From 641025d410ec7212996ba9d7cea4d12ce8218886 Mon Sep 17 00:00:00 2001
From: Bas van Dijk <v.dijk.bas@gmail.com>
Date: Thu, 6 Sep 2018 08:44:19 +0200
Subject: [PATCH] haskellPackages.tensorflow-mnist-input-data: link data files
 instead of copying

This prevents duplication in the nix store.
---
 pkgs/development/haskell-modules/configuration-tensorflow.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/haskell-modules/configuration-tensorflow.nix b/pkgs/development/haskell-modules/configuration-tensorflow.nix
index 10ee30d81c8..dedcaf0cbc7 100644
--- a/pkgs/development/haskell-modules/configuration-tensorflow.nix
+++ b/pkgs/development/haskell-modules/configuration-tensorflow.nix
@@ -86,7 +86,7 @@ in
         network-uri
       ];
       preConfigure = pkgs.lib.strings.concatStringsSep "\n" (
-          map (x: "cp ${x} data/$(stripHash ${x})") downloads
+          map (x: "ln -s ${x} data/$(stripHash ${x})") downloads
         );
       libraryHaskellDepends = [ base ];
       homepage = "https://github.com/tensorflow/haskell#readme";