nixos/displayManager: make autoLogin options independent of DM type

Co-authored-by: volth <[e-mail]>

nixos/doc/manual/configuration/profiles/demo.xml

···
   This profile just enables a <systemitem class="username">demo</systemitem>
   user, with password <literal>demo</literal>, uid <literal>1000</literal>,
   <systemitem class="groupname">wheel</systemitem> group and
-  <link linkend="opt-services.xserver.displayManager.sddm.autoLogin"> autologin
-  in the SDDM display manager</link>.
+  <link linkend="opt-services.xserver.displayManager.autoLogin">autologin in the SDDM display manager</link>.
  </para>
 </section>

nixos/doc/manual/configuration/x-windows.xml

···
   using lightdm for a user <literal>alice</literal>:
 <programlisting>
 <xref linkend="opt-services.xserver.displayManager.lightdm.enable"/> = true;
-<xref linkend="opt-services.xserver.displayManager.lightdm.autoLogin.enable"/> = true;
-<xref linkend="opt-services.xserver.displayManager.lightdm.autoLogin.user"/> = "alice";
+<xref linkend="opt-services.xserver.displayManager.autoLogin.enable"/> = true;
+<xref linkend="opt-services.xserver.displayManager.autoLogin.user"/> = "alice";
 </programlisting>
-  The options are named identically for all other display managers.
   </para>
  </simplesect>
  <simplesect xml:id="sec-x11--graphics-cards-intel">

nixos/doc/manual/release-notes/rl-2003.xml

···
      The <option>services.xserver.displayManager.auto</option> module has been removed.
      It was only intended for use in internal NixOS tests, and gave the false impression
      of it being a special display manager when it's actually LightDM.
-     Please use the <xref linkend="opt-services.xserver.displayManager.lightdm.autoLogin"/> options instead,
+     Please use the <option>services.xserver.displayManager.lightdm.autoLogin</option> options instead,
      or any other display manager in NixOS as they all support auto-login. If you used this module specifically
      because it permitted root auto-login you can override the lightdm-autologin pam module like:
 <programlisting>

nixos/doc/manual/release-notes/rl-2009.xml

···
      automatically if <literal>stateVersion</literal> is 20.09 or higher.
     </para>
    </listitem>
+   <listitem>
+    <para>
+     We now have a unified <xref linkend="opt-services.xserver.displayManager.autoLogin"/> option interface
+     to be used for every display-manager in NixOS.
+    </para>
+   </listitem>
   </itemizedlist>
  </section>
 

nixos/modules/installer/cd-dvd/installation-cd-graphical-gnome.nix

···
 
   services.xserver.desktopManager.gnome3.enable = true;
 
-  services.xserver.displayManager.gdm = {
-    enable = true;
-    # autoSuspend makes the machine automatically suspend after inactivity.
-    # It's possible someone could/try to ssh'd into the machine and obviously
-    # have issues because it's inactive.
-    # See:
-    # * https://github.com/NixOS/nixpkgs/pull/63790
-    # * https://gitlab.gnome.org/GNOME/gnome-control-center/issues/22
-    autoSuspend = false;
+  services.xserver.displayManager = {
+    gdm = {
+      enable = true;
+      # autoSuspend makes the machine automatically suspend after inactivity.
+      # It's possible someone could/try to ssh'd into the machine and obviously
+      # have issues because it's inactive.
+      # See:
+      # * https://github.com/NixOS/nixpkgs/pull/63790
+      # * https://gitlab.gnome.org/GNOME/gnome-control-center/issues/22
+      autoSuspend = false;
+    };
     autoLogin = {
       enable = true;
       user = "nixos";

nixos/modules/installer/cd-dvd/installation-cd-graphical-plasma5.nix

···
     };
 
     # Automatically login as nixos.
-    displayManager.sddm = {
-      enable = true;
+    displayManager = {
+      sddm.enable = true;
       autoLogin = {
         enable = true;
         user = "nixos";

nixos/modules/profiles/demo.nix

···
       uid = 1000;
     };
 
-  services.xserver.displayManager.sddm.autoLogin = {
-    enable = true;
-    relogin = true;
-    user = "demo";
+  services.xserver.displayManager = {
+    autoLogin = {
+      enable = true;
+      user = "demo";
+    };
+    sddm.autoLogin.relogin = true;
   };
 }

nixos/modules/rename.nix

···
       The services.xserver.displayManager.auto module has been removed
       because it was only intended for use in internal NixOS tests, and gave the
       false impression of it being a special display manager when it's actually
-      LightDM. Please use the services.xserver.displayManager.lightdm.autoLogin options
+      LightDM. Please use the services.xserver.displayManager.autoLogin options
       instead, or any other display manager in NixOS as they all support auto-login.
     '')
     (mkRemovedOptionModule [ "services" "dnscrypt-proxy" ] "Use services.dnscrypt-proxy2 instead")

nixos/modules/services/x11/display-managers/default.nix

···
 
       };
 
+      # Configuration for automatic login. Common for all DM.
+      autoLogin = mkOption {
+        type = types.submodule {
+          options = {
+            enable = mkOption {
+              type = types.bool;
+              default = cfg.displayManager.autoLogin.user != null;
+              description = ''
+                Automatically log in as <option>autoLogin.user</option>.
+              '';
+            };
+
+            user = mkOption {
+              type = types.nullOr types.str;
+              default = null;
+              description = ''
+                User to be used for the automatic login.
+              '';
+            };
+          };
+        };
+        
+        default = {};
+        description = ''
+          Auto login configuration attrset.
+        '';
+      };
+
     };
 
   };
 
   config = {
     assertions = [
+      { assertion = cfg.displayManager.autoLogin.enable -> cfg.displayManager.autoLogin.user != null;
+        message = ''
+          services.xserver.displayManager.autoLogin.enable requires services.xserver.displayManager.autoLogin.user to be set
+        '';
+      }
       {
         assertion = cfg.desktopManager.default != null || cfg.windowManager.default != null -> cfg.displayManager.defaultSession == defaultSessionFromLegacyOptions;
         message = "You cannot use both services.xserver.displayManager.defaultSession option and legacy options (services.xserver.desktopManager.default and services.xserver.windowManager.default).";

nixos/modules/services/x11/display-managers/gdm.nix

···
 in
 
 {
+  imports = [
+    (mkRenamedOptionModule [ "services" "xserver" "displayManager" "gdm" "autoLogin" "enable" ] [
+      "services"
+      "xserver"
+      "displayManager"
+      "autoLogin"
+      "enable"
+    ])
+    (mkRenamedOptionModule [ "services" "xserver" "displayManager" "gdm" "autoLogin" "user" ] [
+      "services"
+      "xserver"
+      "displayManager"
+      "autoLogin"
+      "user"
+    ])
+  ];
 
   meta = {
     maintainers = teams.gnome.members;
···
         debugging messages in GDM
       '';
 
-      autoLogin = mkOption {
-        default = {};
+      # Auto login options specific to GDM
+      autoLogin.delay = mkOption {
+        type = types.int;
+        default = 0;
         description = ''
-          Auto login configuration attrset.
+          Seconds of inactivity after which the autologin will be performed.
         '';
-
-        type = types.submodule {
-          options = {
-            enable = mkOption {
-              type = types.bool;
-              default = false;
-              description = ''
-                Automatically log in as the sepecified <option>autoLogin.user</option>.
-              '';
-            };
-
-            user = mkOption {
-              type = types.nullOr types.str;
-              default = null;
-              description = ''
-                User to be used for the autologin.
-              '';
-            };
-
-            delay = mkOption {
-              type = types.int;
-              default = 0;
-              description = ''
-                Seconds of inactivity after which the autologin will be performed.
-              '';
-            };
-
-          };
-        };
       };
 
       wayland = mkOption {
···
   ###### implementation
 
   config = mkIf cfg.gdm.enable {
-
-    assertions = [
-      { assertion = cfg.gdm.autoLogin.enable -> cfg.gdm.autoLogin.user != null;
-        message = "GDM auto-login requires services.xserver.displayManager.gdm.autoLogin.user to be set";
-      }
-    ];
 
     services.xserver.displayManager.lightdm.enable = false;
 
···
     environment.etc."gdm/custom.conf".text = ''
       [daemon]
       WaylandEnable=${if cfg.gdm.wayland then "true" else "false"}
-      ${optionalString cfg.gdm.autoLogin.enable (
+      ${optionalString cfg.autoLogin.enable (
         if cfg.gdm.autoLogin.delay > 0 then ''
           TimedLoginEnable=true
-          TimedLogin=${cfg.gdm.autoLogin.user}
+          TimedLogin=${cfg.autoLogin.user}
           TimedLoginDelay=${toString cfg.gdm.autoLogin.delay}
         '' else ''
           AutomaticLoginEnable=true
-          AutomaticLogin=${cfg.gdm.autoLogin.user}
+          AutomaticLogin=${cfg.autoLogin.user}
         '')
       }
 

nixos/modules/services/x11/display-managers/lightdm.nix

···
       ${optionalString cfg.greeter.enable ''
         greeter-session = ${cfg.greeter.name}
       ''}
-      ${optionalString cfg.autoLogin.enable ''
-        autologin-user = ${cfg.autoLogin.user}
+      ${optionalString dmcfg.autoLogin.enable ''
+        autologin-user = ${dmcfg.autoLogin.user}
         autologin-user-timeout = ${toString cfg.autoLogin.timeout}
         autologin-session = ${sessionData.autologinSession}
       ''}
···
     ./lightdm-greeters/enso-os.nix
     ./lightdm-greeters/pantheon.nix
     ./lightdm-greeters/tiny.nix
+    (mkRenamedOptionModule [ "services" "xserver" "displayManager" "lightdm" "autoLogin" "enable" ] [
+      "services"
+      "xserver"
+      "displayManager"
+      "autoLogin"
+      "enable"
+    ])
+    (mkRenamedOptionModule [ "services" "xserver" "displayManager" "lightdm" "autoLogin" "user" ] [
+     "services"
+     "xserver"
+     "displayManager"
+     "autoLogin"
+     "user"
+    ])
   ];
 
   options = {
···
         description = "Extra lines to append to SeatDefaults section.";
       };
 
-      autoLogin = mkOption {
-        default = {};
+      # Configuration for automatic login specific to LightDM
+      autoLogin.timeout = mkOption {
+        type = types.int;
+        default = 0;
         description = ''
-          Configuration for automatic login.
+          Show the greeter for this many seconds before automatic login occurs.
         '';
-
-        type = types.submodule {
-          options = {
-            enable = mkOption {
-              type = types.bool;
-              default = false;
-              description = ''
-                Automatically log in as the specified <option>autoLogin.user</option>.
-              '';
-            };
-
-            user = mkOption {
-              type = types.nullOr types.str;
-              default = null;
-              description = ''
-                User to be used for the automatic login.
-              '';
-            };
-
-            timeout = mkOption {
-              type = types.int;
-              default = 0;
-              description = ''
-                Show the greeter for this many seconds before automatic login occurs.
-              '';
-            };
-          };
-        };
       };
 
     };
···
           LightDM requires services.xserver.enable to be true
         '';
       }
-      { assertion = cfg.autoLogin.enable -> cfg.autoLogin.user != null;
-        message = ''
-          LightDM auto-login requires services.xserver.displayManager.lightdm.autoLogin.user to be set
-        '';
-      }
-      { assertion = cfg.autoLogin.enable -> sessionData.autologinSession != null;
+      { assertion = dmcfg.autoLogin.enable -> sessionData.autologinSession != null;
         message = ''
           LightDM auto-login requires that services.xserver.displayManager.defaultSession is set.
         '';
       }
-      { assertion = !cfg.greeter.enable -> (cfg.autoLogin.enable && cfg.autoLogin.timeout == 0);
+      { assertion = !cfg.greeter.enable -> (dmcfg.autoLogin.enable && cfg.autoLogin.timeout == 0);
         message = ''
           LightDM can only run without greeter if automatic login is enabled and the timeout for it
           is set to zero.
···
 
     # Set default session in session chooser to a specified values – basically ignore session history.
     # Auto-login is already covered by a config value.
-    services.xserver.displayManager.job.preStart = optionalString (!cfg.autoLogin.enable && dmcfg.defaultSession != null) ''
+    services.xserver.displayManager.job.preStart = optionalString (!dmcfg.autoLogin.enable && dmcfg.defaultSession != null) ''
       ${setSessionScript}/bin/set-session ${dmcfg.defaultSession}
     '';
 

nixos/modules/services/x11/display-managers/sddm.nix

···
     EnableHidpi=${if cfg.enableHidpi then "true" else "false"}
     SessionDir=${dmcfg.sessionData.desktops}/share/wayland-sessions
 
-    ${optionalString cfg.autoLogin.enable ''
+    ${optionalString dmcfg.autoLogin.enable ''
     [Autologin]
-    User=${cfg.autoLogin.user}
+    User=${dmcfg.autoLogin.user}
     Session=${autoLoginSessionName}.desktop
     Relogin=${boolToString cfg.autoLogin.relogin}
     ''}
···
   imports = [
     (mkRemovedOptionModule [ "services" "xserver" "displayManager" "sddm" "themes" ]
       "Set the option `services.xserver.displayManager.sddm.package' instead.")
+    (mkRenamedOptionModule [ "services" "xserver" "displayManager" "sddm" "autoLogin" "enable" ] [
+      "services"
+      "xserver"
+      "displayManager"
+      "autoLogin"
+      "enable"
+    ])
+    (mkRenamedOptionModule [ "services" "xserver" "displayManager" "sddm" "autoLogin" "user" ] [
+      "services"
+      "xserver"
+      "displayManager"
+      "autoLogin"
+      "user"
+    ])
   ];
 
   options = {
···
         '';
       };
 
-      autoLogin = mkOption {
-        default = {};
+      # Configuration for automatic login specific to SDDM
+      autoLogin.relogin = mkOption {
+        type = types.bool;
+        default = false;
         description = ''
-          Configuration for automatic login.
+          If true automatic login will kick in again on session exit (logout), otherwise it
+          will only log in automatically when the display-manager is started.
         '';
-
-        type = types.submodule {
-          options = {
-            enable = mkOption {
-              type = types.bool;
-              default = false;
-              description = ''
-                Automatically log in as <option>autoLogin.user</option>.
-              '';
-            };
-
-            user = mkOption {
-              type = types.nullOr types.str;
-              default = null;
-              description = ''
-                User to be used for the automatic login.
-              '';
-            };
-
-            relogin = mkOption {
-              type = types.bool;
-              default = false;
-              description = ''
-                If true automatic login will kick in again on session exit (logout), otherwise it
-                will only log in automatically when the display-manager is started.
-              '';
-            };
-          };
-        };
       };
 
     };
···
           SDDM requires services.xserver.enable to be true
         '';
       }
-      { assertion = cfg.autoLogin.enable -> cfg.autoLogin.user != null;
-        message = ''
-          SDDM auto-login requires services.xserver.displayManager.sddm.autoLogin.user to be set
-        '';
-      }
-      { assertion = cfg.autoLogin.enable -> autoLoginSessionName != null;
+      { assertion = dmcfg.autoLogin.enable -> autoLoginSessionName != null;
         message = ''
           SDDM auto-login requires that services.xserver.displayManager.defaultSession is set.
         '';

nixos/tests/common/auto.nix

···
 
   config = mkIf cfg.enable {
 
-    services.xserver.displayManager.lightdm = {
-      enable = true;
+    services.xserver.displayManager = {
+      lightdm.enable = true;
       autoLogin = {
         enable = true;
         user = cfg.user;

nixos/tests/gnome3-xorg.nix

···
 
       services.xserver.enable = true;
 
-      services.xserver.displayManager.gdm = {
-        enable = true;
+      services.xserver.displayManager = {
+        gdm.enable = true;
         autoLogin = {
           enable = true;
           user = user.name;

nixos/tests/gnome3.nix

···
 
       services.xserver.enable = true;
 
-      services.xserver.displayManager.gdm = {
-        enable = true;
+      services.xserver.displayManager = {
+        gdm.enable = true;
         autoLogin = {
           enable = true;
           user = "alice";

nixos/tests/plasma5.nix

···
     services.xserver.displayManager.sddm.enable = true;
     services.xserver.displayManager.defaultSession = "plasma5";
     services.xserver.desktopManager.plasma5.enable = true;
-    services.xserver.displayManager.sddm.autoLogin = {
+    services.xserver.displayManager.autoLogin = {
       enable = true;
       user = "alice";
     };

nixos/tests/sddm.nix

···
       machine = { ... }: {
         imports = [ ./common/user-account.nix ];
         services.xserver.enable = true;
-        services.xserver.displayManager.sddm = {
-          enable = true;
+        services.xserver.displayManager = {
+          sddm.enable = true;
           autoLogin = {
             enable = true;
             user = "alice";

nixos/tests/xfce.nix

···
 
       services.xserver.enable = true;
 
-      services.xserver.displayManager.lightdm = {
-        enable = true;
+      services.xserver.displayManager = {
+        lightdm.enable = true;
         autoLogin = {
           enable = true;
           user = "alice";