func prepareConfigFile()

in main.go [35:92]
46 lines of code
11 McCabe index (conditional complexity)

func prepareConfigFile(ctx *cli.Context) error {
	// Prepare the config directory at $HOME/.aztfexport
	homeDir, err := os.UserHomeDir()
	if err != nil {
		return fmt.Errorf("retrieving the user's HOME directory: %v", err)
	}
	configDir := filepath.Join(homeDir, cfgfile.CfgDirName)
	if err := os.MkdirAll(configDir, 0750); err != nil {
		return fmt.Errorf("creating the config directory at %s: %v", configDir, err)
	}
	configFile := filepath.Join(configDir, cfgfile.CfgFileName)

	_, err = os.Stat(configFile)
	if err == nil {
		return nil
	}
	if !os.IsNotExist(err) {
		return nil
	}

	// Generate a configuration file if not exist.

	// Get the installation id from following sources in order:
	// 1. The Azure CLI's configuration file
	// 2. The Azure PWSH's configuration file
	// 3. Generate one
	id, err := func() (string, error) {
		if id, err := cfgfile.GetInstallationIdFromCLI(); err == nil {
			return id, nil
		}
		if id, err := cfgfile.GetInstallationIdFromPWSH(); err == nil {
			return id, nil
		}
		uuid, err := uuid.NewV4()
		if err != nil {
			return "", fmt.Errorf("generating installation id: %w", err)
		}
		return uuid.String(), nil
	}()

	if err != nil {
		return err
	}

	cfg := cfgfile.Configuration{
		InstallationId:   id,
		TelemetryEnabled: true,
	}
	b, err := json.Marshal(cfg)
	if err != nil {
		return fmt.Errorf("marshalling the configuration file: %v", err)
	}
	// #nosec G306
	if err := os.WriteFile(configFile, b, 0644); err != nil {
		return fmt.Errorf("writing the configuration file: %v", err)
	}
	return nil
}