(mapped-devices (list (mapped-device
        (source (uuid "b9838a5b-8c9a-4343-8e51-78a9551bf067"))
        (target "root-luks")
        (type luks-device-mapping))))

(file-systems (cons (file-system
                      (device "my-root")
                      (title 'label)
                      (mount-point "/")
                      (type "ext4")
                      (dependencies mapped-devices))
                    %base-file-systems))