// OsOpenFile allows overriding default function.
	OsOpenFile = os.OpenFile
)

// ReadFileWithFileInfo reads the named file and returns the contents.
// A successful call returns err == nil, not err == EOF.
// Because ReadFile reads the whole file, it does not treat an EOF from Read
// as an error to be reported.
func ReadFileWithFileInfo(name string) ([]byte, fs.FileInfo, error) {
	f, err := OsOpenFile(name, readMode, 0o666)

// first before it V2 migrates to V3.n
func formatErasureMigrate(export string) ([]byte, fs.FileInfo, error) {
	formatPath := pathJoin(export, minioMetaBucket, formatConfigFile)
	formatData, formatFi, err := xioutil.ReadFileWithFileInfo(formatPath)
	if err != nil {
		return nil, nil, err
	}

	version, err := formatGetBackendErasureVersion(formatData)
	if err != nil {
		return nil, nil, fmt.Errorf("Drive %s: %w", export, err)
	}