From f538c07f2ebae64cc05526be65914a8212ab20b2 Mon Sep 17 00:00:00 2001
From: Dmitry Bogatov <kaction@disroot.org>
Date: Mon, 1 Nov 2021 16:15:50 -0400
Subject: [PATCH] datefudge: work correctly even if GNU date is not in PATH
 (#94045)

* datefudge: work correctly even if GNU date is not in PATH

Examples in manual assumes advanced features from date(1) like "last
Friday", which only available in GNU coreutils version of date(1)
utility. Without this patch, most examples from datefudge(1) manual will
fail in busybox environment, which is confusing.

* Apply suggestions from code review

* Update pkgs/tools/system/datefudge/default.nix

Co-authored-by: Sandro <sandro.jaeckel@gmail.com>
---
 pkgs/tools/system/datefudge/default.nix | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/pkgs/tools/system/datefudge/default.nix b/pkgs/tools/system/datefudge/default.nix
index be2ad70498ae..079b6b694360 100644
--- a/pkgs/tools/system/datefudge/default.nix
+++ b/pkgs/tools/system/datefudge/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchgit, fetchpatch }:
+{ stdenv, lib, fetchgit, fetchpatch, makeWrapper, coreutils }:
 
 stdenv.mkDerivation rec {
   pname = "datefudge";
@@ -10,6 +10,10 @@ stdenv.mkDerivation rec {
     sha256 = "1nh433yx4y4djp0bs6aawqbwk7miq7fsbs9wpjlyh2k9dvil2lrm";
   };
 
+  nativeBuildInputs = [ makeWrapper ];
+
+  buildInputs = [ coreutils ];
+
   postPatch = ''
     substituteInPlace Makefile \
      --replace "/usr" "/" \
@@ -20,7 +24,10 @@ stdenv.mkDerivation rec {
 
   installFlags = [ "DESTDIR=$(out)" ];
 
-  postInstall = "chmod +x $out/lib/datefudge/datefudge.so";
+  postInstall = ''
+    chmod +x $out/lib/datefudge/datefudge.so
+    wrapProgram $out/bin/datefudge --prefix PATH : ${coreutils}/bin
+  '';
 
   meta = with lib; {
     description = "Fake the system date";