Mercurial > repos > guerler > hhblits
annotate lib/python3.8/site-packages/pip/_internal/req/constructors.py @ 0:9e54283cc701 draft
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author | guerler |
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date | Mon, 27 Jul 2020 03:47:31 -0400 |
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1 """Backing implementation for InstallRequirement's various constructors |
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2 |
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3 The idea here is that these formed a major chunk of InstallRequirement's size |
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4 so, moving them and support code dedicated to them outside of that class |
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5 helps creates for better understandability for the rest of the code. |
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6 |
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7 These are meant to be used elsewhere within pip to create instances of |
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8 InstallRequirement. |
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9 """ |
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10 |
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11 # The following comment should be removed at some point in the future. |
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12 # mypy: strict-optional=False |
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13 |
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14 import logging |
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15 import os |
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16 import re |
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17 |
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18 from pip._vendor.packaging.markers import Marker |
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19 from pip._vendor.packaging.requirements import InvalidRequirement, Requirement |
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20 from pip._vendor.packaging.specifiers import Specifier |
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21 from pip._vendor.pkg_resources import RequirementParseError, parse_requirements |
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22 |
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23 from pip._internal.exceptions import InstallationError |
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24 from pip._internal.models.index import PyPI, TestPyPI |
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25 from pip._internal.models.link import Link |
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26 from pip._internal.models.wheel import Wheel |
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27 from pip._internal.pyproject import make_pyproject_path |
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28 from pip._internal.req.req_install import InstallRequirement |
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29 from pip._internal.utils.filetypes import ARCHIVE_EXTENSIONS |
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30 from pip._internal.utils.misc import is_installable_dir, splitext |
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31 from pip._internal.utils.typing import MYPY_CHECK_RUNNING |
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32 from pip._internal.utils.urls import path_to_url |
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33 from pip._internal.vcs import is_url, vcs |
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34 |
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35 if MYPY_CHECK_RUNNING: |
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36 from typing import ( |
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37 Any, Dict, Optional, Set, Tuple, Union, |
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38 ) |
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39 from pip._internal.cache import WheelCache |
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40 |
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41 |
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42 __all__ = [ |
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43 "install_req_from_editable", "install_req_from_line", |
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44 "parse_editable" |
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45 ] |
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46 |
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47 logger = logging.getLogger(__name__) |
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48 operators = Specifier._operators.keys() |
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49 |
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50 |
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51 def is_archive_file(name): |
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52 # type: (str) -> bool |
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53 """Return True if `name` is a considered as an archive file.""" |
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54 ext = splitext(name)[1].lower() |
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55 if ext in ARCHIVE_EXTENSIONS: |
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56 return True |
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57 return False |
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58 |
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59 |
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60 def _strip_extras(path): |
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61 # type: (str) -> Tuple[str, Optional[str]] |
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62 m = re.match(r'^(.+)(\[[^\]]+\])$', path) |
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63 extras = None |
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64 if m: |
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65 path_no_extras = m.group(1) |
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66 extras = m.group(2) |
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67 else: |
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68 path_no_extras = path |
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69 |
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70 return path_no_extras, extras |
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71 |
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72 |
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73 def convert_extras(extras): |
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74 # type: (Optional[str]) -> Set[str] |
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75 if not extras: |
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76 return set() |
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77 return Requirement("placeholder" + extras.lower()).extras |
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78 |
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79 |
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80 def parse_editable(editable_req): |
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81 # type: (str) -> Tuple[Optional[str], str, Optional[Set[str]]] |
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82 """Parses an editable requirement into: |
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83 - a requirement name |
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84 - an URL |
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85 - extras |
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86 - editable options |
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87 Accepted requirements: |
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88 svn+http://blahblah@rev#egg=Foobar[baz]&subdirectory=version_subdir |
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89 .[some_extra] |
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90 """ |
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91 |
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92 url = editable_req |
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93 |
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94 # If a file path is specified with extras, strip off the extras. |
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95 url_no_extras, extras = _strip_extras(url) |
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96 |
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97 if os.path.isdir(url_no_extras): |
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98 if not os.path.exists(os.path.join(url_no_extras, 'setup.py')): |
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99 msg = ( |
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100 'File "setup.py" not found. Directory cannot be installed ' |
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101 'in editable mode: {}'.format(os.path.abspath(url_no_extras)) |
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102 ) |
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103 pyproject_path = make_pyproject_path(url_no_extras) |
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104 if os.path.isfile(pyproject_path): |
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105 msg += ( |
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106 '\n(A "pyproject.toml" file was found, but editable ' |
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107 'mode currently requires a setup.py based build.)' |
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108 ) |
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109 raise InstallationError(msg) |
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110 |
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111 # Treating it as code that has already been checked out |
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112 url_no_extras = path_to_url(url_no_extras) |
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113 |
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114 if url_no_extras.lower().startswith('file:'): |
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115 package_name = Link(url_no_extras).egg_fragment |
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116 if extras: |
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117 return ( |
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118 package_name, |
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119 url_no_extras, |
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120 Requirement("placeholder" + extras.lower()).extras, |
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121 ) |
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122 else: |
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123 return package_name, url_no_extras, None |
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124 |
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125 for version_control in vcs: |
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126 if url.lower().startswith('%s:' % version_control): |
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127 url = '%s+%s' % (version_control, url) |
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128 break |
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129 |
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130 if '+' not in url: |
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131 raise InstallationError( |
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132 '{} is not a valid editable requirement. ' |
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133 'It should either be a path to a local project or a VCS URL ' |
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134 '(beginning with svn+, git+, hg+, or bzr+).'.format(editable_req) |
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135 ) |
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136 |
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137 vc_type = url.split('+', 1)[0].lower() |
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138 |
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139 if not vcs.get_backend(vc_type): |
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140 error_message = 'For --editable=%s only ' % editable_req + \ |
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141 ', '.join([backend.name + '+URL' for backend in vcs.backends]) + \ |
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142 ' is currently supported' |
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143 raise InstallationError(error_message) |
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144 |
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145 package_name = Link(url).egg_fragment |
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146 if not package_name: |
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147 raise InstallationError( |
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148 "Could not detect requirement name for '%s', please specify one " |
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149 "with #egg=your_package_name" % editable_req |
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150 ) |
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151 return package_name, url, None |
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152 |
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153 |
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154 def deduce_helpful_msg(req): |
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155 # type: (str) -> str |
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156 """Returns helpful msg in case requirements file does not exist, |
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157 or cannot be parsed. |
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158 |
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159 :params req: Requirements file path |
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160 """ |
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161 msg = "" |
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162 if os.path.exists(req): |
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163 msg = " It does exist." |
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164 # Try to parse and check if it is a requirements file. |
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165 try: |
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166 with open(req, 'r') as fp: |
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167 # parse first line only |
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168 next(parse_requirements(fp.read())) |
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169 msg += " The argument you provided " + \ |
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170 "(%s) appears to be a" % (req) + \ |
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171 " requirements file. If that is the" + \ |
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172 " case, use the '-r' flag to install" + \ |
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173 " the packages specified within it." |
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174 except RequirementParseError: |
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175 logger.debug("Cannot parse '%s' as requirements \ |
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176 file" % (req), exc_info=True) |
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177 else: |
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178 msg += " File '%s' does not exist." % (req) |
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179 return msg |
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180 |
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181 |
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182 class RequirementParts(object): |
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183 def __init__( |
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184 self, |
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185 requirement, # type: Optional[Requirement] |
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186 link, # type: Optional[Link] |
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187 markers, # type: Optional[Marker] |
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188 extras, # type: Set[str] |
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189 ): |
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190 self.requirement = requirement |
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191 self.link = link |
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192 self.markers = markers |
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193 self.extras = extras |
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194 |
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195 |
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196 def parse_req_from_editable(editable_req): |
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197 # type: (str) -> RequirementParts |
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198 name, url, extras_override = parse_editable(editable_req) |
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199 |
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200 if name is not None: |
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201 try: |
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202 req = Requirement(name) |
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203 except InvalidRequirement: |
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204 raise InstallationError("Invalid requirement: '%s'" % name) |
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205 else: |
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206 req = None |
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207 |
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208 link = Link(url) |
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209 |
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210 return RequirementParts(req, link, None, extras_override) |
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211 |
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212 |
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213 # ---- The actual constructors follow ---- |
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214 |
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215 |
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216 def install_req_from_editable( |
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217 editable_req, # type: str |
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218 comes_from=None, # type: Optional[str] |
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219 use_pep517=None, # type: Optional[bool] |
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220 isolated=False, # type: bool |
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221 options=None, # type: Optional[Dict[str, Any]] |
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222 wheel_cache=None, # type: Optional[WheelCache] |
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223 constraint=False # type: bool |
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224 ): |
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225 # type: (...) -> InstallRequirement |
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226 |
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227 parts = parse_req_from_editable(editable_req) |
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228 |
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229 source_dir = parts.link.file_path if parts.link.scheme == 'file' else None |
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230 |
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231 return InstallRequirement( |
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232 parts.requirement, comes_from, source_dir=source_dir, |
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233 editable=True, |
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234 link=parts.link, |
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235 constraint=constraint, |
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236 use_pep517=use_pep517, |
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237 isolated=isolated, |
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238 options=options if options else {}, |
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239 wheel_cache=wheel_cache, |
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240 extras=parts.extras, |
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241 ) |
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242 |
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243 |
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244 def _looks_like_path(name): |
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245 # type: (str) -> bool |
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246 """Checks whether the string "looks like" a path on the filesystem. |
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247 |
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248 This does not check whether the target actually exists, only judge from the |
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249 appearance. |
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250 |
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251 Returns true if any of the following conditions is true: |
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252 * a path separator is found (either os.path.sep or os.path.altsep); |
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253 * a dot is found (which represents the current directory). |
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254 """ |
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255 if os.path.sep in name: |
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256 return True |
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257 if os.path.altsep is not None and os.path.altsep in name: |
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258 return True |
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259 if name.startswith("."): |
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260 return True |
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261 return False |
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262 |
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263 |
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264 def _get_url_from_path(path, name): |
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265 # type: (str, str) -> str |
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266 """ |
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267 First, it checks whether a provided path is an installable directory |
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268 (e.g. it has a setup.py). If it is, returns the path. |
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269 |
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270 If false, check if the path is an archive file (such as a .whl). |
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271 The function checks if the path is a file. If false, if the path has |
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272 an @, it will treat it as a PEP 440 URL requirement and return the path. |
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273 """ |
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274 if _looks_like_path(name) and os.path.isdir(path): |
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275 if is_installable_dir(path): |
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276 return path_to_url(path) |
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277 raise InstallationError( |
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278 "Directory %r is not installable. Neither 'setup.py' " |
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279 "nor 'pyproject.toml' found." % name |
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280 ) |
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281 if not is_archive_file(path): |
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282 return None |
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283 if os.path.isfile(path): |
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284 return path_to_url(path) |
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285 urlreq_parts = name.split('@', 1) |
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286 if len(urlreq_parts) >= 2 and not _looks_like_path(urlreq_parts[0]): |
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287 # If the path contains '@' and the part before it does not look |
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288 # like a path, try to treat it as a PEP 440 URL req instead. |
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289 return None |
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290 logger.warning( |
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291 'Requirement %r looks like a filename, but the ' |
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292 'file does not exist', |
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293 name |
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294 ) |
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295 return path_to_url(path) |
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296 |
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297 |
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298 def parse_req_from_line(name, line_source): |
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299 # type: (str, Optional[str]) -> RequirementParts |
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300 if is_url(name): |
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301 marker_sep = '; ' |
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302 else: |
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303 marker_sep = ';' |
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304 if marker_sep in name: |
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305 name, markers_as_string = name.split(marker_sep, 1) |
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306 markers_as_string = markers_as_string.strip() |
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307 if not markers_as_string: |
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308 markers = None |
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309 else: |
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310 markers = Marker(markers_as_string) |
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311 else: |
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312 markers = None |
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313 name = name.strip() |
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314 req_as_string = None |
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315 path = os.path.normpath(os.path.abspath(name)) |
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316 link = None |
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317 extras_as_string = None |
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318 |
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319 if is_url(name): |
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320 link = Link(name) |
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321 else: |
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322 p, extras_as_string = _strip_extras(path) |
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323 url = _get_url_from_path(p, name) |
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324 if url is not None: |
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325 link = Link(url) |
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326 |
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327 # it's a local file, dir, or url |
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328 if link: |
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329 # Handle relative file URLs |
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330 if link.scheme == 'file' and re.search(r'\.\./', link.url): |
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331 link = Link( |
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332 path_to_url(os.path.normpath(os.path.abspath(link.path)))) |
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333 # wheel file |
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334 if link.is_wheel: |
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335 wheel = Wheel(link.filename) # can raise InvalidWheelFilename |
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336 req_as_string = "%s==%s" % (wheel.name, wheel.version) |
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337 else: |
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338 # set the req to the egg fragment. when it's not there, this |
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339 # will become an 'unnamed' requirement |
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340 req_as_string = link.egg_fragment |
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341 |
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342 # a requirement specifier |
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343 else: |
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344 req_as_string = name |
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345 |
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346 extras = convert_extras(extras_as_string) |
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347 |
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348 def with_source(text): |
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349 # type: (str) -> str |
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350 if not line_source: |
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351 return text |
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352 return '{} (from {})'.format(text, line_source) |
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353 |
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354 if req_as_string is not None: |
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355 try: |
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356 req = Requirement(req_as_string) |
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357 except InvalidRequirement: |
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358 if os.path.sep in req_as_string: |
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359 add_msg = "It looks like a path." |
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360 add_msg += deduce_helpful_msg(req_as_string) |
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361 elif ('=' in req_as_string and |
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362 not any(op in req_as_string for op in operators)): |
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363 add_msg = "= is not a valid operator. Did you mean == ?" |
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364 else: |
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365 add_msg = '' |
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366 msg = with_source( |
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367 'Invalid requirement: {!r}'.format(req_as_string) |
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368 ) |
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369 if add_msg: |
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370 msg += '\nHint: {}'.format(add_msg) |
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371 raise InstallationError(msg) |
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372 else: |
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373 req = None |
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374 |
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375 return RequirementParts(req, link, markers, extras) |
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376 |
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377 |
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378 def install_req_from_line( |
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379 name, # type: str |
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380 comes_from=None, # type: Optional[Union[str, InstallRequirement]] |
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381 use_pep517=None, # type: Optional[bool] |
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382 isolated=False, # type: bool |
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383 options=None, # type: Optional[Dict[str, Any]] |
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384 wheel_cache=None, # type: Optional[WheelCache] |
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385 constraint=False, # type: bool |
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386 line_source=None, # type: Optional[str] |
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387 ): |
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388 # type: (...) -> InstallRequirement |
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389 """Creates an InstallRequirement from a name, which might be a |
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390 requirement, directory containing 'setup.py', filename, or URL. |
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391 |
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392 :param line_source: An optional string describing where the line is from, |
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393 for logging purposes in case of an error. |
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394 """ |
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395 parts = parse_req_from_line(name, line_source) |
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396 |
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397 return InstallRequirement( |
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398 parts.requirement, comes_from, link=parts.link, markers=parts.markers, |
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399 use_pep517=use_pep517, isolated=isolated, |
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400 options=options if options else {}, |
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401 wheel_cache=wheel_cache, |
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402 constraint=constraint, |
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403 extras=parts.extras, |
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404 ) |
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405 |
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406 |
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407 def install_req_from_req_string( |
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408 req_string, # type: str |
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409 comes_from=None, # type: Optional[InstallRequirement] |
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410 isolated=False, # type: bool |
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411 wheel_cache=None, # type: Optional[WheelCache] |
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412 use_pep517=None # type: Optional[bool] |
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413 ): |
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414 # type: (...) -> InstallRequirement |
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415 try: |
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416 req = Requirement(req_string) |
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417 except InvalidRequirement: |
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418 raise InstallationError("Invalid requirement: '%s'" % req_string) |
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419 |
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420 domains_not_allowed = [ |
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421 PyPI.file_storage_domain, |
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422 TestPyPI.file_storage_domain, |
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423 ] |
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424 if (req.url and comes_from and comes_from.link and |
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425 comes_from.link.netloc in domains_not_allowed): |
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426 # Explicitly disallow pypi packages that depend on external urls |
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427 raise InstallationError( |
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428 "Packages installed from PyPI cannot depend on packages " |
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429 "which are not also hosted on PyPI.\n" |
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430 "%s depends on %s " % (comes_from.name, req) |
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431 ) |
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432 |
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433 return InstallRequirement( |
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434 req, comes_from, isolated=isolated, wheel_cache=wheel_cache, |
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435 use_pep517=use_pep517 |
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436 ) |