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annotate planemo/lib/python3.7/site-packages/pip/_internal/legacy_resolve.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 """Dependency Resolution
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2
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3 The dependency resolution in pip is performed as follows:
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4
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5 for top-level requirements:
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6 a. only one spec allowed per project, regardless of conflicts or not.
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7 otherwise a "double requirement" exception is raised
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8 b. they override sub-dependency requirements.
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9 for sub-dependencies
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10 a. "first found, wins" (where the order is breadth first)
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11 """
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12
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13 import logging
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14 import sys
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15 from collections import defaultdict
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16 from itertools import chain
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17
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18 from pip._vendor.packaging import specifiers
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19
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20 from pip._internal.exceptions import (
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21 BestVersionAlreadyInstalled, DistributionNotFound, HashError, HashErrors,
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22 UnsupportedPythonVersion,
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23 )
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24 from pip._internal.req.constructors import install_req_from_req_string
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25 from pip._internal.utils.logging import indent_log
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26 from pip._internal.utils.misc import (
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27 dist_in_usersite, ensure_dir, normalize_version_info,
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28 )
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29 from pip._internal.utils.packaging import (
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30 check_requires_python, get_requires_python,
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31 )
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32 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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33
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34 if MYPY_CHECK_RUNNING:
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35 from typing import DefaultDict, List, Optional, Set, Tuple
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36 from pip._vendor import pkg_resources
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37
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38 from pip._internal.cache import WheelCache
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39 from pip._internal.distributions import AbstractDistribution
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40 from pip._internal.download import PipSession
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41 from pip._internal.index import PackageFinder
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42 from pip._internal.operations.prepare import RequirementPreparer
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43 from pip._internal.req.req_install import InstallRequirement
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44 from pip._internal.req.req_set import RequirementSet
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45
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46 logger = logging.getLogger(__name__)
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47
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48
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49 def _check_dist_requires_python(
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50 dist, # type: pkg_resources.Distribution
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51 version_info, # type: Tuple[int, int, int]
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52 ignore_requires_python=False, # type: bool
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53 ):
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54 # type: (...) -> None
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55 """
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56 Check whether the given Python version is compatible with a distribution's
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57 "Requires-Python" value.
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58
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59 :param version_info: A 3-tuple of ints representing the Python
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60 major-minor-micro version to check.
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61 :param ignore_requires_python: Whether to ignore the "Requires-Python"
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62 value if the given Python version isn't compatible.
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63
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64 :raises UnsupportedPythonVersion: When the given Python version isn't
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65 compatible.
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66 """
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67 requires_python = get_requires_python(dist)
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68 try:
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69 is_compatible = check_requires_python(
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70 requires_python, version_info=version_info,
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71 )
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72 except specifiers.InvalidSpecifier as exc:
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73 logger.warning(
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74 "Package %r has an invalid Requires-Python: %s",
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75 dist.project_name, exc,
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76 )
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77 return
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78
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79 if is_compatible:
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80 return
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81
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82 version = '.'.join(map(str, version_info))
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83 if ignore_requires_python:
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84 logger.debug(
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85 'Ignoring failed Requires-Python check for package %r: '
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86 '%s not in %r',
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87 dist.project_name, version, requires_python,
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88 )
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89 return
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90
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91 raise UnsupportedPythonVersion(
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92 'Package {!r} requires a different Python: {} not in {!r}'.format(
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93 dist.project_name, version, requires_python,
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94 ))
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95
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96
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97 class Resolver(object):
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98 """Resolves which packages need to be installed/uninstalled to perform \
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99 the requested operation without breaking the requirements of any package.
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100 """
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101
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102 _allowed_strategies = {"eager", "only-if-needed", "to-satisfy-only"}
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103
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104 def __init__(
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105 self,
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106 preparer, # type: RequirementPreparer
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107 session, # type: PipSession
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108 finder, # type: PackageFinder
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109 wheel_cache, # type: Optional[WheelCache]
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110 use_user_site, # type: bool
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111 ignore_dependencies, # type: bool
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112 ignore_installed, # type: bool
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113 ignore_requires_python, # type: bool
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114 force_reinstall, # type: bool
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115 isolated, # type: bool
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116 upgrade_strategy, # type: str
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117 use_pep517=None, # type: Optional[bool]
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118 py_version_info=None, # type: Optional[Tuple[int, ...]]
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119 ):
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120 # type: (...) -> None
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121 super(Resolver, self).__init__()
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122 assert upgrade_strategy in self._allowed_strategies
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123
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124 if py_version_info is None:
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125 py_version_info = sys.version_info[:3]
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126 else:
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127 py_version_info = normalize_version_info(py_version_info)
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128
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129 self._py_version_info = py_version_info
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130
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131 self.preparer = preparer
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132 self.finder = finder
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133 self.session = session
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134
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135 # NOTE: This would eventually be replaced with a cache that can give
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136 # information about both sdist and wheels transparently.
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137 self.wheel_cache = wheel_cache
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138
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139 # This is set in resolve
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140 self.require_hashes = None # type: Optional[bool]
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141
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142 self.upgrade_strategy = upgrade_strategy
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143 self.force_reinstall = force_reinstall
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144 self.isolated = isolated
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145 self.ignore_dependencies = ignore_dependencies
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146 self.ignore_installed = ignore_installed
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147 self.ignore_requires_python = ignore_requires_python
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148 self.use_user_site = use_user_site
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149 self.use_pep517 = use_pep517
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150
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151 self._discovered_dependencies = \
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152 defaultdict(list) # type: DefaultDict[str, List]
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153
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154 def resolve(self, requirement_set):
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155 # type: (RequirementSet) -> None
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156 """Resolve what operations need to be done
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157
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158 As a side-effect of this method, the packages (and their dependencies)
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159 are downloaded, unpacked and prepared for installation. This
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160 preparation is done by ``pip.operations.prepare``.
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161
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162 Once PyPI has static dependency metadata available, it would be
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163 possible to move the preparation to become a step separated from
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164 dependency resolution.
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165 """
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166 # make the wheelhouse
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167 if self.preparer.wheel_download_dir:
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168 ensure_dir(self.preparer.wheel_download_dir)
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169
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170 # If any top-level requirement has a hash specified, enter
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171 # hash-checking mode, which requires hashes from all.
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172 root_reqs = (
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173 requirement_set.unnamed_requirements +
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174 list(requirement_set.requirements.values())
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175 )
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176 self.require_hashes = (
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177 requirement_set.require_hashes or
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178 any(req.has_hash_options for req in root_reqs)
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179 )
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180
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181 # Display where finder is looking for packages
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182 search_scope = self.finder.search_scope
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183 locations = search_scope.get_formatted_locations()
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184 if locations:
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185 logger.info(locations)
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186
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187 # Actually prepare the files, and collect any exceptions. Most hash
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188 # exceptions cannot be checked ahead of time, because
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189 # req.populate_link() needs to be called before we can make decisions
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190 # based on link type.
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191 discovered_reqs = [] # type: List[InstallRequirement]
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192 hash_errors = HashErrors()
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193 for req in chain(root_reqs, discovered_reqs):
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194 try:
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195 discovered_reqs.extend(
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196 self._resolve_one(requirement_set, req)
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197 )
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198 except HashError as exc:
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199 exc.req = req
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200 hash_errors.append(exc)
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201
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202 if hash_errors:
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203 raise hash_errors
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204
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205 def _is_upgrade_allowed(self, req):
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206 # type: (InstallRequirement) -> bool
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207 if self.upgrade_strategy == "to-satisfy-only":
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208 return False
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209 elif self.upgrade_strategy == "eager":
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210 return True
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211 else:
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212 assert self.upgrade_strategy == "only-if-needed"
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213 return req.is_direct
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214
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215 def _set_req_to_reinstall(self, req):
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216 # type: (InstallRequirement) -> None
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217 """
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218 Set a requirement to be installed.
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219 """
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220 # Don't uninstall the conflict if doing a user install and the
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221 # conflict is not a user install.
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222 if not self.use_user_site or dist_in_usersite(req.satisfied_by):
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223 req.conflicts_with = req.satisfied_by
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224 req.satisfied_by = None
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225
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226 # XXX: Stop passing requirement_set for options
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227 def _check_skip_installed(self, req_to_install):
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228 # type: (InstallRequirement) -> Optional[str]
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229 """Check if req_to_install should be skipped.
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230
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231 This will check if the req is installed, and whether we should upgrade
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232 or reinstall it, taking into account all the relevant user options.
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233
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234 After calling this req_to_install will only have satisfied_by set to
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235 None if the req_to_install is to be upgraded/reinstalled etc. Any
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236 other value will be a dist recording the current thing installed that
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237 satisfies the requirement.
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238
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239 Note that for vcs urls and the like we can't assess skipping in this
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240 routine - we simply identify that we need to pull the thing down,
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241 then later on it is pulled down and introspected to assess upgrade/
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242 reinstalls etc.
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243
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244 :return: A text reason for why it was skipped, or None.
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245 """
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246 if self.ignore_installed:
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247 return None
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248
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249 req_to_install.check_if_exists(self.use_user_site)
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250 if not req_to_install.satisfied_by:
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251 return None
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252
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253 if self.force_reinstall:
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254 self._set_req_to_reinstall(req_to_install)
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255 return None
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256
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257 if not self._is_upgrade_allowed(req_to_install):
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258 if self.upgrade_strategy == "only-if-needed":
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259 return 'already satisfied, skipping upgrade'
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260 return 'already satisfied'
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261
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262 # Check for the possibility of an upgrade. For link-based
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263 # requirements we have to pull the tree down and inspect to assess
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264 # the version #, so it's handled way down.
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265 if not req_to_install.link:
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266 try:
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267 self.finder.find_requirement(req_to_install, upgrade=True)
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268 except BestVersionAlreadyInstalled:
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269 # Then the best version is installed.
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270 return 'already up-to-date'
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271 except DistributionNotFound:
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272 # No distribution found, so we squash the error. It will
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273 # be raised later when we re-try later to do the install.
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274 # Why don't we just raise here?
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275 pass
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276
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277 self._set_req_to_reinstall(req_to_install)
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278 return None
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279
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280 def _get_abstract_dist_for(self, req):
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281 # type: (InstallRequirement) -> AbstractDistribution
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282 """Takes a InstallRequirement and returns a single AbstractDist \
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283 representing a prepared variant of the same.
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284 """
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285 assert self.require_hashes is not None, (
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286 "require_hashes should have been set in Resolver.resolve()"
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287 )
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288
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289 if req.editable:
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290 return self.preparer.prepare_editable_requirement(
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291 req, self.require_hashes, self.use_user_site, self.finder,
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292 )
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293
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294 # satisfied_by is only evaluated by calling _check_skip_installed,
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295 # so it must be None here.
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296 assert req.satisfied_by is None
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297 skip_reason = self._check_skip_installed(req)
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298
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299 if req.satisfied_by:
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300 return self.preparer.prepare_installed_requirement(
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301 req, self.require_hashes, skip_reason
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302 )
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303
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304 upgrade_allowed = self._is_upgrade_allowed(req)
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305 abstract_dist = self.preparer.prepare_linked_requirement(
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306 req, self.session, self.finder, upgrade_allowed,
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307 self.require_hashes
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308 )
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309
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310 # NOTE
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311 # The following portion is for determining if a certain package is
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312 # going to be re-installed/upgraded or not and reporting to the user.
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313 # This should probably get cleaned up in a future refactor.
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314
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315 # req.req is only avail after unpack for URL
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316 # pkgs repeat check_if_exists to uninstall-on-upgrade
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317 # (#14)
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318 if not self.ignore_installed:
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319 req.check_if_exists(self.use_user_site)
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320
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321 if req.satisfied_by:
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322 should_modify = (
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323 self.upgrade_strategy != "to-satisfy-only" or
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324 self.force_reinstall or
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325 self.ignore_installed or
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326 req.link.scheme == 'file'
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327 )
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328 if should_modify:
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329 self._set_req_to_reinstall(req)
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330 else:
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331 logger.info(
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332 'Requirement already satisfied (use --upgrade to upgrade):'
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333 ' %s', req,
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334 )
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335
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336 return abstract_dist
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337
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338 def _resolve_one(
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339 self,
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340 requirement_set, # type: RequirementSet
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341 req_to_install # type: InstallRequirement
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342 ):
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343 # type: (...) -> List[InstallRequirement]
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344 """Prepare a single requirements file.
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345
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346 :return: A list of additional InstallRequirements to also install.
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347 """
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348 # Tell user what we are doing for this requirement:
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349 # obtain (editable), skipping, processing (local url), collecting
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350 # (remote url or package name)
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351 if req_to_install.constraint or req_to_install.prepared:
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352 return []
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353
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354 req_to_install.prepared = True
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355
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356 # register tmp src for cleanup in case something goes wrong
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357 requirement_set.reqs_to_cleanup.append(req_to_install)
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358
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359 abstract_dist = self._get_abstract_dist_for(req_to_install)
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360
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361 # Parse and return dependencies
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362 dist = abstract_dist.get_pkg_resources_distribution()
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363 # This will raise UnsupportedPythonVersion if the given Python
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364 # version isn't compatible with the distribution's Requires-Python.
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365 _check_dist_requires_python(
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366 dist, version_info=self._py_version_info,
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367 ignore_requires_python=self.ignore_requires_python,
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368 )
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369
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370 more_reqs = [] # type: List[InstallRequirement]
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371
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372 def add_req(subreq, extras_requested):
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373 sub_install_req = install_req_from_req_string(
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374 str(subreq),
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375 req_to_install,
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376 isolated=self.isolated,
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377 wheel_cache=self.wheel_cache,
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378 use_pep517=self.use_pep517
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379 )
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380 parent_req_name = req_to_install.name
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381 to_scan_again, add_to_parent = requirement_set.add_requirement(
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382 sub_install_req,
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383 parent_req_name=parent_req_name,
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384 extras_requested=extras_requested,
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385 )
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386 if parent_req_name and add_to_parent:
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387 self._discovered_dependencies[parent_req_name].append(
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388 add_to_parent
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389 )
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390 more_reqs.extend(to_scan_again)
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391
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392 with indent_log():
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393 # We add req_to_install before its dependencies, so that we
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394 # can refer to it when adding dependencies.
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395 if not requirement_set.has_requirement(req_to_install.name):
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396 # 'unnamed' requirements will get added here
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397 req_to_install.is_direct = True
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398 requirement_set.add_requirement(
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399 req_to_install, parent_req_name=None,
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400 )
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401
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402 if not self.ignore_dependencies:
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403 if req_to_install.extras:
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404 logger.debug(
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405 "Installing extra requirements: %r",
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406 ','.join(req_to_install.extras),
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407 )
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408 missing_requested = sorted(
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409 set(req_to_install.extras) - set(dist.extras)
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410 )
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411 for missing in missing_requested:
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412 logger.warning(
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413 '%s does not provide the extra \'%s\'',
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414 dist, missing
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415 )
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416
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417 available_requested = sorted(
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418 set(dist.extras) & set(req_to_install.extras)
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419 )
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420 for subreq in dist.requires(available_requested):
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421 add_req(subreq, extras_requested=available_requested)
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422
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423 if not req_to_install.editable and not req_to_install.satisfied_by:
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424 # XXX: --no-install leads this to report 'Successfully
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425 # downloaded' for only non-editable reqs, even though we took
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426 # action on them.
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427 requirement_set.successfully_downloaded.append(req_to_install)
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428
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429 return more_reqs
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430
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431 def get_installation_order(self, req_set):
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432 # type: (RequirementSet) -> List[InstallRequirement]
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433 """Create the installation order.
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434
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435 The installation order is topological - requirements are installed
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436 before the requiring thing. We break cycles at an arbitrary point,
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437 and make no other guarantees.
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438 """
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439 # The current implementation, which we may change at any point
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440 # installs the user specified things in the order given, except when
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441 # dependencies must come earlier to achieve topological order.
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442 order = []
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443 ordered_reqs = set() # type: Set[InstallRequirement]
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444
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445 def schedule(req):
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446 if req.satisfied_by or req in ordered_reqs:
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447 return
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448 if req.constraint:
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449 return
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450 ordered_reqs.add(req)
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451 for dep in self._discovered_dependencies[req.name]:
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452 schedule(dep)
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453 order.append(req)
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454
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455 for install_req in req_set.requirements.values():
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456 schedule(install_req)
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457 return order