fixup! Add nix-tools

- Use the build expressions from the nix-tools repo.

Author: rvl

nix-tools/default.nix

@@ -1,35 +1,13 @@
-{ lib, symlinkJoin
-, fetchExternal
-, mkPkgSet
-}:
+{ symlinkJoin, fetchExternal, mkPkgSet }:
 
 let
-
   src = fetchExternal {
     name     = "nix-tools-src";
     specJSON = ./nix-tools-src.json;
     override = "nix-tools";
   };
 
-  plan = import ./plan.nix;
-
-  pkgSet = mkPkgSet {
-    pkg-def = plan;
-    pkg-def-overlays = [
-      { nix-tools        = ./nix-tools.nix;
-        # these are generated with cabal-to-nix
-        # $ cabal-to-nix https://github.com/galenhuntington/haskell-src-meta.git 109ee29d5fd0f4e23fdd2f80eb122d66341b64a9 > haskell-src-meta.nix
-        hackage-db       = ./hackage-db.nix;
-        haskell-src-meta = ./haskell-src-meta.nix;
-        hnix             = ./hnix.nix;
-      }
-    ];
-    modules = [
-      { packages.nix-tools.src = src; }
-    ];
-  };
-
-  hsPkgs = pkgSet.config.hsPkgs;
+  hsPkgs = import (src + "/pkgs.nix") { inherit mkPkgSet; };
 in
   symlinkJoin {
     name = "nix-tools";

nix-tools/hackage-db.nix

@@ -1,9 +1,7 @@
 {
   "url": "https://github.com/input-output-hk/nix-tools",
-  "owner": "input-output-hk",
-  "repo": "nix-tools",
-  "rev": "11186ed3b8109b98b38bcd0e33a9530e59868510",
-  "date": "2019-01-16T16:14:55+08:00",
-  "sha256": "1s26nk24iqzbmzixwv7sgm982kbzqgprn5snrhzzxya2zvyhzp4i",
+  "rev": "fd56254dde13edfe97985d8125d7bccc9758b6af",
+  "date": "2019-02-11T14:03:56+10:00",
+  "sha256": "1bw24njd0nh17v0cb3shl31g0n1j1m0ydd9yl3kwmqyrxf3pm2ml",
   "fetchSubmodules": false
 }