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name: gnu/services/linux.scm 	 # note: path name is non-authoritative(*)

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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
;;; Copyright © 2020 Brice Waegeneire <brice@waegenei.re>
;;;
;;; 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 linux)
  #:use-module (guix gexp)
  #:use-module (guix records)
  #:use-module (guix modules)
  #:use-module (gnu services)
  #:use-module (gnu services shepherd)
  #:use-module (gnu system pam)
  #:use-module (gnu packages linux)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-26)
  #:use-module (srfi srfi-34)
  #:use-module (srfi srfi-35)
  #:use-module (ice-9 match)
  #:export (earlyoom-configuration
            earlyoom-configuration?
            earlyoom-configuration-earlyoom
            earlyoom-configuration-minimum-available-memory
            earlyoom-configuration-minimum-free-swap
            earlyoom-configuration-prefer-regexp
            earlyoom-configuration-avoid-regexp
            earlyoom-configuration-memory-report-interval
            earlyoom-configuration-ignore-positive-oom-score-adj?
            earlyoom-configuration-show-debug-messages?
            earlyoom-configuration-send-notification-command
            earlyoom-service-type

            kernel-module-loader-service-type

            modprobe-service-type))

\f
;;;
;;; Early OOM daemon.
;;;

(define-record-type* <earlyoom-configuration>
  earlyoom-configuration make-earlyoom-configuration
  earlyoom-configuration?
  (earlyoom earlyoom-configuration-earlyoom
            (default earlyoom))
  (minimum-available-memory earlyoom-configuration-minimum-available-memory
                            (default 10)) ; in percent
  (minimum-free-swap earlyoom-configuration-minimum-free-swap
                     (default 10))      ; in percent
  (prefer-regexp earlyoom-configuration-prefer-regexp ; <string>
                 (default #f))
  (avoid-regexp earlyoom-configuration-avoid-regexp  ; <string>
                (default #f))
  (memory-report-interval earlyoom-configuration-memory-report-interval
                          (default 0)) ; in seconds; 0 means disabled
  (ignore-positive-oom-score-adj?
   earlyoom-configuration-ignore-positive-oom-score-adj? (default #f))
  (run-with-higher-priority? earlyoom-configuration-run-with-higher-priority?
                             (default #f))
  (show-debug-messages? earlyoom-configuration-show-debug-messages?
                        (default #f))
  (send-notification-command
   earlyoom-configuration-send-notification-command  ; <string>
   (default #f)))

(define (earlyoom-configuration->command-line-args config)
  "Translate a <earlyoom-configuration> object to its command line arguments
representation."
  (match config
    (($ <earlyoom-configuration> earlyoom minimum-available-memory
                                 minimum-free-swap prefer-regexp avoid-regexp
                                 memory-report-interval
                                 ignore-positive-oom-score-adj?
                                 run-with-higher-priority? show-debug-messages?
                                 send-notification-command)
     `(,(file-append earlyoom "/bin/earlyoom")
       ,@(if minimum-available-memory
             (list "-m" (format #f "~s" minimum-available-memory))
             '())
       ,@(if minimum-free-swap
             (list "-s" (format #f "~s" minimum-free-swap))
             '())
       ,@(if prefer-regexp
             (list "--prefer" prefer-regexp)
             '())
       ,@(if avoid-regexp
             (list "--avoid" avoid-regexp)
             '())
       "-r" ,(format #f "~s" memory-report-interval)
       ,@(if ignore-positive-oom-score-adj?
             (list "-i")
             '())
       ,@(if run-with-higher-priority?
             (list "-p")
             '())
       ,@(if show-debug-messages?
             (list "-d")
             '())
       ,@(if send-notification-command
             (list "-N" send-notification-command)
             '())))))

(define (earlyoom-shepherd-service config)
  (shepherd-service
   (documentation "Run the Early OOM daemon.")
   (provision '(earlyoom))
   (start #~(make-forkexec-constructor
             '#$(earlyoom-configuration->command-line-args config)
             #:log-file "/var/log/earlyoom.log"))
   (stop #~(make-kill-destructor))))

(define earlyoom-service-type
  (service-type
   (name 'earlyoom)
   (default-value (earlyoom-configuration))
   (extensions
    (list (service-extension shepherd-root-service-type
                             (compose list earlyoom-shepherd-service))))
   (description "Run @command{earlyoom}, the Early OOM daemon.")))

\f
;;;
;;; Kernel module loader.
;;;

(define kernel-module-loader-shepherd-service
  (match-lambda
    ((and (? list? kernel-modules) ((? string?) ...))
     (shepherd-service
      (documentation "Load kernel modules.")
      (provision '(kernel-module-loader))
      (requirement '(file-systems))
      (one-shot? #t)
      (modules `((srfi srfi-1)
                 (srfi srfi-34)
                 (srfi srfi-35)
                 (rnrs io ports)
                 ,@%default-modules))
      (start
       #~(lambda _
           (cond
            ((null? '#$kernel-modules) #t)
            ((file-exists? "/proc/sys/kernel/modprobe")
             (let ((modprobe (call-with-input-file
                                 "/proc/sys/kernel/modprobe" get-line)))
               (guard (c ((message-condition? c)
                          (format (current-error-port) "~a~%"
                                  (condition-message c))
                          #f))
                 (every (lambda (module)
                          (invoke/quiet modprobe "--" module))
                        '#$kernel-modules))))
            (else
             (format (current-error-port) "error: ~a~%"
                     "Kernel is missing loadable module support.")
             #f))))))))

(define kernel-module-loader-service-type
  (service-type
   (name 'kernel-module-loader)
   (description "Load kernel modules.")
   (extensions
    (list (service-extension shepherd-root-service-type
                             (compose list kernel-module-loader-shepherd-service))))
   (compose concatenate)
   (extend append)
   (default-value '())))

\f
;;;
;;; Modprobe service.
;;;

(define (%modprobe-wrapper directory)
  "Return a wrapper for modprobe loading configuration files from CONFIG."
  ;; Wrapper for the 'modprobe' command that knows where modules live.
  ;;
  ;; This wrapper is typically invoked by the Linux kernel ('call_modprobe',
  ;; in kernel/kmod.c), a situation where the 'LINUX_MODULE_DIRECTORY'
  ;; environment variable is not set---hence the need for this wrapper.
  (let ((modprobe "/run/current-system/profile/bin/modprobe"))
    (program-file "modprobe"
                  #~(begin
                      (setenv "LINUX_MODULE_DIRECTORY"
                              "/run/booted-system/kernel/lib/modules")
                      (setenv "MODPROBE_OPTIONS"
                              (string-append "--config=" #$directory))
                      (apply execl #$modprobe
                             (cons #$modprobe (cdr (command-line))))))))

(define (modprobe->activation-gexp configs)
  "Return a gexp to tell the kernel to use modprobe configured with CONFIGS
files."
  (let ((directory (file-union "modprobe.d" configs)))
    #~(activate-modprobe #$(%modprobe-wrapper directory))))

(define (modprobe-environment configs)
  (let ((options #~(string-append
                    "--config="
                    #$(file-union "modprobe.d"
                                  configs))))
    `(("MODPROBE_OPTIONS" . ,options))))

(define modprobe-service-type
  (service-type
   (name 'modropbe)
   (description "Tell the kernel to use Guix's 'modprobe'.")
   (default-value '())                  ; list of <file-like>
   (extensions
    (list (service-extension activation-service-type
                             modprobe->activation-gexp)
          (service-extension session-environment-service-type
                             modprobe-environment)))
   (compose concatenate)
   (extend append)))

debug log:

solving 7ea30a1270 ...
found 7ea30a1270 in https://yhetil.org/guix-patches/20200704185431.13739-5-brice@waegenei.re/
found c608cc4d8d in https://yhetil.org/guix-patches/20200704185431.13739-4-brice@waegenei.re/
found 12934c2084 in https://git.savannah.gnu.org/cgit/guix.git
preparing index
index prepared:
100644 12934c2084fd3de5f47eccf004128d127397bf37	gnu/services/linux.scm

applying [1/2] https://yhetil.org/guix-patches/20200704185431.13739-4-brice@waegenei.re/
diff --git a/gnu/services/linux.scm b/gnu/services/linux.scm
index 12934c2084..c608cc4d8d 100644


applying [2/2] https://yhetil.org/guix-patches/20200704185431.13739-5-brice@waegenei.re/
diff --git a/gnu/services/linux.scm b/gnu/services/linux.scm
index c608cc4d8d..7ea30a1270 100644

Checking patch gnu/services/linux.scm...
Applied patch gnu/services/linux.scm cleanly.
Checking patch gnu/services/linux.scm...
Applied patch gnu/services/linux.scm cleanly.

index at:
100644 7ea30a1270f87b49ecf564fe31a49813edae6408	gnu/services/linux.scm

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