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authplugin-example.py: Flush stderr.

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Python 3's stderr was fully-buffered when non-interactive, unlike
Python 2 and more or less everything else, until 3.9 in 2020(!):
https://bugs.python.org/issue13601

(It would be less faff to sys.stderr.reconfigure(line_buffering=True)
at the start, but that was only added in 3.7, whereas the 'flush'
argument to print() dates back to 3.3, so I chose that to minimise
the risk of version dependencies getting in the way of using this as
a working example.)

(cherry picked from commit 329a4cdd79)
This commit is contained in:
Jacob Nevins 2022-10-24 12:45:37 +01:00 committed by Simon Tatham
parent 5a50288718
commit fe11c1e498
1 changed files with 3 additions and 2 deletions
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5
contrib/authplugin-example.py
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@ -136,7 +136,8 @@ def protocol():
hostname = rd_string_utf8(msg) hostname = rd_string_utf8(msg)
port = rd_uint32(msg) port = rd_uint32(msg)
username = rd_string_utf8(msg) username = rd_string_utf8(msg)
print(f"Got hostname {hostname!r}, port {port!r}", file=sys.stderr) print(f"Got hostname {hostname!r}, port {port!r}", file=sys.stderr,
flush=True)
# Decide which protocol version we're speaking. # Decide which protocol version we're speaking.
version = min(their_version, our_max_version) version = min(their_version, our_max_version)
@ -281,7 +282,7 @@ def protocol():
# Demonstration write to stderr, to prove that it shows up in PuTTY's # Demonstration write to stderr, to prove that it shows up in PuTTY's
# Event Log. # Event Log.
print("Hello from test plugin's stderr", file=sys.stderr) print("Hello from test plugin's stderr", file=sys.stderr, flush=True)
try: try:
protocol() protocol()