Expose our packages in flake packages output

Reviewed-by: Aleix Boné <abonerib@bsc.es>

flake.nix

@@ -3,15 +3,33 @@
 
   outputs = { self, nixpkgs, ...}:
   let
+    system = "x86_64-linux";
     pkgs = import nixpkgs {
+      inherit system;
       # For now we only support x86
-      system = "x86_64-linux";
       overlays = [ self.overlays.default ];
     };
   in
     {
       bscOverlay = import ./overlay.nix;
       overlays.default = self.bscOverlay;
-      legacyPackages.x86_64-linux = pkgs;
+
+      # full nixpkgs with our overlay applied
+      legacyPackages.${system} = pkgs;
+
+      # packages added by our overlay
+      packages.${system} =
+        let
+          inherit (builtins) attrNames removeAttrs;
+          inherit (nixpkgs.lib) flip filterAttrs getAttrs pipe isDerivation;
+        in
+          # extract the names of the packages from the overlay, then get the
+          # actual packages from the full package set with the overlay applied
+          pipe (self.overlays.default null null) [
+            attrNames
+            (flip getAttrs pkgs)
+            (flip removeAttrs [ "bsc" ])
+            (filterAttrs (_: isDerivation))
+          ];
     };
 }

pkgs/bench6/default.nix

@@ -1,14 +1,22 @@
 {
   stdenv
+, bigotes
 , cmake
 , clangOmpss2
+, openmp
+, openmpv
 , nanos6
 , nodes
+, nosv
 , mpi
 , tampi
+, tagaspi
+, gpi-2
+, openblas
+, ovni
 , gitBranch ? "master"
 , gitURL ? "ssh://git@bscpm04.bsc.es/rarias/bench6.git"
-, gitCommit ? "1e6ce2aa8ad7b4eef38df1581d7ec48a8815f85d"
+, gitCommit ? "bf29a53113737c3aa74d2fe3d55f59868faea7b4"
 }:
 
 stdenv.mkDerivation rec {
@@ -21,9 +29,30 @@ stdenv.mkDerivation rec {
     rev = gitCommit;
   };
 
-  buildInputs = [ cmake clangOmpss2 nanos6 nodes mpi tampi ];
+  buildInputs = [
+    bigotes
+    cmake
+    clangOmpss2
+    openmp
+    openmpv
+    nanos6
+    nodes
+    nosv
+    mpi
+    tampi
+    tagaspi
+    gpi-2
+    openblas
+    openblas.dev
+    ovni
+  ];
+
+  env = {
+    NANOS6_HOME = nanos6;
+    NODES_HOME = nodes;
+    NOSV_HOME = nosv;
+  };
 
-  enableParallelBuilding = false;
   cmakeFlags = [
     "-DCMAKE_C_COMPILER=clang"
     "-DCMAKE_CXX_COMPILER=clang++"