view tests/test-stdio.py @ 45075:04ef381000a8

hooklib: fix detection of successors for changeset_obsoleted

Provide a hook for obsutil.getobsolete to be used with either a
transaction or the changes item of the transaction, since hooks only
have access to the latter. Use that to find the correct list of
revisions with obsmarkers, even new ones, and then filter out revisions
with known successors.

Move the processing from pretxnclose to txnclose as the transaction
access itself is no longer necessary. This is more in line with notify
and ensures that sanity checks can abort the transaction first.

Differential Revision: https://phab.mercurial-scm.org/D8575

#!/usr/bin/env python
"""
Tests the buffering behavior of stdio streams in `mercurial.utils.procutil`.
"""
from __future__ import absolute_import

import contextlib
import errno
import os
import subprocess
import sys
import unittest

from mercurial import pycompat


BUFFERING_CHILD_SCRIPT = r'''
import os

from mercurial import dispatch
from mercurial.utils import procutil

dispatch.initstdio()
procutil.{stream}.write(b'aaa')
os.write(procutil.{stream}.fileno(), b'[written aaa]')
procutil.{stream}.write(b'bbb\n')
os.write(procutil.{stream}.fileno(), b'[written bbb\\n]')
'''
UNBUFFERED = b'aaa[written aaa]bbb\n[written bbb\\n]'
LINE_BUFFERED = b'[written aaa]aaabbb\n[written bbb\\n]'
FULLY_BUFFERED = b'[written aaa][written bbb\\n]aaabbb\n'


@contextlib.contextmanager
def _closing(fds):
    try:
        yield
    finally:
        for fd in fds:
            try:
                os.close(fd)
            except EnvironmentError:
                pass


@contextlib.contextmanager
def _pipes():
    rwpair = os.pipe()
    with _closing(rwpair):
        yield rwpair


@contextlib.contextmanager
def _ptys():
    if pycompat.iswindows:
        raise unittest.SkipTest("PTYs are not supported on Windows")
    import pty
    import tty

    rwpair = pty.openpty()
    with _closing(rwpair):
        tty.setraw(rwpair[0])
        yield rwpair


def _readall(fd, buffer_size):
    buf = []
    while True:
        try:
            s = os.read(fd, buffer_size)
        except OSError as e:
            if e.errno == errno.EIO:
                # If the child-facing PTY got closed, reading from the
                # parent-facing PTY raises EIO.
                break
            raise
        if not s:
            break
        buf.append(s)
    return b''.join(buf)


class TestStdio(unittest.TestCase):
    def _test(self, stream, rwpair_generator, expected_output, python_args=[]):
        assert stream in ('stdout', 'stderr')
        with rwpair_generator() as (stream_receiver, child_stream), open(
            os.devnull, 'rb'
        ) as child_stdin:
            proc = subprocess.Popen(
                [sys.executable]
                + python_args
                + ['-c', BUFFERING_CHILD_SCRIPT.format(stream=stream)],
                stdin=child_stdin,
                stdout=child_stream if stream == 'stdout' else None,
                stderr=child_stream if stream == 'stderr' else None,
            )
            try:
                os.close(child_stream)
                self.assertEqual(
                    _readall(stream_receiver, 1024), expected_output
                )
            except:  # re-raises
                proc.terminate()
                raise
            finally:
                retcode = proc.wait()
            self.assertEqual(retcode, 0)

    def test_buffering_stdout_pipes(self):
        self._test('stdout', _pipes, FULLY_BUFFERED)

    def test_buffering_stdout_ptys(self):
        self._test('stdout', _ptys, LINE_BUFFERED)

    def test_buffering_stdout_pipes_unbuffered(self):
        self._test('stdout', _pipes, UNBUFFERED, python_args=['-u'])

    def test_buffering_stdout_ptys_unbuffered(self):
        self._test('stdout', _ptys, UNBUFFERED, python_args=['-u'])

    if not pycompat.ispy3 and not pycompat.iswindows:
        # On Python 2 on non-Windows, we manually open stdout in line-buffered
        # mode if connected to a TTY. We should check if Python was configured
        # to use unbuffered stdout, but it's hard to do that.
        test_buffering_stdout_ptys_unbuffered = unittest.expectedFailure(
            test_buffering_stdout_ptys_unbuffered
        )

    def test_buffering_stderr_pipes(self):
        self._test('stderr', _pipes, UNBUFFERED)

    def test_buffering_stderr_ptys(self):
        self._test('stderr', _ptys, UNBUFFERED)

    def test_buffering_stderr_pipes_unbuffered(self):
        self._test('stderr', _pipes, UNBUFFERED, python_args=['-u'])

    def test_buffering_stderr_ptys_unbuffered(self):
        self._test('stderr', _ptys, UNBUFFERED, python_args=['-u'])


if __name__ == '__main__':
    import silenttestrunner

    silenttestrunner.main(__name__)