view hgdemandimport/__init__.py @ 51998:629ecced55a6

tests: fix hooks in `test-transaction-rollback-on-revlog-split.t` for Windows

A few problems with external hooks here:

  1) `cmd.exe` is blissfully unaware of the meaning of single quotes, and passes
     them along as part of the revision arg
  2) `cmd.exe` doesn't know how to run the python script `f` with the shebang
     line, so it needs to be invoked with the intepreter explicitly.  Then for
     some reason it was trying to open `$TESTTMP\troffset-computation-hooks\f`,
     so make it an absolute path.
  3) Likewise, the shell script `wait-on-file` cannot be invoked directly by
     `cmd.exe`.
  4) Windows python doesn't understand whatever `$TESTTMP` unrolls to (probably
     it has the double backslashes), and silently failed to write the lock file.

I'm assuming that `pretxnclose.03-abort` is also bad (there's no `false` in
`cmd.exe`), but it's not currently causing problems.

Also note that the paths in this are very long, and typically exceed the
`MAX_PATH` limit in Windows.  It can be run with `run-tests.py --tmpdir /c/t`.

# hgdemandimport - global demand-loading of modules for Mercurial
#
# Copyright 2017 Facebook Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

'''demandimport - automatic demand-loading of modules'''

# This is in a separate package from mercurial because in Python 3,
# demand loading is per-package. Keeping demandimport in the mercurial package
# would disable demand loading for any modules in mercurial.

from __future__ import annotations

import os
import sys

from . import demandimportpy3 as demandimport

# Full module names which can't be lazy imported.
# Extensions can add to this set.
IGNORES = {
    '__future__',
    '_hashlib',
    # ImportError during pkg_resources/__init__.py:fixup_namespace_package
    '_imp',
    '_xmlplus',
    'fcntl',
    'nt',  # pathlib2 tests the existence of built-in 'nt' module
    'win32com.gen_py',
    'win32com.shell',  # 'appdirs' tries to import win32com.shell
    '_winreg',  # 2.7 mimetypes needs immediate ImportError
    'pythoncom',
    # imported by tarfile, not available under Windows
    'pwd',
    'grp',
    # imported by profile, itself imported by hotshot.stats,
    # not available under Windows
    'resource',
    # this trips up many extension authors
    'gtk',
    # setuptools' pkg_resources.py expects "from __main__ import x" to
    # raise ImportError if x not defined
    '__main__',
    '_ast',  # https://bugs.python.org/issue41631
    '_ssl',  # conditional imports in the stdlib, issue1964
    '_sre',  # issue4920
    'rfc822',
    'mimetools',
    'sqlalchemy.events',  # has import-time side effects (issue5085)
    'sqlalchemy.dialects',  # similar problems as above
    # setuptools 8 expects this module to explode early when not on windows
    'distutils.msvc9compiler',
    '__builtin__',
    'builtins',
    'urwid.command_map',  # for pudb
    'lzma',
    # setuptools uses this hack to inject it's own distutils at import time
    'setuptools',
    '_distutils_hack.override',
    # threading is locally imported by importlib.util.LazyLoader.exec_module
    '_weakrefset',
    'warnings',
    'threading',
}

_pypy = '__pypy__' in sys.builtin_module_names

if _pypy:
    # _ctypes.pointer is shadowed by "from ... import pointer" (PyPy 5)
    IGNORES.add('_ctypes.pointer')
    # pure Python module on PyPy, must be loaded to raise ModuleNotFoundError
    # on non-Windows platforms
    IGNORES.add('msvcrt')

demandimport.init(IGNORES)

# Re-export.
isenabled = demandimport.isenabled
disable = demandimport.disable
deactivated = demandimport.deactivated


def enable():
    # chg pre-imports modules so do not enable demandimport for it
    if (
        'CHGINTERNALMARK' not in os.environ
        and os.environ.get('HGDEMANDIMPORT') != 'disable'
    ):
        demandimport.enable()