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services: configuration: Change the value of the unset marker.

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The new value of %unset-value sticks out more when something goes wrong, and
is also more unique; i.e. easier to search for.

Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
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Attila Lendvai 2022-08-24 14:40:42 +02:00 • committed by Maxim Cournoyer
parent ee08277a70
commit 6fb9759ef3
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3 changed files with 5 additions and 4 deletions
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gnu/services/configuration.scm
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@ -305,12 +305,13 @@ does not have a default value" field kind)))
;; Ideally this should be an implementation detail, but we export it
;; to provide a simpler API that enables unsetting a configuration
;; field that has a maybe type, but also a default value.
;; field that has a maybe type, but also a default value. We give it
;; a value that sticks out to the reader when something goes wrong.
;;
;; An example use-case would be something like a network application
;; that uses a default port, but the field can explicitly be unset to
;; request a random port at startup.
(define %unset-value 'unset)
(define %unset-value '%unset-marker%)
(define (maybe-value-set? value)
"Predicate to check whether a 'maybe' value was explicitly provided."