From f6d75f550ebcea9145b5b63473ce2652e580a44e Mon Sep 17 00:00:00 2001
From: Graham Christensen <graham@grahamc.com>
Date: Mon, 16 Dec 2019 12:36:45 -0500
Subject: [PATCH] dockerTools.buildLayeredImage: tweak formatting on
 contentsEnv

---
 pkgs/build-support/docker/default.nix | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/pkgs/build-support/docker/default.nix b/pkgs/build-support/docker/default.nix
index 2a25ac04d40f..0781c7dd4f1e 100644
--- a/pkgs/build-support/docker/default.nix
+++ b/pkgs/build-support/docker/default.nix
@@ -536,7 +536,12 @@ rec {
   }:
     let
       baseName = baseNameOf name;
-      contentsEnv = symlinkJoin { name = "bulk-layers"; paths = (if builtins.isList contents then contents else [ contents ]); };
+      contentsEnv = symlinkJoin {
+        name = "bulk-layers";
+        paths = if builtins.isList contents
+          then contents
+          else [ contents ];
+      };
 
       configJson = let
           pure = writeText "${baseName}-config.json" (builtins.toJSON {