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.
286 lines
8.6 KiB
Nix
286 lines
8.6 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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xEnv = config.systemd.services."display-manager".environment;
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cfg = dmcfg.lightdm;
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dmDefault = xcfg.desktopManager.default;
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wmDefault = xcfg.windowManager.default;
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hasDefaultUserSession = dmDefault != "none" || wmDefault != "none";
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inherit (pkgs) lightdm writeScript writeText;
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# lightdm runs with clearenv(), but we need a few things in the environment for X to startup
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xserverWrapper = writeScript "xserver-wrapper"
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''
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#! ${pkgs.bash}/bin/bash
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${concatMapStrings (n: "export ${n}=\"${getAttr n xEnv}\"\n") (attrNames xEnv)}
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display=$(echo "$@" | xargs -n 1 | grep -P ^:\\d\$ | head -n 1 | sed s/^://)
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if [ -z "$display" ]
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then additionalArgs=":0 -logfile /var/log/X.0.log"
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else additionalArgs="-logfile /var/log/X.$display.log"
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fi
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exec ${dmcfg.xserverBin} ${toString dmcfg.xserverArgs} $additionalArgs "$@"
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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=${concatStringsSep " " dmcfg.hiddenUsers}
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hidden-shells=/run/current-system/sw/bin/nologin
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'';
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lightdmConf = writeText "lightdm.conf"
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''
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[LightDM]
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${optionalString cfg.greeter.enable ''
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greeter-user = ${config.users.users.lightdm.name}
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greeters-directory = ${cfg.greeter.package}
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''}
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sessions-directory = ${dmcfg.session.desktops}/share/xsessions
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${cfg.extraConfig}
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[Seat:*]
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xserver-command = ${xserverWrapper}
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session-wrapper = ${dmcfg.session.wrapper}
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${optionalString cfg.greeter.enable ''
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greeter-session = ${cfg.greeter.name}
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''}
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${optionalString cfg.autoLogin.enable ''
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autologin-user = ${cfg.autoLogin.user}
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autologin-user-timeout = ${toString cfg.autoLogin.timeout}
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autologin-session = ${defaultSessionName}
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''}
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${optionalString hasDefaultUserSession ''
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user-session=${defaultSessionName}
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''}
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${optionalString (dmcfg.setupCommands != "") ''
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display-setup-script=${pkgs.writeScript "lightdm-display-setup" ''
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#!${pkgs.bash}/bin/bash
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${dmcfg.setupCommands}
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''}
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''}
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${cfg.extraSeatDefaults}
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'';
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defaultSessionName = dmDefault + optionalString (wmDefault != "none") ("+" + wmDefault);
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in
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{
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# Note: the order in which lightdm greeter modules are imported
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# here determines the default: later modules (if enable) are
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# preferred.
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imports = [
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./lightdm-greeters/gtk.nix
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./lightdm-greeters/mini.nix
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./lightdm-greeters/enso-os.nix
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./lightdm-greeters/pantheon.nix
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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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type = types.bool;
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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 = {
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enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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If set to false, run lightdm in greeterless mode. This only works if autologin
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is enabled and autoLogin.timeout is zero.
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'';
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};
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package = mkOption {
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type = types.package;
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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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};
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name = mkOption {
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type = types.string;
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description = ''
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The name of a .desktop file in the directory specified
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in the 'package' option.
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'';
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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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user-authority-in-system-dir = true
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'';
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description = "Extra lines to append to LightDM section.";
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};
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background = mkOption {
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type = types.str;
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default = "${pkgs.nixos-artwork.wallpapers.simple-dark-gray-bottom}/share/artwork/gnome/nix-wallpaper-simple-dark-gray_bottom.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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extraSeatDefaults = mkOption {
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type = types.lines;
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default = "";
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example = ''
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greeter-show-manual-login=true
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'';
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description = "Extra lines to append to SeatDefaults section.";
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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 the specified <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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timeout = mkOption {
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type = types.int;
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default = 0;
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description = ''
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Show the greeter for this many seconds before automatic login occurs.
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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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LightDM 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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LightDM auto-login requires services.xserver.displayManager.lightdm.autoLogin.user to be set
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'';
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}
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{ assertion = cfg.autoLogin.enable -> dmDefault != "none" || wmDefault != "none";
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message = ''
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LightDM 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: ${defaultSessionName} is not valid.
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'';
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}
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{ assertion = !cfg.greeter.enable -> (cfg.autoLogin.enable && cfg.autoLogin.timeout == 0);
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message = ''
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LightDM can only run without greeter if automatic login is enabled and the timeout for it
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is set to zero.
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'';
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}
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];
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# lightdm relaunches itself via just `lightdm`, so needs to be on the PATH
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services.xserver.displayManager.job.execCmd = ''
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export PATH=${lightdm}/sbin:$PATH
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exec ${lightdm}/sbin/lightdm
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'';
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environment.etc."lightdm/lightdm.conf".source = lightdmConf;
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environment.etc."lightdm/users.conf".source = usersConf;
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services.dbus.enable = true;
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services.dbus.packages = [ lightdm ];
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# lightdm uses the accounts daemon to remember language/window-manager per user
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services.accounts-daemon.enable = true;
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# Enable the accounts daemon to find lightdm's dbus interface
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environment.systemPackages = [ lightdm ];
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security.pam.services.lightdm = {
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allowNullPassword = true;
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startSession = true;
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};
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security.pam.services.lightdm-greeter = {
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allowNullPassword = true;
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startSession = true;
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text = ''
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auth required pam_env.so envfile=${config.system.build.pamEnvironment}
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auth required pam_permit.so
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account required pam_permit.so
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password required pam_deny.so
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session required pam_env.so envfile=${config.system.build.pamEnvironment}
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session required pam_unix.so
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session optional ${pkgs.systemd}/lib/security/pam_systemd.so
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'';
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};
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security.pam.services.lightdm-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 lightdm
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password include lightdm
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session include lightdm
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'';
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users.users.lightdm = {
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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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systemd.tmpfiles.rules = [
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"d /run/lightdm 0711 lightdm lightdm 0"
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"d /var/cache/lightdm 0711 root lightdm -"
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"d /var/lib/lightdm 1770 lightdm lightdm -"
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"d /var/lib/lightdm-data 1775 lightdm lightdm -"
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"d /var/log/lightdm 0711 root lightdm -"
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];
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users.groups.lightdm.gid = config.ids.gids.lightdm;
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services.xserver.tty = null; # We might start multiple X servers so let the tty increment themselves..
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services.xserver.display = null; # We specify our own display (and logfile) in xserver-wrapper up there
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};
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}
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