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services: Error in MODIFY-SERVICES when services don't exist

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This patch causes MODIFY-SERVICES to raise an error if a reference is made to
a service which isn't in its service list. This it to help users notice if
they have an invalid rule, which is currently silently ignored.

* gnu/services.scm (%delete-service):  new procedure
(%apply-clauses): new syntax rule
(%modify-service): remove syntax rule

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Brian Cully 2023-05-26 18:30:17 -04:00 committed by Ludovic Courtès
parent ae707b62e7
commit dbbc7e9461
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GPG key ID: 090B11993D9AEBB5
1 changed files with 31 additions and 17 deletions
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48
gnu/services.scm
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@ -6,6 +6,7 @@
;;; Copyright © 2021 raid5atemyhomework <raid5atemyhomework@protonmail.com>
;;; Copyright © 2020 Christine Lemmer-Webber <cwebber@dustycloud.org>
;;; Copyright © 2020, 2021 Brice Waegeneire <brice@waegenei.re>
;;; Copyright © 2023 Brian Cully <bjc@spork.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -296,20 +297,35 @@ (define (simple-service name target value)
(description "This is a simple service."))))
(service type value)))
(define-syntax %modify-service
(define (%delete-service kind services)
(let loop ((found #f)
(return '())
(services services))
(match services
('()
(if found
(values return found)
(raise (formatted-message
(G_ "modify-services: service '~a' not found in service list")
(service-type-name kind)))))
((service . rest)
(if (eq? (service-kind service) kind)
(loop service return rest)
(loop found (cons service return) rest))))))
(define-syntax %apply-clauses
(syntax-rules (=> delete)
((_ svc (delete kind) clauses ...)
(if (eq? (service-kind svc) kind)
#f
(%modify-service svc clauses ...)))
((_ service)
service)
((_ svc (kind param => exp ...) clauses ...)
(if (eq? (service-kind svc) kind)
(let ((param (service-value svc)))
(service (service-kind svc)
(begin exp ...)))
(%modify-service svc clauses ...)))))
((_ ((delete kind) . rest) services)
(%apply-clauses rest (%delete-service kind services)))
((_ ((kind param => exp ...) . rest) services)
(call-with-values (lambda () (%delete-service kind services))
(lambda (svcs found)
(let ((param (service-value found)))
(cons (service (service-kind found)
(begin exp ...))
(%apply-clauses rest svcs))))))
((_ () services)
services)))
(define-syntax modify-services
(syntax-rules ()
@ -345,10 +361,8 @@ (define-syntax modify-services
UDEV-SERVICE-TYPE.
This is a shorthand for (filter-map (lambda (svc) ...) %base-services)."
((_ services clauses ...)
(filter-map (lambda (service)
(%modify-service service clauses ...))
services))))
((_ services . clauses)
(%apply-clauses clauses services))))
;;;