anchor.diff:  
     makeInstallerTest =
       { createPartitions, fileSystems, testChannel ? false, grubVersion ? 2, grubDevice ? "/dev/vda" }:
  -    makeTest ({ ... }: {
  +    makeTest {
         inherit iso;
         nodes = if testChannel then { inherit webserver; } else { };
         testScript = testScriptFun {
           inherit createPartitions fileSystems testChannel grubVersion grubDevice;
         };
  -    });
  +    };
   
   
   in {
  
positive.code: 
            $machine->shutdown;
          '';
      });
  }
  
negative.code:     };
  
    # Rebuild the CD configuration with a little modification.
    rebuildCD = makeTest
      { inherit iso;
        nodes = { };
        testScript =
  