title: Tracing authentication method for rsync via Ant script
body: <p>There is an Ant script which is rsync-ing data to a remote server via an exec statement, however I don't see any method for authentication to the remote server.  The script runs as root (OS is Mac OS X), but when I try to SSH to the remote server as Root I get prompted for a password.  How do I track down where/how the authentication is happening?</p>
  
  <pre><code> &lt;exec dir="/usr/bin/" executable="rsync"&gt;
       &lt;arg value="-av" /&gt; 
      &lt;arg value="${bluealphaout}" /&gt;
      &lt;arg value="Remote_Server::Some_Folder/by_name/" /&gt;
      &lt;/exec&gt;
  </code></pre>