8dc5ff7dcf
The upstream session files display managers use have no concept of sessions being composed from desktop manager and window manager. To be able to set upstream session files as default session, we need a single option. Having two different ways to set default session would be confusing, though, so we decided to deprecate the old method. We also created separate script for each session, just like we already had a separate desktop file for each one, and started using displayManager.sessionPackages mechanism to make the session handling more uniform.
346 lines
11 KiB
Nix
346 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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defaultSessionName = config.services.xserver.displayManager.defaultSession;
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setSessionScript = pkgs.callPackage ./account-service-util.nix { };
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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.sessionData.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 ${pulseConfig} /run/gdm/.config/pulse/default.pa
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chown -R gdm:gdm /run/gdm/.config
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'' + optionalString config.services.gnome3.gnome-initial-setup.enable ''
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# Create stamp file for gnome-initial-setup to prevent run.
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mkdir -p /run/gdm/.config
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cat - > /run/gdm/.config/gnome-initial-setup-done <<- EOF
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yes
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EOF
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'' + optionalString (defaultSessionName != null) ''
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# Set default session in session chooser to a specified values – basically ignore session history.
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${setSessionScript}/bin/set-session ${cfg.sessionData.autologinSession}
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'';
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};
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systemd.services.display-manager.wants = [
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# Because sd_login_monitor_new requires /run/systemd/machines
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"systemd-machined.service"
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# setSessionScript wants AccountsService
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"accounts-daemon.service"
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];
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systemd.services.display-manager.after = [
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"rc-local.service"
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"systemd-machined.service"
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"systemd-user-sessions.service"
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"getty@tty${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.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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${optionalString cfg.gdm.debug "Enable=true"}
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'';
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environment.etc."gdm/Xsession".source = config.services.xserver.displayManager.sessionData.wrapper;
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# GDM LFS PAM modules, adapted somehow to NixOS
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security.pam.services = {
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gdm-launch-environment.text = ''
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auth required pam_succeed_if.so audit quiet_success user = gdm
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auth optional pam_permit.so
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account required pam_succeed_if.so audit quiet_success user = gdm
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account sufficient pam_unix.so
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password required pam_deny.so
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session required pam_succeed_if.so audit quiet_success user = gdm
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session required pam_env.so conffile=${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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