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annotate planemo/lib/python3.7/site-packages/pip/_internal/operations/prepare.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 """Prepares a distribution for installation
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2 """
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3
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4 import logging
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5 import os
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6
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7 from pip._vendor import requests
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8
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9 from pip._internal.distributions import (
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10 make_distribution_for_install_requirement,
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11 )
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12 from pip._internal.distributions.installed import InstalledDistribution
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13 from pip._internal.download import (
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14 is_dir_url, is_file_url, is_vcs_url, unpack_url, url_to_path,
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15 )
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16 from pip._internal.exceptions import (
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17 DirectoryUrlHashUnsupported, HashUnpinned, InstallationError,
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18 PreviousBuildDirError, VcsHashUnsupported,
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19 )
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20 from pip._internal.utils.compat import expanduser
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21 from pip._internal.utils.hashes import MissingHashes
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22 from pip._internal.utils.logging import indent_log
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23 from pip._internal.utils.misc import display_path, normalize_path
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24 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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25
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26 if MYPY_CHECK_RUNNING:
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27 from typing import Optional
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28
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29 from pip._internal.distributions import AbstractDistribution
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30 from pip._internal.download import PipSession
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31 from pip._internal.index import PackageFinder
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32 from pip._internal.req.req_install import InstallRequirement
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33 from pip._internal.req.req_tracker import RequirementTracker
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34
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35 logger = logging.getLogger(__name__)
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36
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37
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38 class RequirementPreparer(object):
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39 """Prepares a Requirement
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40 """
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41
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42 def __init__(
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43 self,
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44 build_dir, # type: str
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45 download_dir, # type: Optional[str]
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46 src_dir, # type: str
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47 wheel_download_dir, # type: Optional[str]
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48 progress_bar, # type: str
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49 build_isolation, # type: bool
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50 req_tracker # type: RequirementTracker
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51 ):
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52 # type: (...) -> None
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53 super(RequirementPreparer, self).__init__()
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54
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55 self.src_dir = src_dir
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56 self.build_dir = build_dir
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57 self.req_tracker = req_tracker
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58
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59 # Where still packed archives should be written to. If None, they are
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60 # not saved, and are deleted immediately after unpacking.
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61 self.download_dir = download_dir
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62
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63 # Where still-packed .whl files should be written to. If None, they are
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64 # written to the download_dir parameter. Separate to download_dir to
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65 # permit only keeping wheel archives for pip wheel.
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66 if wheel_download_dir:
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67 wheel_download_dir = normalize_path(wheel_download_dir)
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68 self.wheel_download_dir = wheel_download_dir
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69
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70 # NOTE
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71 # download_dir and wheel_download_dir overlap semantically and may
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72 # be combined if we're willing to have non-wheel archives present in
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73 # the wheelhouse output by 'pip wheel'.
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74
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75 self.progress_bar = progress_bar
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76
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77 # Is build isolation allowed?
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78 self.build_isolation = build_isolation
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79
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80 @property
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81 def _download_should_save(self):
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82 # type: () -> bool
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83 # TODO: Modify to reduce indentation needed
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84 if self.download_dir:
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85 self.download_dir = expanduser(self.download_dir)
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86 if os.path.exists(self.download_dir):
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87 return True
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88 else:
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89 logger.critical('Could not find download directory')
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90 raise InstallationError(
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91 "Could not find or access download directory '%s'"
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92 % display_path(self.download_dir))
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93 return False
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94
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95 def prepare_linked_requirement(
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96 self,
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97 req, # type: InstallRequirement
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98 session, # type: PipSession
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99 finder, # type: PackageFinder
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100 upgrade_allowed, # type: bool
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101 require_hashes # type: bool
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102 ):
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103 # type: (...) -> AbstractDistribution
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104 """Prepare a requirement that would be obtained from req.link
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105 """
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106 # TODO: Breakup into smaller functions
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107 if req.link and req.link.scheme == 'file':
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108 path = url_to_path(req.link.url)
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109 logger.info('Processing %s', display_path(path))
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110 else:
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111 logger.info('Collecting %s', req)
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112
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113 with indent_log():
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114 # @@ if filesystem packages are not marked
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115 # editable in a req, a non deterministic error
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116 # occurs when the script attempts to unpack the
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117 # build directory
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118 req.ensure_has_source_dir(self.build_dir)
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119 # If a checkout exists, it's unwise to keep going. version
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120 # inconsistencies are logged later, but do not fail the
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121 # installation.
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122 # FIXME: this won't upgrade when there's an existing
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123 # package unpacked in `req.source_dir`
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124 # package unpacked in `req.source_dir`
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125 if os.path.exists(os.path.join(req.source_dir, 'setup.py')):
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126 raise PreviousBuildDirError(
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127 "pip can't proceed with requirements '%s' due to a"
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128 " pre-existing build directory (%s). This is "
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129 "likely due to a previous installation that failed"
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130 ". pip is being responsible and not assuming it "
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131 "can delete this. Please delete it and try again."
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132 % (req, req.source_dir)
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133 )
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134 req.populate_link(finder, upgrade_allowed, require_hashes)
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135
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136 # We can't hit this spot and have populate_link return None.
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137 # req.satisfied_by is None here (because we're
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138 # guarded) and upgrade has no impact except when satisfied_by
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139 # is not None.
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140 # Then inside find_requirement existing_applicable -> False
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141 # If no new versions are found, DistributionNotFound is raised,
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142 # otherwise a result is guaranteed.
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143 assert req.link
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144 link = req.link
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145
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146 # Now that we have the real link, we can tell what kind of
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147 # requirements we have and raise some more informative errors
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148 # than otherwise. (For example, we can raise VcsHashUnsupported
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149 # for a VCS URL rather than HashMissing.)
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150 if require_hashes:
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151 # We could check these first 2 conditions inside
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152 # unpack_url and save repetition of conditions, but then
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153 # we would report less-useful error messages for
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154 # unhashable requirements, complaining that there's no
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155 # hash provided.
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156 if is_vcs_url(link):
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157 raise VcsHashUnsupported()
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158 elif is_file_url(link) and is_dir_url(link):
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159 raise DirectoryUrlHashUnsupported()
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160 if not req.original_link and not req.is_pinned:
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161 # Unpinned packages are asking for trouble when a new
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162 # version is uploaded. This isn't a security check, but
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163 # it saves users a surprising hash mismatch in the
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164 # future.
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165 #
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166 # file:/// URLs aren't pinnable, so don't complain
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167 # about them not being pinned.
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168 raise HashUnpinned()
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169
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170 hashes = req.hashes(trust_internet=not require_hashes)
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171 if require_hashes and not hashes:
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172 # Known-good hashes are missing for this requirement, so
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173 # shim it with a facade object that will provoke hash
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174 # computation and then raise a HashMissing exception
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175 # showing the user what the hash should be.
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176 hashes = MissingHashes()
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177
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178 try:
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179 download_dir = self.download_dir
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180 # We always delete unpacked sdists after pip ran.
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181 autodelete_unpacked = True
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182 if req.link.is_wheel and self.wheel_download_dir:
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183 # when doing 'pip wheel` we download wheels to a
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184 # dedicated dir.
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185 download_dir = self.wheel_download_dir
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186 if req.link.is_wheel:
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187 if download_dir:
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188 # When downloading, we only unpack wheels to get
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189 # metadata.
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190 autodelete_unpacked = True
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191 else:
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192 # When installing a wheel, we use the unpacked
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193 # wheel.
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194 autodelete_unpacked = False
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195 unpack_url(
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196 req.link, req.source_dir,
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197 download_dir, autodelete_unpacked,
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198 session=session, hashes=hashes,
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199 progress_bar=self.progress_bar
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200 )
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201 except requests.HTTPError as exc:
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202 logger.critical(
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203 'Could not install requirement %s because of error %s',
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204 req,
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205 exc,
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206 )
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207 raise InstallationError(
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208 'Could not install requirement %s because of HTTP '
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209 'error %s for URL %s' %
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210 (req, exc, req.link)
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211 )
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212 abstract_dist = make_distribution_for_install_requirement(req)
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213 with self.req_tracker.track(req):
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214 abstract_dist.prepare_distribution_metadata(
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215 finder, self.build_isolation,
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216 )
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217 if self._download_should_save:
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218 # Make a .zip of the source_dir we already created.
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219 if not req.link.is_artifact:
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220 req.archive(self.download_dir)
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221 return abstract_dist
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222
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223 def prepare_editable_requirement(
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224 self,
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225 req, # type: InstallRequirement
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226 require_hashes, # type: bool
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227 use_user_site, # type: bool
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228 finder # type: PackageFinder
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229 ):
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230 # type: (...) -> AbstractDistribution
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231 """Prepare an editable requirement
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232 """
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233 assert req.editable, "cannot prepare a non-editable req as editable"
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234
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235 logger.info('Obtaining %s', req)
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236
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237 with indent_log():
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238 if require_hashes:
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239 raise InstallationError(
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240 'The editable requirement %s cannot be installed when '
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241 'requiring hashes, because there is no single file to '
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242 'hash.' % req
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243 )
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244 req.ensure_has_source_dir(self.src_dir)
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245 req.update_editable(not self._download_should_save)
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246
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247 abstract_dist = make_distribution_for_install_requirement(req)
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248 with self.req_tracker.track(req):
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249 abstract_dist.prepare_distribution_metadata(
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250 finder, self.build_isolation,
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251 )
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252
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253 if self._download_should_save:
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254 req.archive(self.download_dir)
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255 req.check_if_exists(use_user_site)
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256
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257 return abstract_dist
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258
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259 def prepare_installed_requirement(
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260 self,
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261 req, # type: InstallRequirement
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262 require_hashes, # type: bool
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263 skip_reason # type: str
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264 ):
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265 # type: (...) -> AbstractDistribution
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266 """Prepare an already-installed requirement
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267 """
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268 assert req.satisfied_by, "req should have been satisfied but isn't"
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269 assert skip_reason is not None, (
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270 "did not get skip reason skipped but req.satisfied_by "
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271 "is set to %r" % (req.satisfied_by,)
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272 )
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273 logger.info(
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274 'Requirement %s: %s (%s)',
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275 skip_reason, req, req.satisfied_by.version
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276 )
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277 with indent_log():
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278 if require_hashes:
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279 logger.debug(
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280 'Since it is already installed, we are trusting this '
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281 'package without checking its hash. To ensure a '
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282 'completely repeatable environment, install into an '
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283 'empty virtualenv.'
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284 )
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285 abstract_dist = InstalledDistribution(req)
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286
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287 return abstract_dist