From f100ec793923f50b546f4f3564912064533f3f4f Mon Sep 17 00:00:00 2001
From: Neil Mayhew <neil_mayhew@users.sourceforge.net>
Date: Fri, 26 Apr 2019 18:33:05 -0600
Subject: [PATCH] docker: make overridable

---
 pkgs/applications/virtualization/docker/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/applications/virtualization/docker/default.nix b/pkgs/applications/virtualization/docker/default.nix
index b634625206a..40d4ea85b6a 100644
--- a/pkgs/applications/virtualization/docker/default.nix
+++ b/pkgs/applications/virtualization/docker/default.nix
@@ -200,7 +200,7 @@ rec {
   # Get revisions from
   # https://github.com/docker/docker-ce/tree/v${version}/components/engine/hack/dockerfile/install/*
 
-  docker_18_09 = dockerGen rec {
+  docker_18_09 = makeOverridable dockerGen {
     version = "18.09.2";
     rev = "62479626f213818ba5b4565105a05277308587d5"; # git commit
     sha256 = "05kvpy1c4g661xfds6dfzb8r5q76ndblxjykfj06had18pv0xxd4";