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1 | ;;; GNU Guix --- Functional package management for GNU |
2 | ;;; Copyright © 2017 Sou Bunnbu <iyzsong@member.fsf.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 sysctl) | |
20 | #:use-module (gnu services) | |
21 | #:use-module (gnu services shepherd) | |
22 | #:use-module (gnu packages linux) | |
23 | #:use-module (guix gexp) | |
24 | #:use-module (guix records) | |
25 | #:use-module (srfi srfi-1) | |
26 | #:use-module (ice-9 match) | |
27 | #:export (sysctl-configuration | |
4f547c50 | 28 | sysctl-configuration-sysctl |
29 | sysctl-configuration-settings | |
898489f4 LF |
30 | sysctl-service-type |
31 | %default-sysctl-settings)) | |
296bf4d5 SB |
32 | |
33 | \f | |
34 | ;;; | |
35 | ;;; System Control Service. | |
36 | ;;; | |
37 | ||
898489f4 LF |
38 | (define %default-sysctl-settings |
39 | ;; Default kernel parameters enabled with sysctl. | |
40 | '(("fs.protected_hardlinks" . "1") | |
41 | ("fs.protected_symlinks" . "1"))) | |
42 | ||
296bf4d5 | 43 | (define-record-type* <sysctl-configuration> |
172b3e2c | 44 | sysctl-configuration make-sysctl-configuration |
296bf4d5 SB |
45 | sysctl-configuration? |
46 | (sysctl sysctl-configuration-sysctl ; path of the 'sysctl' command | |
47 | (default (file-append procps "/sbin/sysctl"))) | |
48 | (settings sysctl-configuration-settings ; alist of string pairs | |
898489f4 | 49 | (default %default-sysctl-settings))) |
296bf4d5 SB |
50 | |
51 | (define (sysctl-configuration-settings->sysctl.conf settings) | |
52 | "Return a file for @command{sysctl} to set kernel parameters as specified by | |
53 | @var{settings}." | |
54 | (apply mixed-text-file "sysctl.conf" | |
55 | (append-map (match-lambda | |
56 | ((key . value) | |
57 | (list key "=" value "\n"))) | |
58 | settings))) | |
59 | ||
60 | (define sysctl-shepherd-service | |
61 | (match-lambda | |
62 | (($ <sysctl-configuration> sysctl settings) | |
63 | (let ((sysctl.conf | |
64 | (sysctl-configuration-settings->sysctl.conf settings))) | |
65 | (shepherd-service | |
66 | (documentation "Configure kernel parameters at boot.") | |
67 | (provision '(sysctl)) | |
68 | (start #~(lambda _ | |
69 | (zero? (system* #$sysctl "--load" #$sysctl.conf)))) | |
77ed06a8 | 70 | (one-shot? #t)))))) |
296bf4d5 SB |
71 | |
72 | (define sysctl-service-type | |
73 | (service-type | |
74 | (name 'sysctl) | |
75 | (extensions | |
76 | (list (service-extension shepherd-root-service-type | |
77 | (compose list sysctl-shepherd-service)))) | |
78 | (compose concatenate) | |
79 | (extend (lambda (config settings) | |
80 | (sysctl-configuration | |
81 | (inherit config) | |
82 | (settings (append (sysctl-configuration-settings config) | |
83 | settings))))) | |
84 | (default-value (sysctl-configuration)))) |