code: def run(self):
          
          args = {"remote": self.remote, "branch": self.branch}
          cmdl = "git pull --ff-only {remote:s} {branch:s}".format(**args)
          try:
              check_call(cmdl.split())
          except CalledProcessError:
              raise SystemExit(1)
          log.info("package version is now {:s}".format(version()))
          return
docs: Execute the command.