annotate mercurial/policy.py @ 48599:dfbfa802876b

requirements: move "bookmark in store" requirements in the right module There seems to be no reasons to not have it with the others. Differential Revision: https://phab.mercurial-scm.org/D12030
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Mon, 17 Jan 2022 19:18:20 +0100
parents 9d1a8829f959
children 6000f5b25c9b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # policy.py - module policy logic for Mercurial.
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2 #
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3 # Copyright 2015 Gregory Szorc <gregory.szorc@gmail.com>
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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 from __future__ import absolute_import
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9
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10 import os
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11 import sys
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12
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13 from .pycompat import getattr
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14
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15 # Rules for how modules can be loaded. Values are:
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16 #
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17 # c - require C extensions
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18 # rust+c - require Rust and C extensions
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19 # rust+c-allow - allow Rust and C extensions with fallback to pure Python
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20 # for each
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21 # allow - allow pure Python implementation when C loading fails
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22 # cffi - required cffi versions (implemented within pure module)
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23 # cffi-allow - allow pure Python implementation if cffi version is missing
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24 # py - only load pure Python modules
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25 #
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26 # By default, fall back to the pure modules so the in-place build can
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27 # run without recompiling the C extensions. This will be overridden by
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28 # __modulepolicy__ generated by setup.py.
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29 policy = b'allow'
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30 _packageprefs = {
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31 # policy: (versioned package, pure package)
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32 b'c': ('cext', None),
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33 b'allow': ('cext', 'pure'),
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34 b'cffi': ('cffi', None),
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35 b'cffi-allow': ('cffi', 'pure'),
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36 b'py': (None, 'pure'),
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37 # For now, rust policies impact importrust only
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38 b'rust+c': ('cext', None),
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39 b'rust+c-allow': ('cext', 'pure'),
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40 }
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41
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42 try:
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43 from . import __modulepolicy__
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44
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45 policy = __modulepolicy__.modulepolicy
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46 except ImportError:
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47 pass
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48
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49 # PyPy doesn't load C extensions.
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50 #
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51 # The canonical way to do this is to test platform.python_implementation().
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52 # But we don't import platform and don't bloat for it here.
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53 if '__pypy__' in sys.builtin_module_names:
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54 policy = b'cffi'
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55
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56 # Environment variable can always force settings.
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57 if sys.version_info[0] >= 3:
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58 if 'HGMODULEPOLICY' in os.environ:
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59 policy = os.environ['HGMODULEPOLICY'].encode('utf-8')
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60 else:
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61 policy = os.environ.get('HGMODULEPOLICY', policy)
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62
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63
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64 def _importfrom(pkgname, modname):
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65 # from .<pkgname> import <modname> (where . is looked through this module)
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66 fakelocals = {}
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67 pkg = __import__(pkgname, globals(), fakelocals, [modname], level=1)
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68 try:
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69 fakelocals[modname] = mod = getattr(pkg, modname)
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70 except AttributeError:
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71 raise ImportError('cannot import name %s' % modname)
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72 # force import; fakelocals[modname] may be replaced with the real module
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73 getattr(mod, '__doc__', None)
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74 return fakelocals[modname]
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75
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76
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77 # keep in sync with "version" in C modules
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78 _cextversions = {
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79 ('cext', 'base85'): 1,
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80 ('cext', 'bdiff'): 3,
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81 ('cext', 'mpatch'): 1,
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82 ('cext', 'osutil'): 4,
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83 ('cext', 'parsers'): 20,
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84 }
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85
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86 # map import request to other package or module
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87 _modredirects = {
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88 ('cext', 'charencode'): ('cext', 'parsers'),
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89 ('cffi', 'base85'): ('pure', 'base85'),
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90 ('cffi', 'charencode'): ('pure', 'charencode'),
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91 ('cffi', 'parsers'): ('pure', 'parsers'),
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92 }
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93
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94
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95 def _checkmod(pkgname, modname, mod):
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96 expected = _cextversions.get((pkgname, modname))
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97 actual = getattr(mod, 'version', None)
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98 if actual != expected:
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99 raise ImportError(
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100 'cannot import module %s.%s '
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101 '(expected version: %d, actual: %r)'
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102 % (pkgname, modname, expected, actual)
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103 )
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104
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105
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106 def importmod(modname):
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107 """Import module according to policy and check API version"""
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108 try:
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109 verpkg, purepkg = _packageprefs[policy]
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110 except KeyError:
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111 raise ImportError('invalid HGMODULEPOLICY %r' % policy)
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112 assert verpkg or purepkg
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113 if verpkg:
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114 pn, mn = _modredirects.get((verpkg, modname), (verpkg, modname))
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115 try:
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116 mod = _importfrom(pn, mn)
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117 if pn == verpkg:
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118 _checkmod(pn, mn, mod)
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119 return mod
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120 except ImportError:
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121 if not purepkg:
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122 raise
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123 pn, mn = _modredirects.get((purepkg, modname), (purepkg, modname))
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124 return _importfrom(pn, mn)
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125
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126
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127 def _isrustpermissive():
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128 """Assuming the policy is a Rust one, tell if it's permissive."""
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129 return policy.endswith(b'-allow')
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130
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131
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132 def importrust(modname, member=None, default=None):
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133 """Import Rust module according to policy and availability.
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134
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135 If policy isn't a Rust one, this returns `default`.
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136
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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137 If either the module or its member is not available, this returns `default`
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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138 if policy is permissive and raises `ImportError` if not.
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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139 """
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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140 if not policy.startswith(b'rust'):
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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141 return default
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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142
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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143 try:
43506
9f70512ae2cf cleanup: remove pointless r-prefixes on single-quoted strings
Augie Fackler <augie@google.com>
parents: 43503
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144 mod = _importfrom('rustext', modname)
42451
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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145 except ImportError:
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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146 if _isrustpermissive():
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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147 return default
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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148 raise
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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149 if member is None:
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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150 return mod
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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151
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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152 try:
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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153 return getattr(mod, member)
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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154 except AttributeError:
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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155 if _isrustpermissive():
810f66b468cd rust: module policy with importrust
Georges Racinet <georges.racinet@octobus.net>
parents: 42343
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156 return default
43503
313e3a279828 cleanup: remove pointless r-prefixes on double-quoted strings
Augie Fackler <augie@google.com>
parents: 43103
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157 raise ImportError("Cannot import name %s" % member)