func safeWriteContent()

in file.go [184:208]

• 22 lines of code
• 7 McCabe index (conditional complexity)

func safeWriteContent(ctx context.Context, scope Scope, path string, content FileContent, md5Sum string) error {
	tmpFile, err := os.CreateTemp(filepath.Dir(path), filepath.Base(path))
	if err != nil {
		return err
	}
	defer os.Remove(tmpFile.Name())

	checksum := md5.New()
	w := io.MultiWriter(tmpFile, checksum)
	err = content(ctx, scope, w)
	tmpFile.Close()
	if err != nil {
		return err
	}

	if md5Sum != "" && md5Sum != string(checksum.Sum(nil)) {
		return errors.New("md5 checksum of content differs")
	}

	err = os.Remove(path)
	if err != nil && !errors.Is(err, fs.ErrNotExist) {
		return fmt.Errorf("cannot replace file %s", path)
	}
	return os.Rename(tmpFile.Name(), path)
}