nixpkgs/modules/tasks/kbd.nix

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{ config, pkgs, ... }:
with pkgs.lib;
let
# think about where to put this chunk of code!
# required by other pieces as well
requiredTTYs = config.services.mingetty.ttys
++ config.boot.extraTTYs
++ [ config.services.syslogd.tty ];
ttys = map (dev: "/dev/${dev}") requiredTTYs;
defaultLocale = config.i18n.defaultLocale;
consoleFont = config.i18n.consoleFont;
consoleKeyMap = config.i18n.consoleKeyMap;
in
{
###### interface
options = {
# most options are defined in i18n.nix
boot.extraTTYs = mkOption {
default = [];
example = ["tty8" "tty9"];
description = ''
Tty (virtual console) devices, in addition to the consoles on
which mingetty and syslogd run, that must be initialised.
Only useful if you have some program that you want to run on
some fixed console. For example, the NixOS installation CD
opens the manual in a web browser on console 7, so it sets
<option>boot.extraTTYs</option> to <literal>["tty7"]</literal>.
'';
};
# dummy option so that requiredTTYs can be passed
requiredTTYs = mkOption {
default = [];
description = "
FIXME: find another place for this option.
FIXME: find a good description.
";
};
};
###### implementation
config = {
inherit requiredTTYs; # pass it to ./modules/tasks/tty-backgrounds.nix
environment.systemPackages = [pkgs.kbd];
jobs.kbd =
{ description = "Keyboard / console initialisation";
startOn = "started udev";
task = true;
script = ''
export LANG=${defaultLocale}
export LOCALE_ARCHIVE=/run/current-system/sw/lib/locale/locale-archive
export PATH=${pkgs.gzip}/bin:$PATH # Needed by setfont
set +e # continue in case of errors
# Enable or disable UTF-8 mode. This is based on
# unicode_{start,stop}.
echo 'Enabling or disabling Unicode mode...'
charMap=$(${pkgs.glibc}/bin/locale charmap)
if test "$charMap" = UTF-8; then
for tty in ${toString ttys}; do
# Tell the console output driver that the bytes arriving are
# UTF-8 encoded multibyte sequences.
echo -n -e '\033%G' > $tty
done
# Set the keyboard driver in UTF-8 mode.
# !!! Commented out because it running this while the X
# server is running kicks the X server out of raw mode.
# UTF-8 mode is the default nowadays anyway.
# ${pkgs.kbd}/bin/kbd_mode -u
else
for tty in ${toString ttys}; do
# Tell the console output driver that the bytes arriving are
# UTF-8 encoded multibyte sequences.
echo -n -e '\033%@' > $tty
done
# Set the keyboard driver in ASCII (or any 8-bit character
# set) mode.
${pkgs.kbd}/bin/kbd_mode -a
fi
# Set the console font.
for tty in ${toString ttys}; do
${pkgs.kbd}/bin/setfont -C $tty ${consoleFont}
done
# Set the keymap.
${pkgs.kbd}/bin/loadkeys '${consoleKeyMap}'
'';
};
};
}