fun cleanupPerformanceTestSplits(os: Os): BuildSteps.() -> Unit {
    val unixScript = """
rm -rf $PERFORMANCE_TEST_SPLIT_DIRECTORY_NAME
"""

    val windowsScript = """
if exist $PERFORMANCE_TEST_SPLIT_DIRECTORY_NAME rmdir /s /q $PERFORMANCE_TEST_SPLIT_DIRECTORY_NAME
"""

    return {
        script {
            name = "CLEANUP_PERFORMANCE_TEST_SPLITS"
            executionMode = BuildStep.ExecutionMode.ALWAYS

	clnt, err := f.getMinIOClient()
	if err != nil {
		return err
	}

	switch r.Method {
	case "Setstat", "Rename", "Link", "Symlink":
		return sftp.ErrSSHFxOpUnsupported

	case "Rmdir":
		bucket, prefix := path2BucketObject(r.Filepath)
		if bucket == "" {
			return errors.New("deleting all buckets not allowed")
		}

		cctx, cancel := context.WithCancel(context.Background())
		defer cancel()

			readdir(path, callback) { callback(enosys()); },
			readlink(path, callback) { callback(enosys()); },
			rename(from, to, callback) { callback(enosys()); },
			rmdir(path, callback) { callback(enosys()); },
			stat(path, callback) { callback(enosys()); },
			symlink(path, link, callback) { callback(enosys()); },
			truncate(path, length, callback) { callback(enosys()); },