Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/pip/_internal/utils/compat.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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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 from __future__ import absolute_import, division
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4
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5 import codecs
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6 import locale
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7 import logging
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8 import os
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9 import shutil
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10 import sys
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11
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12 from pip._vendor.six import text_type
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13 from pip._vendor.urllib3.util import IS_PYOPENSSL
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14
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15 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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16
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17 if MYPY_CHECK_RUNNING:
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18 from typing import Optional, Text, Tuple, Union
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19
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20 try:
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21 import _ssl # noqa
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22 except ImportError:
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23 ssl = None
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24 else:
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25 # This additional assignment was needed to prevent a mypy error.
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26 ssl = _ssl
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27
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28 try:
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29 import ipaddress
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30 except ImportError:
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31 try:
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32 from pip._vendor import ipaddress # type: ignore
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33 except ImportError:
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34 import ipaddr as ipaddress # type: ignore
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35 ipaddress.ip_address = ipaddress.IPAddress # type: ignore
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36 ipaddress.ip_network = ipaddress.IPNetwork # type: ignore
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37
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38
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39 __all__ = [
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40 "ipaddress", "uses_pycache", "console_to_str", "native_str",
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41 "get_path_uid", "stdlib_pkgs", "WINDOWS", "samefile", "get_terminal_size",
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42 "get_extension_suffixes",
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43 ]
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44
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45
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46 logger = logging.getLogger(__name__)
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47
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48 HAS_TLS = (ssl is not None) or IS_PYOPENSSL
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49
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50 if sys.version_info >= (3, 4):
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51 uses_pycache = True
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52 from importlib.util import cache_from_source
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53 else:
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54 import imp
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55
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56 try:
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57 cache_from_source = imp.cache_from_source # type: ignore
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58 except AttributeError:
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59 # does not use __pycache__
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60 cache_from_source = None
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61
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62 uses_pycache = cache_from_source is not None
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63
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64
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65 if sys.version_info >= (3, 5):
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66 backslashreplace_decode = "backslashreplace"
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67 else:
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68 # In version 3.4 and older, backslashreplace exists
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69 # but does not support use for decoding.
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70 # We implement our own replace handler for this
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71 # situation, so that we can consistently use
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72 # backslash replacement for all versions.
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73 def backslashreplace_decode_fn(err):
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74 raw_bytes = (err.object[i] for i in range(err.start, err.end))
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75 if sys.version_info[0] == 2:
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76 # Python 2 gave us characters - convert to numeric bytes
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77 raw_bytes = (ord(b) for b in raw_bytes)
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78 return u"".join(u"\\x%x" % c for c in raw_bytes), err.end
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79 codecs.register_error(
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80 "backslashreplace_decode",
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81 backslashreplace_decode_fn,
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82 )
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83 backslashreplace_decode = "backslashreplace_decode"
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84
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85
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86 def str_to_display(data, desc=None):
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87 # type: (Union[bytes, Text], Optional[str]) -> Text
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88 """
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89 For display or logging purposes, convert a bytes object (or text) to
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90 text (e.g. unicode in Python 2) safe for output.
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91
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92 :param desc: An optional phrase describing the input data, for use in
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93 the log message if a warning is logged. Defaults to "Bytes object".
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94
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95 This function should never error out and so can take a best effort
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96 approach. It is okay to be lossy if needed since the return value is
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97 just for display.
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98
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99 We assume the data is in the locale preferred encoding. If it won't
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100 decode properly, we warn the user but decode as best we can.
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101
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102 We also ensure that the output can be safely written to standard output
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103 without encoding errors.
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104 """
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105 if isinstance(data, text_type):
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106 return data
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107
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108 # Otherwise, data is a bytes object (str in Python 2).
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109 # First, get the encoding we assume. This is the preferred
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110 # encoding for the locale, unless that is not found, or
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111 # it is ASCII, in which case assume UTF-8
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112 encoding = locale.getpreferredencoding()
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113 if (not encoding) or codecs.lookup(encoding).name == "ascii":
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114 encoding = "utf-8"
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115
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116 # Now try to decode the data - if we fail, warn the user and
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117 # decode with replacement.
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118 try:
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119 decoded_data = data.decode(encoding)
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120 except UnicodeDecodeError:
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121 if desc is None:
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122 desc = 'Bytes object'
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123 msg_format = '{} does not appear to be encoded as %s'.format(desc)
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124 logger.warning(msg_format, encoding)
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125 decoded_data = data.decode(encoding, errors=backslashreplace_decode)
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126
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127 # Make sure we can print the output, by encoding it to the output
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128 # encoding with replacement of unencodable characters, and then
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129 # decoding again.
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130 # We use stderr's encoding because it's less likely to be
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131 # redirected and if we don't find an encoding we skip this
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132 # step (on the assumption that output is wrapped by something
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133 # that won't fail).
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134 # The double getattr is to deal with the possibility that we're
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135 # being called in a situation where sys.__stderr__ doesn't exist,
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136 # or doesn't have an encoding attribute. Neither of these cases
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137 # should occur in normal pip use, but there's no harm in checking
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138 # in case people use pip in (unsupported) unusual situations.
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139 output_encoding = getattr(getattr(sys, "__stderr__", None),
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140 "encoding", None)
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141
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142 if output_encoding:
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143 output_encoded = decoded_data.encode(
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144 output_encoding,
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145 errors="backslashreplace"
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146 )
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147 decoded_data = output_encoded.decode(output_encoding)
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148
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149 return decoded_data
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150
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151
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152 def console_to_str(data):
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153 # type: (bytes) -> Text
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154 """Return a string, safe for output, of subprocess output.
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155 """
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156 return str_to_display(data, desc='Subprocess output')
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157
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158
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159 if sys.version_info >= (3,):
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160 def native_str(s, replace=False):
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161 # type: (str, bool) -> str
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162 if isinstance(s, bytes):
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163 return s.decode('utf-8', 'replace' if replace else 'strict')
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164 return s
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165
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166 else:
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167 def native_str(s, replace=False):
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168 # type: (str, bool) -> str
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169 # Replace is ignored -- unicode to UTF-8 can't fail
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170 if isinstance(s, text_type):
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171 return s.encode('utf-8')
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172 return s
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173
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174
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175 def get_path_uid(path):
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176 # type: (str) -> int
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177 """
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178 Return path's uid.
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179
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180 Does not follow symlinks:
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181 https://github.com/pypa/pip/pull/935#discussion_r5307003
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182
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183 Placed this function in compat due to differences on AIX and
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184 Jython, that should eventually go away.
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185
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186 :raises OSError: When path is a symlink or can't be read.
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187 """
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188 if hasattr(os, 'O_NOFOLLOW'):
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189 fd = os.open(path, os.O_RDONLY | os.O_NOFOLLOW)
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190 file_uid = os.fstat(fd).st_uid
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191 os.close(fd)
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192 else: # AIX and Jython
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193 # WARNING: time of check vulnerability, but best we can do w/o NOFOLLOW
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194 if not os.path.islink(path):
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195 # older versions of Jython don't have `os.fstat`
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196 file_uid = os.stat(path).st_uid
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197 else:
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198 # raise OSError for parity with os.O_NOFOLLOW above
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199 raise OSError(
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200 "%s is a symlink; Will not return uid for symlinks" % path
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201 )
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202 return file_uid
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203
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204
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205 if sys.version_info >= (3, 4):
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206 from importlib.machinery import EXTENSION_SUFFIXES
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207
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208 def get_extension_suffixes():
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209 return EXTENSION_SUFFIXES
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210 else:
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211 from imp import get_suffixes
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212
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213 def get_extension_suffixes():
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214 return [suffix[0] for suffix in get_suffixes()]
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215
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216
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217 def expanduser(path):
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218 # type: (str) -> str
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219 """
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220 Expand ~ and ~user constructions.
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221
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222 Includes a workaround for https://bugs.python.org/issue14768
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223 """
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224 expanded = os.path.expanduser(path)
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225 if path.startswith('~/') and expanded.startswith('//'):
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226 expanded = expanded[1:]
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227 return expanded
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228
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229
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230 # packages in the stdlib that may have installation metadata, but should not be
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231 # considered 'installed'. this theoretically could be determined based on
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232 # dist.location (py27:`sysconfig.get_paths()['stdlib']`,
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233 # py26:sysconfig.get_config_vars('LIBDEST')), but fear platform variation may
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234 # make this ineffective, so hard-coding
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235 stdlib_pkgs = {"python", "wsgiref", "argparse"}
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236
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237
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238 # windows detection, covers cpython and ironpython
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239 WINDOWS = (sys.platform.startswith("win") or
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240 (sys.platform == 'cli' and os.name == 'nt'))
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241
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242
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243 def samefile(file1, file2):
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244 # type: (str, str) -> bool
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245 """Provide an alternative for os.path.samefile on Windows/Python2"""
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246 if hasattr(os.path, 'samefile'):
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247 return os.path.samefile(file1, file2)
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248 else:
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249 path1 = os.path.normcase(os.path.abspath(file1))
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250 path2 = os.path.normcase(os.path.abspath(file2))
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251 return path1 == path2
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252
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253
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254 if hasattr(shutil, 'get_terminal_size'):
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255 def get_terminal_size():
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256 # type: () -> Tuple[int, int]
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257 """
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258 Returns a tuple (x, y) representing the width(x) and the height(y)
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259 in characters of the terminal window.
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260 """
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261 return tuple(shutil.get_terminal_size()) # type: ignore
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262 else:
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263 def get_terminal_size():
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264 # type: () -> Tuple[int, int]
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265 """
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266 Returns a tuple (x, y) representing the width(x) and the height(y)
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267 in characters of the terminal window.
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268 """
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269 def ioctl_GWINSZ(fd):
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270 try:
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271 import fcntl
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272 import termios
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273 import struct
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274 cr = struct.unpack_from(
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275 'hh',
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276 fcntl.ioctl(fd, termios.TIOCGWINSZ, '12345678')
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277 )
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278 except Exception:
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279 return None
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280 if cr == (0, 0):
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281 return None
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282 return cr
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283 cr = ioctl_GWINSZ(0) or ioctl_GWINSZ(1) or ioctl_GWINSZ(2)
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284 if not cr:
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285 try:
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286 fd = os.open(os.ctermid(), os.O_RDONLY)
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287 cr = ioctl_GWINSZ(fd)
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288 os.close(fd)
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289 except Exception:
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290 pass
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291 if not cr:
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292 cr = (os.environ.get('LINES', 25), os.environ.get('COLUMNS', 80))
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293 return int(cr[1]), int(cr[0])