Mercurial > hg
annotate mercurial/__init__.py @ 28062:1000ccf804a6
chg: use in-tree hg executable to start server for testing
author | Yuya Nishihara <yuya@tcha.org> |
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date | Sun, 03 Jan 2016 12:45:32 +0900 |
parents | 30a20167ae29 |
children | 17b85d739b62 |
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1 # __init__.py - Startup and module loading 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 imp |
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11 import os |
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12 import sys |
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13 import zipimport |
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14 |
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15 __all__ = [] |
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16 |
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17 # Rules for how modules can be loaded. Values are: |
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18 # |
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19 # c - require C extensions |
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20 # allow - allow pure Python implementation when C loading fails |
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21 # py - only load pure Python modules |
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22 modulepolicy = '@MODULELOADPOLICY@' |
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23 |
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24 # By default, require the C extensions for performance reasons. |
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25 if modulepolicy == '@' 'MODULELOADPOLICY' '@': |
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26 modulepolicy = 'c' |
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27 |
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28 # PyPy doesn't load C extensions. |
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29 # |
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30 # The canonical way to do this is to test platform.python_implementation(). |
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31 # But we don't import platform and don't bloat for it here. |
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32 if '__pypy__' in sys.builtin_module_names: |
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33 modulepolicy = 'py' |
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34 |
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35 # Environment variable can always force settings. |
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36 modulepolicy = os.environ.get('HGMODULEPOLICY', modulepolicy) |
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37 |
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38 # Modules that have both Python and C implementations. See also the |
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39 # set of .py files under mercurial/pure/. |
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40 _dualmodules = set([ |
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41 'mercurial.base85', |
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42 'mercurial.bdiff', |
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43 'mercurial.diffhelpers', |
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44 'mercurial.mpatch', |
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45 'mercurial.osutil', |
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46 'mercurial.parsers', |
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47 ]) |
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48 |
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49 class hgimporter(object): |
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50 """Object that conforms to import hook interface defined in PEP-302.""" |
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51 def find_module(self, name, path=None): |
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52 # We only care about modules that have both C and pure implementations. |
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53 if name in _dualmodules: |
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54 return self |
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55 return None |
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56 |
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57 def load_module(self, name): |
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58 mod = sys.modules.get(name, None) |
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59 if mod: |
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60 return mod |
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61 |
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62 mercurial = sys.modules['mercurial'] |
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63 |
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64 # The zip importer behaves sufficiently differently from the default |
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65 # importer to warrant its own code path. |
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66 loader = getattr(mercurial, '__loader__', None) |
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67 if isinstance(loader, zipimport.zipimporter): |
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68 def ziploader(*paths): |
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69 """Obtain a zipimporter for a directory under the main zip.""" |
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70 path = os.path.join(loader.archive, *paths) |
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71 zl = sys.path_importer_cache.get(path) |
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72 if not zl: |
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73 zl = zipimport.zipimporter(path) |
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74 return zl |
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75 |
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76 try: |
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77 if modulepolicy == 'py': |
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78 raise ImportError() |
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79 |
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80 zl = ziploader('mercurial') |
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81 mod = zl.load_module(name) |
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82 # Unlike imp, ziploader doesn't expose module metadata that |
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83 # indicates the type of module. So just assume what we found |
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84 # is OK (even though it could be a pure Python module). |
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85 except ImportError: |
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86 if modulepolicy == 'c': |
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87 raise |
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88 zl = ziploader('mercurial', 'pure') |
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89 mod = zl.load_module(name) |
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90 |
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91 sys.modules[name] = mod |
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92 return mod |
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93 |
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94 # Unlike the default importer which searches special locations and |
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95 # sys.path, we only look in the directory where "mercurial" was |
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96 # imported from. |
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97 |
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98 # imp.find_module doesn't support submodules (modules with "."). |
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99 # Instead you have to pass the parent package's __path__ attribute |
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100 # as the path argument. |
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101 stem = name.split('.')[-1] |
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102 |
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103 try: |
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104 if modulepolicy == 'py': |
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105 raise ImportError() |
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106 |
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107 modinfo = imp.find_module(stem, mercurial.__path__) |
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108 |
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109 # The Mercurial installer used to copy files from |
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110 # mercurial/pure/*.py to mercurial/*.py. Therefore, it's possible |
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111 # for some installations to have .py files under mercurial/*. |
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112 # Loading Python modules when we expected C versions could result |
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113 # in a) poor performance b) loading a version from a previous |
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114 # Mercurial version, potentially leading to incompatibility. Either |
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115 # scenario is bad. So we verify that modules loaded from |
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116 # mercurial/* are C extensions. If the current policy allows the |
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117 # loading of .py modules, the module will be re-imported from |
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118 # mercurial/pure/* below. |
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119 if modinfo[2][2] != imp.C_EXTENSION: |
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120 raise ImportError('.py version of %s found where C ' |
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121 'version should exist' % name) |
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122 |
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123 except ImportError: |
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124 if modulepolicy == 'c': |
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125 raise |
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126 |
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127 # Could not load the C extension and pure Python is allowed. So |
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128 # try to load them. |
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129 from . import pure |
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130 modinfo = imp.find_module(stem, pure.__path__) |
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131 if not modinfo: |
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132 raise ImportError('could not find mercurial module %s' % |
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133 name) |
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134 |
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135 mod = imp.load_module(name, *modinfo) |
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136 sys.modules[name] = mod |
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137 return mod |
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138 |
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139 # We automagically register our custom importer as a side-effect of loading. |
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140 # This is necessary to ensure that any entry points are able to import |
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141 # mercurial.* modules without having to perform this registration themselves. |
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142 if not any(isinstance(x, hgimporter) for x in sys.meta_path): |
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143 # meta_path is used before any implicit finders and before sys.path. |
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144 sys.meta_path.insert(0, hgimporter()) |