Mercurial > hg
annotate mercurial/policy.py @ 48530:61fe7e17f21b
discovery: remove deprecated API
Differential Revision: https://phab.mercurial-scm.org/D11952
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Thu, 23 Dec 2021 14:49:05 +0100 |
parents | 9d1a8829f959 |
children | 6000f5b25c9b |
rev | line source |
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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 |
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137 If either the module or its member is not available, this returns `default` |
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138 if policy is permissive and raises `ImportError` if not. |
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139 """ |
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140 if not policy.startswith(b'rust'): |
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141 return default |
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142 |
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143 try: |
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144 mod = _importfrom('rustext', modname) |
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145 except ImportError: |
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146 if _isrustpermissive(): |
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147 return default |
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148 raise |
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149 if member is None: |
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150 return mod |
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151 |
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152 try: |
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153 return getattr(mod, member) |
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154 except AttributeError: |
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155 if _isrustpermissive(): |
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156 return default |
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157 raise ImportError("Cannot import name %s" % member) |