From mboxrd@z Thu Jan  1 00:00:00 1970
From: Danny Milosavljevic <dannym@scratchpost.org>
Subject: Re: GuixSD encrypted root?
Date: Tue, 19 Apr 2016 09:51:16 +0200
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To: guix-devel@gnu.org

And when I add a file-system like this

(define dayas-sys (mapped-device
                         (source (uuid "blahblahblah"))
                         (target "dayas-sys")
                         (type luks-device-mapping)))


...
  (mapped-devices (list dayas-sys))
  (file-systems (cons* (file-system
                        (device "/dev/sda1")
                        (title 'dayas:/)
                        (mount-point "/")
                        (type "ext4")
                        (needed-for-boot? #t))
                       (file-system
                        (device "/dev/mapper/dayas-sys")
                        (mount-point "/x")
                        (type "btrfs")
                        (needed-for-boot? #f)
                        (dependencies (list dayas-sys)))
                       %base-file-systems))

system reconfigure hangs at

  guix system: shepherd: Removing service 'file-system-/x'...
  guix system: shepherd: Done.
  guix system: loading new services: file-system-/x...
  guix system: shepherd: Evaluating user expression (register-services (primitive-load "/gnu/s...")).

.

Unfortunately because of the abbreviation in the output of the command above                  ^^^ I have no idea what it's trying to do.

The device has already been mapped at /dev/mapper/dayas-sys , however it has not yet mounted the filesystem as /x .