From 9b22a51712a81a14e1f0892bc6d94b7ee9d6d81b Mon Sep 17 00:00:00 2001
From: "Wael M. Nasreddine" <wael.nasreddine@gmail.com>
Date: Tue, 5 Mar 2019 10:53:21 -0800
Subject: [PATCH] build-support/docker: fix the build of tarsum with Go 1.12

---
 pkgs/build-support/docker/default.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pkgs/build-support/docker/default.nix b/pkgs/build-support/docker/default.nix
index 011ff368509..8d47f157013 100644
--- a/pkgs/build-support/docker/default.nix
+++ b/pkgs/build-support/docker/default.nix
@@ -77,6 +77,7 @@ rec {
 
     cp ${./tarsum.go} tarsum.go
     export GOPATH=$(pwd)
+    export GOCACHE="$TMPDIR/go-cache"
     mkdir -p src/github.com/docker/docker/pkg
     ln -sT ${docker.src}/components/engine/pkg/tarsum src/github.com/docker/docker/pkg/tarsum
     go build