annotate hgdemandimport/__init__.py @ 44894:39c598f1c774

sslutil: remove comment referring to unsupported legacy stacks
author Manuel Jacob <me@manueljacob.de>
date Fri, 29 May 2020 22:47:58 +0200
parents 2372284d9457
children 40120de810ba
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1 # hgdemandimport - global demand-loading of modules for Mercurial
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2 #
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3 # Copyright 2017 Facebook Inc.
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 '''demandimport - automatic demand-loading of modules'''
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9
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10 # This is in a separate package from mercurial because in Python 3,
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11 # demand loading is per-package. Keeping demandimport in the mercurial package
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12 # would disable demand loading for any modules in mercurial.
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13
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14 from __future__ import absolute_import
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15
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16 import os
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17 import sys
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18
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19 if sys.version_info[0] >= 3:
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20 from . import demandimportpy3 as demandimport
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21 else:
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22 from . import demandimportpy2 as demandimport
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23
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24 # Full module names which can't be lazy imported.
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25 # Extensions can add to this set.
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26 IGNORES = {
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27 '__future__',
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28 '_hashlib',
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29 # ImportError during pkg_resources/__init__.py:fixup_namespace_package
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30 '_imp',
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31 '_xmlplus',
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32 'fcntl',
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33 'nt', # pathlib2 tests the existence of built-in 'nt' module
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34 'win32com.gen_py',
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35 'win32com.shell', # 'appdirs' tries to import win32com.shell
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36 '_winreg', # 2.7 mimetypes needs immediate ImportError
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37 'pythoncom',
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38 # imported by tarfile, not available under Windows
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39 'pwd',
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40 'grp',
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41 # imported by profile, itself imported by hotshot.stats,
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42 # not available under Windows
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43 'resource',
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44 # this trips up many extension authors
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45 'gtk',
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46 # setuptools' pkg_resources.py expects "from __main__ import x" to
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47 # raise ImportError if x not defined
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48 '__main__',
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49 '_ssl', # conditional imports in the stdlib, issue1964
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50 '_sre', # issue4920
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51 'rfc822',
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52 'mimetools',
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53 'sqlalchemy.events', # has import-time side effects (issue5085)
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54 # setuptools 8 expects this module to explode early when not on windows
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55 'distutils.msvc9compiler',
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56 '__builtin__',
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57 'builtins',
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58 'urwid.command_map', # for pudb
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59 }
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60
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61 _pypy = '__pypy__' in sys.builtin_module_names
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62
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63 if _pypy:
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64 # _ctypes.pointer is shadowed by "from ... import pointer" (PyPy 5)
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65 IGNORES.add('_ctypes.pointer')
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66
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67 demandimport.init(IGNORES)
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68
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69 # Re-export.
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70 isenabled = demandimport.isenabled
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71 disable = demandimport.disable
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72 deactivated = demandimport.deactivated
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73
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74
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75 def enable():
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76 # chg pre-imports modules so do not enable demandimport for it
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77 if (
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78 'CHGINTERNALMARK' not in os.environ
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79 and os.environ.get('HGDEMANDIMPORT') != 'disable'
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80 ):
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81 demandimport.enable()