375 lines
11 KiB
Nix
375 lines
11 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.xserver.displayManager;
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gdm = pkgs.gnome3.gdm;
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xSessionWrapper = if (cfg.setupCommands == "") then null else
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pkgs.writeScript "gdm-x-session-wrapper" ''
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#!${pkgs.bash}/bin/bash
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${cfg.setupCommands}
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exec "$@"
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'';
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# Solves problems like:
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# https://wiki.archlinux.org/index.php/Talk:Bluetooth_headset#GDMs_pulseaudio_instance_captures_bluetooth_headset
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# Instead of blacklisting plugins, we use Fedora's PulseAudio configuration for GDM:
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# https://src.fedoraproject.org/rpms/gdm/blob/master/f/default.pa-for-gdm
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pulseConfig = pkgs.writeText "default.pa" ''
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load-module module-device-restore
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load-module module-card-restore
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load-module module-udev-detect
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load-module module-native-protocol-unix
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load-module module-default-device-restore
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load-module module-rescue-streams
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load-module module-always-sink
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load-module module-intended-roles
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load-module module-suspend-on-idle
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load-module module-position-event-sounds
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'';
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dmDefault = config.services.xserver.desktopManager.default;
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wmDefault = config.services.xserver.windowManager.default;
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hasDefaultUserSession = dmDefault != "none" || wmDefault != "none";
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defaultSessionName = dmDefault + optionalString (wmDefault != "none") ("+" + wmDefault);
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setSessionScript = pkgs.python3.pkgs.buildPythonApplication {
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name = "set-session";
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format = "other";
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src = ./set-session.py;
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dontUnpack = true;
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strictDeps = false;
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nativeBuildInputs = with pkgs; [
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wrapGAppsHook
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gobject-introspection
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];
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buildInputs = with pkgs; [
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accountsservice
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glib
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];
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propagatedBuildInputs = with pkgs.python3.pkgs; [
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pygobject3
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ordered-set
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];
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installPhase = ''
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mkdir -p $out/bin
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cp $src $out/bin/set-session
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chmod +x $out/bin/set-session
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'';
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};
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in
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{
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###### interface
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options = {
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services.xserver.displayManager.gdm = {
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enable = mkEnableOption ''
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GDM, the GNOME Display Manager
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'';
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debug = mkEnableOption ''
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debugging messages in GDM
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'';
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autoLogin = mkOption {
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default = {};
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description = ''
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Auto login configuration attrset.
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'';
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type = types.submodule {
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options = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Automatically log in as the sepecified <option>autoLogin.user</option>.
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'';
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};
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user = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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User to be used for the autologin.
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'';
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};
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delay = mkOption {
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type = types.int;
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default = 0;
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description = ''
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Seconds of inactivity after which the autologin will be performed.
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'';
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};
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};
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};
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};
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wayland = mkOption {
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default = true;
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description = ''
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Allow GDM to run on Wayland instead of Xserver.
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Note to enable Wayland with Nvidia you need to
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enable the <option>nvidiaWayland</option>.
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'';
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type = types.bool;
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};
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nvidiaWayland = mkOption {
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default = false;
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description = ''
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Whether to allow wayland to be used with the proprietary
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NVidia graphics driver.
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'';
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};
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autoSuspend = mkOption {
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default = true;
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description = ''
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Suspend the machine after inactivity.
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'';
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type = types.bool;
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};
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};
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};
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###### implementation
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config = mkIf cfg.gdm.enable {
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assertions = [
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{ assertion = cfg.gdm.autoLogin.enable -> cfg.gdm.autoLogin.user != null;
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message = "GDM auto-login requires services.xserver.displayManager.gdm.autoLogin.user to be set";
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}
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];
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services.xserver.displayManager.lightdm.enable = false;
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users.users.gdm =
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{ name = "gdm";
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uid = config.ids.uids.gdm;
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group = "gdm";
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home = "/run/gdm";
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description = "GDM user";
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};
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users.groups.gdm.gid = config.ids.gids.gdm;
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# GDM needs different xserverArgs, presumable because using wayland by default.
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services.xserver.tty = null;
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services.xserver.display = null;
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services.xserver.verbose = null;
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services.xserver.displayManager.job =
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{
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environment = {
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GDM_X_SERVER_EXTRA_ARGS = toString
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(filter (arg: arg != "-terminate") cfg.xserverArgs);
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XDG_DATA_DIRS = "${cfg.session.desktops}/share/";
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} // optionalAttrs (xSessionWrapper != null) {
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# Make GDM use this wrapper before running the session, which runs the
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# configured setupCommands. This relies on a patched GDM which supports
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# this environment variable.
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GDM_X_SESSION_WRAPPER = "${xSessionWrapper}";
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};
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execCmd = "exec ${gdm}/bin/gdm";
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preStart = optionalString config.hardware.pulseaudio.enable ''
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mkdir -p /run/gdm/.config/pulse
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ln -sf ${pulseConfig} /run/gdm/.config/pulse/default.pa
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chown -R gdm:gdm /run/gdm/.config
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'' + optionalString config.services.gnome3.gnome-initial-setup.enable ''
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# Create stamp file for gnome-initial-setup to prevent run.
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mkdir -p /run/gdm/.config
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cat - > /run/gdm/.config/gnome-initial-setup-done <<- EOF
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yes
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EOF
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'' + optionalString hasDefaultUserSession ''
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${setSessionScript}/bin/set-session ${defaultSessionName}
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'';
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};
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# Because sd_login_monitor_new requires /run/systemd/machines
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systemd.services.display-manager.wants = [ "systemd-machined.service" ];
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systemd.services.display-manager.after = [
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"rc-local.service"
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"systemd-machined.service"
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"systemd-user-sessions.service"
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"getty@tty${gdm.initialVT}.service"
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"plymouth-quit.service"
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"plymouth-start.service"
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];
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systemd.services.display-manager.conflicts = [
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"getty@tty${gdm.initialVT}.service"
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# TODO: Add "plymouth-quit.service" so GDM can control when plymouth quits.
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# Currently this breaks switching configurations while using plymouth.
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];
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systemd.services.display-manager.onFailure = [
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"plymouth-quit.service"
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];
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systemd.services.display-manager.serviceConfig = {
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# Restart = "always"; - already defined in xserver.nix
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KillMode = "mixed";
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IgnoreSIGPIPE = "no";
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BusName = "org.gnome.DisplayManager";
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StandardOutput = "syslog";
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StandardError = "inherit";
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ExecReload = "${pkgs.coreutils}/bin/kill -SIGHUP $MAINPID";
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KeyringMode = "shared";
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EnvironmentFile = "-/etc/locale.conf";
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};
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systemd.services.display-manager.path = [ pkgs.gnome3.gnome-session ];
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# Allow choosing an user account
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services.accounts-daemon.enable = true;
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services.dbus.packages = [ gdm ];
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# We duplicate upstream's udev rules manually to make wayland with nvidia configurable
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services.udev.extraRules = ''
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# disable Wayland on Cirrus chipsets
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ATTR{vendor}=="0x1013", ATTR{device}=="0x00b8", ATTR{subsystem_vendor}=="0x1af4", ATTR{subsystem_device}=="0x1100", RUN+="${gdm}/libexec/gdm-disable-wayland"
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# disable Wayland on Hi1710 chipsets
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ATTR{vendor}=="0x19e5", ATTR{device}=="0x1711", RUN+="${gdm}/libexec/gdm-disable-wayland"
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${optionalString (!cfg.gdm.nvidiaWayland) ''
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DRIVER=="nvidia", RUN+="${gdm}/libexec/gdm-disable-wayland"
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''}
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# disable Wayland when modesetting is disabled
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IMPORT{cmdline}="nomodeset", RUN+="${gdm}/libexec/gdm-disable-wayland"
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'';
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systemd.user.services.dbus.wantedBy = [ "default.target" ];
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programs.dconf.profiles.gdm =
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let
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customDconf = pkgs.writeTextFile {
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name = "gdm-dconf";
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destination = "/dconf/gdm-custom";
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text = ''
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${optionalString (!cfg.gdm.autoSuspend) ''
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[org/gnome/settings-daemon/plugins/power]
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sleep-inactive-ac-type='nothing'
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sleep-inactive-battery-type='nothing'
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sleep-inactive-ac-timeout=0
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sleep-inactive-battery-timeout=0
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''}
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'';
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};
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customDconfDb = pkgs.stdenv.mkDerivation {
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name = "gdm-dconf-db";
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buildCommand = ''
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${pkgs.gnome3.dconf}/bin/dconf compile $out ${customDconf}/dconf
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'';
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};
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in pkgs.stdenv.mkDerivation {
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name = "dconf-gdm-profile";
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buildCommand = ''
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# Check that the GDM profile starts with what we expect.
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if [ $(head -n 1 ${gdm}/share/dconf/profile/gdm) != "user-db:user" ]; then
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echo "GDM dconf profile changed, please update gdm.nix"
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exit 1
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fi
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# Insert our custom DB behind it.
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sed '2ifile-db:${customDconfDb}' ${gdm}/share/dconf/profile/gdm > $out
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'';
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};
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# Use AutomaticLogin if delay is zero, because it's immediate.
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# Otherwise with TimedLogin with zero seconds the prompt is still
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# presented and there's a little delay.
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environment.etc."gdm/custom.conf".text = ''
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[daemon]
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WaylandEnable=${if cfg.gdm.wayland then "true" else "false"}
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${optionalString cfg.gdm.autoLogin.enable (
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if cfg.gdm.autoLogin.delay > 0 then ''
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TimedLoginEnable=true
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TimedLogin=${cfg.gdm.autoLogin.user}
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TimedLoginDelay=${toString cfg.gdm.autoLogin.delay}
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'' else ''
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AutomaticLoginEnable=true
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AutomaticLogin=${cfg.gdm.autoLogin.user}
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'')
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}
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[security]
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[xdmcp]
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[greeter]
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[chooser]
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[debug]
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${optionalString cfg.gdm.debug "Enable=true"}
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'';
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environment.etc."gdm/Xsession".source = config.services.xserver.displayManager.session.wrapper;
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# GDM LFS PAM modules, adapted somehow to NixOS
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security.pam.services = {
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gdm-launch-environment.text = ''
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auth required pam_succeed_if.so audit quiet_success user = gdm
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auth optional pam_permit.so
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account required pam_succeed_if.so audit quiet_success user = gdm
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account sufficient pam_unix.so
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password required pam_deny.so
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session required pam_succeed_if.so audit quiet_success user = gdm
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session required pam_env.so conffile=${config.system.build.pamEnvironment} readenv=0
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session optional ${pkgs.systemd}/lib/security/pam_systemd.so
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session optional pam_keyinit.so force revoke
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session optional pam_permit.so
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'';
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gdm-password.text = ''
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auth substack login
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account include login
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password substack login
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session include login
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'';
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gdm-autologin.text = ''
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auth requisite pam_nologin.so
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auth required pam_succeed_if.so uid >= 1000 quiet
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auth required pam_permit.so
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account sufficient pam_unix.so
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password requisite pam_unix.so nullok sha512
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session optional pam_keyinit.so revoke
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session include login
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'';
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};
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};
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}
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