;;; 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))))
<td><a href='/guix/commit/gnu/packages/javascript.scm?id=1e5929511208d3d741c6738c17854eff6dba6ab6'>gnu: mujs: Update to 1.3.5.</a><span class='msg-avail'>...</span></td><td>宋文武</td></tr>
<tr><td><span title='2024-04-07 10:06:43 +0300'>2024-04-07</span></td><td><a href='/guix/commit/gnu/packages/javascript.scm?id=f6a62ce9ba3d63aa043560f8f5697e80bf1db728'>gnu: quickjs: Update to 2024-01-13.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2024-04-07 09:40:01 +0300'>2024-04-07</span></td><td><a href='/guix/commit/gnu/packages/javascript.scm?id=8ec53cabf24136cab354360b7536ba69424e8608'>gnu: quickjs: Fix building on powerpc-linux.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2024-04-07 09:31:43 +0300'>2024-04-07</span></td><td><a href='/guix/commit/gnu/packages/javascript.scm?id=f3460a82c84ffa06c3d1c7c095b91f8095c529e6'>gnu: quickjs: Remove pre-generated documentation.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2024-03-19 18:35:57 +0800'>2024-03-19</span></td><td><a href='/guix/commit/gnu/packages/javascript.scm?id=8a4ed004d6b0720f47fc6ef5f0247a66a42a2f7c'>gnu: quickjs: Honor the #:tests? flag.</a><span class='msg-avail'>...</span></td><td>Zheng Junjie</td></tr>
<tr><td><span title='2024-03-19 18:35:44 +0800'>2024-03-19</span></td><td><a href='/guix/commit/gnu/packages/javascript.scm?id=efad468f6d51133c967205c8b9fb8e52a8bfd05e'>gnu: quickjs: Use G-expressions.</a><span class='msg-avail'>...</span></td><td>Zheng Junjie</td></tr>
<tr><td><span title='2024-03-19 18:35:18 +0800'>2024-03-19</span></td><td><a href='/guix/commit/gnu/packages/javascript.scm?id=3c46191abd0ab1e6cf24ddfedafbd9b646989f5c'>gnu: quickjs: Fix building on riscv64-linux.</a><span class='msg-avail'>...</span></td><td>Zheng Junjie</td></tr>
<tr><td><span title='2023-12-15 16:13:07 +0100'>2023-12-15</span></td><td><a href='/guix/commit/gnu/packages/javascript.scm?id=5374d0d89bea12582d01e13a5cb38b7ff63aa0e5'>gnu: Add js-datatables-1.9.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2023-12-02 12:25:45 +0100'>2023-12-02</span></td><td><a href='/guix/commit/gnu/packages/javascript.scm?id=b0715d7cd2a74bc231751f8afc9dffb2047501ac'>gnu: Use ‘libc-utf8-locales-for-target’.</a><span class='msg-avail'>...</span></td><td>Janneke Nieuwenhuizen</td></tr>
<tr><td><span title='2023-07-09 02:00:24 +0200'>2023-07-09</span></td><td><a href='/guix/commit/gnu/packages/javascript.scm?id=2687f7d2c2d18ba4fd0b9dadc6afa658530cd643'>gnu: cjson: Update to 1.7.16.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>