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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2017 Sou Bunnbu <iyzsong@member.fsf.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 sysctl)
+ #:use-module (gnu services)
+ #:use-module (gnu services shepherd)
+ #:use-module (gnu packages linux)
+ #:use-module (guix gexp)
+ #:use-module (guix records)
+ #:use-module (srfi srfi-1)
+ #:use-module (ice-9 match)
+ #:export (sysctl-configuration
+ sysctl-service-type))
+
+
+;;;
+;;; System Control Service.
+;;;
+
+(define-record-type* <sysctl-configuration>
+ sysctl-configuration make-sysctl-configuration?
+ sysctl-configuration?
+ (sysctl sysctl-configuration-sysctl ; path of the 'sysctl' command
+ (default (file-append procps "/sbin/sysctl")))
+ (settings sysctl-configuration-settings ; alist of string pairs
+ (default '())))
+
+(define (sysctl-configuration-settings->sysctl.conf settings)
+ "Return a file for @command{sysctl} to set kernel parameters as specified by
+@var{settings}."
+ (apply mixed-text-file "sysctl.conf"
+ (append-map (match-lambda
+ ((key . value)
+ (list key "=" value "\n")))
+ settings)))
+
+(define sysctl-shepherd-service
+ (match-lambda
+ (($ <sysctl-configuration> sysctl settings)
+ (let ((sysctl.conf
+ (sysctl-configuration-settings->sysctl.conf settings)))
+ (shepherd-service
+ (documentation "Configure kernel parameters at boot.")
+ (provision '(sysctl))
+ (start #~(lambda _
+ (zero? (system* #$sysctl "--load" #$sysctl.conf))))
+ (stop #~(const #t))
+ (respawn? #f))))))
+
+(define sysctl-service-type
+ (service-type
+ (name 'sysctl)
+ (extensions
+ (list (service-extension shepherd-root-service-type
+ (compose list sysctl-shepherd-service))))
+ (compose concatenate)
+ (extend (lambda (config settings)
+ (sysctl-configuration
+ (inherit config)
+ (settings (append (sysctl-configuration-settings config)
+ settings)))))
+ (default-value (sysctl-configuration))))