Mercurial > hg
annotate mercurial/policy.py @ 36705:c6901665cd5b
py3: make sure __repr__ returns a str
# skip-blame because just r'' prefix
Differential Revision: https://phab.mercurial-scm.org/D2652
author | Pulkit Goyal <7895pulkit@gmail.com> |
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date | Sun, 04 Mar 2018 22:40:33 +0530 |
parents | 430fdb717549 |
children | f3c314020beb |
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 # allow - allow pure Python implementation when C loading fails |
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17 # cffi - required cffi versions (implemented within pure module) |
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18 # cffi-allow - allow pure Python implementation if cffi version is missing |
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19 # py - only load pure Python modules |
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20 # |
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21 # By default, fall back to the pure modules so the in-place build can |
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22 # run without recompiling the C extensions. This will be overridden by |
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23 # __modulepolicy__ generated by setup.py. |
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24 policy = b'allow' |
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25 _packageprefs = { |
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26 # policy: (versioned package, pure package) |
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27 b'c': (r'cext', None), |
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28 b'allow': (r'cext', r'pure'), |
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29 b'cffi': (r'cffi', None), |
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30 b'cffi-allow': (r'cffi', r'pure'), |
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31 b'py': (None, r'pure'), |
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32 } |
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33 |
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34 try: |
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35 from . import __modulepolicy__ |
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36 policy = __modulepolicy__.modulepolicy |
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37 except ImportError: |
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38 pass |
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39 |
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40 # PyPy doesn't load C extensions. |
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41 # |
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42 # The canonical way to do this is to test platform.python_implementation(). |
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43 # But we don't import platform and don't bloat for it here. |
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44 if r'__pypy__' in sys.builtin_module_names: |
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45 policy = b'cffi' |
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46 |
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47 # Environment variable can always force settings. |
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48 if sys.version_info[0] >= 3: |
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49 if r'HGMODULEPOLICY' in os.environ: |
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50 policy = os.environ[r'HGMODULEPOLICY'].encode(r'utf-8') |
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51 else: |
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52 policy = os.environ.get(r'HGMODULEPOLICY', policy) |
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53 |
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54 def _importfrom(pkgname, modname): |
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55 # from .<pkgname> import <modname> (where . is looked through this module) |
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56 fakelocals = {} |
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57 pkg = __import__(pkgname, globals(), fakelocals, [modname], level=1) |
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58 try: |
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59 fakelocals[modname] = mod = getattr(pkg, modname) |
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60 except AttributeError: |
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61 raise ImportError(r'cannot import name %s' % modname) |
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62 # force import; fakelocals[modname] may be replaced with the real module |
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63 getattr(mod, r'__doc__', None) |
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64 return fakelocals[modname] |
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65 |
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66 # keep in sync with "version" in C modules |
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67 _cextversions = { |
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68 (r'cext', r'base85'): 1, |
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70 (r'cext', r'diffhelpers'): 1, |
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71 (r'cext', r'mpatch'): 1, |
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72 (r'cext', r'osutil'): 3, |
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73 (r'cext', r'parsers'): 4, |
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74 } |
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75 |
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76 # map import request to other package or module |
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77 _modredirects = { |
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78 (r'cext', r'charencode'): (r'cext', r'parsers'), |
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79 (r'cffi', r'base85'): (r'pure', r'base85'), |
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80 (r'cffi', r'charencode'): (r'pure', r'charencode'), |
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81 (r'cffi', r'diffhelpers'): (r'pure', r'diffhelpers'), |
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82 (r'cffi', r'parsers'): (r'pure', r'parsers'), |
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83 } |
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84 |
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85 def _checkmod(pkgname, modname, mod): |
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86 expected = _cextversions.get((pkgname, modname)) |
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87 actual = getattr(mod, r'version', None) |
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88 if actual != expected: |
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89 raise ImportError(r'cannot import module %s.%s ' |
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90 r'(expected version: %d, actual: %r)' |
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91 % (pkgname, modname, expected, actual)) |
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92 |
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93 def importmod(modname): |
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94 """Import module according to policy and check API version""" |
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95 try: |
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96 verpkg, purepkg = _packageprefs[policy] |
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97 except KeyError: |
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98 raise ImportError(r'invalid HGMODULEPOLICY %r' % policy) |
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99 assert verpkg or purepkg |
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100 if verpkg: |
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101 pn, mn = _modredirects.get((verpkg, modname), (verpkg, modname)) |
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102 try: |
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103 mod = _importfrom(pn, mn) |
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104 if pn == verpkg: |
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105 _checkmod(pn, mn, mod) |
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106 return mod |
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107 except ImportError: |
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108 if not purepkg: |
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109 raise |
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110 pn, mn = _modredirects.get((purepkg, modname), (purepkg, modname)) |
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111 return _importfrom(pn, mn) |