Use the stage names as inputs

garlic/postprocess/fetch.nix

@@ -10,14 +10,14 @@
 {
   sshHost
 , prefix
-, experiment
+, experimentStage
+, trebuchetStage
 , garlicTemp
 }:
 
 with garlicTools;
 
 let
-  experimentStage = getExperimentStage experiment;
   experimentName = baseNameOf (toString experimentStage);
 in
   stdenv.mkDerivation {
@@ -33,11 +33,15 @@ in
       mkdir -p ${garlicTemp}
       export PATH=${rsync}/bin:${openssh}/bin:${nix}/bin
       rsync -av \
+        --copy-links \
         --include='*/*/*.log' --include='*/*/*.json' --exclude='*/*/*' \
         '${sshHost}:${prefix}/${experimentName}' ${garlicTemp}
 
-      res=\$(nix-build -E '(with import ./default.nix; garlic.getExpResult \
-        {experiment = "${experiment}"; garlicTemp = "${garlicTemp}"; })')
+      res=\$(nix-build -E '(with import ./default.nix; garlic.getExpResult { \
+        experimentStage = "${experimentStage}"; \
+        trebuchetStage = "${trebuchetStage}"; \
+        garlicTemp = "${garlicTemp}"; \
+      })')
 
       echo "The results for experiment ${experimentName} are at:"
       echo "  \$res"

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