add nix expressions for building hnix-store-*

Author: imalsogreg

hnix-store-core/hnix-store-core.cabal

@@ -26,7 +26,7 @@ library
                      , System.Nix.Path
                      , System.Nix.Store
                      , System.Nix.Util
-  build-depends:       base >=4.10 && <4.11
+  build-depends:       base >=4.10 && <4.12
                      , bytestring
                      , binary
                      , bytestring

hnix-store-core/shell.nix

@@ -0,0 +1 @@
+(import ../release.nix).hnix-store-core.env

hnix-store-remote/hnix-store-remote.cabal

@@ -20,7 +20,7 @@ library
                      , System.Nix.Store.Remote.Types
                      , System.Nix.Store.Remote.Util
 
-  build-depends:       base >=4.10 && <4.11
+  build-depends:       base >=4.10 && <4.12
                      , bytestring
                      , binary
                      , bytestring

hnix-store-remote/shell.nix

@@ -0,0 +1 @@
+(import ../release.nix).hnix-store-remote.env

release.nix

@@ -0,0 +1,31 @@
+let
+
+  # TODO pin nixpkgs
+  pkgs0 = import <nixpkgs>;
+
+  hsOverrides = self: super: {
+    hnix-store-core   = pkgs.haskellPackages.callCabal2nix "hnix-store-core"   ./hnix-store-core {};
+    hnix-store-remote = pkgs.haskellPackages.callCabal2nix "hnix-store-remote" ./hnix-store-remote {};
+  };
+
+  pkgs = pkgs0 {
+    overlays = [ (self: super: {
+      haskellPackages = super.haskellPackages.override {
+        overrides = hsOverrides;
+      };
+    }) ];
+  };
+
+  # pkgs = pkgs0.override {
+  #   overrides = self: super: {
+  #     haskellPackages = self.haskellPackages.override {
+  #       overrides = hsOverrides;
+  #     };
+  #   };
+  # };
+
+in
+{
+  hnix-store-core   = pkgs.haskellPackages.hnix-store-core;
+  hnix-store-remote = pkgs.haskellPackages.hnix-store-remote;
+}