Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/virtualenv/create/creator.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 from __future__ import absolute_import, print_function, unicode_literals
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2
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3 import json
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4 import logging
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5 import os
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6 import sys
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7 from abc import ABCMeta, abstractmethod
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8 from argparse import ArgumentTypeError
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9 from ast import literal_eval
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10 from collections import OrderedDict
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11 from textwrap import dedent
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12
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13 from six import add_metaclass
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14
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15 from virtualenv.discovery.cached_py_info import LogCmd
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16 from virtualenv.info import WIN_CPYTHON_2
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17 from virtualenv.util.path import Path, safe_delete
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18 from virtualenv.util.six import ensure_str, ensure_text
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19 from virtualenv.util.subprocess import run_cmd
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20 from virtualenv.version import __version__
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21
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22 from .pyenv_cfg import PyEnvCfg
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23
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24 HERE = Path(os.path.abspath(__file__)).parent
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25 DEBUG_SCRIPT = HERE / "debug.py"
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26
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27
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28 class CreatorMeta(object):
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29 def __init__(self):
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30 self.error = None
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31
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32
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33 @add_metaclass(ABCMeta)
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34 class Creator(object):
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35 """A class that given a python Interpreter creates a virtual environment"""
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36
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37 def __init__(self, options, interpreter):
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38 """Construct a new virtual environment creator.
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39
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40 :param options: the CLI option as parsed from :meth:`add_parser_arguments`
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41 :param interpreter: the interpreter to create virtual environment from
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42 """
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43 self.interpreter = interpreter
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44 self._debug = None
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45 self.dest = Path(options.dest)
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46 self.clear = options.clear
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47 self.pyenv_cfg = PyEnvCfg.from_folder(self.dest)
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48 self.app_data = options.app_data
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49
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50 def __repr__(self):
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51 return ensure_str(self.__unicode__())
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52
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53 def __unicode__(self):
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54 return "{}({})".format(self.__class__.__name__, ", ".join("{}={}".format(k, v) for k, v in self._args()))
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55
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56 def _args(self):
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57 return [
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58 ("dest", ensure_text(str(self.dest))),
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59 ("clear", self.clear),
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60 ]
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61
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62 @classmethod
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63 def can_create(cls, interpreter):
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64 """Determine if we can create a virtual environment.
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65
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66 :param interpreter: the interpreter in question
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67 :return: ``None`` if we can't create, any other object otherwise that will be forwarded to \
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68 :meth:`add_parser_arguments`
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69 """
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70 return True
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71
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72 @classmethod
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73 def add_parser_arguments(cls, parser, interpreter, meta, app_data):
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74 """Add CLI arguments for the creator.
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75
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76 :param parser: the CLI parser
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77 :param app_data: the application data folder
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78 :param interpreter: the interpreter we're asked to create virtual environment for
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79 :param meta: value as returned by :meth:`can_create`
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80 """
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81 parser.add_argument(
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82 "dest", help="directory to create virtualenv at", type=cls.validate_dest,
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83 )
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84 parser.add_argument(
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85 "--clear",
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86 dest="clear",
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87 action="store_true",
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88 help="remove the destination directory if exist before starting (will overwrite files otherwise)",
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89 default=False,
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90 )
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91
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92 @abstractmethod
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93 def create(self):
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94 """Perform the virtual environment creation."""
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95 raise NotImplementedError
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96
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97 @classmethod
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98 def validate_dest(cls, raw_value):
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99 """No path separator in the path, valid chars and must be write-able"""
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100
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101 def non_write_able(dest, value):
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102 common = Path(*os.path.commonprefix([value.parts, dest.parts]))
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103 raise ArgumentTypeError(
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104 "the destination {} is not write-able at {}".format(dest.relative_to(common), common),
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105 )
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106
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107 # the file system must be able to encode
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108 # note in newer CPython this is always utf-8 https://www.python.org/dev/peps/pep-0529/
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109 encoding = sys.getfilesystemencoding()
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110 refused = OrderedDict()
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111 kwargs = {"errors": "ignore"} if encoding != "mbcs" else {}
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112 for char in ensure_text(raw_value):
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113 try:
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114 trip = char.encode(encoding, **kwargs).decode(encoding)
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115 if trip == char:
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116 continue
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117 raise ValueError(trip)
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118 except ValueError:
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119 refused[char] = None
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120 if refused:
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121 raise ArgumentTypeError(
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122 "the file system codec ({}) cannot handle characters {!r} within {!r}".format(
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123 encoding, "".join(refused.keys()), raw_value,
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124 ),
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125 )
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126 if os.pathsep in raw_value:
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127 raise ArgumentTypeError(
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128 "destination {!r} must not contain the path separator ({}) as this would break "
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129 "the activation scripts".format(raw_value, os.pathsep),
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130 )
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131
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132 value = Path(raw_value)
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133 if value.exists() and value.is_file():
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134 raise ArgumentTypeError("the destination {} already exists and is a file".format(value))
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135 if (3, 3) <= sys.version_info <= (3, 6):
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136 # pre 3.6 resolve is always strict, aka must exists, sidestep by using os.path operation
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137 dest = Path(os.path.realpath(raw_value))
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138 else:
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139 dest = Path(os.path.abspath(str(value))).resolve() # on Windows absolute does not imply resolve so use both
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140 value = dest
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141 while dest:
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142 if dest.exists():
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143 if os.access(ensure_text(str(dest)), os.W_OK):
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144 break
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145 else:
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146 non_write_able(dest, value)
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147 base, _ = dest.parent, dest.name
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148 if base == dest:
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149 non_write_able(dest, value) # pragma: no cover
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150 dest = base
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151 return str(value)
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152
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153 def run(self):
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154 if self.dest.exists() and self.clear:
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155 logging.debug("delete %s", self.dest)
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156 safe_delete(self.dest)
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157 self.create()
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158 self.set_pyenv_cfg()
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159 self.setup_ignore_vcs()
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160
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161 def set_pyenv_cfg(self):
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162 self.pyenv_cfg.content = OrderedDict()
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163 self.pyenv_cfg["home"] = self.interpreter.system_exec_prefix
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164 self.pyenv_cfg["implementation"] = self.interpreter.implementation
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165 self.pyenv_cfg["version_info"] = ".".join(str(i) for i in self.interpreter.version_info)
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166 self.pyenv_cfg["virtualenv"] = __version__
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167
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168 def setup_ignore_vcs(self):
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169 """Generate ignore instructions for version control systems."""
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170 # mark this folder to be ignored by VCS, handle https://www.python.org/dev/peps/pep-0610/#registered-vcs
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171 git_ignore = self.dest / ".gitignore"
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172 if not git_ignore.exists():
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173 git_ignore.write_text(
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174 dedent(
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175 """
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176 # created by virtualenv automatically
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177 *
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178 """,
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179 ).lstrip(),
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180 )
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181 # Mercurial - does not support the .hgignore file inside a subdirectory directly, but only if included via the
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182 # subinclude directive from root, at which point on might as well ignore the directory itself, see
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183 # https://www.selenic.com/mercurial/hgignore.5.html for more details
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184 # Bazaar - does not support ignore files in sub-directories, only at root level via .bzrignore
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185 # Subversion - does not support ignore files, requires direct manipulation with the svn tool
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186
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187 @property
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188 def debug(self):
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189 """
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190 :return: debug information about the virtual environment (only valid after :meth:`create` has run)
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191 """
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192 if self._debug is None and self.exe is not None:
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193 self._debug = get_env_debug_info(self.exe, self.debug_script(), self.app_data)
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194 return self._debug
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195
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196 # noinspection PyMethodMayBeStatic
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197 def debug_script(self):
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198 return DEBUG_SCRIPT
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199
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200
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201 def get_env_debug_info(env_exe, debug_script, app_data):
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202 env = os.environ.copy()
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203 env.pop(str("PYTHONPATH"), None)
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204
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205 with app_data.ensure_extracted(debug_script) as debug_script:
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206 cmd = [str(env_exe), str(debug_script)]
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207 if WIN_CPYTHON_2:
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208 cmd = [ensure_text(i) for i in cmd]
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209 logging.debug(str("debug via %r"), LogCmd(cmd))
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210 code, out, err = run_cmd(cmd)
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211
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212 # noinspection PyBroadException
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213 try:
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214 if code != 0:
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215 result = literal_eval(out)
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216 else:
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217 result = json.loads(out)
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218 if err:
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219 result["err"] = err
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220 except Exception as exception:
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221 return {"out": out, "err": err, "returncode": code, "exception": repr(exception)}
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222 if "sys" in result and "path" in result["sys"]:
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223 del result["sys"]["path"][0]
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224 return result