// relative to /run/secrets/ position.
	if isFile(pathJoin("/run/secrets/", sp)) {
		sp = pathJoin("/run/secrets/", sp)
	}
	credBuf, err := os.ReadFile(sp)
	if err != nil {
		if os.IsNotExist(err) { // ignore if file doesn't exist.
			return "", nil
		}
		return "", err
	}
	return string(bytes.TrimSpace(credBuf)), nil
}

func loadEnvVarsFromFiles() {

		case osIsPermission(err):
			return nil, errDiskAccessDenied
		case isSysErrIO(err):
			return nil, errFaultyDisk
		case isSysErrNotDir(err):
			return nil, errDiskNotDir
		case os.IsNotExist(err):
			return nil, errDiskNotFound
		}
	}

	return w, nil
}

func (s *xlStorage) openFileSync(filePath string, mode int, skipParent string) (f *os.File, err error) {

pkg os, func Getpid() int
pkg os, func Getppid() int
pkg os, func Getuid() int
pkg os, func Getwd() (string, error)
pkg os, func Hostname() (string, error)
pkg os, func IsExist(error) bool
pkg os, func IsNotExist(error) bool
pkg os, func IsPathSeparator(uint8) bool
pkg os, func IsPermission(error) bool
pkg os, func Lchown(string, int, int) error
pkg os, func Link(string, string) error