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bd1fb8e337
Summary:
The zipimport logic requires the pyc mtime to match its source. However, the
Windows system time zone can invalidate it and cause slow startups.
Workaround it by making the zipimport mtime function return a fallback value so
the mtime check is then bypassed.
# zipimport.py, _unmarshal_code
source_mtime, source_size = \
_get_mtime_and_size_of_source(self, fullpath)
if source_mtime: # if source_mtime is false, then the check is bypassed.
# We don't use _bootstrap_external._validate_timestamp_pyc
# to allow for a more lenient timestamp check.
if (not _eq_mtime(_unpack_uint32(data[8:12]), source_mtime) or
_unpack_uint32(data[12:16]) != source_size):
_bootstrap._verbose_message(
f'bytecode is stale for {fullname!r}')
return None
Change my Windows time zone from GMT-7 to GMT-4. Set PYTHONVERBOSE and
PYTHONDEBUG to 1. Ran `hg init -h` and check its stderr. It prints:
# bytecode is stale for 'edenscm.traceimport'
and alike before this change, and no longer after replacing the `__init__.py`
in the zip with the new version.
Reviewed By: DurhamG
Differential Revision: D28622287
fbshipit-source-id: bb3e8e378ea168e4f83f4b6aa9713103b2c90ef8
101 lines
3.1 KiB
Python
101 lines
3.1 KiB
Python
# Copyright (c) Facebook, Inc. and its affiliates.
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2.
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from __future__ import absolute_import
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def _fixsys():
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"""Fix sys.path so core edenscm modules (edenscmnative, and 3rd party
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libraries) are in sys.path
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Fix sys.stdin if it's None.
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"""
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import os
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# Do not expose those modules to edenscm.__dict__
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import sys
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dirname = os.path.dirname
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# __file__ is "hg/edenscm/__init__.py"
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# libdir is "hg/"
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# Do not follow symlinks (ex. do not use "realpath"). It breaks buck build.
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libdir = dirname(dirname(os.path.abspath(__file__)))
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# Make "edenscmdeps.zip" available in sys.path. It includes 3rd party
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# pure-Python libraries like IPython, thrift runtime, etc.
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#
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# Note: On Windows, the released version of hg uses python27.zip for all
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# pure Python modules including edenscm and everything in edenscmdeps.zip,
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# so not being able to locate edenscmdeps.zip is not fatal.
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if sys.version_info[0] == 3:
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name = "edenscmdeps3.zip"
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else:
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name = "edenscmdeps.zip"
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for candidate in [libdir, os.path.join(libdir, "build")]:
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depspath = os.path.join(candidate, name)
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if os.path.exists(depspath) and depspath not in sys.path:
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sys.path.insert(0, depspath)
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# Make sure "edenscmnative" can be imported. Error early.
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import edenscmnative
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edenscmnative.__name__
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# stdin can be None if the parent process unset the stdin file descriptor.
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# Replace it early, since it may be read in layer modules, like pycompat.
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if sys.stdin is None:
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sys.stdin = open(os.devnull, "r")
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# On Windows, the system time zone setting, if does not match the time
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# zone from the package building machine, can cause pyc to be invalidated
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# in a zip file. Workaround it by bypassing the mtime check.
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if os.name == "nt" and sys.version_info[0] == 3:
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import zipimport
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zipimport._get_mtime_and_size_of_source = lambda _s, _p: (0, 0)
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_fixsys()
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# Keep the module clean
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del globals()["_fixsys"]
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def run(args=None, fin=None, fout=None, ferr=None):
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import sys
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if args is None:
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args = sys.argv
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if args[1:4] == ["serve", "--cmdserver", "chgunix2"]:
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# chgserver code path
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# no demandimport, since chgserver wants to preimport everything.
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from .mercurial import dispatch
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dispatch.runchgserver()
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else:
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# non-chgserver code path
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# - no chg in use: hgcommands::run -> HgPython::run_hg -> here
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# - chg client: chgserver.runcommand -> bindings.commands.run ->
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# hgcommands::run -> HgPython::run_hg -> here
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from . import traceimport
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traceimport.enable()
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# enable demandimport after enabling traceimport
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from . import hgdemandimport
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hgdemandimport.enable()
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# demandimport has side effect on importing dispatch.
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# so 'import dispatch' happens after demandimport
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from .mercurial import dispatch
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dispatch.run(args, fin, fout, ferr)
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