From 6ee471d878a0242bfcf7ee053162818067dcce8a Mon Sep 17 00:00:00 2001
From: Claudius Kienle <privat@claudiuskienle.de>
Date: Thu, 18 Jan 2024 12:41:20 +0100
Subject: [PATCH] fix truncate size nullable (#789)
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Co-authored-by: Itamar Turner-Trauring <itamar@itamarst.org>
Co-authored-by: Hervé Beraud <hberaud@redhat.com>
---
 eventlet/greenio/py3.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/eventlet/greenio/py3.py b/eventlet/greenio/py3.py
index 5b84c8b10..941f49cff 100644
--- a/eventlet/greenio/py3.py
+++ b/eventlet/greenio/py3.py
@@ -158,6 +158,8 @@ def close(self):
             setattr(self, method, _operation_on_closed_file)
 
     def truncate(self, size=-1):
+        if size is None:
+            size = -1
         if size == -1:
             size = self.tell()
         try: