nixpkgs/nixos/modules/tasks/kbd.nix

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{ config, lib, pkgs, ... }:
with lib;
let
makeColor = n: value: "COLOR_${toString n}=${value}";
makeColorCS =
let positions = [ "0" "1" "2" "3" "4" "5" "6" "7" "8" "9" "A" "B" "C" "D" "E" "F" ];
in n: value: "\033]P${elemAt position n}${value}";
colors = concatImapStringsSep "\n" makeColor config.i18n.consoleColors;
isUnicode = hasSuffix "UTF-8" (toUpper config.i18n.defaultLocale);
optimizedKeymap = pkgs.runCommand "keymap" {
nativeBuildInputs = [ pkgs.kbd ];
} ''
cd ${kbdEnv}/share/keymaps
loadkeys -b ${optionalString isUnicode "-u"} "${config.i18n.consoleKeyMap}" > $out
'';
# Sadly, systemd-vconsole-setup doesn't support binary keymaps.
vconsoleConf = pkgs.writeText "vconsole.conf" ''
KEYMAP=${config.i18n.consoleKeyMap}
FONT=${config.i18n.consoleFont}
${colors}
'';
kbdEnv = pkgs.buildEnv {
name = "kbd-env";
paths = [ pkgs.kbd ] ++ config.i18n.consolePackages;
pathsToLink = [ "/share/consolefonts" "/share/consoletrans" "/share/keymaps" "/share/unimaps" ];
};
setVconsole = !config.boot.isContainer;
in
{
###### interface
options = {
# most options are defined in i18n.nix
# FIXME: still needed?
boot.extraTTYs = mkOption {
default = [];
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type = types.listOf types.str;
example = ["tty8" "tty9"];
description = ''
Tty (virtual console) devices, in addition to the consoles on
which mingetty and syslogd run, that must be initialised.
Only useful if you have some program that you want to run on
some fixed console. For example, the NixOS installation CD
opens the manual in a web browser on console 7, so it sets
<option>boot.extraTTYs</option> to <literal>["tty7"]</literal>.
'';
};
boot.earlyVconsoleSetup = mkOption {
default = false;
type = types.bool;
description = ''
Enable setting font and keymap as early as possible (in initrd).
'';
};
};
###### implementation
config = mkMerge [
(mkIf (!setVconsole || (setVconsole && config.boot.earlyVconsoleSetup)) {
systemd.services."systemd-vconsole-setup".enable = false;
})
(mkIf setVconsole (mkMerge [
{ environment.systemPackages = [ pkgs.kbd ];
# Let systemd-vconsole-setup.service do the work of setting up the
# virtual consoles.
environment.etc."vconsole.conf".source = vconsoleConf;
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# Provide kbd with additional packages.
environment.etc."kbd".source = "${kbdEnv}/share";
}
(mkIf (!config.boot.earlyVconsoleSetup) {
# This is identical to the systemd-vconsole-setup.service unit
# shipped with systemd, except that it uses /dev/tty1 instead of
# /dev/tty0 to prevent putting the X server in non-raw mode, and
# it has a restart trigger.
systemd.services."systemd-vconsole-setup" =
{ wantedBy = [ "sysinit.target" ];
before = [ "display-manager.service" ];
after = [ "systemd-udev-settle.service" ];
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restartTriggers = [ vconsoleConf kbdEnv ];
};
})
(mkIf config.boot.earlyVconsoleSetup {
boot.initrd.extraUtilsCommands = ''
mkdir -p $out/share/consolefonts
${if substring 0 1 config.i18n.consoleFont == "/" then ''
font="${config.i18n.consoleFont}"
'' else ''
font="$(echo ${kbdEnv}/share/consolefonts/${config.i18n.consoleFont}.*)"
''}
if [[ $font == *.gz ]]; then
gzip -cd $font > $out/share/consolefonts/font.psf
else
cp -L $font $out/share/consolefonts/font.psf
fi
'';
boot.initrd.preLVMCommands = mkBefore ''
kbd_mode ${if isUnicode then "-u" else "-a"} -C /dev/console
printf "\033%%${if isUnicode then "G" else "@"}" >> /dev/console
loadkmap < ${optimizedKeymap}
setfont -C /dev/console $extraUtils/share/consolefonts/font.psf
${concatImapStringsSep "\n" (n: color: ''
printf "${makeColorCS n color}" >> /dev/console
'') config.i18n.consoleColors}
'';
})
]))
];
}