func FindTerraform()

in tf/terraform_install.go [16:61]
35 lines of code
8 McCabe index (conditional complexity)

func FindTerraform(ctx context.Context) (string, error) {

	// Initialize the workspace
	cacheDir, err := os.UserCacheDir()
	if err != nil {
		return "", fmt.Errorf("error finding the user cache directory: %w", err)
	}
	rootDir := filepath.Join(cacheDir, "armstrong")
	if err := os.MkdirAll(rootDir, 0755); err != nil {
		return "", fmt.Errorf("creating workspace root %q: %w", rootDir, err)
	}
	tfDir := filepath.Join(rootDir, "terraform")
	if err := os.MkdirAll(tfDir, 0755); err != nil {
		return "", fmt.Errorf("creating terraform cache dir %q: %w", tfDir, err)
	}

	var terraformPath string
	opts := []tfinstall.ExecPathFinder{
		tfinstall.ExactPath(filepath.Join(tfDir, terraformBinary)),
		tfinstall.LookPath(),
		tfinstall.LatestVersion(tfDir, false),
	}

	// go through the options in order
	// until a valid terraform executable is found
	for _, opt := range opts {
		p, err := opt.ExecPath(ctx)
		if err != nil {
			return "", fmt.Errorf("unexpected error: %w", err)
		}

		if p == "" {
			// strategy did not locate an executable - fall through to next
			continue
		}

		terraformPath = p
		break
	}

	if terraformPath == "" {
		return "", fmt.Errorf("could not find terraform executable")
	}

	return terraformPath, nil
}