nixos/cosmic-greeter: add autologin support (#395741)

Author: GaetanLepage

nixos/modules/services/display-managers/cosmic-greeter.nix

@@ -12,6 +12,7 @@
 
 let
   cfg = config.services.displayManager.cosmic-greeter;
+  cfgAutoLogin = config.services.displayManager.autoLogin;
 in
 
 {
@@ -35,6 +36,10 @@ in
           user = "cosmic-greeter";
           command = ''${lib.getExe' pkgs.coreutils "env"} XCURSOR_THEME="''${XCURSOR_THEME:-Pop}" systemd-cat -t cosmic-greeter ${lib.getExe pkgs.cosmic-comp} ${lib.getExe cfg.package}'';
         };
+        initial_session = lib.mkIf (cfgAutoLogin.enable && (cfgAutoLogin.user != null)) {
+          user = cfgAutoLogin.user;
+          command = ''${lib.getExe' pkgs.coreutils "env"} XCURSOR_THEME="''${XCURSOR_THEME:-Pop}" systemd-cat -t cosmic-session ${lib.getExe pkgs.cosmic-session}'';
+        };
       };
     };