为什么不直接使用 svn export 来代替?

Why don't you just use svn export instead?

无论如何，看起来(从这里)以下应该有效:

Anyway, looks like ( from here ) the following should work:

<echo level="info">Remove svn-files...</echo>
<delete includeemptydirs="true" >
    <fileset dir="${checkout.dir}" defaultexcludes="false" >
         <include name="**/.svn/" />
    </fileset>
</delete>