[PATCH] services: Add console-keymap service.

[Alex Kost <alezost@gmail.com>]

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Sometimes people on #guix ask about a way to change a console keymap,
for example: <https://gnunet.org/bot/log/guix/2015-04-25#T640696>.

So I think it would be good to add a service for loadkeys, what do
people think?

宋文武: This patch is based on your work
<http://lists.gnu.org/archive/html/guix-devel/2014-11/msg00692.html>, so
I tried to credit you in a commit message, but I'm not sure If I did it
right.  Is it OK?


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From f879481f96386617d070b146aa2c3d1988deff40 Mon Sep 17 00:00:00 2001
From: Alex Kost <alezost@gmail.com>
Date: Sat, 25 Apr 2015 22:52:29 +0300
Subject: [PATCH] services: Add console-keymap service.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

* gnu/services/base.scm (console-keymap-service): New procedure.
* doc/guix.texi (Base Services): Document it.

Co-authored-by: 宋文武 <iyzsong@gmail.com>
---
 doc/guix.texi         |  5 +++++
 gnu/services/base.scm | 15 +++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/doc/guix.texi b/doc/guix.texi
index 4269d4f..c342ebc 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -4737,6 +4737,11 @@ passed to @command{guix-daemon}.
 Run @var{udev}, which populates the @file{/dev} directory dynamically.
 @end deffn
 
+@deffn {Monadic Procedure} console-keymap-service @var{file}
+Return a service to load console keymap from @var{file} using
+@command{loadkeys} command.
+@end deffn
+
 
 @node Networking Services
 @subsubsection Networking Services
diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index d0a2e8c..49eccda 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -1,5 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2015 Alex Kost <alezost@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -46,6 +47,7 @@
             swap-service
             user-processes-service
             host-name-service
+            console-keymap-service
             console-font-service
             udev-service
             mingetty-service
@@ -313,6 +315,19 @@ stopped before 'kill' is called."
           (else
            (zero? (cdr (waitpid pid))))))))
 
+(define (console-keymap-service file)
+  "Return a service to load console keymap from @var{file}."
+  (with-monad %store-monad
+    (return
+     (service
+      (documentation
+       (string-append "Load '" file "' console keymap (loadkeys)."))
+      (provision '(console-keymap))
+      (start #~(lambda _
+                 (zero? (system* (string-append #$kbd "/bin/loadkeys")
+                                 #$file))))
+      (respawn? #f)))))
+
 (define* (console-font-service tty #:optional (font "LatGrkCyr-8x16"))
   "Return a service that sets up Unicode support in @var{tty} and loads
 @var{font} for that tty (fonts are per virtual console in Linux.)"
-- 
2.2.1