Mercurial > repos > guerler > hhblits
annotate lib/python3.8/site-packages/pip/_internal/utils/compat.py @ 0:9e54283cc701 draft
"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author | guerler |
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date | Mon, 27 Jul 2020 03:47:31 -0400 |
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1 """Stuff that differs in different Python versions and platform |
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2 distributions.""" |
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3 |
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4 # The following comment should be removed at some point in the future. |
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5 # mypy: disallow-untyped-defs=False |
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6 |
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7 from __future__ import absolute_import, division |
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8 |
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9 import codecs |
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10 import locale |
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11 import logging |
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12 import os |
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13 import shutil |
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14 import sys |
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15 |
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16 from pip._vendor.six import PY2, text_type |
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17 |
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18 from pip._internal.utils.typing import MYPY_CHECK_RUNNING |
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19 |
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20 if MYPY_CHECK_RUNNING: |
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21 from typing import Optional, Text, Tuple, Union |
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22 |
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23 try: |
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24 import ipaddress |
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25 except ImportError: |
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26 try: |
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27 from pip._vendor import ipaddress # type: ignore |
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28 except ImportError: |
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29 import ipaddr as ipaddress # type: ignore |
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30 ipaddress.ip_address = ipaddress.IPAddress # type: ignore |
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31 ipaddress.ip_network = ipaddress.IPNetwork # type: ignore |
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32 |
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33 |
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34 __all__ = [ |
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35 "ipaddress", "uses_pycache", "console_to_str", |
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36 "get_path_uid", "stdlib_pkgs", "WINDOWS", "samefile", "get_terminal_size", |
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37 ] |
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38 |
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39 |
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40 logger = logging.getLogger(__name__) |
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41 |
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42 if PY2: |
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43 import imp |
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44 |
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45 try: |
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46 cache_from_source = imp.cache_from_source # type: ignore |
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47 except AttributeError: |
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48 # does not use __pycache__ |
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49 cache_from_source = None |
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50 |
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51 uses_pycache = cache_from_source is not None |
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52 else: |
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53 uses_pycache = True |
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54 from importlib.util import cache_from_source |
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55 |
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56 |
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57 if PY2: |
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58 # In Python 2.7, backslashreplace exists |
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59 # but does not support use for decoding. |
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60 # We implement our own replace handler for this |
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61 # situation, so that we can consistently use |
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62 # backslash replacement for all versions. |
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63 def backslashreplace_decode_fn(err): |
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64 raw_bytes = (err.object[i] for i in range(err.start, err.end)) |
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65 # Python 2 gave us characters - convert to numeric bytes |
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66 raw_bytes = (ord(b) for b in raw_bytes) |
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67 return u"".join(u"\\x%x" % c for c in raw_bytes), err.end |
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68 codecs.register_error( |
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69 "backslashreplace_decode", |
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70 backslashreplace_decode_fn, |
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71 ) |
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72 backslashreplace_decode = "backslashreplace_decode" |
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73 else: |
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74 backslashreplace_decode = "backslashreplace" |
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75 |
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76 |
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77 def has_tls(): |
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78 # type: () -> bool |
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79 try: |
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80 import _ssl # noqa: F401 # ignore unused |
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81 return True |
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82 except ImportError: |
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83 pass |
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84 |
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85 from pip._vendor.urllib3.util import IS_PYOPENSSL |
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86 return IS_PYOPENSSL |
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87 |
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88 |
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89 def str_to_display(data, desc=None): |
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90 # type: (Union[bytes, Text], Optional[str]) -> Text |
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91 """ |
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92 For display or logging purposes, convert a bytes object (or text) to |
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93 text (e.g. unicode in Python 2) safe for output. |
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94 |
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95 :param desc: An optional phrase describing the input data, for use in |
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96 the log message if a warning is logged. Defaults to "Bytes object". |
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97 |
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98 This function should never error out and so can take a best effort |
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99 approach. It is okay to be lossy if needed since the return value is |
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100 just for display. |
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101 |
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102 We assume the data is in the locale preferred encoding. If it won't |
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103 decode properly, we warn the user but decode as best we can. |
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104 |
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105 We also ensure that the output can be safely written to standard output |
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106 without encoding errors. |
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107 """ |
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108 if isinstance(data, text_type): |
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109 return data |
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110 |
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111 # Otherwise, data is a bytes object (str in Python 2). |
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112 # First, get the encoding we assume. This is the preferred |
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113 # encoding for the locale, unless that is not found, or |
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114 # it is ASCII, in which case assume UTF-8 |
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115 encoding = locale.getpreferredencoding() |
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116 if (not encoding) or codecs.lookup(encoding).name == "ascii": |
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117 encoding = "utf-8" |
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118 |
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119 # Now try to decode the data - if we fail, warn the user and |
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120 # decode with replacement. |
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121 try: |
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122 decoded_data = data.decode(encoding) |
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123 except UnicodeDecodeError: |
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124 if desc is None: |
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125 desc = 'Bytes object' |
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126 msg_format = '{} does not appear to be encoded as %s'.format(desc) |
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127 logger.warning(msg_format, encoding) |
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128 decoded_data = data.decode(encoding, errors=backslashreplace_decode) |
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129 |
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130 # Make sure we can print the output, by encoding it to the output |
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131 # encoding with replacement of unencodable characters, and then |
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132 # decoding again. |
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133 # We use stderr's encoding because it's less likely to be |
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134 # redirected and if we don't find an encoding we skip this |
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135 # step (on the assumption that output is wrapped by something |
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136 # that won't fail). |
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137 # The double getattr is to deal with the possibility that we're |
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138 # being called in a situation where sys.__stderr__ doesn't exist, |
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139 # or doesn't have an encoding attribute. Neither of these cases |
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140 # should occur in normal pip use, but there's no harm in checking |
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141 # in case people use pip in (unsupported) unusual situations. |
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142 output_encoding = getattr(getattr(sys, "__stderr__", None), |
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143 "encoding", None) |
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144 |
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145 if output_encoding: |
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146 output_encoded = decoded_data.encode( |
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147 output_encoding, |
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148 errors="backslashreplace" |
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149 ) |
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150 decoded_data = output_encoded.decode(output_encoding) |
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151 |
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152 return decoded_data |
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153 |
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154 |
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155 def console_to_str(data): |
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156 # type: (bytes) -> Text |
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157 """Return a string, safe for output, of subprocess output. |
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158 """ |
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159 return str_to_display(data, desc='Subprocess output') |
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160 |
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161 |
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162 def get_path_uid(path): |
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163 # type: (str) -> int |
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164 """ |
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165 Return path's uid. |
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166 |
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167 Does not follow symlinks: |
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168 https://github.com/pypa/pip/pull/935#discussion_r5307003 |
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169 |
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170 Placed this function in compat due to differences on AIX and |
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171 Jython, that should eventually go away. |
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172 |
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173 :raises OSError: When path is a symlink or can't be read. |
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174 """ |
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175 if hasattr(os, 'O_NOFOLLOW'): |
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176 fd = os.open(path, os.O_RDONLY | os.O_NOFOLLOW) |
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177 file_uid = os.fstat(fd).st_uid |
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178 os.close(fd) |
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179 else: # AIX and Jython |
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180 # WARNING: time of check vulnerability, but best we can do w/o NOFOLLOW |
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181 if not os.path.islink(path): |
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182 # older versions of Jython don't have `os.fstat` |
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183 file_uid = os.stat(path).st_uid |
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184 else: |
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185 # raise OSError for parity with os.O_NOFOLLOW above |
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186 raise OSError( |
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187 "%s is a symlink; Will not return uid for symlinks" % path |
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188 ) |
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189 return file_uid |
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190 |
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191 |
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192 def expanduser(path): |
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193 # type: (str) -> str |
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194 """ |
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195 Expand ~ and ~user constructions. |
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196 |
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197 Includes a workaround for https://bugs.python.org/issue14768 |
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198 """ |
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199 expanded = os.path.expanduser(path) |
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200 if path.startswith('~/') and expanded.startswith('//'): |
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201 expanded = expanded[1:] |
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202 return expanded |
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203 |
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204 |
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205 # packages in the stdlib that may have installation metadata, but should not be |
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206 # considered 'installed'. this theoretically could be determined based on |
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207 # dist.location (py27:`sysconfig.get_paths()['stdlib']`, |
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208 # py26:sysconfig.get_config_vars('LIBDEST')), but fear platform variation may |
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209 # make this ineffective, so hard-coding |
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210 stdlib_pkgs = {"python", "wsgiref", "argparse"} |
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211 |
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212 |
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213 # windows detection, covers cpython and ironpython |
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214 WINDOWS = (sys.platform.startswith("win") or |
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215 (sys.platform == 'cli' and os.name == 'nt')) |
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216 |
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217 |
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218 def samefile(file1, file2): |
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219 # type: (str, str) -> bool |
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220 """Provide an alternative for os.path.samefile on Windows/Python2""" |
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221 if hasattr(os.path, 'samefile'): |
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222 return os.path.samefile(file1, file2) |
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223 else: |
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224 path1 = os.path.normcase(os.path.abspath(file1)) |
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225 path2 = os.path.normcase(os.path.abspath(file2)) |
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226 return path1 == path2 |
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227 |
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228 |
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229 if hasattr(shutil, 'get_terminal_size'): |
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230 def get_terminal_size(): |
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231 # type: () -> Tuple[int, int] |
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232 """ |
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233 Returns a tuple (x, y) representing the width(x) and the height(y) |
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234 in characters of the terminal window. |
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235 """ |
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236 return tuple(shutil.get_terminal_size()) # type: ignore |
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237 else: |
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238 def get_terminal_size(): |
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239 # type: () -> Tuple[int, int] |
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240 """ |
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241 Returns a tuple (x, y) representing the width(x) and the height(y) |
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242 in characters of the terminal window. |
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243 """ |
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244 def ioctl_GWINSZ(fd): |
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245 try: |
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246 import fcntl |
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247 import termios |
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248 import struct |
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249 cr = struct.unpack_from( |
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250 'hh', |
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251 fcntl.ioctl(fd, termios.TIOCGWINSZ, '12345678') |
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252 ) |
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253 except Exception: |
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254 return None |
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255 if cr == (0, 0): |
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256 return None |
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257 return cr |
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258 cr = ioctl_GWINSZ(0) or ioctl_GWINSZ(1) or ioctl_GWINSZ(2) |
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259 if not cr: |
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260 if sys.platform != "win32": |
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261 try: |
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262 fd = os.open(os.ctermid(), os.O_RDONLY) |
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263 cr = ioctl_GWINSZ(fd) |
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264 os.close(fd) |
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265 except Exception: |
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266 pass |
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267 if not cr: |
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268 cr = (os.environ.get('LINES', 25), os.environ.get('COLUMNS', 80)) |
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269 return int(cr[1]), int(cr[0]) |