Reusing go libs in deis build

pkgs/development/tools/deis/default.nix

@@ -1,5 +1,5 @@
 # This file was generated by go2nix.
-{ stdenv, lib, goPackages, fetchgit, fetchhg, fetchbzr, fetchsvn }:
+{ stdenv, lib, goPackages, fetchgit }:
 
 with goPackages;
 
@@ -23,14 +23,5 @@ buildGoPackage rec {
     sha256 = "1fblg3gf7dh5hhm4ajq7yl7iy6gw8p5xlh4z8kvfy542m1fzr0dc";
   };
 
-  extraSrcs = map ( jsonDep:
-    {
-      inherit (jsonDep) goPackagePath;
-      src = if jsonDep.fetch.type == "git" then
-        fetchgit {
-          inherit (jsonDep.fetch) url rev sha256;
-        }
-        else {};
-    }
-  ) (builtins.fromJSON (builtins.readFile ../../go-modules/libs.json));
+  goDeps = ./deps.json;
 }

pkgs/development/tools/deis/deps.json

@@ -0,0 +1,10 @@
+[
+    {
+        "include": "../../../go-modules/libs.json",
+        "packages": [
+            "github.com/docopt/docopt-go",
+            "golang.org/x/crypto",
+            "gopkg.in/yaml.v2"
+        ]
+    }
+]