149 lines
4.2 KiB
Nix
149 lines
4.2 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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theme = pkgs.gnome3.gnome_themes_standard;
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icons = pkgs.gnome3.gnome_icon_theme;
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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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# This wrapper ensures that we actually get themes
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makeWrapper ${pkgs.lightdm_gtk_greeter}/sbin/lightdm-gtk-greeter \
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$out/greeter \
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--prefix PATH : "${pkgs.glibc}/bin" \
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--set GDK_PIXBUF_MODULE_FILE "$(find ${theme} -name loaders.cache)" \
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--set GTK_PATH "${theme}:${pkgs.gtk3}" \
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--set GTK_EXE_PREFIX "${theme}" \
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--set GTK_DATA_PREFIX "${theme}" \
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--set XDG_DATA_DIRS "${theme}/share:${icons}/share" \
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--set XDG_CONFIG_HOME "${theme}/share"
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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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usersConf = writeText "users.conf"
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''
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[UserList]
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minimum-uid=500
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hidden-users=${concatStringsSep " " dmcfg.hiddenUsers}
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hidden-shells=/run/current-system/sw/bin/nologin
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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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gtkGreeterConf = writeText "lightdm-gtk-greeter.conf"
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''
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[greeter]
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theme-name = Adwaita
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icon-theme-name = Adwaita
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background = ${cfg.background}
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'';
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in
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{
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options = {
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services.xserver.displayManager.lightdm = {
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enable = mkOption {
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default = false;
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description = ''
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Whether to enable lightdm as the display manager.
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'';
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};
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greeter = mkOption {
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description = ''
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The LightDM greeter to login via. The package should be a directory
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containing a .desktop file matching the name in the 'name' option.
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'';
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default = {
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name = "lightdm-gtk-greeter";
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package = wrappedGtkGreeter;
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};
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};
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background = mkOption {
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default = "${pkgs.nixos-artwork}/gnome/Gnome_Dark.png";
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description = ''
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The background image or color to use.
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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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exec ${lightdm}/sbin/lightdm --log-dir=/var/log --run-dir=/run
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'';
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};
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environment.etc."lightdm/lightdm-gtk-greeter.conf".source = gtkGreeterConf;
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environment.etc."lightdm/lightdm.conf".source = lightdmConf;
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environment.etc."lightdm/users.conf".source = usersConf;
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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-data";
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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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