code: def get_tracking_branch(self):
          
          try:
              remote_uri = self.git("rev-parse", "--abbrev-ref",
                                    "--symbolic-full-name", "@{u}")[0]
              return remote_uri.split('/', 1)
          except Exception as e:
              # capitalization of message changed sometime between git 1.8.3
              # and 2.12 - used to be "No upstream", now "no upstream"..
              errmsg = str(e).lower()
              if ("no upstream branch" not in errmsg
                      and "no upstream configured" not in errmsg):
                  raise e
          return (None, None)
docs: Returns (remote, branch) tuple, or None,None if there is no remote.