annotate lib/python3.8/site-packages/pip/_internal/utils/subprocess.py @ 0:9e54283cc701 draft

"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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1 # The following comment should be removed at some point in the future.
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2 # mypy: strict-optional=False
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3
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4 from __future__ import absolute_import
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5
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6 import logging
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7 import os
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8 import subprocess
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9
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10 from pip._vendor.six.moves import shlex_quote
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11
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12 from pip._internal.exceptions import InstallationError
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13 from pip._internal.utils.compat import console_to_str, str_to_display
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14 from pip._internal.utils.logging import subprocess_logger
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15 from pip._internal.utils.misc import HiddenText, path_to_display
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16 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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17 from pip._internal.utils.ui import open_spinner
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18
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19 if MYPY_CHECK_RUNNING:
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20 from typing import (
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21 Any, Callable, Iterable, List, Mapping, Optional, Text, Union,
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22 )
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23 from pip._internal.utils.ui import SpinnerInterface
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24
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25 CommandArgs = List[Union[str, HiddenText]]
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26
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27
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28 LOG_DIVIDER = '----------------------------------------'
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29
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30
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31 def make_command(*args):
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32 # type: (Union[str, HiddenText, CommandArgs]) -> CommandArgs
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33 """
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34 Create a CommandArgs object.
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35 """
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36 command_args = [] # type: CommandArgs
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37 for arg in args:
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38 # Check for list instead of CommandArgs since CommandArgs is
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39 # only known during type-checking.
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40 if isinstance(arg, list):
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41 command_args.extend(arg)
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42 else:
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43 # Otherwise, arg is str or HiddenText.
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44 command_args.append(arg)
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45
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46 return command_args
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47
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48
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49 def format_command_args(args):
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50 # type: (Union[List[str], CommandArgs]) -> str
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51 """
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52 Format command arguments for display.
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53 """
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54 # For HiddenText arguments, display the redacted form by calling str().
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55 # Also, we don't apply str() to arguments that aren't HiddenText since
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56 # this can trigger a UnicodeDecodeError in Python 2 if the argument
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57 # has type unicode and includes a non-ascii character. (The type
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58 # checker doesn't ensure the annotations are correct in all cases.)
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59 return ' '.join(
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60 shlex_quote(str(arg)) if isinstance(arg, HiddenText)
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61 else shlex_quote(arg) for arg in args
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62 )
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63
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64
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65 def reveal_command_args(args):
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66 # type: (Union[List[str], CommandArgs]) -> List[str]
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67 """
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68 Return the arguments in their raw, unredacted form.
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69 """
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70 return [
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71 arg.secret if isinstance(arg, HiddenText) else arg for arg in args
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72 ]
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73
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74
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75 def make_subprocess_output_error(
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76 cmd_args, # type: Union[List[str], CommandArgs]
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77 cwd, # type: Optional[str]
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78 lines, # type: List[Text]
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79 exit_status, # type: int
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80 ):
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81 # type: (...) -> Text
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82 """
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83 Create and return the error message to use to log a subprocess error
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84 with command output.
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85
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86 :param lines: A list of lines, each ending with a newline.
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87 """
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88 command = format_command_args(cmd_args)
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89 # Convert `command` and `cwd` to text (unicode in Python 2) so we can use
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90 # them as arguments in the unicode format string below. This avoids
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91 # "UnicodeDecodeError: 'ascii' codec can't decode byte ..." in Python 2
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92 # if either contains a non-ascii character.
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93 command_display = str_to_display(command, desc='command bytes')
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94 cwd_display = path_to_display(cwd)
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95
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96 # We know the joined output value ends in a newline.
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97 output = ''.join(lines)
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98 msg = (
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99 # Use a unicode string to avoid "UnicodeEncodeError: 'ascii'
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100 # codec can't encode character ..." in Python 2 when a format
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101 # argument (e.g. `output`) has a non-ascii character.
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102 u'Command errored out with exit status {exit_status}:\n'
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103 ' command: {command_display}\n'
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104 ' cwd: {cwd_display}\n'
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105 'Complete output ({line_count} lines):\n{output}{divider}'
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106 ).format(
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107 exit_status=exit_status,
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108 command_display=command_display,
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109 cwd_display=cwd_display,
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110 line_count=len(lines),
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111 output=output,
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112 divider=LOG_DIVIDER,
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113 )
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114 return msg
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115
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116
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117 def call_subprocess(
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118 cmd, # type: Union[List[str], CommandArgs]
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119 show_stdout=False, # type: bool
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120 cwd=None, # type: Optional[str]
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121 on_returncode='raise', # type: str
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122 extra_ok_returncodes=None, # type: Optional[Iterable[int]]
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123 command_desc=None, # type: Optional[str]
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124 extra_environ=None, # type: Optional[Mapping[str, Any]]
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125 unset_environ=None, # type: Optional[Iterable[str]]
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126 spinner=None, # type: Optional[SpinnerInterface]
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127 log_failed_cmd=True # type: Optional[bool]
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128 ):
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129 # type: (...) -> Text
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130 """
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131 Args:
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132 show_stdout: if true, use INFO to log the subprocess's stderr and
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133 stdout streams. Otherwise, use DEBUG. Defaults to False.
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134 extra_ok_returncodes: an iterable of integer return codes that are
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135 acceptable, in addition to 0. Defaults to None, which means [].
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136 unset_environ: an iterable of environment variable names to unset
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137 prior to calling subprocess.Popen().
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138 log_failed_cmd: if false, failed commands are not logged, only raised.
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139 """
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140 if extra_ok_returncodes is None:
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141 extra_ok_returncodes = []
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142 if unset_environ is None:
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143 unset_environ = []
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144 # Most places in pip use show_stdout=False. What this means is--
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145 #
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146 # - We connect the child's output (combined stderr and stdout) to a
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147 # single pipe, which we read.
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148 # - We log this output to stderr at DEBUG level as it is received.
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149 # - If DEBUG logging isn't enabled (e.g. if --verbose logging wasn't
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150 # requested), then we show a spinner so the user can still see the
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151 # subprocess is in progress.
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152 # - If the subprocess exits with an error, we log the output to stderr
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153 # at ERROR level if it hasn't already been displayed to the console
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154 # (e.g. if --verbose logging wasn't enabled). This way we don't log
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155 # the output to the console twice.
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156 #
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157 # If show_stdout=True, then the above is still done, but with DEBUG
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158 # replaced by INFO.
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159 if show_stdout:
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160 # Then log the subprocess output at INFO level.
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161 log_subprocess = subprocess_logger.info
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162 used_level = logging.INFO
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163 else:
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164 # Then log the subprocess output using DEBUG. This also ensures
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165 # it will be logged to the log file (aka user_log), if enabled.
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166 log_subprocess = subprocess_logger.debug
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167 used_level = logging.DEBUG
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168
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169 # Whether the subprocess will be visible in the console.
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170 showing_subprocess = subprocess_logger.getEffectiveLevel() <= used_level
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171
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172 # Only use the spinner if we're not showing the subprocess output
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173 # and we have a spinner.
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174 use_spinner = not showing_subprocess and spinner is not None
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175
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176 if command_desc is None:
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177 command_desc = format_command_args(cmd)
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178
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179 log_subprocess("Running command %s", command_desc)
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180 env = os.environ.copy()
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181 if extra_environ:
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182 env.update(extra_environ)
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183 for name in unset_environ:
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184 env.pop(name, None)
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185 try:
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186 proc = subprocess.Popen(
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187 # Convert HiddenText objects to the underlying str.
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188 reveal_command_args(cmd),
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189 stderr=subprocess.STDOUT, stdin=subprocess.PIPE,
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190 stdout=subprocess.PIPE, cwd=cwd, env=env,
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191 )
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192 proc.stdin.close()
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193 except Exception as exc:
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194 if log_failed_cmd:
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195 subprocess_logger.critical(
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196 "Error %s while executing command %s", exc, command_desc,
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197 )
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198 raise
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199 all_output = []
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200 while True:
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201 # The "line" value is a unicode string in Python 2.
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202 line = console_to_str(proc.stdout.readline())
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203 if not line:
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204 break
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205 line = line.rstrip()
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206 all_output.append(line + '\n')
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207
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208 # Show the line immediately.
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209 log_subprocess(line)
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210 # Update the spinner.
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211 if use_spinner:
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212 spinner.spin()
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213 try:
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214 proc.wait()
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215 finally:
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216 if proc.stdout:
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217 proc.stdout.close()
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218 proc_had_error = (
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219 proc.returncode and proc.returncode not in extra_ok_returncodes
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220 )
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221 if use_spinner:
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222 if proc_had_error:
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223 spinner.finish("error")
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224 else:
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225 spinner.finish("done")
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226 if proc_had_error:
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227 if on_returncode == 'raise':
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228 if not showing_subprocess and log_failed_cmd:
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229 # Then the subprocess streams haven't been logged to the
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230 # console yet.
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231 msg = make_subprocess_output_error(
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232 cmd_args=cmd,
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233 cwd=cwd,
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234 lines=all_output,
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235 exit_status=proc.returncode,
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236 )
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237 subprocess_logger.error(msg)
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238 exc_msg = (
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239 'Command errored out with exit status {}: {} '
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240 'Check the logs for full command output.'
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241 ).format(proc.returncode, command_desc)
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242 raise InstallationError(exc_msg)
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243 elif on_returncode == 'warn':
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244 subprocess_logger.warning(
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245 'Command "%s" had error code %s in %s',
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246 command_desc, proc.returncode, cwd,
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247 )
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248 elif on_returncode == 'ignore':
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249 pass
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250 else:
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251 raise ValueError('Invalid value: on_returncode=%s' %
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252 repr(on_returncode))
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253 return ''.join(all_output)
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254
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255
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256 def runner_with_spinner_message(message):
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257 # type: (str) -> Callable[..., None]
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258 """Provide a subprocess_runner that shows a spinner message.
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259
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260 Intended for use with for pep517's Pep517HookCaller. Thus, the runner has
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261 an API that matches what's expected by Pep517HookCaller.subprocess_runner.
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262 """
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263
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264 def runner(
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265 cmd, # type: List[str]
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266 cwd=None, # type: Optional[str]
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267 extra_environ=None # type: Optional[Mapping[str, Any]]
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268 ):
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269 # type: (...) -> None
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270 with open_spinner(message) as spinner:
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271 call_subprocess(
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272 cmd,
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273 cwd=cwd,
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274 extra_environ=extra_environ,
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275 spinner=spinner,
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276 )
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277
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278 return runner