From a03b2b99af92a97198c903436823d3135a5f6e49 Mon Sep 17 00:00:00 2001
From: Michael Weiss <dev.primeos@gmail.com>
Date: Mon, 22 Jan 2018 22:17:09 +0100
Subject: [PATCH] tdesktop: Fix the execution in a pure environment

Telegram was crashing when executed within a pure environment
(nix-shell -p tdesktop --pure).
Setting the environment variables QT_PLUGIN_PATH and XDG_RUNTIME_DIR
should resolve this issue. Fix #33729.
---
 .../instant-messengers/telegram/tdesktop/default.nix  | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/pkgs/applications/networking/instant-messengers/telegram/tdesktop/default.nix b/pkgs/applications/networking/instant-messengers/telegram/tdesktop/default.nix
index 82302ad5db39..c4158d280e2b 100644
--- a/pkgs/applications/networking/instant-messengers/telegram/tdesktop/default.nix
+++ b/pkgs/applications/networking/instant-messengers/telegram/tdesktop/default.nix
@@ -1,5 +1,5 @@
 { mkDerivation, lib, fetchgit, fetchpatch
-, pkgconfig, gyp, cmake, gcc7
+, pkgconfig, gyp, cmake, gcc7, makeWrapper
 , qtbase, qtimageformats, gtk3, libappindicator-gtk3
 , dee, ffmpeg, openalSoft, minizip, libopus, alsaLib, libpulseaudio, range-v3
 }:
@@ -31,7 +31,7 @@ mkDerivation rec {
     })
   ];
 
-  nativeBuildInputs = [ pkgconfig gyp cmake gcc7 ];
+  nativeBuildInputs = [ pkgconfig gyp cmake gcc7 makeWrapper ];
 
   buildInputs = [
     qtbase qtimageformats gtk3 libappindicator-gtk3
@@ -107,6 +107,13 @@ mkDerivation rec {
     for icon_size in 16 32 48 64 128 256 512; do
       install -Dm644 "../../../Telegram/Resources/art/icon''${icon_size}.png" "$out/share/icons/hicolor/''${icon_size}x''${icon_size}/apps/telegram-desktop.png"
     done
+
+    # This is necessary to run Telegram in a pure environment.
+    wrapProgram $out/bin/telegram-desktop \
+      --prefix QT_PLUGIN_PATH : "${qtbase}/${qtbase.qtPluginPrefix}" \
+      --set XDG_RUNTIME_DIR "XDG-RUNTIME-DIR"
+    sed -i $out/bin/telegram-desktop \
+      -e "s,'XDG-RUNTIME-DIR',\"\''${XDG_RUNTIME_DIR:-/run/user/\$(id --user)}\","
   '';
 
   meta = with lib; {