" />
            <arg value="org.eclipse.update.core.standaloneUpdate" />
            <arg value="-data" />
            <arg value="${basedir}/buildworkspace" />
            <arg value="-debug" />
            <arg value="-consolelog" />
            <arg value="-command" />
            <arg value="mirror" />
            <arg value="-from" />
            <arg value="${from.update.site}" />
            <arg value="-to" />
            <arg value="${to.update.site}" />

        </java>

    </target>
</project>