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+;;; 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