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1 | ;;; GNU Guix --- Functional package management for GNU |
2 | ;;; Copyright © 2016 Ludovic Courtès <ludo@gnu.org> | |
3 | ;;; | |
4 | ;;; This file is part of GNU Guix. | |
5 | ;;; | |
6 | ;;; GNU Guix is free software; you can redistribute it and/or modify it | |
7 | ;;; under the terms of the GNU General Public License as published by | |
8 | ;;; the Free Software Foundation; either version 3 of the License, or (at | |
9 | ;;; your option) any later version. | |
10 | ;;; | |
11 | ;;; GNU Guix is distributed in the hope that it will be useful, but | |
12 | ;;; WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ;;; GNU General Public License for more details. | |
15 | ;;; | |
16 | ;;; You should have received a copy of the GNU General Public License | |
17 | ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. | |
18 | ||
19 | (define-module (gnu services mcron) | |
20 | #:use-module (gnu services) | |
21 | #:use-module (gnu services base) | |
22 | #:use-module (gnu services shepherd) | |
23 | #:autoload (gnu packages guile) (mcron2) | |
24 | #:use-module (guix records) | |
25 | #:use-module (guix gexp) | |
26 | #:use-module (srfi srfi-1) | |
27 | #:use-module (ice-9 match) | |
28 | #:use-module (ice-9 vlist) | |
29 | #:export (mcron-configuration | |
30 | mcron-configuration? | |
31 | mcron-configuration-mcron | |
32 | mcron-configuration-jobs | |
33 | ||
34 | mcron-service-type | |
35 | mcron-service)) | |
36 | ||
37 | ;;; Commentary: | |
38 | ;;; | |
39 | ;;; This module implements a service that to run instances of GNU mcron, a | |
40 | ;;; periodic job execution daemon. Example of a service: | |
41 | ;; | |
42 | ;; (service mcron-service-type | |
43 | ;; (mcron-configuration | |
44 | ;; (jobs (list #~(job next-second-from | |
45 | ;; (lambda () | |
46 | ;; (call-with-output-file "/dev/console" | |
47 | ;; (lambda (port) | |
48 | ;; (display "hello!\n" port))))))))) | |
49 | ;;; | |
50 | ;;; Code: | |
51 | ||
52 | (define-record-type* <mcron-configuration> mcron-configuration | |
53 | make-mcron-configuration | |
54 | mcron-configuration? | |
55 | (mcron mcron-configuration-mcron ;package | |
56 | (default mcron2)) | |
57 | (jobs mcron-configuration-jobs ;list of <mcron-job> | |
58 | (default '()))) | |
59 | ||
60 | (define (job-file job) | |
61 | (scheme-file "mcron-job" job)) | |
62 | ||
63 | (define mcron-shepherd-services | |
64 | (match-lambda | |
65 | (($ <mcron-configuration> mcron ()) ;nothing to do! | |
66 | '()) | |
67 | (($ <mcron-configuration> mcron jobs) | |
68 | (list (shepherd-service | |
69 | (provision '(mcron)) | |
70 | (requirement '(user-processes)) | |
71 | (modules `((srfi srfi-1) | |
72 | (srfi srfi-26) | |
73 | ,@%default-modules)) | |
74 | (start #~(make-forkexec-constructor | |
75 | (list (string-append #$mcron "/bin/mcron") | |
76 | #$@(map job-file jobs)) | |
77 | ||
78 | ;; Disable auto-compilation of the job files and set a | |
79 | ;; sane value for 'PATH'. | |
80 | #:environment-variables | |
81 | (cons* "GUILE_AUTO_COMPILE=0" | |
82 | "PATH=/run/current-system/profile/bin" | |
83 | (remove (cut string-prefix? "PATH=" <>) | |
84 | (environ))))) | |
85 | (stop #~(make-kill-destructor))))))) | |
86 | ||
87 | (define mcron-service-type | |
88 | (service-type (name 'mcron) | |
89 | (extensions | |
90 | (list (service-extension shepherd-root-service-type | |
91 | mcron-shepherd-services) | |
92 | (service-extension profile-service-type | |
93 | (compose list | |
94 | mcron-configuration-mcron)))) | |
95 | (compose concatenate) | |
96 | (extend (lambda (config jobs) | |
97 | (mcron-configuration | |
98 | (inherit config) | |
99 | (jobs (append (mcron-configuration-jobs config) | |
100 | jobs))))))) | |
101 | ||
102 | (define* (mcron-service jobs #:optional (mcron mcron2)) | |
103 | "Return an mcron service running @var{mcron} that schedules @var{jobs}, a | |
104 | list of gexps denoting mcron job specifications. | |
105 | ||
106 | This is a shorthand for: | |
107 | @example | |
108 | (service mcron-service-type | |
109 | (mcron-configuration (mcron mcron) (jobs jobs))) | |
110 | @end example | |
111 | " | |
112 | (service mcron-service-type | |
113 | (mcron-configuration (mcron mcron) (jobs jobs)))) | |
114 | ||
115 | ;;; mcron.scm ends here |