Function WriteCacheMarker

internal/cachedir/cachedir.go:30–57

WriteCacheMarker writes the CACHEDIR.TAG marker file in a given directory.

(cacheDir string)

// WriteCacheMarker writes the CACHEDIR.TAG marker file in a given directory.
func WriteCacheMarker(cacheDir string) error {
	if cacheDir == "" {
		return nil
	}

	markerFile := filepath.Join(cacheDir, CacheDirMarkerFile)

	st, err := os.Stat(markerFile)
	if err == nil && st.Size() >= int64(len(cacheDirMarkerContents)) {
		// ok
		return nil
	}

	if err != nil && !os.IsNotExist(err) {
		return errors.Wrap(err, "unexpected cache marker error")
	}

	f, err := os.Create(markerFile) //nolint:gosec
	if err != nil {
		return errors.Wrap(err, "error creating cache marker")
	}

	if _, err := f.WriteString(cacheDirMarkerContents); err != nil {
		return errors.Wrap(err, "unable to write cachedir marker contents")
	}

	return errors.Wrap(f.Close(), "error closing cache marker file")
}