# HG changeset patch
# User Yuya Nishihara <yuya@tcha.org>
# Date 2021-02-04 10:56:45
# Node ID 128a17d8436fcdf04139739d8a38a270defef99a
# Parent  33dbc9f785e719fb583e8e3c2984634258f1fd77

procutil: extend gui test to detect wayland session (issue6479)

diff --git a/mercurial/utils/procutil.py b/mercurial/utils/procutil.py
--- a/mercurial/utils/procutil.py
+++ b/mercurial/utils/procutil.py
@@ -546,7 +546,11 @@ def _gui():
             # pure build; use a safe default
             return True
     else:
-        return pycompat.iswindows or encoding.environ.get(b"DISPLAY")
+        return (
+            pycompat.iswindows
+            or encoding.environ.get(b"DISPLAY")
+            or encoding.environ.get(b"WAYLAND_DISPLAY")
+        )
 
 
 def gui():