title: Is there a env variables for slave node home in JENKINS?
body: <p>We know there's a environment variable named JENKINS_HOME so we can use it anywhere as $JENKINS_HOME.
  But now when I running projects on slave nodes, I need to use the home directory of jenkins (which named "remote FS root" when defining a slave node) on slave node as a variable.  And I found $JENKINS_HOME always be the home directory of jenkins on master node even I'm running projects on slave node.</p>
  
  <p>Anyone can help?  Thank you!</p>