You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: nodes.go
    path of file: ./repos/heketi/pkg/testutils
    
    the code of the file until where you have to start completion: //go:build functional
// +build functional

//
// Copyright (c) 2018 The heketi Authors
//
// This file is licensed to you under your choice of the GNU Lesser
// General Public License, version 3 or any later version (LGPLv3 or
// later), as published by the Free Software Foundation,
// or under the Apache License, Version 2.0 <LICENSE-APACHE2 or
// http://www.apache.org/licenses/LICENSE-2.0>.
//
// You may not use this file except in compliance with those terms.
//

package testutils

imp
    
func RequireNodeAccess(t *testing.T) *sshAccess {
	// t.Helper()
	// TODO: Helper not available prior to Go1.9, enable once Go1.8 is dropped
	v := os.Getenv("HEKETI_TEST_NODE_ACCESS")
	switch v {
	// default/traditional behavior
	case "":
		return &sshAccess{DefaultSshUser, DefaultSshKeyFile}
	case "skip":
		// setting HEKETI_TEST_NODE_ACCESS to no puts
		// a blanket skip on all tests that want node access
		t.Skipf("remote node access disabled (HEKETI_TEST_NODE_ACCESS=%v)", v)
	default:
		t.Skipf("remote node access unknown (HEKETI_TEST_NODE_ACCESS=%v)", v)
	}
	return nil
}