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streamclone: disable the volatile file open handle optimization on Windows...
streamclone: disable the volatile file open handle optimization on Windows Leaving files open caused new failures like this, since a47f09da8bd1: diff --git a/tests/test-persistent-nodemap-stream-clone.t b/tests/test-persistent-nodemap-stream-clone.t --- a/tests/test-persistent-nodemap-stream-clone.t +++ b/tests/test-persistent-nodemap-stream-clone.t @@ -115,7 +115,12 @@ Do a mix of clone and commit at the same $ (hg clone -U --stream ssh://user@dummy/test-repo stream-clone-race-1 --debug 2>> clone-output | grep -E '00(changelog|manifest)' >> clone-output; touch $HG_TEST_STREAM_WALKED_FILE_3) & $ $RUNTESTDIR/testlib/wait-on-file 10 $HG_TEST_STREAM_WALKED_FILE_1 $ hg -R test-repo/ commit -m foo - created new head + transaction abort! + failed to recover 00changelog.n ([WinError 32] The process cannot access the file because it is being used by another process: b'$STR_REPR_TESTTMP\\test-repo/.hg/store/00changelog.n' -> b'$STR_REPR_TESTTMP\\test-repo/.hg/store/00changelog.n-f418dcd6') + rollback failed - please run hg recover + (failure reason: [WinError 32] The process cannot access the file because it is being used by another process: b'$STR_REPR_TESTTMP\\test-repo/.hg/store/00changelog.n' -> b'$STR_REPR_TESTTMP\\test-repo/.hg/store/00changelog.n-f418dcd6') + abort: The process cannot access the file because it is being used by another process: '$TESTTMP\test-repo\.hg\store\00changelog.n' + [255] $ touch $HG_TEST_STREAM_WALKED_FILE_2 $ $RUNTESTDIR/testlib/wait-on-file 10 $HG_TEST_STREAM_WALKED_FILE_3 $ cat clone-output Since the `VolatileManager` falls back to the old copy method when the open file threshold is exceeded, this just drops the threshold so that only 1 file is open. The actual value used (2) is unexpected, and explained inline. I'd like to have a config option for this so that we can test both ways (in theory, it could resort to copies on non-Windows systems too), but I don't see a `uimod.ui` handy. Alternately, I tried replacing the 3 `open()` calls in the `VolatileManager` with `util.posixfile()`, but that simply hung the test on Windows for some reason, I think on the same line that's indicated as failing above. (There was a `grep` command hanging around, as well as `hg -R test-repo serve --stdio`.)
Gregory Szorc - - Load All Authors

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__init__.py
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/ contrib / python-zstandard / zstandard / __init__.py
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# Copyright (c) 2017-present, Gregory Szorc
# All rights reserved.
#
# This software may be modified and distributed under the terms
# of the BSD license. See the LICENSE file for details.
"""Python interface to the Zstandard (zstd) compression library."""
# This module serves 2 roles:
#
# 1) Export the C or CFFI "backend" through a central module.
# 2) Implement additional functionality built on top of C or CFFI backend.
import os
import platform
# Some Python implementations don't support C extensions. That's why we have
# a CFFI implementation in the first place. The code here import one of our
# "backends" then re-exports the symbols from this module. For convenience,
# we support falling back to the CFFI backend if the C extension can't be
# imported. But for performance reasons, we only do this on unknown Python
# implementation. Notably, for CPython we require the C extension by default.
# Because someone will inevitably want special behavior, the behavior is
# configurable via an environment variable. A potentially better way to handle
# this is to import a special ``__importpolicy__`` module or something
# defining a variable and `setup.py` could write the file with whatever
# policy was specified at build time. Until someone needs it, we go with
# the hacky but simple environment variable approach.
_module_policy = os.environ.get("PYTHON_ZSTANDARD_IMPORT_POLICY", "default")
if _module_policy == "default":
if platform.python_implementation() in ("CPython",):
from zstd import *
backend = "cext"
elif platform.python_implementation() in ("PyPy",):
from .cffi import *
backend = "cffi"
else:
try:
from zstd import *
backend = "cext"
except ImportError:
from .cffi import *
backend = "cffi"
elif _module_policy == "cffi_fallback":
try:
from zstd import *
backend = "cext"
except ImportError:
from .cffi import *
backend = "cffi"
elif _module_policy == "cext":
from zstd import *
backend = "cext"
elif _module_policy == "cffi":
from .cffi import *
backend = "cffi"
else:
raise ImportError(
"unknown module import policy: %s; use default, cffi_fallback, "
"cext, or cffi" % _module_policy
)
# Keep this in sync with python-zstandard.h.
__version__ = "0.13.0"