I've migrated a sequence of build steps to the new Pi Pipeline item in Jenkins ver. 2.0-beta-1. What has worked before (as a part of a Execute Shell build step) does not work now, since I cannot access the Workspace. Simplified example:

node {
   stage 'Checkout'
   git url: 'git@github.com:abc/sandbox.git'

   stage 'Stage 1'
   sh 'echo $WORKSPACE'
   
   stage 'Stage 2'
   sh '''#!/bin/sh
   echo hi
   echo $WORKSPACE'''
}

In the inline documentation, I read that variable WORKSPACE is not supported currently. On the other hand, looking on the console, the Pipeline job has a workspace where the Git sources were checked out to, according to my first Pipeline stage.

A workaround could be to have a variable that just holds the current working directory as absolute path, but I do not know the recommended way to get that.