def scm_dir
      dir, scm = SCM::DIRS.find { |dir,scm| scm == @scm }

      return dir
    end
def scm_dir
      dir, scm = SCM::DIRS.find { |dir,scm| scm == @scm }

      return dir
    end
The control directory used by the SCM.

 @return [String]
   The name of the control directory.