7658c90f21
Previously, if you, for example, set
services.xserver.displayManager.sddm.enable, but forgot to set
services.xserver.enable, you would get an error message that looked like
this:
error: attribute 'display-manager' missing
Which was not particularly helpful.
Using assertions, we can make this message much better.
300 lines
8.5 KiB
Nix
300 lines
8.5 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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xcfg = config.services.xserver;
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dmcfg = xcfg.displayManager;
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cfg = dmcfg.sddm;
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xEnv = config.systemd.services."display-manager".environment;
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inherit (pkgs) sddm;
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xserverWrapper = pkgs.writeScript "xserver-wrapper" ''
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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 systemd-cat ${dmcfg.xserverBin} ${toString dmcfg.xserverArgs} "$@"
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'';
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Xsetup = pkgs.writeScript "Xsetup" ''
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#!/bin/sh
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${cfg.setupScript}
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${dmcfg.setupCommands}
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'';
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Xstop = pkgs.writeScript "Xstop" ''
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#!/bin/sh
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${cfg.stopScript}
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'';
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cfgFile = pkgs.writeText "sddm.conf" ''
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[General]
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HaltCommand=${pkgs.systemd}/bin/systemctl poweroff
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RebootCommand=${pkgs.systemd}/bin/systemctl reboot
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${optionalString cfg.autoNumlock ''
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Numlock=on
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''}
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[Theme]
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Current=${cfg.theme}
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ThemeDir=/run/current-system/sw/share/sddm/themes
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FacesDir=/run/current-system/sw/share/sddm/faces
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[Users]
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MaximumUid=${toString config.ids.uids.nixbld}
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HideUsers=${concatStringsSep "," dmcfg.hiddenUsers}
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HideShells=/run/current-system/sw/bin/nologin
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[X11]
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MinimumVT=${toString (if xcfg.tty != null then xcfg.tty else 7)}
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ServerPath=${xserverWrapper}
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XephyrPath=${pkgs.xorg.xorgserver.out}/bin/Xephyr
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SessionCommand=${dmcfg.session.wrapper}
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SessionDir=${dmcfg.session.desktops}/share/xsessions
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XauthPath=${pkgs.xorg.xauth}/bin/xauth
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DisplayCommand=${Xsetup}
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DisplayStopCommand=${Xstop}
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EnableHidpi=${if cfg.enableHidpi then "true" else "false"}
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[Wayland]
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EnableHidpi=${if cfg.enableHidpi then "true" else "false"}
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SessionDir=${dmcfg.session.desktops}/share/wayland-sessions
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${optionalString cfg.autoLogin.enable ''
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[Autologin]
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User=${cfg.autoLogin.user}
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Session=${defaultSessionName}.desktop
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Relogin=${boolToString cfg.autoLogin.relogin}
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''}
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${cfg.extraConfig}
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'';
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defaultSessionName =
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let
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dm = xcfg.desktopManager.default;
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wm = xcfg.windowManager.default;
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in dm + optionalString (wm != "none") ("+" + wm);
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in
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{
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options = {
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services.xserver.displayManager.sddm = {
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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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Whether to enable sddm as the display manager.
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'';
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};
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enableHidpi = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to enable automatic HiDPI mode.
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</para>
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<para>
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Versions up to 0.17 are broken so this only works from 0.18 onwards.
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'';
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};
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extraConfig = mkOption {
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type = types.lines;
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default = "";
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example = ''
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[Autologin]
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User=john
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Session=plasma.desktop
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'';
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description = ''
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Extra lines appended to the configuration of SDDM.
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'';
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};
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theme = mkOption {
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type = types.str;
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default = "";
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description = ''
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Greeter theme to use.
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'';
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};
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autoNumlock = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Enable numlock at login.
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'';
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};
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setupScript = mkOption {
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type = types.str;
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default = "";
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example = ''
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# workaround for using NVIDIA Optimus without Bumblebee
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xrandr --setprovideroutputsource modesetting NVIDIA-0
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xrandr --auto
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'';
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description = ''
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A script to execute when starting the display server. DEPRECATED, please
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use <option>services.xserver.displayManager.setupCommands</option>.
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'';
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};
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stopScript = mkOption {
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type = types.str;
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default = "";
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description = ''
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A script to execute when stopping the display server.
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'';
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};
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autoLogin = mkOption {
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default = {};
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description = ''
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Configuration for automatic login.
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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 <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 automatic login.
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'';
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};
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relogin = mkOption {
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type = types.bool;
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default = false;
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description = ''
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If true automatic login will kick in again on session exit (logout), otherwise it
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will only log in automatically when the display-manager is started.
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'';
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};
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};
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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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assertions = [
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{ assertion = xcfg.enable;
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message = ''
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SDDM requires services.xserver.enable to be true
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'';
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}
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{ assertion = cfg.autoLogin.enable -> cfg.autoLogin.user != null;
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message = ''
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SDDM auto-login requires services.xserver.displayManager.sddm.autoLogin.user to be set
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'';
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}
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{ assertion = cfg.autoLogin.enable -> elem defaultSessionName dmcfg.session.names;
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message = ''
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SDDM auto-login requires that services.xserver.desktopManager.default and
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services.xserver.windowManager.default are set to valid values. The current
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default session: ${defaultSessionName} is not valid.
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'';
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}
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];
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services.xserver.displayManager.job = {
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environment = {
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# Load themes from system environment
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QT_PLUGIN_PATH = "/run/current-system/sw/" + pkgs.qt5.qtbase.qtPluginPrefix;
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QML2_IMPORT_PATH = "/run/current-system/sw/" + pkgs.qt5.qtbase.qtQmlPrefix;
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XDG_DATA_DIRS = "/run/current-system/sw/share";
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};
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execCmd = "exec /run/current-system/sw/bin/sddm";
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};
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security.pam.services = {
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sddm = {
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allowNullPassword = true;
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startSession = true;
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};
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sddm-greeter.text = ''
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auth required pam_succeed_if.so audit quiet_success user = sddm
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auth optional pam_permit.so
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account required pam_succeed_if.so audit quiet_success user = sddm
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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 = sddm
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session required pam_env.so envfile=${config.system.build.pamEnvironment}
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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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sddm-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 include sddm
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password include sddm
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session include sddm
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'';
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};
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users.users.sddm = {
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createHome = true;
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home = "/var/lib/sddm";
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group = "sddm";
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uid = config.ids.uids.sddm;
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};
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environment.etc."sddm.conf".source = cfgFile;
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environment.pathsToLink = [
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"/share/sddm"
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];
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users.groups.sddm.gid = config.ids.gids.sddm;
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environment.systemPackages = [ sddm ];
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services.dbus.packages = [ sddm ];
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# To enable user switching, allow sddm to allocate TTYs/displays dynamically.
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services.xserver.tty = null;
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services.xserver.display = null;
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systemd.tmpfiles.rules = [
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# Prior to Qt 5.9.2, there is a QML cache invalidation bug which sometimes
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# strikes new Plasma 5 releases. If the QML cache is not invalidated, SDDM
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# will segfault without explanation. We really tore our hair out for awhile
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# before finding the bug:
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# https://bugreports.qt.io/browse/QTBUG-62302
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# We work around the problem by deleting the QML cache before startup.
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# This was supposedly fixed in Qt 5.9.2 however it has been reported with
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# 5.10 and 5.11 as well. The initial workaround was to delete the directory
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# in the Xsetup script but that doesn't do anything.
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# Instead we use tmpfiles.d to ensure it gets wiped.
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# This causes a small but perceptible delay when SDDM starts.
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"e ${config.users.users.sddm.home}/.cache - - - 0"
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];
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};
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}
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