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{ config, pkgs, lib, ... }:
let
inherit (lib) mapAttrs mkIf mkOption optional optionals types;
cfg = config.services.kmscon;
autologinArg = lib.optionalString (cfg.autologinUser != null) "-f ${cfg.autologinUser}";
configDir = pkgs.writeTextFile { name = "kmscon-config"; destination = "/kmscon.conf"; text = cfg.extraConfig; };
in {
options = {
services.kmscon = {
enable = mkOption {
description = lib.mdDoc ''
Use kmscon as the virtual console instead of gettys.
kmscon is a kms/dri-based userspace virtual terminal implementation.
It supports a richer feature set than the standard linux console VT,
including full unicode support, and when the video card supports drm
should be much faster.
'';
type = types.bool;
default = false;
};
hwRender = mkOption {
description = lib.mdDoc "Whether to use 3D hardware acceleration to render the console.";
type = types.bool;
default = false;
};
fonts = mkOption {
description = lib.mdDoc "Fonts used by kmscon, in order of priority.";
default = null;
example = lib.literalExpression ''[ { name = "Source Code Pro"; package = pkgs.source-code-pro; } ]'';
type = with types;
let fontType = submodule {
options = {
name = mkOption { type = str; description = lib.mdDoc "Font name, as used by fontconfig."; };
package = mkOption { type = package; description = lib.mdDoc "Package providing the font."; };
};
}; in nullOr (nonEmptyListOf fontType);
};
extraConfig = mkOption {
description = lib.mdDoc "Extra contents of the kmscon.conf file.";
type = types.lines;
default = "";
example = "font-size=14";
};
extraOptions = mkOption {
description = lib.mdDoc "Extra flags to pass to kmscon.";
type = types.separatedString " ";
default = "";
example = "--term xterm-256color";
};
autologinUser = mkOption {
type = types.nullOr types.str;
default = null;
description = lib.mdDoc ''
Username of the account that will be automatically logged in at the console.
If unspecified, a login prompt is shown as usual.
'';
};
};
};
config = mkIf cfg.enable {
# Largely copied from unit provided with kmscon source
systemd.units."kmsconvt@.service".text = ''
[Unit]
Description=KMS System Console on %I
Documentation=man:kmscon(1)
After=systemd-user-sessions.service
After=plymouth-quit-wait.service
After=systemd-logind.service
After=systemd-vconsole-setup.service
Requires=systemd-logind.service
Before=getty.target
Conflicts=getty@%i.service
OnFailure=getty@%i.service
IgnoreOnIsolate=yes
ConditionPathExists=/dev/tty0
[Service]
ExecStart=
ExecStart=${pkgs.kmscon}/bin/kmscon "--vt=%I" ${cfg.extraOptions} --seats=seat0 --no-switchvt --configdir ${configDir} --login -- ${pkgs.shadow}/bin/login -p ${autologinArg}
UtmpIdentifier=%I
TTYPath=/dev/%I
TTYReset=yes
TTYVHangup=yes
TTYVTDisallocate=yes
X-RestartIfChanged=false
'';
systemd.suppressedSystemUnits = [ "autovt@.service" ];
systemd.units."kmsconvt@.service".aliases = [ "autovt@.service" ];
systemd.services.systemd-vconsole-setup.enable = false;
services.kmscon.extraConfig =
let
render = optionals cfg.hwRender [ "drm" "hwaccel" ];
fonts = optional (cfg.fonts != null) "font-name=${lib.concatMapStringsSep ", " (f: f.name) cfg.fonts}";
in lib.concatStringsSep "\n" (render ++ fonts);
hardware.opengl.enable = mkIf cfg.hwRender true;
fonts = mkIf (cfg.fonts != null) {
fontconfig.enable = true;
fonts = map (f: f.package) cfg.fonts;
};
};
}
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