···

       
113
       
113
       
 
       
        type = lib.types.nullOr lib.types.str // {

     

       
114
       
114
       
 
       
          description = "session name";

     

       
115
       
115
       
 
       
          check = d:

     

       
116
       
116
       
-
       
            lib.assertMsg (d != null -> (lib.types.str.check d && lib.elem d config.services.displayManager.sessionData.sessionNames)) ''

     

       
116
       
116
       
+
       
            lib.assertMsg (d != null -> (lib.types.str.check d && lib.elem d cfg.sessionData.sessionNames)) ''

     

       
117
       
117
       
 
       
                Default graphical session, '${d}', not found.

     

       
118
       
118
       
 
       
                Valid names for 'services.displayManager.defaultSession' are:

     

       
119
       
119
       
 
       
                  ${lib.concatStringsSep "\n  " cfg.sessionData.sessionNames}

     
···

       
187
       
187
       
 
       


     

       
188
       
188
       
 
       
    services.displayManager.sessionData = {

     

       
189
       
189
       
 
       
      desktops = installedSessions;

     

       
190
       
190
       
-
       
      sessionNames = lib.concatMap (p: p.providedSessions) config.services.displayManager.sessionPackages;

     

       
190
       
190
       
+
       
      sessionNames = lib.concatMap (p: p.providedSessions) cfg.sessionPackages;

     

       
191
       
191
       
 
       
      # We do not want to force users to set defaultSession when they have only single DE.

     

       
192
       
192
       
 
       
      autologinSession =

     

       
193
       
193
       
 
       
        if cfg.defaultSession != null then