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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2021, 2023 Andrew Tropin <andrew@trop.in>
;;; Copyright © 2021 Xinglu Chen <public@yoctocell.xyz>
;;; Copyright © 2022 Maxim Cournoyer <maxim.cournoyer@gmail.com>
;;;
;;; 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 home services mcron)
#:use-module (gnu packages guile-xyz)
#:use-module (gnu home services)
#:use-module (gnu services configuration)
#:use-module (gnu services shepherd)
#:use-module (gnu home services shepherd)
#:use-module (guix records)
#:use-module (guix gexp)
#:use-module (srfi srfi-1)
#:use-module (ice-9 match)
#:export (home-mcron-configuration
home-mcron-service-type))
;;; Commentary:
;;
;; Service for the GNU mcron cron job manager.
;;
;; Example configuration, the first job runs mbsync once every ten
;; minutes, the second one writes "Mcron service" to ~/mcron-file once
;; every minute.
;;
;; (service home-mcron-service-type
;; (home-mcron-configuration
;; (jobs (list #~(job '(next-minute
;; (range 0 60 10))
;; (lambda ()
;; (system* "mbsync" "--all")))
;; #~(job next-minute-from
;; (lambda ()
;; (call-with-output-file (string-append (getenv "HOME")
;; "/mcron-file")
;; (lambda (port)
;; (display "Mcron service" port)))))))))
;;
;;; Code:
(define list-of-gexps?
(list-of gexp?))
(define-configuration/no-serialization home-mcron-configuration
(mcron (file-like mcron) "The mcron package to use.")
(jobs
(list-of-gexps '())
"This is a list of gexps (@pxref{G-Expressions}), where each gexp
corresponds to an mcron job specification (@pxref{Syntax, mcron job
specifications,, mcron, GNU@tie{}mcron}).")
(log? (boolean #t) "Log messages to standard output.")
(log-format
(string "~1@*~a ~a: ~a~%")
"@code{(ice-9 format)} format string for log messages. The default value
produces messages like \"@samp{@var{pid} @var{name}:
@var{message}\"} (@pxref{Invoking mcron, Invoking,, mcron, GNU@tie{}mcron}).
Each message is also prefixed by a timestamp by GNU Shepherd."))
(define job-files (@@ (gnu services mcron) job-files))
(define shepherd-schedule-action
(@@ (gnu services mcron) shepherd-schedule-action))
(define (home-mcron-shepherd-services config)
(match-record config <home-mcron-configuration>
(mcron jobs log? log-format)
(if (null? jobs)
'() ;no jobs to run
(let ((files (job-files mcron jobs)))
(list (shepherd-service
(documentation "User cron jobs.")
(provision '(mcron))
(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 #$mcron "/bin/mcron")
#$@(if log?
#~("--log" "--log-format" #$log-format)
#~())
#$@files)
#:log-file (string-append
(or (getenv "XDG_STATE_HOME")
(format #f "~a/.local/state"
(getenv "HOME")))
"/log/mcron.log")))
(stop #~(make-kill-destructor))
(actions
(list (shepherd-schedule-action mcron files)))))))))
(define home-mcron-profile (compose list home-mcron-configuration-mcron))
(define (home-mcron-extend config jobs)
(home-mcron-configuration
(inherit config)
(jobs (append (home-mcron-configuration-jobs config)
jobs))))
(define home-mcron-service-type
(service-type (name 'home-mcron)
(extensions
(list (service-extension
home-shepherd-service-type
home-mcron-shepherd-services)
(service-extension
home-profile-service-type
home-mcron-profile)))
(compose concatenate)
(extend home-mcron-extend)
(default-value (home-mcron-configuration))
(description
"Install and configure the GNU mcron cron job manager.")))
;;;
;;; Generate documentation.
;;;
(define (generate-doc)
(configuration->documentation 'home-mcron-configuration))
;;; mcron.scm ends here
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