Mercurial > hg
annotate mercurial/policy.py @ 46779:49fd21f32695
revlog: guarantee that p1 != null if a non-null parent exists
This change does not affect the hashing (which already did this
transformation), but can change the log output in the rare case where
this behavior was observed in repositories. The change can simplify
iteration code where regular changesets and merges are distinct
branches.
Differential Revision: https://phab.mercurial-scm.org/D10150
author | Joerg Sonnenberger <joerg@bec.de> |
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date | Wed, 10 Mar 2021 18:09:21 +0100 |
parents | 61e7464477ac |
children | 12450fbea288 |
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'): 17, |
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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) |