// syscall.ENOENT (parent does not exist).
func reliableMkdirAll(dirPath string, mode os.FileMode, baseDir string) (err error) {
	i := 0
	for {
		// Creates all the parent directories, with mode 0777 mkdir honors system umask.
		if err = osMkdirAll(dirPath, mode, baseDir); err != nil {
			// Retry only for the first retryable error.
			if osIsNotExist(err) && i == 0 {
				i++
				// Determine if os.NotExist error is because of