# HG changeset patch
# User Manuel Jacob <m...@manueljacob.de>
# Date 1591120869 -7200
# Tue Jun 02 20:01:09 2020 +0200
# Branch stable
# Node ID ebbc45544673c33ea3beb887ed4d5230b015102a
# Parent 91e509a12dbc4cd6cf2dcb9dae3ed383932132ac
py3: always flush ui streams on Python 3
On Python 2, we rely on that stdout and stderr are line buffered. Python 3’s
io module doesn’t offer line buffered binary streams.
diff --git a/mercurial/ui.py b/mercurial/ui.py
--- a/mercurial/ui.py
+++ b/mercurial/ui.py
@@ -1198,9 +1198,14 @@ class ui(object):
label = opts.get('label', b'')
msg = self.label(msg, label)
dest.write(msg)
+ # On Python 2, stdout and stderr are usually line buffered, but
# stderr may be buffered under win32 when redirected to files,
# including stdout.
- if dest is self._ferr and not getattr(self._ferr, 'closed', False):
+ # On Python 3, we use the underlying binary buffer, which does not
+ # support line buffering.
+ if (pycompat.ispy3 or dest is self._ferr) and not getattr(
+ self._ferr, 'closed', False
+ ):
dest.flush()
except IOError as err:
if dest is self._ferr and err.errno in (
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