code: func init() {
  	graphdriver.Register("lcow", InitDriver)
  	// DOCKER_LCOW_NOREEXEC allows for inline processing which makes
  	// debugging issues in the re-exec codepath significantly easier.
  	if os.Getenv("DOCKER_LCOW_NOREEXEC") != "" {
  		logrus.Warnf("LCOW Graphdriver is set to not re-exec. This is intended for debugging purposes only.")
  		noreexec = true
  	} else {
  		reexec.Register("docker-lcow-tar2ext4", tar2ext4Reexec)
  	}
  }
docs: // init registers this driver to the register. It gets initialised by the
  // function passed in the second parameter, implemented in this file.