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: main.go
    path of file: ./repos/kubernetes/test/instrumentation
    
    the code of the file until where you have to start completion: /*
Copyright 2019 The Kubernetes Authors.

Licensed under the Apache License,
    
func findPkgDir(pkg string) (string, error) {
	// Use Go's module mechanism.
	cmd := exec.Command("go", "list", "-find", "-json=Dir", pkg)
	out, err := cmd.CombinedOutput()
	if err != nil {
		return "", fmt.Errorf("running `go list` failed: %w\n\n%s", err, string(out))
	}
	result := struct {
		Dir string
	}{}
	if err := json.Unmarshal(out, &result); err != nil {
		return "", fmt.Errorf("json unmarshal of `go list` failed: %w", err)
	}
	if result.Dir != "" {
		return result.Dir, nil
	}

	return "", fmt.Errorf("empty respose from `go list`")
}