code: func ReadDockercfgFile(searchPaths []string) (cfg DockerConfig, err error) {
  	if len(searchPaths) == 0 {
  		searchPaths = DefaultDockercfgPaths()
  	}
  
  	for _, configPath := range searchPaths {
  		absDockerConfigFileLocation, err := filepath.Abs(filepath.Join(configPath, configFileName))
  		if err != nil {
  			klog.Errorf("while trying to canonicalize %s: %v", configPath, err)
  			continue
  		}
  		klog.V(4).Infof("looking for .dockercfg at %s", absDockerConfigFileLocation)
  		contents, err := ioutil.ReadFile(absDockerConfigFileLocation)
  		if os.IsNotExist(err) {
  			continue
  		}
  		if err != nil {
  			klog.V(4).Infof("while trying to read %s: %v", absDockerConfigFileLocation, err)
  			continue
  		}
  		cfg, err := readDockerConfigFileFromBytes(contents)
  		if err == nil {
  			klog.V(4).Infof("found .dockercfg at %s", absDockerConfigFileLocation)
  			return cfg, nil
  		}
  	}
  	return nil, fmt.Errorf("couldn't find valid .dockercfg after checking in %v", searchPaths)
  }
docs: // ReadDockercfgFile attempts to read a legacy dockercfg file from the given paths.
  // if searchPaths is empty, the default paths are used.