# HG changeset patch
# User Pulkit Goyal <7895pulkit@gmail.com>
# Date 2020-12-10 08:33:46
# Node ID 7ce24d3761e8bd09b0d3772c66ab435fc472051c
# Parent  49b6910217f907ef75069f70eb4c7c392418b11a

procutil: don't assign stdin to None, use os.devnull instead

It will be painful to take care of procutil.stdin being None everywhere.

Thanks to Yuya who recommended it.

diff --git a/mercurial/utils/procutil.py b/mercurial/utils/procutil.py
--- a/mercurial/utils/procutil.py
+++ b/mercurial/utils/procutil.py
@@ -126,7 +126,11 @@ if pycompat.ispy3:
     # a silly wrapper to make a bytes stream backed by a unicode one.
 
     # sys.stdin can be None
-    stdin = sys.stdin.buffer if sys.stdin else sys.stdin
+    if sys.stdin:
+        stdin = sys.stdin.buffer
+    else:
+        stdin = open(os.devnull, 'rb')
+        os.close(stdin.fileno())
     stdout = _make_write_all(sys.stdout.buffer)
     stderr = _make_write_all(sys.stderr.buffer)
     if pycompat.iswindows: