add assertions on base

options.nix

@@ -128,6 +128,10 @@ let
       };
     };
   };
+
+  annuaire = config.r6d.machines;
+  currentMachine = annuaire."${config.networking.hostName}";
+  flags = currentMachine.configuration-flags;
 in
 
 {
@@ -139,4 +143,33 @@ in
       '';
     };
   };
+
+  config = {
+    /**
+     prototype : (expression A ) && tests || !(expression A) ->   réalise le test si A est satisfait, et continue sinon = pas de politique
+    */
+    assertions = [
+     {
+       assertion = (currentMachine.profiles.isWorkstation && (currentMachine.profiles.isDesktopEnvironment == true))
+                 || (!currentMachine.profiles.isWorkstation);
+       message = "A workstation requires a graphical environement.";
+     }
+     {
+       assertion = (currentMachine.profiles.isDesktopEnvironment && (config.services.xserver.enable == true))
+                 || (!currentMachine.profiles.isDesktopEnvironment);
+       message = "You need to enable xserver manually.";
+     }
+     {
+       assertion = (currentMachine.profiles.isServer  && (currentMachine.profiles.isDesktopEnvironment == false))
+                 || (!currentMachine.profiles.isServer);
+       message = "A graphical environment is not required for a server.";
+     }
+     {
+       /*  authorité xor resolveur */
+       assertion = (flags.dns_autorite && ! flags.dns_resolveur)
+                 || (!flags.dns_autorite && flags.dns_resolveur);
+       message = "Both authoritative and recursor DNS services can't be live simultaneously. Choose only one!";
+     }
+    ];
+  };
 }