;;; 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))))
        (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))))
span></td><td>Herman Rimm</td></tr>
<tr><td><span title='2024-06-03 22:58:53 +0200'>2024-06-03</span></td><td><a href='/guix/commit/tests/crate.scm?id=e62fd9004bf0e4a9b32f7ce3c1192aa067349b83'>import: crate: Include a main verb in crate importer descriptions.</a><span class='msg-avail'>...</span></td><td>Herman Rimm</td></tr>
<tr><td><span title='2024-01-09 09:38:38 +0200'>2024-01-09</span></td><td><a href='/guix/commit/tests/crate.scm?id=b26926189e5bf253093050f9a73f2d9d7555cc3e'>guix: import: Optionally import necessary yanked crates.</a><span class='msg-avail'>...</span></td><td>David Elsing</td></tr>
<tr><td><span title='2024-01-09 09:38:38 +0200'>2024-01-09</span></td><td><a href='/guix/commit/tests/crate.scm?id=53add91be621a9d97e534397f16f71e071eaba96'>tests: Mock find-packages-by-name in crate importer test.</a><span class='msg-avail'>...</span></td><td>David Elsing</td></tr>
<tr><td><span title='2024-01-09 09:38:38 +0200'>2024-01-09</span></td><td><a href='/guix/commit/tests/crate.scm?id=9f44ff2bb47c964d53905cea17c4bda758cce509'>import: crate: Optionally import dev-dependencies recursively.</a><span class='msg-avail'>...</span></td><td>David Elsing</td></tr>
<tr><td><span title='2023-10-22 16:46:39 +0300'>2023-10-22</span></td><td><a href='/guix/commit/tests/crate.scm?id=742554f9b973610a54ada9dee2971939cc36ddd7'>guix: import: Don't import yanked rust crates.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2022-05-30 16:34:39 +0200'>2022-05-30</span></td><td><a href='/guix/commit/tests/crate.scm?id=61d4f9e89da8471ecf4df93ab25c0d707797122a'>tests: Adjust crate importer test to spdx changes.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>