;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;;
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;;; GNU General Public License for more details.
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;;; 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 shepherd)
  #:use-module (gnu packages guile-xyz)
  #:use-module (guix deprecation)
  #:use-module (guix records)
  #:use-mo</td></tr></table>
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ace with the SIGCHLD handler, which
                   ;; could call 'waitpid' before 'close-pipe' above does.  If
                   ;; we get ECHILD, that means we lost the race, but that's
                   ;; fine.
                   (or (= ECHILD (system-error-errno args))
                       (apply throw args)))))
              (line
               (display line)
               (loop)))))))))

(define mcron-shepherd-services
  (match-lambda
    (($ <mcron-configuration> mcron ())           ;nothing to do!
     '())
    (($ <mcron-configuration> mcron jobs)
     (let ((files (job-files mcron jobs)))
       (list (shepherd-service
              (provision '(mcron))
              (requirement '(user-processes))
              (modules `((srfi srfi-1)
                         (srfi srfi-26)
                         (ice-9 popen)            ;for the 'schedule' action
                         (ice-9 rdelim)
                         (ice-9 match)
                         ,@%default-modules))
              (start #~(make-forkexec-constructor
                        (list (string-append #$mcron "/bin/mcron") #$@files)

                        ;; 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)))

                        #:log-file "/var/log/mcron.log"))
              (stop #~(make-kill-destructor))

              (actions
               (list (shepherd-schedule-action mcron files)))))))))

(define mcron-service-type
  (service-type (name 'mcron)
                (description
                 "Run the mcron job scheduling daemon.")
                (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-deprecated (mcron-service jobs #:optional (mcron mcron))
  mcron-service-type
  "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