1 files changed, 33 insertions, 0 deletions
diff --git a/nixpkgs/nixos/modules/services/x11/display-managers/default.nix b/nixpkgs/nixos/modules/services/x11/display-managers/default.nix
index aa6a5ec42be..e990a66d198 100644
--- a/nixpkgs/nixos/modules/services/x11/display-managers/default.nix
+++ b/nixpkgs/nixos/modules/services/x11/display-managers/default.nix
@@ -332,12 +332,45 @@ in
 
       };
 
+      # 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).";