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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-configuration-sysctl
sysctl-configuration-settings
sysctl-service-type
%default-sysctl-settings))
;;;
;;; System Control Service.
;;;
(define %default-sysctl-settings
;; Default kernel parameters enabled with sysctl.
'(("fs.protected_hardlinks" . "1")
("fs.protected_symlinks" . "1")))
(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 %default-sysctl-settings)))
(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))))
(one-shot? #t))))))
(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))
(description "Set Linux kernel parameters under @file{/proc/sys} at system
startup time.")))
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