Mercurial > hg
annotate mercurial/policy.py @ 42522:d29db0a0c4eb
update: fix spurious unclean status bug shown by previous commit
The crux of the problem is:
- the dirstate is corrupted (the sizes/dates are assigned to the wrong files)
- because when worker.worker is used with a return value (batchget in
merge.py here), the return value when worker.worker effectively parallelizes
is permuted
- this is because worker.worker's partition of input and combination of output
values are not inverses of one another: it split [1,2,3,4,5,6] into
[[1,3,5],[2,4,6]], but combines that into [1,3,5,2,4,6].
Given that worker.worker doesn't call its function argument on contiguous
chunks on the input arguments, sticking with lists means we'd need to
know the relation between the inputs of worker.worker function argument
(for instance, requiring that every input element is mapped to exactly
one output element). It seems better to instead switch return values to
dicts, which can combined reliably with a straighforward restriction.
Differential Revision: https://phab.mercurial-scm.org/D6581
author | Valentin Gatien-Baron <valentin.gatienbaron@gmail.com> |
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date | Thu, 27 Jun 2019 11:39:35 +0200 |
parents | 810f66b468cd |
children | 57875cf423c9 |
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 # Rules for how modules can be loaded. Values are: |
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14 # |
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15 # c - require C extensions |
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16 # rust+c - require Rust and C extensions |
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17 # rust+c-allow - allow Rust and C extensions with fallback to pure Python |
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18 # for each |
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19 # allow - allow pure Python implementation when C loading fails |
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20 # cffi - required cffi versions (implemented within pure module) |
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21 # cffi-allow - allow pure Python implementation if cffi version is missing |
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22 # py - only load pure Python modules |
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23 # |
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24 # By default, fall back to the pure modules so the in-place build can |
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25 # run without recompiling the C extensions. This will be overridden by |
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26 # __modulepolicy__ generated by setup.py. |
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27 policy = b'allow' |
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28 _packageprefs = { |
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29 # policy: (versioned package, pure package) |
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30 b'c': (r'cext', None), |
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31 b'allow': (r'cext', r'pure'), |
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32 b'cffi': (r'cffi', None), |
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33 b'cffi-allow': (r'cffi', r'pure'), |
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34 b'py': (None, r'pure'), |
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35 # For now, rust policies impact importrust only |
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36 b'rust+c': (r'cext', None), |
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37 b'rust+c-allow': (r'cext', r'pure'), |
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38 } |
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39 |
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40 try: |
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41 from . import __modulepolicy__ |
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42 policy = __modulepolicy__.modulepolicy |
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43 except ImportError: |
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44 pass |
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45 |
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46 # PyPy doesn't load C extensions. |
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47 # |
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48 # The canonical way to do this is to test platform.python_implementation(). |
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49 # But we don't import platform and don't bloat for it here. |
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50 if r'__pypy__' in sys.builtin_module_names: |
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51 policy = b'cffi' |
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52 |
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53 # Environment variable can always force settings. |
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54 if sys.version_info[0] >= 3: |
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55 if r'HGMODULEPOLICY' in os.environ: |
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56 policy = os.environ[r'HGMODULEPOLICY'].encode(r'utf-8') |
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57 else: |
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58 policy = os.environ.get(r'HGMODULEPOLICY', policy) |
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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(r'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, r'__doc__', None) |
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70 return fakelocals[modname] |
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71 |
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72 # keep in sync with "version" in C modules |
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73 _cextversions = { |
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74 (r'cext', r'base85'): 1, |
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76 (r'cext', r'mpatch'): 1, |
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77 (r'cext', r'osutil'): 4, |
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78 (r'cext', r'parsers'): 13, |
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79 } |
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80 |
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81 # map import request to other package or module |
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82 _modredirects = { |
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83 (r'cext', r'charencode'): (r'cext', r'parsers'), |
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84 (r'cffi', r'base85'): (r'pure', r'base85'), |
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85 (r'cffi', r'charencode'): (r'pure', r'charencode'), |
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86 (r'cffi', r'parsers'): (r'pure', r'parsers'), |
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87 } |
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88 |
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89 def _checkmod(pkgname, modname, mod): |
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90 expected = _cextversions.get((pkgname, modname)) |
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91 actual = getattr(mod, r'version', None) |
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92 if actual != expected: |
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93 raise ImportError(r'cannot import module %s.%s ' |
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94 r'(expected version: %d, actual: %r)' |
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95 % (pkgname, modname, expected, actual)) |
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96 |
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97 def importmod(modname): |
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98 """Import module according to policy and check API version""" |
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99 try: |
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100 verpkg, purepkg = _packageprefs[policy] |
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101 except KeyError: |
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102 raise ImportError(r'invalid HGMODULEPOLICY %r' % policy) |
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103 assert verpkg or purepkg |
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104 if verpkg: |
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105 pn, mn = _modredirects.get((verpkg, modname), (verpkg, modname)) |
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106 try: |
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107 mod = _importfrom(pn, mn) |
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108 if pn == verpkg: |
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109 _checkmod(pn, mn, mod) |
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110 return mod |
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111 except ImportError: |
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112 if not purepkg: |
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113 raise |
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114 pn, mn = _modredirects.get((purepkg, modname), (purepkg, modname)) |
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115 return _importfrom(pn, mn) |
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116 |
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117 def _isrustpermissive(): |
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118 """Assuming the policy is a Rust one, tell if it's permissive.""" |
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119 return policy.endswith(b'-allow') |
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120 |
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121 def importrust(modname, member=None, default=None): |
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122 """Import Rust module according to policy and availability. |
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123 |
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124 If policy isn't a Rust one, this returns `default`. |
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125 |
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126 If either the module or its member is not available, this returns `default` |
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127 if policy is permissive and raises `ImportError` if not. |
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128 """ |
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129 if not policy.startswith(b'rust'): |
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130 return default |
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131 |
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132 try: |
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133 mod = _importfrom(r'rustext', modname) |
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134 except ImportError: |
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135 if _isrustpermissive(): |
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136 return default |
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137 raise |
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138 if member is None: |
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139 return mod |
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140 |
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141 try: |
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142 return getattr(mod, member) |
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143 except AttributeError: |
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144 if _isrustpermissive(): |
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145 return default |
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146 raise ImportError(r"Cannot import name %s" % member) |