creams: use python script to generate the input

garlic/apps/creams/input.nix

@@ -1,7 +1,13 @@
 {
   stdenv
-, granul ? 0
-, nprocz ? 0
+, python3
+, granul ? 9
+, nprocx ? 1
+, nprocy ? 1
+, nprocz ? 1
+, nx ? 20
+, ny ? 20
+, nz ? 7000
 , gitBranch ? "garlic/mpi+send+seq"
 , gitCommit ? null
 , garlicTools
@@ -13,26 +19,30 @@ let
     inherit gitCommit gitBranch;
     gitTable = import ./git-table.nix;
   };
+
+  gen = ./gen_grid.py;
 in
   stdenv.mkDerivation rec {
     name = "creams-input";
 
+    buildInputs = [ python3 ];
+
     inherit (gitSource) src gitBranch gitCommit;
 
-    phases = [ "unpackPhase" "patchPhase" "installPhase" ];
-
-    patchPhase = ''
-      patchShebangs SodTubeBenchmark/gridScript.sh
-    '';
+    phases = [ "unpackPhase" "installPhase" ];
 
     installPhase = ''
-      pushd SodTubeBenchmark
-        ./gridScript.sh 0 0 ${toString nprocz} ${toString granul}
-      popd
-
       mkdir -p $out
       cp -a SodTubeBenchmark $out/
-    '';
 
-    hardeningDisable = [ "all" ];
+      python3 ${gen} \
+        --npx ${toString nprocx} \
+        --npy ${toString nprocy} \
+        --npz ${toString nprocz} \
+        --grain ${toString granul} \
+        --nx ${toString nx} \
+        --ny ${toString ny} \
+        --nz ${toString nz} \
+        > $out/SodTubeBenchmark/grid.dat
+    '';
   }