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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.")))
