Mercurial > hg
annotate mercurial/policy.py @ 50076:63c4e9639753
dirstate: generalize the dirstate's invalidation on transaction abort
The previous code was too specific, we should add the invalidation at next to
the `addfilegenerator` in the `write` call.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Thu, 16 Feb 2023 02:34:54 +0100 |
parents | 3eac92509484 |
children | 18c8c18993f0 |
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 |
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9 import os |
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10 import sys |
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11 |
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12 from .pycompat import getattr |
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13 |
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14 # Rules for how modules can be loaded. Values are: |
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15 # |
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16 # c - require C extensions |
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17 # rust+c - require Rust and C extensions |
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18 # rust+c-allow - allow Rust and C extensions with fallback to pure Python |
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19 # for each |
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20 # allow - allow pure Python implementation when C loading fails |
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21 # cffi - required cffi versions (implemented within pure module) |
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22 # cffi-allow - allow pure Python implementation if cffi version is missing |
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23 # py - only load pure Python modules |
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24 # |
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25 # By default, fall back to the pure modules so the in-place build can |
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26 # run without recompiling the C extensions. This will be overridden by |
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27 # __modulepolicy__ generated by setup.py. |
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28 policy = b'allow' |
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29 _packageprefs = { |
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30 # policy: (versioned package, pure package) |
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31 b'c': ('cext', None), |
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32 b'allow': ('cext', 'pure'), |
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33 b'cffi': ('cffi', None), |
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34 b'cffi-allow': ('cffi', 'pure'), |
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35 b'py': (None, 'pure'), |
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36 # For now, rust policies impact importrust only |
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37 b'rust+c': ('cext', None), |
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38 b'rust+c-allow': ('cext', 'pure'), |
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39 } |
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40 |
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41 try: |
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42 from . import __modulepolicy__ |
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43 |
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44 policy = __modulepolicy__.modulepolicy |
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45 except ImportError: |
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46 pass |
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47 |
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48 # PyPy doesn't load C extensions. |
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49 # |
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50 # The canonical way to do this is to test platform.python_implementation(). |
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51 # But we don't import platform and don't bloat for it here. |
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52 if '__pypy__' in sys.builtin_module_names: |
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53 policy = b'cffi' |
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54 |
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55 # Environment variable can always force settings. |
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56 if 'HGMODULEPOLICY' in os.environ: |
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57 policy = os.environ['HGMODULEPOLICY'].encode('utf-8') |
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58 |
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59 |
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60 def _importfrom(pkgname, modname): |
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61 # from .<pkgname> import <modname> (where . is looked through this module) |
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62 fakelocals = {} |
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63 pkg = __import__(pkgname, globals(), fakelocals, [modname], level=1) |
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64 try: |
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65 fakelocals[modname] = mod = getattr(pkg, modname) |
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66 except AttributeError: |
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67 raise ImportError('cannot import name %s' % modname) |
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68 # force import; fakelocals[modname] may be replaced with the real module |
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69 getattr(mod, '__doc__', None) |
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70 return fakelocals[modname] |
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71 |
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72 |
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73 # keep in sync with "version" in C modules |
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74 _cextversions = { |
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75 ('cext', 'base85'): 1, |
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76 ('cext', 'bdiff'): 3, |
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77 ('cext', 'mpatch'): 1, |
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78 ('cext', 'osutil'): 4, |
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79 ('cext', 'parsers'): 21, |
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80 } |
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81 |
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82 # map import request to other package or module |
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83 _modredirects = { |
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84 ('cext', 'charencode'): ('cext', 'parsers'), |
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85 ('cffi', 'base85'): ('pure', 'base85'), |
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86 ('cffi', 'charencode'): ('pure', 'charencode'), |
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87 ('cffi', 'parsers'): ('pure', 'parsers'), |
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88 } |
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89 |
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90 |
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91 def _checkmod(pkgname, modname, mod): |
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92 expected = _cextversions.get((pkgname, modname)) |
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93 actual = getattr(mod, 'version', None) |
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94 if actual != expected: |
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95 raise ImportError( |
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96 'cannot import module %s.%s ' |
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97 '(expected version: %d, actual: %r)' |
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98 % (pkgname, modname, expected, actual) |
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99 ) |
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100 |
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101 |
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102 def importmod(modname): |
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103 """Import module according to policy and check API version""" |
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104 try: |
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105 verpkg, purepkg = _packageprefs[policy] |
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106 except KeyError: |
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107 raise ImportError('invalid HGMODULEPOLICY %r' % policy) |
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108 assert verpkg or purepkg |
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109 if verpkg: |
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110 pn, mn = _modredirects.get((verpkg, modname), (verpkg, modname)) |
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111 try: |
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112 mod = _importfrom(pn, mn) |
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113 if pn == verpkg: |
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114 _checkmod(pn, mn, mod) |
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115 return mod |
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116 except ImportError: |
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117 if not purepkg: |
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118 raise |
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119 pn, mn = _modredirects.get((purepkg, modname), (purepkg, modname)) |
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120 return _importfrom(pn, mn) |
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121 |
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122 |
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123 def _isrustpermissive(): |
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124 """Assuming the policy is a Rust one, tell if it's permissive.""" |
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125 return policy.endswith(b'-allow') |
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126 |
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127 |
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128 def importrust(modname, member=None, default=None): |
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129 """Import Rust module according to policy and availability. |
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130 |
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131 If policy isn't a Rust one, this returns `default`. |
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132 |
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133 If either the module or its member is not available, this returns `default` |
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134 if policy is permissive and raises `ImportError` if not. |
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135 """ |
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136 if not policy.startswith(b'rust'): |
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137 return default |
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138 |
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139 try: |
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140 mod = _importfrom('rustext', modname) |
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141 except ImportError: |
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142 if _isrustpermissive(): |
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143 return default |
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144 raise |
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145 if member is None: |
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146 return mod |
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147 |
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148 try: |
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149 return getattr(mod, member) |
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150 except AttributeError: |
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151 if _isrustpermissive(): |
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152 return default |
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153 raise ImportError("Cannot import name %s" % member) |