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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016, 2017, 2018 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) (mcron)
#: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 mcron))
(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)))))
(default-value (mcron-configuration)))) ;empty job list
(define* (mcron-service jobs #:optional (mcron mcron))
"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
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