identity.rb

        private

        def authenticate
          # puts "===== Fog::Identity::OpenStackCommon -> authenticate ====="
          if !@openstack_management_url || @openstack_must_reauthenticate
            case @openstack_auth_uri.path
            when /v1(\.\d+)?/
              Fog::OpenStackCommon::Authenticator.adapter = :authenticator_v1
            else
              Fog::OpenStackCommon::Authenticator.adapter = :authenticator_v2
            end

            options = init_auth_options
            credentials = Fog::OpenStackCommon::Authenticator.adapter.authenticate(options, @service_options)
            handle_auth_results(credentials)
          else
            @auth_token = @openstack_auth_token
          end

          save_host_attributes
          credentials
        end