Mercurial > hg
annotate mercurial/__init__.py @ 30118:c19266edd93e
py3: a second argument to open can't be bytes
This fixes open(filename, 'r'), open(filename, 'w'), etc. calls. In Python
3, that second argument *must* be a string, you can't use bytes.
The fix is the same as used with getattr() (where the second argument must
also always be a string); in the tokenizer, where we detect calls, if there
is something that looks like a call to open (and is not an attribute, so
the previous token is not a "." dot) then make sure that that second
argument is not converted to a `bytes` object instead.
There is some remaining issue where the current transformer will also rewrite
open(f('foo')).
However this also affect function for which we perform similar rewrite
('getattr', 'setattr', 'hasattr', 'safehasattr') and will be dealt with in a
follow up.
author | Martijn Pieters <mjpieters@fb.com> |
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date | Sun, 09 Oct 2016 14:10:01 +0200 |
parents | eaaedad68011 |
children | 423377290a3a |
rev | line source |
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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 from . import ( |
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16 policy |
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17 ) |
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18 |
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19 __all__ = [] |
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20 |
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21 modulepolicy = policy.policy |
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22 |
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23 # Modules that have both Python and C implementations. See also the |
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24 # set of .py files under mercurial/pure/. |
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25 _dualmodules = set([ |
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26 'mercurial.base85', |
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27 'mercurial.bdiff', |
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28 'mercurial.diffhelpers', |
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29 'mercurial.mpatch', |
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30 'mercurial.osutil', |
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31 'mercurial.parsers', |
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32 ]) |
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33 |
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34 class hgimporter(object): |
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35 """Object that conforms to import hook interface defined in PEP-302.""" |
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36 def find_module(self, name, path=None): |
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37 # We only care about modules that have both C and pure implementations. |
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38 if name in _dualmodules: |
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39 return self |
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40 return None |
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41 |
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42 def load_module(self, name): |
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43 mod = sys.modules.get(name, None) |
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44 if mod: |
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45 return mod |
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46 |
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47 mercurial = sys.modules['mercurial'] |
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48 |
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49 # The zip importer behaves sufficiently differently from the default |
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50 # importer to warrant its own code path. |
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51 loader = getattr(mercurial, '__loader__', None) |
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52 if isinstance(loader, zipimport.zipimporter): |
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53 def ziploader(*paths): |
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54 """Obtain a zipimporter for a directory under the main zip.""" |
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55 path = os.path.join(loader.archive, *paths) |
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56 zl = sys.path_importer_cache.get(path) |
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57 if not zl: |
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58 zl = zipimport.zipimporter(path) |
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59 return zl |
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60 |
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61 try: |
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62 if modulepolicy in policy.policynoc: |
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63 raise ImportError() |
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64 |
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65 zl = ziploader('mercurial') |
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66 mod = zl.load_module(name) |
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67 # Unlike imp, ziploader doesn't expose module metadata that |
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68 # indicates the type of module. So just assume what we found |
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69 # is OK (even though it could be a pure Python module). |
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70 except ImportError: |
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71 if modulepolicy == 'c': |
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72 raise |
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73 zl = ziploader('mercurial', 'pure') |
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74 mod = zl.load_module(name) |
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75 |
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76 sys.modules[name] = mod |
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77 return mod |
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78 |
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79 # Unlike the default importer which searches special locations and |
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80 # sys.path, we only look in the directory where "mercurial" was |
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81 # imported from. |
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82 |
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83 # imp.find_module doesn't support submodules (modules with "."). |
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84 # Instead you have to pass the parent package's __path__ attribute |
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85 # as the path argument. |
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86 stem = name.split('.')[-1] |
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87 |
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88 try: |
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89 if modulepolicy in policy.policynoc: |
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90 raise ImportError() |
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91 |
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92 modinfo = imp.find_module(stem, mercurial.__path__) |
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93 |
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94 # The Mercurial installer used to copy files from |
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95 # mercurial/pure/*.py to mercurial/*.py. Therefore, it's possible |
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96 # for some installations to have .py files under mercurial/*. |
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97 # Loading Python modules when we expected C versions could result |
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98 # in a) poor performance b) loading a version from a previous |
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99 # Mercurial version, potentially leading to incompatibility. Either |
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100 # scenario is bad. So we verify that modules loaded from |
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101 # mercurial/* are C extensions. If the current policy allows the |
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102 # loading of .py modules, the module will be re-imported from |
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103 # mercurial/pure/* below. |
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104 if modinfo[2][2] != imp.C_EXTENSION: |
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105 raise ImportError('.py version of %s found where C ' |
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106 'version should exist' % name) |
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107 |
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108 except ImportError: |
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109 if modulepolicy == 'c': |
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110 raise |
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111 |
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112 # Could not load the C extension and pure Python is allowed. So |
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113 # try to load them. |
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114 from . import pure |
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115 modinfo = imp.find_module(stem, pure.__path__) |
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116 if not modinfo: |
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117 raise ImportError('could not find mercurial module %s' % |
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118 name) |
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119 |
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120 mod = imp.load_module(name, *modinfo) |
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121 sys.modules[name] = mod |
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122 return mod |
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123 |
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124 # Python 3 uses a custom module loader that transforms source code between |
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125 # source file reading and compilation. This is done by registering a custom |
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126 # finder that changes the spec for Mercurial modules to use a custom loader. |
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127 if sys.version_info[0] >= 3: |
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128 from . import pure |
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129 import importlib |
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130 import io |
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131 import token |
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132 import tokenize |
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133 |
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134 class hgpathentryfinder(importlib.abc.MetaPathFinder): |
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135 """A sys.meta_path finder that uses a custom module loader.""" |
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136 def find_spec(self, fullname, path, target=None): |
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137 # Only handle Mercurial-related modules. |
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138 if not fullname.startswith(('mercurial.', 'hgext.', 'hgext3rd.')): |
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139 return None |
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140 |
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141 # This assumes Python 3 doesn't support loading C modules. |
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142 if fullname in _dualmodules: |
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143 stem = fullname.split('.')[-1] |
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144 fullname = 'mercurial.pure.%s' % stem |
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145 target = pure |
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146 assert len(path) == 1 |
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147 path = [os.path.join(path[0], 'pure')] |
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148 |
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149 # Try to find the module using other registered finders. |
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150 spec = None |
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151 for finder in sys.meta_path: |
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152 if finder == self: |
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153 continue |
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154 |
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155 spec = finder.find_spec(fullname, path, target=target) |
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156 if spec: |
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157 break |
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158 |
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159 # This is a Mercurial-related module but we couldn't find it |
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160 # using the previously-registered finders. This likely means |
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161 # the module doesn't exist. |
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162 if not spec: |
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163 return None |
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164 |
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165 if fullname.startswith('mercurial.pure.'): |
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166 spec.name = spec.name.replace('.pure.', '.') |
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167 |
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168 # TODO need to support loaders from alternate specs, like zip |
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169 # loaders. |
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170 spec.loader = hgloader(spec.name, spec.origin) |
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171 return spec |
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172 |
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173 def replacetokens(tokens, fullname): |
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174 """Transform a stream of tokens from raw to Python 3. |
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175 |
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176 It is called by the custom module loading machinery to rewrite |
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177 source/tokens between source decoding and compilation. |
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178 |
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179 Returns a generator of possibly rewritten tokens. |
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180 |
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181 The input token list may be mutated as part of processing. However, |
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182 its changes do not necessarily match the output token stream. |
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183 |
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184 REMEMBER TO CHANGE ``BYTECODEHEADER`` WHEN CHANGING THIS FUNCTION |
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185 OR CACHED FILES WON'T GET INVALIDATED PROPERLY. |
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186 """ |
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187 futureimpline = False |
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188 for i, t in enumerate(tokens): |
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189 # Convert most string literals to byte literals. String literals |
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190 # in Python 2 are bytes. String literals in Python 3 are unicode. |
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191 # Most strings in Mercurial are bytes and unicode strings are rare. |
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192 # Rather than rewrite all string literals to use ``b''`` to indicate |
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193 # byte strings, we apply this token transformer to insert the ``b`` |
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194 # prefix nearly everywhere. |
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195 if t.type == token.STRING: |
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196 s = t.string |
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197 |
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198 # Preserve docstrings as string literals. This is inconsistent |
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199 # with regular unprefixed strings. However, the |
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200 # "from __future__" parsing (which allows a module docstring to |
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201 # exist before it) doesn't properly handle the docstring if it |
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202 # is b''' prefixed, leading to a SyntaxError. We leave all |
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203 # docstrings as unprefixed to avoid this. This means Mercurial |
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204 # components touching docstrings need to handle unicode, |
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205 # unfortunately. |
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206 if s[0:3] in ("'''", '"""'): |
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207 yield t |
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208 continue |
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209 |
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210 # If the first character isn't a quote, it is likely a string |
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211 # prefixing character (such as 'b', 'u', or 'r'. Ignore. |
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212 if s[0] not in ("'", '"'): |
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213 yield t |
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214 continue |
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215 |
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216 # String literal. Prefix to make a b'' string. |
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217 yield tokenize.TokenInfo(t.type, 'b%s' % s, t.start, t.end, |
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218 t.line) |
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219 continue |
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220 |
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221 # Insert compatibility imports at "from __future__ import" line. |
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222 # No '\n' should be added to preserve line numbers. |
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223 if (t.type == token.NAME and t.string == 'import' and |
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224 all(u.type == token.NAME for u in tokens[i - 2:i]) and |
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225 [u.string for u in tokens[i - 2:i]] == ['from', '__future__']): |
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226 futureimpline = True |
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227 if t.type == token.NEWLINE and futureimpline: |
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228 futureimpline = False |
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229 if fullname == 'mercurial.pycompat': |
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230 yield t |
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231 continue |
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232 r, c = t.start |
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233 l = (b'; from mercurial.pycompat import ' |
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234 b'delattr, getattr, hasattr, setattr, xrange\n') |
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235 for u in tokenize.tokenize(io.BytesIO(l).readline): |
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236 if u.type in (tokenize.ENCODING, token.ENDMARKER): |
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237 continue |
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238 yield tokenize.TokenInfo(u.type, u.string, |
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239 (r, c + u.start[1]), |
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240 (r, c + u.end[1]), |
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241 '') |
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242 continue |
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243 |
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244 try: |
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245 nexttoken = tokens[i + 1] |
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246 except IndexError: |
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247 nexttoken = None |
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248 |
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249 try: |
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250 prevtoken = tokens[i - 1] |
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251 except IndexError: |
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252 prevtoken = None |
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253 |
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254 # This looks like a function call. |
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255 if (t.type == token.NAME and nexttoken and |
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256 nexttoken.type == token.OP and nexttoken.string == '('): |
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257 fn = t.string |
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258 |
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259 # *attr() builtins don't accept byte strings to 2nd argument. |
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260 # Rewrite the token to include the unicode literal prefix so |
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261 # the string transformer above doesn't add the byte prefix. |
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262 if fn in ('getattr', 'setattr', 'hasattr', 'safehasattr'): |
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263 try: |
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264 # (NAME, 'getattr') |
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265 # (OP, '(') |
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266 # (NAME, 'foo') |
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267 # (OP, ',') |
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268 # (NAME|STRING, foo) |
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269 st = tokens[i + 4] |
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270 if (st.type == token.STRING and |
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271 st.string[0] in ("'", '"')): |
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272 rt = tokenize.TokenInfo(st.type, 'u%s' % st.string, |
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273 st.start, st.end, st.line) |
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274 tokens[i + 4] = rt |
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275 except IndexError: |
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276 pass |
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277 |
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278 # .encode() and .decode() on str/bytes/unicode don't accept |
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279 # byte strings on Python 3. Rewrite the token to include the |
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280 # unicode literal prefix so the string transformer above doesn't |
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281 # add the byte prefix. The loop helps in handling multiple |
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282 # arguments. |
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283 if (fn in ('encode', 'decode') and |
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284 prevtoken.type == token.OP and prevtoken.string == '.'): |
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285 # (OP, '.') |
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286 # (NAME, 'encode') |
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287 # (OP, '(') |
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288 # [(VARIABLE, encoding)] |
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289 # [(OP, '.')] |
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290 # [(VARIABLE, encoding)] |
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291 # [(OP, ',')] |
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292 # (STRING, 'utf-8') |
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293 # (OP, ')') |
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294 j = i |
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295 try: |
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296 while (tokens[j + 1].string in ('(', ',', '.')): |
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297 st = tokens[j + 2] |
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298 if (st.type == token.STRING and |
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299 st.string[0] in ("'", '"')): |
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300 rt = tokenize.TokenInfo(st.type, |
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301 'u%s' % st.string, |
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302 st.start, st.end, st.line) |
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303 tokens[j + 2] = rt |
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304 j = j + 2 |
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305 except IndexError: |
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306 pass |
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307 |
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308 # Bare open call (not an attribute on something else) |
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309 if (fn == 'open' and not (prevtoken.type == token.OP and |
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310 prevtoken.string == '.')): |
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311 try: |
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312 # (NAME, 'open') |
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313 # (OP, '(') |
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314 # (NAME|STRING, 'filename') |
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315 # (OP, ',') |
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316 # (NAME|STRING, mode) |
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317 st = tokens[i + 4] |
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318 if (st.type == token.STRING and |
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319 st.string[0] in ("'", '"')): |
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320 rt = tokenize.TokenInfo(st.type, 'u%s' % st.string, |
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321 st.start, st.end, st.line) |
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322 tokens[i + 4] = rt |
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323 except IndexError: |
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324 pass |
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325 |
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326 # It changes iteritems to items as iteritems is not |
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327 # present in Python 3 world. |
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328 if fn == 'iteritems': |
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329 yield tokenize.TokenInfo(t.type, 'items', |
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330 t.start, t.end, t.line) |
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331 continue |
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332 |
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333 # Emit unmodified token. |
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334 yield t |
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335 |
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336 # Header to add to bytecode files. This MUST be changed when |
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337 # ``replacetoken`` or any mechanism that changes semantics of module |
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338 # loading is changed. Otherwise cached bytecode may get loaded without |
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339 # the new transformation mechanisms applied. |
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340 BYTECODEHEADER = b'HG\x00\x05' |
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341 |
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342 class hgloader(importlib.machinery.SourceFileLoader): |
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343 """Custom module loader that transforms source code. |
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344 |
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345 When the source code is converted to a code object, we transform |
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346 certain patterns to be Python 3 compatible. This allows us to write code |
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347 that is natively Python 2 and compatible with Python 3 without |
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348 making the code excessively ugly. |
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349 |
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350 We do this by transforming the token stream between parse and compile. |
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351 |
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352 Implementing transformations invalidates caching assumptions made |
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353 by the built-in importer. The built-in importer stores a header on |
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354 saved bytecode files indicating the Python/bytecode version. If the |
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355 version changes, the cached bytecode is ignored. The Mercurial |
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356 transformations could change at any time. This means we need to check |
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357 that cached bytecode was generated with the current transformation |
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358 code or there could be a mismatch between cached bytecode and what |
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359 would be generated from this class. |
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360 |
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361 We supplement the bytecode caching layer by wrapping ``get_data`` |
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362 and ``set_data``. These functions are called when the |
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363 ``SourceFileLoader`` retrieves and saves bytecode cache files, |
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364 respectively. We simply add an additional header on the file. As |
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365 long as the version in this file is changed when semantics change, |
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366 cached bytecode should be invalidated when transformations change. |
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367 |
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368 The added header has the form ``HG<VERSION>``. That is a literal |
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369 ``HG`` with 2 binary bytes indicating the transformation version. |
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370 """ |
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371 def get_data(self, path): |
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372 data = super(hgloader, self).get_data(path) |
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373 |
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374 if not path.endswith(tuple(importlib.machinery.BYTECODE_SUFFIXES)): |
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375 return data |
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376 |
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377 # There should be a header indicating the Mercurial transformation |
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378 # version. If it doesn't exist or doesn't match the current version, |
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379 # we raise an OSError because that is what |
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380 # ``SourceFileLoader.get_code()`` expects when loading bytecode |
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381 # paths to indicate the cached file is "bad." |
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382 if data[0:2] != b'HG': |
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383 raise OSError('no hg header') |
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384 if data[0:4] != BYTECODEHEADER: |
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385 raise OSError('hg header version mismatch') |
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386 |
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387 return data[4:] |
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388 |
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389 def set_data(self, path, data, *args, **kwargs): |
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390 if path.endswith(tuple(importlib.machinery.BYTECODE_SUFFIXES)): |
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391 data = BYTECODEHEADER + data |
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392 |
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393 return super(hgloader, self).set_data(path, data, *args, **kwargs) |
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394 |
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395 def source_to_code(self, data, path): |
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396 """Perform token transformation before compilation.""" |
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397 buf = io.BytesIO(data) |
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398 tokens = tokenize.tokenize(buf.readline) |
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399 data = tokenize.untokenize(replacetokens(list(tokens), self.name)) |
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400 # Python's built-in importer strips frames from exceptions raised |
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401 # for this code. Unfortunately, that mechanism isn't extensible |
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402 # and our frame will be blamed for the import failure. There |
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403 # are extremely hacky ways to do frame stripping. We haven't |
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404 # implemented them because they are very ugly. |
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405 return super(hgloader, self).source_to_code(data, path) |
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406 |
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407 # We automagically register our custom importer as a side-effect of loading. |
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408 # This is necessary to ensure that any entry points are able to import |
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409 # mercurial.* modules without having to perform this registration themselves. |
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410 if sys.version_info[0] >= 3: |
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411 _importercls = hgpathentryfinder |
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412 else: |
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413 _importercls = hgimporter |
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414 if not any(isinstance(x, _importercls) for x in sys.meta_path): |
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415 # meta_path is used before any implicit finders and before sys.path. |
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416 sys.meta_path.insert(0, _importercls()) |