87 lines
3.1 KiB
Scheme
87 lines
3.1 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2017 Sou Bunnbu <iyzsong@member.fsf.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu services sysctl)
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#:use-module (gnu services)
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#:use-module (gnu services shepherd)
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#:use-module (gnu packages linux)
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#:use-module (guix gexp)
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#:use-module (guix records)
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#:use-module (srfi srfi-1)
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#:use-module (ice-9 match)
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#:export (sysctl-configuration
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sysctl-configuration-sysctl
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sysctl-configuration-settings
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sysctl-service-type
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%default-sysctl-settings))
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;;;
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;;; System Control Service.
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;;;
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(define %default-sysctl-settings
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;; Default kernel parameters enabled with sysctl.
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'(("fs.protected_hardlinks" . "1")
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("fs.protected_symlinks" . "1")))
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(define-record-type* <sysctl-configuration>
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sysctl-configuration make-sysctl-configuration
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sysctl-configuration?
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(sysctl sysctl-configuration-sysctl ; path of the 'sysctl' command
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(default (file-append procps "/sbin/sysctl")))
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(settings sysctl-configuration-settings ; alist of string pairs
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(default %default-sysctl-settings)))
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(define (sysctl-configuration-settings->sysctl.conf settings)
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"Return a file for @command{sysctl} to set kernel parameters as specified by
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@var{settings}."
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(apply mixed-text-file "sysctl.conf"
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(append-map (match-lambda
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((key . value)
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(list key "=" value "\n")))
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settings)))
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(define sysctl-shepherd-service
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(match-lambda
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(($ <sysctl-configuration> sysctl settings)
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(let ((sysctl.conf
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(sysctl-configuration-settings->sysctl.conf settings)))
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(shepherd-service
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(documentation "Configure kernel parameters at boot.")
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(provision '(sysctl))
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(start #~(lambda _
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(zero? (system* #$sysctl "--load" #$sysctl.conf))))
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(one-shot? #t))))))
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(define sysctl-service-type
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(service-type
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(name 'sysctl)
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(extensions
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(list (service-extension shepherd-root-service-type
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(compose list sysctl-shepherd-service))))
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(compose concatenate)
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(extend (lambda (config settings)
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(sysctl-configuration
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(inherit config)
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(settings (append (sysctl-configuration-settings config)
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settings)))))
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(default-value (sysctl-configuration))
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(description "Set Linux kernel parameters under @file{/proc/sys} at system
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startup time.")))
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