From ff55c41facaa6812f9cc879a49f6929321881d4f Mon Sep 17 00:00:00 2001
From: Robert Hensing <robert@roberthensing.nl>
Date: Tue, 1 Jun 2021 14:42:21 +0200
Subject: [PATCH] dockerTools: Fix passthru image tag

It should match the actual image tag.
This fixes the problem introduced in 00996b5e03f33bebafc2b17c41a175d3726a9bde
https://github.com/NixOS/nixpkgs/pull/115491#pullrequestreview-672789901
---
 pkgs/build-support/docker/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/build-support/docker/default.nix b/pkgs/build-support/docker/default.nix
index 5bbf1b63f2b0..89510cd6330c 100644
--- a/pkgs/build-support/docker/default.nix
+++ b/pkgs/build-support/docker/default.nix
@@ -536,7 +536,7 @@ rec {
         passthru.layer = layer;
         passthru.imageTag =
           if tag != null
-            then lib.toLower tag
+            then tag
             else
               lib.head (lib.strings.splitString "-" (baseNameOf result.outPath));
         # Docker can't be made to run darwin binaries