120 lines
3.4 KiB
Nix
120 lines
3.4 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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dmcfg = config.services.xserver.displayManager;
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xEnv = config.systemd.services."display-manager".environment;
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cfg = dmcfg.lightdm;
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inherit (pkgs) stdenv lightdm writeScript writeText;
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# lightdm runs with clearenv(), but we need a few things in the enviornment for X to startup
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xserverWrapper = writeScript "xserver-wrapper"
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''
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#! /bin/sh
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${concatMapStrings (n: "export ${n}=\"${getAttr n xEnv}\"\n") (attrNames xEnv)}
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exec ${dmcfg.xserverBin} ${dmcfg.xserverArgs}
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'';
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# The default greeter provided with this expression is the GTK greeter.
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# Again, we need a few things in the environment for the greeter to run with
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# fonts/icons.
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wrappedGtkGreeter = stdenv.mkDerivation {
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name = "lightdm-gtk-greeter";
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buildInputs = [ pkgs.makeWrapper ];
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buildCommand = ''
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mkdir -p $out/gtk-3.0/
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# This wrapper ensures that we actually get fonts
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makeWrapper ${pkgs.lightdm_gtk_greeter}/sbin/lightdm-gtk-greeter \
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$out/greeter \
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--set XDG_DATA_DIRS ${pkgs.gnome2.gnome_icon_theme}/share \
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--set FONTCONFIG_FILE /etc/fonts/fonts.conf \
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--set XDG_CONFIG_HOME $out/
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# We need this to ensure that it actually tries to find icons from gnome-icon-theme
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cat - > $out/gtk-3.0/settings.ini << EOF
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[Settings]
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gtk-icon-theme-name=gnome
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EOF
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cat - > $out/lightdm-gtk-greeter.desktop << EOF
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[Desktop Entry]
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Name=LightDM Greeter
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Comment=This runs the LightDM Greeter
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Exec=$out/greeter
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Type=Application
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EOF
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'';
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};
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lightdmConf = writeText "lightdm.conf"
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''
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[LightDM]
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greeter-user = ${config.users.extraUsers.lightdm.name}
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greeters-directory = ${cfg.greeter.package}
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sessions-directory = ${dmcfg.session.desktops}
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[SeatDefaults]
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xserver-command = ${xserverWrapper}
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session-wrapper = ${dmcfg.session.script}
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greeter-session = ${cfg.greeter.name}
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'';
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in
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{
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options = {
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services.xserver.displayManager.lightdm = {
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enable = mkOption {
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default = false;
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description = ''
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Whether to enable lightdm as the display manager.
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'';
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};
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greeter = mkOption {
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description = ''
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The LightDM greeter to login via. The package should be a directory
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containing a .desktop file matching the name in the 'name' option.
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'';
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default = {
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name = "lightdm-gtk-greeter";
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package = wrappedGtkGreeter;
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};
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};
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};
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};
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config = mkIf cfg.enable {
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services.xserver.displayManager.slim.enable = false;
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services.xserver.displayManager.job = {
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logsXsession = true;
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# lightdm relaunches itself via just `lightdm`, so needs to be on the PATH
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execCmd = ''
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export PATH=${lightdm}/sbin:$PATH
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${lightdm}/sbin/lightdm --log-dir=/var/log --run-dir=/run --config=${lightdmConf}
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'';
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};
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services.dbus.enable = true;
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services.dbus.packages = [ lightdm ];
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security.pam.services.lightdm = { allowNullPassword = true; startSession = true; };
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security.pam.services.lightdm-greeter = { allowNullPassword = true; startSession = true; };
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users.extraUsers.lightdm = {
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createHome = true;
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home = "/var/lib/lightdm";
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group = "lightdm";
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uid = config.ids.uids.lightdm;
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};
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users.extraGroups.lightdm.gid = config.ids.gids.lightdm;
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};
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}
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