From a9d90273d8273a13364269111fc76afc2783a327 Mon Sep 17 00:00:00 2001
From: Pavol Rusnak <pavol@rusnak.io>
Date: Fri, 1 May 2020 21:36:01 +0200
Subject: [PATCH] gzip: add setup-hook to stop gzip from adding timestamps to
 headers

---
 pkgs/tools/compression/gzip/default.nix | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/pkgs/tools/compression/gzip/default.nix b/pkgs/tools/compression/gzip/default.nix
index 65760a0b6ccd..eb680ff8a061 100644
--- a/pkgs/tools/compression/gzip/default.nix
+++ b/pkgs/tools/compression/gzip/default.nix
@@ -1,4 +1,8 @@
-{ stdenv, fetchurl, xz }:
+{ stdenv
+, fetchurl
+, xz
+, writeText
+}:
 
 stdenv.mkDerivation rec {
   pname = "gzip";
@@ -26,6 +30,12 @@ stdenv.mkDerivation rec {
     }' $out/bin/*
   '';
 
+  # set GZIP env variable to "-n" to stop gzip from adding timestamps
+  # to archive headers: https://github.com/NixOS/nixpkgs/issues/86348
+  setupHook = writeText "setup-hook" ''
+    export GZIP="-n"
+  '';
+
   meta = {
     homepage = "https://www.gnu.org/software/gzip/";
     description = "GNU zip compression program";