Hello Guix,

here are some improvements.

Remove all (pk) from service.

Set home directory according to rsync-user.
--8<---------------cut here---------------start------------->8---
(define (rsync-account config)
  (list …
         (home-directory (string-append "/var/run/"
                                        rsync-user)))))
--8<---------------cut here---------------end--------------->8---

Change name in test.
--8<---------------cut here---------------start------------->8---
(define %test-rsync
  (system-test
   (name "rsync")
   …))
--8<---------------cut here---------------end--------------->8---