How to find project root dir?

[Suresh Reddy]

Hi All,

      I am debugging a issue with Performance plugin and found that below code is problematic if all builds are getting executed on short-lived slaves (cloud nodes in Azure or AWS) 

        

       this.project.getSomeBuildWithWorkspace().getRootDir()

      Question:

            What is the proper way to get root Dir consider than jobs can be inside folders? I checked online but documentation on this is bit confusing

Thanks,

Suresh Nallamilli.