[Refactor] adding declarative channel.

pkgs/default.nix

 {
   hostPkgs ? import <nixpkgs> {},
-  pkgs         ? import ../pin.nix { inherit hostPkgs; jsonpath=../nixpkgs-18.03.json; },
+  system ? builtins.currentSystem,
+  pkgs         ? import ../pin.nix { inherit hostPkgs; jsonpath=../nixpkgs-18.03.json; depset = {inherit system;}; },
   kapack       ? import ../pin.nix { hostPkgs = pkgs ; jsonpath=../kapack.json; depset = {hostPkgs=pkgs;};},
+ supportedSystems ? [ "x86_64-linux" "i686-linux" ]
 }:
 let
+  releaseTools = import "${pkgs}/top-level/release-lib.nix" {
+    inherit supportedSystems;
+  };
+
   gitpin = f: pkgs.fetchgit {inherit (pkgs.lib.importJSON f) url sha256 rev fetchSubmodules;};
   compiler_path = "/opt/intel/compilers_and_libraries_2017.1.132/linux";
   callPackage = pkgs.lib.callPackageWith pkgs;
@@ -24,63 +30,73 @@ let
   cpAlternatePin = folderPath: depset: jsonName: callPackagePinWith {inherit folderPath depset jsonName;};
   cpBothAlternatePin = folderPath: depset: jsonName: callPackagePinWith {inherit folderPath depset jsonName; nixName=jsonName;};
   pythonPackages = pkgs.python27Packages;
-in rec {
-  #NRM components
-  tools = rec {
-    inherit (kapack) zymake;
-  };
+  
+  argopkgs = rec {
+    #NRM components
+    tools = rec {
+      inherit (kapack) zymake;
+    };
 
-  nodelevel = rec {
-    libnrm = cpDefaultPin ./libnrm {};
-    libnrm-pmpi = libnrm.overrideAttrs (oldAttrs: rec {
-      configureFlags = "--enable-pmpi";
-      buildInputs = oldAttrs.buildInputs ++ [ pkgs.mpich2 ];
-    });
-    containers = cpDefaultPin ./containers { inherit pythonPackages; };
-    containers-bandit = cpAlternatePin ./containers { inherit pythonPackages; } "bandit";
-    nrm = cpDefaultPin ./nrm { inherit pythonPackages; nrm-containers = containers; };
-    nrm-bandit = cpAlternatePin ./nrm { inherit pythonPackages; nrm-containers=containers-bandit; } "bandit";
-  };
+    nodelevel = rec {
+      libnrm = cpDefaultPin ./libnrm {};
+      libnrm-pmpi = libnrm.overrideAttrs (oldAttrs: rec {
+        configureFlags = "--enable-pmpi";
+        buildInputs = oldAttrs.buildInputs ++ [ pkgs.mpich2 ];
+      });
+      containers = cpDefaultPin ./containers { inherit pythonPackages; };
+      containers-bandit = cpAlternatePin ./containers { inherit pythonPackages; } "bandit";
+      nrm = cpDefaultPin ./nrm { inherit pythonPackages; nrm-containers = containers; };
+      nrm-bandit = cpAlternatePin ./nrm { inherit pythonPackages; nrm-containers=containers-bandit; } "bandit";
+    };
 
-  #Instrumented applications
-  applications =
-  let
-    paths = {
-     amg = applications/amg;
-     qmcpack = applications/qmcpack;
-     openmc = applications/openmc;
-     stream = applications/stream;
-     lammps = applications/lammps;
+    #Instrumented applications
+    applications =
+    let
+      paths = {
+       amg = applications/amg;
+       qmcpack = applications/qmcpack;
+       openmc = applications/openmc;
+       stream = applications/stream;
+       lammps = applications/lammps;
+      };
+      rawApplication = name : path: cpDefaultPin path {};
+      instrumentedApplication = name: path:
+        (cpAlternatePin path {} "nrm").overrideAttrs (oldAttrs:
+        {
+          buildInputs = oldAttrs.buildInputs ++ [nodelevel.libnrm];
+          cmakeFlags = if (name=="qmcpack") then
+          (oldAttrs.cmakeFlags ++ [ ''-DQMC_INCLUDE=${nodelevel.libnrm}/include/'' ''-DQMC_EXTRA_LIBS=${nodelevel.libnrm}/lib/libnrm.so'' ])
+          else
+          [];
+        });
+    in
+    rec {
+      raw = pkgs.lib.mapAttrs rawApplication paths;
+      nrm = (pkgs.lib.mapAttrs instrumentedApplication paths) // {
+        dgemm_randomwalk = cpBothAlternatePin applications/simple {inherit intel; inherit (nodelevel) libnrm;} "dgemm_randomwalk";
+        graph500 = cpBothAlternatePin applications/simple { inherit (nodelevel) libnrm;} "graph500";
+      };
     };
-    rawApplication = name : path: cpDefaultPin path {};
-    instrumentedApplication = name: path:
-      (cpAlternatePin path {} "nrm").overrideAttrs (oldAttrs:
-      {
-        buildInputs = oldAttrs.buildInputs ++ [nodelevel.libnrm];
-        cmakeFlags = if (name=="qmcpack") then
-        (oldAttrs.cmakeFlags ++ [ ''-DQMC_INCLUDE=${nodelevel.libnrm}/include/'' ''-DQMC_EXTRA_LIBS=${nodelevel.libnrm}/lib/libnrm.so'' ])
-        else
-        [];
+
+    #Intel compilers
+    intel = with pkgs; rec {
+      icc = callPackage intel/icc { inherit compiler_path; };
+      mkl = callPackage intel/mkl { inherit compiler_path; };
+      WrappedICC = (import intel/cc-wrapper  {
+          inherit stdenv binutils coreutils ;
+          libc = glibc;
+          nativeTools = false;
+          nativeLibc = false;
+          cc = icc;
       });
-  in
-  rec {
-    raw = pkgs.lib.mapAttrs rawApplication paths;
-    nrm = (pkgs.lib.mapAttrs instrumentedApplication paths) // {
-      dgemm_randomwalk = cpBothAlternatePin applications/simple {inherit intel; inherit (nodelevel) libnrm;} "dgemm_randomwalk";
-      graph500 = cpBothAlternatePin applications/simple { inherit (nodelevel) libnrm;} "graph500";
     };
-  };
 
-  #Intel compilers
-  intel = with pkgs; rec {
-    icc = callPackage intel/icc { inherit compiler_path; };
-    mkl = callPackage intel/mkl { inherit compiler_path; };
-    WrappedICC = (import intel/cc-wrapper  {
-        inherit stdenv binutils coreutils ;
-        libc = glibc;
-        nativeTools = false;
-        nativeLibc = false;
-        cc = icc;
-    });
+    argopkgs = pkgs.releaseTools.channel {
+      name = "argopkgs";
+      src = ./.;
+      constituents = [ ];
+    };
+
   };
-}
+
+in argopkgs