author | Manuel Jacob <me@manueljacob.de> |
Sun, 05 Jul 2020 13:09:22 +0200 | |
changeset 45045 | 8403cc54bc83 |
parent 45044 | 359884685eab |
child 45068 | 8cd18aba5e6c |
permissions | -rwxr-xr-x |
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#!/usr/bin/env python |
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""" |
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Tests the buffering behavior of stdio streams in `mercurial.utils.procutil`. |
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""" |
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from __future__ import absolute_import |
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import contextlib |
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import os |
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import subprocess |
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import sys |
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import unittest |
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from mercurial import pycompat |
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CHILD_PROCESS = r''' |
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import os |
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from mercurial import dispatch |
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from mercurial.utils import procutil |
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dispatch.initstdio() |
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procutil.{stream}.write(b'aaa') |
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os.write(procutil.{stream}.fileno(), b'[written aaa]') |
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procutil.{stream}.write(b'bbb\n') |
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os.write(procutil.{stream}.fileno(), b'[written bbb\\n]') |
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''' |
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UNBUFFERED = b'aaa[written aaa]bbb\n[written bbb\\n]' |
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LINE_BUFFERED = b'[written aaa]aaabbb\n[written bbb\\n]' |
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FULLY_BUFFERED = b'[written aaa][written bbb\\n]aaabbb\n' |
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@contextlib.contextmanager |
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def _closing(fds): |
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try: |
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yield |
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finally: |
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for fd in fds: |
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try: |
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os.close(fd) |
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except EnvironmentError: |
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pass |
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@contextlib.contextmanager |
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def _pipes(): |
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rwpair = os.pipe() |
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with _closing(rwpair): |
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yield rwpair |
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@contextlib.contextmanager |
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def _ptys(): |
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if pycompat.iswindows: |
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raise unittest.SkipTest("PTYs are not supported on Windows") |
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import pty |
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import tty |
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rwpair = pty.openpty() |
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with _closing(rwpair): |
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tty.setraw(rwpair[0]) |
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yield rwpair |
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class TestStdio(unittest.TestCase): |
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def _test(self, stream, rwpair_generator, expected_output, python_args=[]): |
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assert stream in ('stdout', 'stderr') |
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with rwpair_generator() as (stream_receiver, child_stream), open( |
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os.devnull, 'rb' |
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) as child_stdin: |
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proc = subprocess.Popen( |
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[sys.executable] |
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+ python_args |
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+ ['-c', CHILD_PROCESS.format(stream=stream)], |
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stdin=child_stdin, |
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stdout=child_stream if stream == 'stdout' else None, |
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stderr=child_stream if stream == 'stderr' else None, |
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) |
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retcode = proc.wait() |
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self.assertEqual(retcode, 0) |
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self.assertEqual(os.read(stream_receiver, 1024), expected_output) |
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def test_stdout_pipes(self): |
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self._test('stdout', _pipes, FULLY_BUFFERED) |
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def test_stdout_ptys(self): |
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self._test('stdout', _ptys, LINE_BUFFERED) |
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def test_stdout_pipes_unbuffered(self): |
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self._test('stdout', _pipes, UNBUFFERED, python_args=['-u']) |
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def test_stdout_ptys_unbuffered(self): |
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self._test('stdout', _ptys, UNBUFFERED, python_args=['-u']) |
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if not pycompat.ispy3 and not pycompat.iswindows: |
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# On Python 2 on non-Windows, we manually open stdout in line-buffered |
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# mode if connected to a TTY. We should check if Python was configured |
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# to use unbuffered stdout, but it's hard to do that. |
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test_stdout_ptys_unbuffered = unittest.expectedFailure( |
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test_stdout_ptys_unbuffered |
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) |
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def test_stderr_pipes(self): |
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self._test('stderr', _pipes, UNBUFFERED) |
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def test_stderr_ptys(self): |
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self._test('stderr', _ptys, UNBUFFERED) |
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def test_stderr_pipes_unbuffered(self): |
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self._test('stderr', _pipes, UNBUFFERED, python_args=['-u']) |
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111 |
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def test_stderr_ptys_unbuffered(self): |
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self._test('stderr', _ptys, UNBUFFERED, python_args=['-u']) |
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if __name__ == '__main__': |
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import silenttestrunner |
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silenttestrunner.main(__name__) |