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Diffstat (limited to 'gnu/services/mcron.scm')
| -rw-r--r-- | gnu/services/mcron.scm | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/gnu/services/mcron.scm b/gnu/services/mcron.scm new file mode 100644 index 0000000000..313c8364f8 --- /dev/null +++ b/gnu/services/mcron.scm @@ -0,0 +1,115 @@ +;;; GNU Guix --- Functional package management for GNU +;;; Copyright © 2016 Ludovic Courtès <ludo@gnu.org> +;;; +;;; This file is part of GNU Guix. +;;; +;;; GNU Guix is free software; you can redistribute it and/or modify it +;;; under the terms of the GNU General Public License as published by +;;; the Free Software Foundation; either version 3 of the License, or (at +;;; your option) any later version. +;;; +;;; GNU Guix is distributed in the hope that it will be useful, but +;;; WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +;;; GNU General Public License for more details. +;;; +;;; You should have received a copy of the GNU General Public License +;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. + +(define-module (gnu services mcron) + #:use-module (gnu services) + #:use-module (gnu services base) + #:use-module (gnu services shepherd) + #:autoload (gnu packages guile) (mcron2) + #:use-module (guix records) + #:use-module (guix gexp) + #:use-module (srfi srfi-1) + #:use-module (ice-9 match) + #:use-module (ice-9 vlist) + #:export (mcron-configuration + mcron-configuration? + mcron-configuration-mcron + mcron-configuration-jobs + + mcron-service-type + mcron-service)) + +;;; Commentary: +;;; +;;; This module implements a service that to run instances of GNU mcron, a +;;; periodic job execution daemon. Example of a service: +;; +;; (service mcron-service-type +;; (mcron-configuration +;; (jobs (list #~(job next-second-from +;; (lambda () +;; (call-with-output-file "/dev/console" +;; (lambda (port) +;; (display "hello!\n" port))))))))) +;;; +;;; Code: + +(define-record-type* <mcron-configuration> mcron-configuration + make-mcron-configuration + mcron-configuration? + (mcron mcron-configuration-mcron ;package + (default mcron2)) + (jobs mcron-configuration-jobs ;list of <mcron-job> + (default '()))) + +(define (job-file job) + (scheme-file "mcron-job" job)) + +(define mcron-shepherd-services + (match-lambda + (($ <mcron-configuration> mcron ()) ;nothing to do! + '()) + (($ <mcron-configuration> mcron jobs) + (list (shepherd-service + (provision '(mcron)) + (requirement '(user-processes)) + (modules `((srfi srfi-1) + (srfi srfi-26) + ,@%default-modules)) + (start #~(make-forkexec-constructor + (list (string-append #$mcron "/bin/mcron") + #$@(map job-file jobs)) + + ;; Disable auto-compilation of the job files and set a + ;; sane value for 'PATH'. + #:environment-variables + (cons* "GUILE_AUTO_COMPILE=0" + "PATH=/run/current-system/profile/bin" + (remove (cut string-prefix? "PATH=" <>) + (environ))))) + (stop #~(make-kill-destructor))))))) + +(define mcron-service-type + (service-type (name 'mcron) + (extensions + (list (service-extension shepherd-root-service-type + mcron-shepherd-services) + (service-extension profile-service-type + (compose list + mcron-configuration-mcron)))) + (compose concatenate) + (extend (lambda (config jobs) + (mcron-configuration + (inherit config) + (jobs (append (mcron-configuration-jobs config) + jobs))))))) + +(define* (mcron-service jobs #:optional (mcron mcron2)) + "Return an mcron service running @var{mcron} that schedules @var{jobs}, a +list of gexps denoting mcron job specifications. + +This is a shorthand for: +@example + (service mcron-service-type + (mcron-configuration (mcron mcron) (jobs jobs))) +@end example +" + (service mcron-service-type + (mcron-configuration (mcron mcron) (jobs jobs)))) + +;;; mcron.scm ends here |