Use the stage names as inputs

garlic/postprocess/result.nix

@@ -5,20 +5,20 @@
 }:
 
 {
-  experiment
+  trebuchetStage
+, experimentStage
 , garlicTemp
 }:
 
 with garlicTools;
 
 let
-  experimentStage = getExperimentStage experiment;
   experimentName = baseNameOf (toString experimentStage);
   fetcher = fetchExperiment {
     sshHost = "mn1";
     prefix = "/gpfs/projects/\\\$(id -gn)/\\\$(id -un)/garlic-out";
     garlicTemp = "/tmp/garlic-temp";
-    inherit experiment;
+    inherit experimentStage trebuchetStage;
   };
 in
   stdenv.mkDerivation {
@@ -33,7 +33,7 @@ in
       if [ ! -e $expPath ]; then
         echo "The experiment ${experimentName} is missing in ${garlicTemp}."
         echo "Please fetch it and try again."
-        echo "You can execute ${experiment} to run the experiment."
+        echo "You can execute ${trebuchetStage} to run the experiment."
         echo "And then ${fetcher} to get the results."
         exit 1
       fi