code: func Attach(cdir string, podPID int, appName types.ACName, stage1Path string, uuid string, args []string) error {
  	ce := CrossingEntrypoint{
  		PodPath:        cdir,
  		PodPID:         podPID,
  		AppName:        appName.String(),
  		EntrypointName: attachEntrypoint,
  		EntrypointArgs: args,
  		Interactive:    true,
  	}
  
  	if err := ce.Run(); err != nil {
  		return err
  	}
  
  	return nil
  }
docs: // Attach runs attach entrypoint, crossing the stage0/stage1 border.