Add srun wrapper and use pmi2

bsc/garlic/argv.nix

@@ -1,9 +1,11 @@
 {
   stdenv
+, bash
 }:
 
 {
   app
+, env ? ""
 , argv # bash array as string, example: argv=''(-f "file with spaces" -t 10)''
 }:
 
@@ -12,11 +14,14 @@ stdenv.mkDerivation {
   name = "${app.name}-argv";
   preferLocalBuild = true;
   phases = [ "installPhase" ];
-  dontPatchShebangs = true;
   installPhase = ''
     mkdir -p $out/bin
     cat > $out/bin/run <<EOF
-    #!/bin/sh
+    #!${bash}/bin/bash
+    # Requires /nix to use bash
+    
+    ${env}
+
     argv=${argv}
     exec ${app}/bin/run \''${argv[@]}
     EOF