;;; 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.")))
'/guix/commit/gnu/packages/microcom.scm?id=d9a746d43d23578e4162cf7046afa241634395d0'>gnu: microcom: Update to 2017.03.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/microcom.scm (microcom): Update to 2017.03.0.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-12-03 01:52:45 +0100'>2019-12-03</span></td><td><a href='/guix/commit/gnu/packages/microcom.scm?id=b73a930703bb2792633d7ea9fc068ce669d3850f'>gnu: microcom: Use GIT-FILE-NAME.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/microcom.scm (microcom)[source]: Use GIT-FILE-NAME.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-03-31 20:51:10 +0300'>2019-03-31</span></td><td><a href='/guix/commit/gnu/packages/microcom.scm?id=36a4366d79a310d05db0de2cf6d5bb3c5e861d4b'>gnu: Fix descriptions to not use quotes.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/admin.scm (wpa-supplicant-minimal, mingetty, di),
* gnu/packages/audio.scm (fil-plugins),
* gnu/packages/base.scm (make-ld-wrapper, make-glibc-locales),
* gnu/packages/bioinformatics.scm (r-samtools),
* gnu/packages/chez.scm (chez-mit),
* gnu/packages/commencement.scm (make-gcc-toolchain),
* gnu/packages/compression.scm (fastjar),
* gnu/packages/cran.scm (r-maps, r-rcpp),
* gnu/packages/databases.scm (sparql-query),
* gnu/packages/dunst.scm (dunst),
* gnu/packages/ftp.scm (ncftp),
* gnu/packages/gl.scm (freeglut),
* gnu/packages/haskell-check.scm (ghc-tasty-golden),
* gnu/packages/haskell.scm (ghc-case-insensitive, ghc-text,
ghc-haskell-src, ghc-syb, ghc-deepseq-generics, ghc-network-uri,
ghc-rerebase, ghc-zlib),
* gnu/packages/image.scm (jbig2dec),
* gnu/packages/kde-frameworks.scm (kinit, karchive),
* gnu/packages/linux.scm (wireless-tools, perf, module-init-tools, kbd),
* gnu/packages/lirc.scm (lirc),
* gnu/packages/lisp.scm (uglify-js),
* gnu/packages/mate.scm (mate-netbook),
* gnu/packages/microcom.scm (microcom),
* gnu/packages/music.scm (bristol),
* gnu/packages/networking.scm (perl-geo-ip),
* gnu/packages/patchutils.scm (patches),
* gnu/packages/perl-check.scm (perl-test-more-utf8),
* gnu/packages/perl.scm (perl-log-report-optional, perl-file-which,
perl-io-tty, perl-log-any, perl-digest-sha1, perl-class-load,
perl-regexp-common, perl-module-pluggable, perl-class-modifier),
* gnu/packages/python-xyz.scm (python-backports-abc, python-natsort),
* gnu/packages/samba.scm (iniparser),
* gnu/packages/search.scm (mlocate),
* gnu/packages/spice.scm (spice),
* gnu/packages/statistics.scm (r-dt, r-lubridate, r-estimability,
r-commonmark, r-digest, r-viridislite, r-stringr),
* gnu/packages/tex.scm (texlive-latex-changebar),
* gnu/packages/version-control.scm (subversion),
* gnu/packages/w3m.scm (w3m),
* gnu/packages/web.scm (perl-http-parser,
perl-plack-middleware-reverseproxy),
* gnu/packages/xorg.scm (xkeyboard-config, mkfontdir, xcursor-theme,
mkfontscale, xinit, font-alias)[description]: Use @code instead of quotes.
</span></span></td><td>Efraim Flashner</td></tr>