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{ config, lib, pkgs, ... }:
with lib;
let
dmcfg = config.services.xserver.displayManager;
xEnv = config.systemd.services."display-manager".environment;
cfg = dmcfg.lightdm;
inherit (pkgs) stdenv lightdm writeScript writeText;
# lightdm runs with clearenv(), but we need a few things in the enviornment for X to startup
xserverWrapper = writeScript "xserver-wrapper"
''
#! /bin/sh
${concatMapStrings (n: "export ${n}=\"${getAttr n xEnv}\"\n") (attrNames xEnv)}
exec ${dmcfg.xserverBin} ${dmcfg.xserverArgs}
'';
theme = pkgs.gnome3.gnome_themes_standard;
icons = pkgs.gnome3.gnome_icon_theme;
# The default greeter provided with this expression is the GTK greeter.
# Again, we need a few things in the environment for the greeter to run with
# fonts/icons.
wrappedGtkGreeter = stdenv.mkDerivation {
name = "lightdm-gtk-greeter";
buildInputs = [ pkgs.makeWrapper ];
buildCommand = ''
# This wrapper ensures that we actually get themes
makeWrapper ${pkgs.lightdm_gtk_greeter}/sbin/lightdm-gtk-greeter \
$out/greeter \
--prefix PATH : "${pkgs.glibc}/bin" \
--set GDK_PIXBUF_MODULE_FILE "$(find ${theme} -name loaders.cache)" \
--set GTK_PATH "${theme}:${pkgs.gtk3}" \
--set GTK_EXE_PREFIX "${theme}" \
--set GTK_DATA_PREFIX "${theme}" \
--set XDG_DATA_DIRS "${theme}/share:${icons}/share" \
--set XDG_CONFIG_HOME "${theme}/share"
cat - > $out/lightdm-gtk-greeter.desktop << EOF
[Desktop Entry]
Name=LightDM Greeter
Comment=This runs the LightDM Greeter
Exec=$out/greeter
Type=Application
EOF
'';
};
usersConf = writeText "users.conf"
''
[UserList]
minimum-uid=500
hidden-users=${concatStringsSep " " dmcfg.hiddenUsers}
hidden-shells=/run/current-system/sw/bin/nologin
'';
lightdmConf = writeText "lightdm.conf"
''
[LightDM]
greeter-user = ${config.users.extraUsers.lightdm.name}
greeters-directory = ${cfg.greeter.package}
sessions-directory = ${dmcfg.session.desktops}
[SeatDefaults]
xserver-command = ${xserverWrapper}
session-wrapper = ${dmcfg.session.script}
greeter-session = ${cfg.greeter.name}
'';
gtkGreeterConf = writeText "lightdm-gtk-greeter.conf"
''
[greeter]
theme-name = Adwaita
icon-theme-name = Adwaita
background = ${cfg.background}
'';
in
{
options = {
services.xserver.displayManager.lightdm = {
enable = mkOption {
default = false;
description = ''
Whether to enable lightdm as the display manager.
'';
};
greeter = mkOption {
description = ''
The LightDM greeter to login via. The package should be a directory
containing a .desktop file matching the name in the 'name' option.
'';
default = {
name = "lightdm-gtk-greeter";
package = wrappedGtkGreeter;
};
};
background = mkOption {
default = "${pkgs.nixos-artwork}/gnome/Gnome_Dark.png";
description = ''
The background image or color to use.
'';
};
};
};
config = mkIf cfg.enable {
services.xserver.displayManager.slim.enable = false;
services.xserver.displayManager.job = {
logsXsession = true;
# lightdm relaunches itself via just `lightdm`, so needs to be on the PATH
execCmd = ''
export PATH=${lightdm}/sbin:$PATH
exec ${lightdm}/sbin/lightdm --log-dir=/var/log --run-dir=/run
'';
};
environment.etc."lightdm/lightdm-gtk-greeter.conf".source = gtkGreeterConf;
environment.etc."lightdm/lightdm.conf".source = lightdmConf;
environment.etc."lightdm/users.conf".source = usersConf;
services.dbus.enable = true;
services.dbus.packages = [ lightdm ];
security.pam.services.lightdm = { allowNullPassword = true; startSession = true; };
security.pam.services.lightdm-greeter = { allowNullPassword = true; startSession = true; };
users.extraUsers.lightdm = {
createHome = true;
home = "/var/lib/lightdm-data";
group = "lightdm";
uid = config.ids.uids.lightdm;
};
users.extraGroups.lightdm.gid = config.ids.gids.lightdm;
};
}
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