func()

in commands/helpers/cache_extractor.go [38:81]

• 37 lines of code
• 9 McCabe index (conditional complexity)

func (c *CacheExtractorCommand) download() (bool, error) {
	os.MkdirAll(filepath.Dir(c.File), 0700)

	file, err := ioutil.TempFile(filepath.Dir(c.File), "cache")
	if err != nil {
		return false, err
	}
	defer file.Close()
	defer os.Remove(file.Name())

	resp, err := c.getClient().Get(c.URL)
	if err != nil {
		return true, err
	}
	defer resp.Body.Close()

	if resp.StatusCode == http.StatusNotFound {
		return false, os.ErrNotExist
	} else if resp.StatusCode/100 != 2 {
		// Retry on server errors
		retry := resp.StatusCode/100 == 5
		return retry, fmt.Errorf("Received: %s", resp.Status)
	}

	fi, _ := os.Lstat(c.File)
	date, _ := time.Parse(http.TimeFormat, resp.Header.Get("Last-Modified"))
	if fi != nil && !date.After(fi.ModTime()) {
		logrus.Infoln(filepath.Base(c.File), "is up to date")
		return false, nil
	}

	logrus.Infoln("Downloading", filepath.Base(c.File), "from", url_helpers.CleanURL(c.URL))
	_, err = io.Copy(file, resp.Body)
	if err != nil {
		return true, err
	}
	os.Chtimes(file.Name(), time.Now(), date)

	err = os.Rename(file.Name(), c.File)
	if err != nil {
		return false, err
	}
	return false, nil
}