Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/pip/req/req_set.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 from __future__ import absolute_import
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2
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3 from collections import defaultdict
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4 import functools
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5 import itertools
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6 import logging
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7 import os
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8
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9 from pip._vendor import pkg_resources
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10 from pip._vendor import requests
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11
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12 from pip.download import (url_to_path, unpack_url)
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13 from pip.exceptions import (InstallationError, BestVersionAlreadyInstalled,
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14 DistributionNotFound, PreviousBuildDirError)
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15 from pip.locations import (PIP_DELETE_MARKER_FILENAME, build_prefix)
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16 from pip.req.req_install import InstallRequirement
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17 from pip.utils import (display_path, rmtree, dist_in_usersite, normalize_path)
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18 from pip.utils.logging import indent_log
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19 from pip.vcs import vcs
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20
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21
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22 logger = logging.getLogger(__name__)
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23
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24
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25 class Requirements(object):
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26
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27 def __init__(self):
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28 self._keys = []
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29 self._dict = {}
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30
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31 def keys(self):
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32 return self._keys
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33
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34 def values(self):
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35 return [self._dict[key] for key in self._keys]
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36
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37 def __contains__(self, item):
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38 return item in self._keys
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39
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40 def __setitem__(self, key, value):
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41 if key not in self._keys:
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42 self._keys.append(key)
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43 self._dict[key] = value
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44
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45 def __getitem__(self, key):
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46 return self._dict[key]
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47
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48 def __repr__(self):
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49 values = ['%s: %s' % (repr(k), repr(self[k])) for k in self.keys()]
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50 return 'Requirements({%s})' % ', '.join(values)
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51
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52
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53 class DistAbstraction(object):
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54 """Abstracts out the wheel vs non-wheel prepare_files logic.
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55
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56 The requirements for anything installable are as follows:
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57 - we must be able to determine the requirement name
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58 (or we can't correctly handle the non-upgrade case).
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59 - we must be able to generate a list of run-time dependencies
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60 without installing any additional packages (or we would
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61 have to either burn time by doing temporary isolated installs
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62 or alternatively violate pips 'don't start installing unless
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63 all requirements are available' rule - neither of which are
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64 desirable).
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65 - for packages with setup requirements, we must also be able
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66 to determine their requirements without installing additional
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67 packages (for the same reason as run-time dependencies)
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68 - we must be able to create a Distribution object exposing the
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69 above metadata.
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70 """
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71
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72 def __init__(self, req_to_install):
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73 self.req_to_install = req_to_install
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74
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75 def dist(self, finder):
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76 """Return a setuptools Dist object."""
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77 raise NotImplementedError(self.dist)
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78
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79 def prep_for_dist(self):
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80 """Ensure that we can get a Dist for this requirement."""
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81 raise NotImplementedError(self.dist)
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82
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83
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84 def make_abstract_dist(req_to_install):
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85 """Factory to make an abstract dist object.
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86
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87 Preconditions: Either an editable req with a source_dir, or satisfied_by or
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88 a wheel link, or a non-editable req with a source_dir.
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89
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90 :return: A concrete DistAbstraction.
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91 """
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92 if req_to_install.editable:
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93 return IsSDist(req_to_install)
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94 elif req_to_install.link and req_to_install.link.is_wheel:
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95 return IsWheel(req_to_install)
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96 else:
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97 return IsSDist(req_to_install)
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98
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99
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100 class IsWheel(DistAbstraction):
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101
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102 def dist(self, finder):
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103 return list(pkg_resources.find_distributions(
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104 self.req_to_install.source_dir))[0]
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105
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106 def prep_for_dist(self):
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107 # FIXME:https://github.com/pypa/pip/issues/1112
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108 pass
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109
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110
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111 class IsSDist(DistAbstraction):
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112
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113 def dist(self, finder):
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114 dist = self.req_to_install.get_dist()
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115 # FIXME: shouldn't be globally added:
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116 if dist.has_metadata('dependency_links.txt'):
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117 finder.add_dependency_links(
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118 dist.get_metadata_lines('dependency_links.txt')
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119 )
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120 return dist
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121
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122 def prep_for_dist(self):
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123 self.req_to_install.run_egg_info()
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124 self.req_to_install.assert_source_matches_version()
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125
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126
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127 class Installed(DistAbstraction):
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128
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129 def dist(self, finder):
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130 return self.req_to_install.satisfied_by
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131
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132 def prep_for_dist(self):
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133 pass
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134
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135
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136 class RequirementSet(object):
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137
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138 def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
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139 ignore_installed=False, as_egg=False, target_dir=None,
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140 ignore_dependencies=False, force_reinstall=False,
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141 use_user_site=False, session=None, pycompile=True,
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142 isolated=False, wheel_download_dir=None):
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143 if session is None:
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144 raise TypeError(
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145 "RequirementSet() missing 1 required keyword argument: "
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146 "'session'"
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147 )
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148
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149 self.build_dir = build_dir
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150 self.src_dir = src_dir
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151 # XXX: download_dir and wheel_download_dir overlap semantically and may
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152 # be combinable.
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153 self.download_dir = download_dir
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154 self.upgrade = upgrade
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155 self.ignore_installed = ignore_installed
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156 self.force_reinstall = force_reinstall
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157 self.requirements = Requirements()
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158 # Mapping of alias: real_name
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159 self.requirement_aliases = {}
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160 self.unnamed_requirements = []
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161 self.ignore_dependencies = ignore_dependencies
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162 self.successfully_downloaded = []
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163 self.successfully_installed = []
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164 self.reqs_to_cleanup = []
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165 self.as_egg = as_egg
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166 self.use_user_site = use_user_site
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167 self.target_dir = target_dir # set from --target option
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168 self.session = session
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169 self.pycompile = pycompile
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170 self.isolated = isolated
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171 if wheel_download_dir:
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172 wheel_download_dir = normalize_path(wheel_download_dir)
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173 self.wheel_download_dir = wheel_download_dir
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174 # Maps from install_req -> dependencies_of_install_req
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175 self._dependencies = defaultdict(list)
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176
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177 def __str__(self):
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178 reqs = [req for req in self.requirements.values()
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179 if not req.comes_from]
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180 reqs.sort(key=lambda req: req.name.lower())
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181 return ' '.join([str(req.req) for req in reqs])
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182
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183 def __repr__(self):
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184 reqs = [req for req in self.requirements.values()]
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185 reqs.sort(key=lambda req: req.name.lower())
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186 reqs_str = ', '.join([str(req.req) for req in reqs])
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187 return ('<%s object; %d requirement(s): %s>'
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188 % (self.__class__.__name__, len(reqs), reqs_str))
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189
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190 def add_requirement(self, install_req, parent_req_name=None):
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191 """Add install_req as a requirement to install.
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192
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193 :param parent_req_name: The name of the requirement that needed this
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194 added. The name is used because when multiple unnamed requirements
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195 resolve to the same name, we could otherwise end up with dependency
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196 links that point outside the Requirements set. parent_req must
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197 already be added. Note that None implies that this is a user
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198 supplied requirement, vs an inferred one.
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199 :return: Additional requirements to scan. That is either [] if
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200 the requirement is not applicable, or [install_req] if the
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201 requirement is applicable and has just been added.
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202 """
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203 name = install_req.name
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204 if ((not name or not self.has_requirement(name)) and not
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205 install_req.match_markers()):
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206 # Only log if we haven't already got install_req from somewhere.
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207 logger.debug("Ignore %s: markers %r don't match",
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208 install_req.name, install_req.markers)
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209 return []
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210
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211 install_req.as_egg = self.as_egg
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212 install_req.use_user_site = self.use_user_site
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213 install_req.target_dir = self.target_dir
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214 install_req.pycompile = self.pycompile
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215 if not name:
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216 # url or path requirement w/o an egg fragment
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217 self.unnamed_requirements.append(install_req)
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218 return [install_req]
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219 else:
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220 if parent_req_name is None and self.has_requirement(name):
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221 raise InstallationError(
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222 'Double requirement given: %s (already in %s, name=%r)'
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223 % (install_req, self.get_requirement(name), name))
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224 if not self.has_requirement(name):
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225 # Add requirement
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226 self.requirements[name] = install_req
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227 # FIXME: what about other normalizations? E.g., _ vs. -?
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228 if name.lower() != name:
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229 self.requirement_aliases[name.lower()] = name
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230 result = [install_req]
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231 else:
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232 # Canonicalise to the already-added object
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233 install_req = self.get_requirement(name)
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234 # No need to scan, this is a duplicate requirement.
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235 result = []
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236 if parent_req_name:
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237 parent_req = self.get_requirement(parent_req_name)
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238 self._dependencies[parent_req].append(install_req)
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239 return result
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240
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241 def has_requirement(self, project_name):
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242 for name in project_name, project_name.lower():
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243 if name in self.requirements or name in self.requirement_aliases:
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244 return True
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245 return False
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246
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247 @property
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248 def has_requirements(self):
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249 return list(self.requirements.values()) or self.unnamed_requirements
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250
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251 @property
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252 def is_download(self):
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253 if self.download_dir:
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254 self.download_dir = os.path.expanduser(self.download_dir)
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255 if os.path.exists(self.download_dir):
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256 return True
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257 else:
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258 logger.critical('Could not find download directory')
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259 raise InstallationError(
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260 "Could not find or access download directory '%s'"
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261 % display_path(self.download_dir))
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262 return False
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263
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264 def get_requirement(self, project_name):
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265 for name in project_name, project_name.lower():
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266 if name in self.requirements:
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267 return self.requirements[name]
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268 if name in self.requirement_aliases:
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269 return self.requirements[self.requirement_aliases[name]]
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270 raise KeyError("No project with the name %r" % project_name)
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271
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272 def uninstall(self, auto_confirm=False):
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273 for req in self.requirements.values():
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274 req.uninstall(auto_confirm=auto_confirm)
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275 req.commit_uninstall()
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276
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277 def _walk_req_to_install(self, handler):
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278 """Call handler for all pending reqs.
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279
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280 :param handler: Handle a single requirement. Should take a requirement
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281 to install. Can optionally return an iterable of additional
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282 InstallRequirements to cover.
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283 """
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284 # The list() here is to avoid potential mutate-while-iterating bugs.
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285 discovered_reqs = []
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286 reqs = itertools.chain(
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287 list(self.unnamed_requirements), list(self.requirements.values()),
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288 discovered_reqs)
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289 for req_to_install in reqs:
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290 more_reqs = handler(req_to_install)
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291 if more_reqs:
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292 discovered_reqs.extend(more_reqs)
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293
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294 def locate_files(self):
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295 """Remove in 7.0: used by --no-download"""
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296 self._walk_req_to_install(self._locate_file)
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297
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298 def _locate_file(self, req_to_install):
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299 install_needed = True
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300 if not self.ignore_installed and not req_to_install.editable:
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301 req_to_install.check_if_exists()
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302 if req_to_install.satisfied_by:
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303 if self.upgrade:
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304 # don't uninstall conflict if user install and
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305 # conflict is not user install
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306 if not (self.use_user_site and
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307 not dist_in_usersite(
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308 req_to_install.satisfied_by
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309 )):
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310 req_to_install.conflicts_with = \
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311 req_to_install.satisfied_by
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312 req_to_install.satisfied_by = None
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313 else:
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314 install_needed = False
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315 logger.info(
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316 'Requirement already satisfied (use --upgrade to '
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317 'upgrade): %s',
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318 req_to_install,
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319 )
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320
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321 if req_to_install.editable:
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322 if req_to_install.source_dir is None:
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323 req_to_install.source_dir = req_to_install.build_location(
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324 self.src_dir
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325 )
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326 elif install_needed:
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327 req_to_install.source_dir = req_to_install.build_location(
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328 self.build_dir,
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329 )
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330
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331 if (req_to_install.source_dir is not None and not
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332 os.path.isdir(req_to_install.source_dir)):
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333 raise InstallationError(
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334 'Could not install requirement %s because source folder %s'
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335 ' does not exist (perhaps --no-download was used without '
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336 'first running an equivalent install with --no-install?)' %
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337 (req_to_install, req_to_install.source_dir)
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338 )
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339
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340 def prepare_files(self, finder):
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341 """
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342 Prepare process. Create temp directories, download and/or unpack files.
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343 """
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344 self._walk_req_to_install(
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345 functools.partial(self._prepare_file, finder))
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346
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347 def _check_skip_installed(self, req_to_install, finder):
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348 """Check if req_to_install should be skipped.
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349
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350 This will check if the req is installed, and whether we should upgrade
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351 or reinstall it, taking into account all the relevant user options.
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352
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353 After calling this req_to_install will only have satisfied_by set to
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354 None if the req_to_install is to be upgraded/reinstalled etc. Any
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355 other value will be a dist recording the current thing installed that
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356 satisfies the requirement.
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357
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358 Note that for vcs urls and the like we can't assess skipping in this
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359 routine - we simply identify that we need to pull the thing down,
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360 then later on it is pulled down and introspected to assess upgrade/
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361 reinstalls etc.
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362
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363 :return: A text reason for why it was skipped, or None.
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364 """
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365 # Check whether to upgrade/reinstall this req or not.
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366 req_to_install.check_if_exists()
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367 if req_to_install.satisfied_by:
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368 skip_reason = 'satisfied (use --upgrade to upgrade)'
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369 if self.upgrade:
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370 best_installed = False
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371 # For link based requirements we have to pull the
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372 # tree down and inspect to assess the version #, so
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373 # its handled way down.
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374 if not (self.force_reinstall or req_to_install.link):
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375 try:
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376 finder.find_requirement(req_to_install, self.upgrade)
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377 except BestVersionAlreadyInstalled:
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378 skip_reason = 'up-to-date'
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379 best_installed = True
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380 except DistributionNotFound:
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381 # No distribution found, so we squash the
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382 # error - it will be raised later when we
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383 # re-try later to do the install.
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384 # Why don't we just raise here?
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385 pass
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386
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387 if not best_installed:
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388 # don't uninstall conflict if user install and
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389 # conflict is not user install
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390 if not (self.use_user_site and not
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391 dist_in_usersite(req_to_install.satisfied_by)):
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392 req_to_install.conflicts_with = \
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393 req_to_install.satisfied_by
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394 req_to_install.satisfied_by = None
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395 return skip_reason
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396 else:
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397 return None
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398
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399 def _prepare_file(self, finder, req_to_install):
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400 """Prepare a single requirements files.
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401
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402 :return: A list of addition InstallRequirements to also install.
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403 """
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404 # Tell user what we are doing for this requirement:
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405 # obtain (editable), skipping, processing (local url), collecting
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406 # (remote url or package name)
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407 if req_to_install.editable:
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408 logger.info('Obtaining %s', req_to_install)
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409 else:
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410 # satisfied_by is only evaluated by calling _check_skip_installed,
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411 # so it must be None here.
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412 assert req_to_install.satisfied_by is None
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413 if not self.ignore_installed:
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414 skip_reason = self._check_skip_installed(
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415 req_to_install, finder)
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416
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417 if req_to_install.satisfied_by:
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418 assert skip_reason is not None, (
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419 '_check_skip_installed returned None but '
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420 'req_to_install.satisfied_by is set to %r'
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421 % (req_to_install.satisfied_by,))
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422 logger.info(
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423 'Requirement already %s: %s', skip_reason,
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424 req_to_install)
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425 else:
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426 if (req_to_install.link and
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427 req_to_install.link.scheme == 'file'):
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428 path = url_to_path(req_to_install.link.url)
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429 logger.info('Processing %s', display_path(path))
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430 else:
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431 logger.info('Collecting %s', req_to_install)
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432
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433 with indent_log():
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434 # ################################ #
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435 # # vcs update or unpack archive # #
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436 # ################################ #
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437 if req_to_install.editable:
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438 req_to_install.ensure_has_source_dir(self.src_dir)
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439 req_to_install.update_editable(not self.is_download)
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440 abstract_dist = make_abstract_dist(req_to_install)
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441 abstract_dist.prep_for_dist()
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442 if self.is_download:
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443 req_to_install.archive(self.download_dir)
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444 elif req_to_install.satisfied_by:
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445 abstract_dist = Installed(req_to_install)
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446 else:
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447 # @@ if filesystem packages are not marked
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448 # editable in a req, a non deterministic error
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449 # occurs when the script attempts to unpack the
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450 # build directory
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451 req_to_install.ensure_has_source_dir(self.build_dir)
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452 # If a checkout exists, it's unwise to keep going. version
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453 # inconsistencies are logged later, but do not fail the
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454 # installation.
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455 # FIXME: this won't upgrade when there's an existing
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456 # package unpacked in `req_to_install.source_dir`
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457 if os.path.exists(
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458 os.path.join(req_to_install.source_dir, 'setup.py')):
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parents:
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459 raise PreviousBuildDirError(
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
460 "pip can't proceed with requirements '%s' due to a"
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461 " pre-existing build directory (%s). This is "
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parents:
diff changeset
462 "likely due to a previous installation that failed"
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463 ". pip is being responsible and not assuming it "
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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464 "can delete this. Please delete it and try again."
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465 % (req_to_install, req_to_install.source_dir)
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466 )
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467 req_to_install.populate_link(finder, self.upgrade)
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468 # We can't hit this spot and have populate_link return None.
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469 # req_to_install.satisfied_by is None here (because we're
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470 # guarded) and upgrade has no impact except when satisfied_by
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parents:
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471 # is not None.
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472 # Then inside find_requirement existing_applicable -> False
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473 # If no new versions are found, DistributionNotFound is raised,
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474 # otherwise a result is guaranteed.
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475 assert req_to_install.link
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476 try:
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477 if req_to_install.link.is_wheel and \
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478 self.wheel_download_dir:
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479 # when doing 'pip wheel`
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480 download_dir = self.wheel_download_dir
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481 do_download = True
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482 else:
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483 download_dir = self.download_dir
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484 do_download = self.is_download
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parents:
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485 unpack_url(
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486 req_to_install.link, req_to_install.source_dir,
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487 download_dir, do_download, session=self.session,
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488 )
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489 except requests.HTTPError as exc:
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490 logger.critical(
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491 'Could not install requirement %s because '
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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492 'of error %s',
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493 req_to_install,
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494 exc,
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495 )
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496 raise InstallationError(
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497 'Could not install requirement %s because '
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498 'of HTTP error %s for URL %s' %
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499 (req_to_install, exc, req_to_install.link)
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500 )
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501 abstract_dist = make_abstract_dist(req_to_install)
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502 abstract_dist.prep_for_dist()
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diff changeset
503 if self.is_download:
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diff changeset
504 # Make a .zip of the source_dir we already created.
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diff changeset
505 if req_to_install.link.scheme in vcs.all_schemes:
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diff changeset
506 req_to_install.archive(self.download_dir)
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parents:
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507 # req_to_install.req is only avail after unpack for URL
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508 # pkgs repeat check_if_exists to uninstall-on-upgrade
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diff changeset
509 # (#14)
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parents:
diff changeset
510 if not self.ignore_installed:
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parents:
diff changeset
511 req_to_install.check_if_exists()
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parents:
diff changeset
512 if req_to_install.satisfied_by:
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parents:
diff changeset
513 if self.upgrade or self.ignore_installed:
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parents:
diff changeset
514 # don't uninstall conflict if user install and
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diff changeset
515 # conflict is not user install
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516 if not (self.use_user_site and not
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parents:
diff changeset
517 dist_in_usersite(
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diff changeset
518 req_to_install.satisfied_by)):
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diff changeset
519 req_to_install.conflicts_with = \
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diff changeset
520 req_to_install.satisfied_by
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521 req_to_install.satisfied_by = None
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diff changeset
522 else:
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523 logger.info(
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524 'Requirement already satisfied (use '
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525 '--upgrade to upgrade): %s',
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diff changeset
526 req_to_install,
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527 )
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528
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529 # ###################### #
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530 # # parse dependencies # #
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531 # ###################### #
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532 dist = abstract_dist.dist(finder)
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533 more_reqs = []
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534
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535 def add_req(subreq):
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536 sub_install_req = InstallRequirement(
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537 str(subreq),
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538 req_to_install,
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539 isolated=self.isolated,
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540 )
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541 more_reqs.extend(self.add_requirement(
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542 sub_install_req, req_to_install.name))
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543
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parents:
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544 # We add req_to_install before its dependencies, so that we
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545 # can refer to it when adding dependencies.
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546 if not self.has_requirement(req_to_install.name):
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547 # 'unnamed' requirements will get added here
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548 self.add_requirement(req_to_install, None)
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549
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550 if not self.ignore_dependencies:
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551 if (req_to_install.extras):
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552 logger.debug(
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553 "Installing extra requirements: %r",
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554 ','.join(req_to_install.extras),
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555 )
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556 missing_requested = sorted(
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parents:
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557 set(req_to_install.extras) - set(dist.extras)
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558 )
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559 for missing in missing_requested:
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560 logger.warning(
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561 '%s does not provide the extra \'%s\'',
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562 dist, missing
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parents:
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563 )
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parents:
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564
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565 available_requested = sorted(
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566 set(dist.extras) & set(req_to_install.extras)
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567 )
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568 for subreq in dist.requires(available_requested):
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parents:
diff changeset
569 add_req(subreq)
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parents:
diff changeset
570
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571 # cleanup tmp src
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parents:
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572 self.reqs_to_cleanup.append(req_to_install)
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parents:
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573
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574 if not req_to_install.editable and not req_to_install.satisfied_by:
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parents:
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575 # XXX: --no-install leads this to report 'Successfully
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parents:
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576 # downloaded' for only non-editable reqs, even though we took
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parents:
diff changeset
577 # action on them.
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parents:
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578 self.successfully_downloaded.append(req_to_install)
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parents:
diff changeset
579
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bcclaywell
parents:
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580 return more_reqs
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parents:
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581
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parents:
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582 def cleanup_files(self):
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parents:
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583 """Clean up files, remove builds."""
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584 logger.debug('Cleaning up...')
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parents:
diff changeset
585 with indent_log():
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bcclaywell
parents:
diff changeset
586 for req in self.reqs_to_cleanup:
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parents:
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587 req.remove_temporary_source()
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parents:
diff changeset
588
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parents:
diff changeset
589 if self._pip_has_created_build_dir():
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
590 logger.debug('Removing temporary dir %s...', self.build_dir)
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parents:
diff changeset
591 rmtree(self.build_dir)
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parents:
diff changeset
592
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parents:
diff changeset
593 def _pip_has_created_build_dir(self):
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bcclaywell
parents:
diff changeset
594 return (
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bcclaywell
parents:
diff changeset
595 self.build_dir == build_prefix and
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parents:
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596 os.path.exists(
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parents:
diff changeset
597 os.path.join(self.build_dir, PIP_DELETE_MARKER_FILENAME)
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parents:
diff changeset
598 )
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bcclaywell
parents:
diff changeset
599 )
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bcclaywell
parents:
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600
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parents:
diff changeset
601 def _to_install(self):
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parents:
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602 """Create the installation order.
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parents:
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603
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parents:
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604 The installation order is topological - requirements are installed
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
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605 before the requiring thing. We break cycles at an arbitrary point,
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parents:
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606 and make no other guarantees.
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bcclaywell
parents:
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607 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
608 # The current implementation, which we may change at any point
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parents:
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609 # installs the user specified things in the order given, except when
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parents:
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610 # dependencies must come earlier to achieve topological order.
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parents:
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611 order = []
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parents:
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612 ordered_reqs = set()
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parents:
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613
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parents:
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614 def schedule(req):
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parents:
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615 if req.satisfied_by or req in ordered_reqs:
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616 return
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parents:
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617 ordered_reqs.add(req)
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parents:
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618 for dep in self._dependencies[req]:
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parents:
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619 schedule(dep)
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parents:
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620 order.append(req)
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621 for install_req in self.requirements.values():
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parents:
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622 schedule(install_req)
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parents:
diff changeset
623 return order
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parents:
diff changeset
624
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parents:
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625 def install(self, install_options, global_options=(), *args, **kwargs):
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parents:
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626 """
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parents:
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627 Install everything in this set (after having downloaded and unpacked
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parents:
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628 the packages)
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parents:
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629 """
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parents:
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630 to_install = self._to_install()
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631
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632 # DISTRIBUTE TO SETUPTOOLS UPGRADE HACK (1 of 3 parts)
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633 # move the distribute-0.7.X wrapper to the end because it does not
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634 # install a setuptools package. by moving it to the end, we ensure it's
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635 # setuptools dependency is handled first, which will provide the
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636 # setuptools package
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637 # TODO: take this out later
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638 distribute_req = pkg_resources.Requirement.parse("distribute>=0.7")
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639 for req in to_install:
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640 if (req.name == 'distribute' and
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641 req.installed_version is not None and
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642 req.installed_version in distribute_req):
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643 to_install.remove(req)
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644 to_install.append(req)
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645
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646 if to_install:
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647 logger.info(
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648 'Installing collected packages: %s',
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649 ', '.join([req.name for req in to_install]),
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650 )
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651
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652 with indent_log():
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653 for requirement in to_install:
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654
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655 # DISTRIBUTE TO SETUPTOOLS UPGRADE HACK (1 of 3 parts)
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656 # when upgrading from distribute-0.6.X to the new merged
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657 # setuptools in py2, we need to force setuptools to uninstall
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658 # distribute. In py3, which is always using distribute, this
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659 # conversion is already happening in distribute's
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660 # pkg_resources. It's ok *not* to check if setuptools>=0.7
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661 # because if someone were actually trying to ugrade from
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662 # distribute to setuptools 0.6.X, then all this could do is
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663 # actually help, although that upgade path was certainly never
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664 # "supported"
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665 # TODO: remove this later
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666 if requirement.name == 'setuptools':
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667 try:
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668 # only uninstall distribute<0.7. For >=0.7, setuptools
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669 # will also be present, and that's what we need to
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670 # uninstall
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671 distribute_requirement = \
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672 pkg_resources.Requirement.parse("distribute<0.7")
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673 existing_distribute = \
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674 pkg_resources.get_distribution("distribute")
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675 if existing_distribute in distribute_requirement:
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676 requirement.conflicts_with = existing_distribute
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677 except pkg_resources.DistributionNotFound:
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678 # distribute wasn't installed, so nothing to do
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679 pass
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680
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681 if requirement.conflicts_with:
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682 logger.info(
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683 'Found existing installation: %s',
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684 requirement.conflicts_with,
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685 )
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686 with indent_log():
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687 requirement.uninstall(auto_confirm=True)
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688 try:
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689 requirement.install(
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690 install_options,
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691 global_options,
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692 *args,
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693 **kwargs
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694 )
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695 except:
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696 # if install did not succeed, rollback previous uninstall
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697 if (requirement.conflicts_with and not
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698 requirement.install_succeeded):
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699 requirement.rollback_uninstall()
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700 raise
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701 else:
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702 if (requirement.conflicts_with and
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703 requirement.install_succeeded):
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704 requirement.commit_uninstall()
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705 requirement.remove_temporary_source()
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706
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707 self.successfully_installed = to_install