How to check Ant version inside Ant script

Question

My ant script only works with version >=1.8. I want to check the version in the script, so that it displays error if a lesser version installed.

Answer 1

Here's a code snip that may help:

<property name="version.required" value="1.8" />

<target name="version_check">
    <antversion property="version.running" />
    <fail message="FATAL ERROR:  The running Ant version, ${version.running}, is too old.">
        <condition>
            <not>
                <antversion atleast="${version.required}" />
            </not>
        </condition>
    </fail>
</target>

<target name="doit" depends="version_check">
    <echo level="info" message="The running version of ant, ${version.running}, is new enough" />
</target>