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annotate lib/python3.8/site-packages/pip/_internal/legacy_resolve.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -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 # The following comment should be removed at some point in the future.
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14 # mypy: strict-optional=False
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15 # mypy: disallow-untyped-defs=False
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16
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17 import logging
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18 import sys
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19 from collections import defaultdict
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20 from itertools import chain
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21
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22 from pip._vendor.packaging import specifiers
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23
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24 from pip._internal.exceptions import (
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25 BestVersionAlreadyInstalled,
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26 DistributionNotFound,
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27 HashError,
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28 HashErrors,
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29 UnsupportedPythonVersion,
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30 )
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31 from pip._internal.utils.logging import indent_log
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32 from pip._internal.utils.misc import dist_in_usersite, normalize_version_info
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33 from pip._internal.utils.packaging import (
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34 check_requires_python,
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35 get_requires_python,
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36 )
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37 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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38
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39 if MYPY_CHECK_RUNNING:
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40 from typing import Callable, DefaultDict, List, Optional, Set, Tuple
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41 from pip._vendor import pkg_resources
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42
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43 from pip._internal.distributions import AbstractDistribution
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44 from pip._internal.index.package_finder import PackageFinder
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45 from pip._internal.operations.prepare import RequirementPreparer
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46 from pip._internal.req.req_install import InstallRequirement
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47 from pip._internal.req.req_set import RequirementSet
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48
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49 InstallRequirementProvider = Callable[
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50 [str, InstallRequirement], InstallRequirement
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51 ]
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52 DiscoveredDependencies = DefaultDict[str, List[InstallRequirement]]
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53
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54 logger = logging.getLogger(__name__)
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55
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56
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57 def _check_dist_requires_python(
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58 dist, # type: pkg_resources.Distribution
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59 version_info, # type: Tuple[int, int, int]
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60 ignore_requires_python=False, # type: bool
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61 ):
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62 # type: (...) -> None
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63 """
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64 Check whether the given Python version is compatible with a distribution's
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65 "Requires-Python" value.
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66
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67 :param version_info: A 3-tuple of ints representing the Python
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68 major-minor-micro version to check.
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69 :param ignore_requires_python: Whether to ignore the "Requires-Python"
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70 value if the given Python version isn't compatible.
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71
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72 :raises UnsupportedPythonVersion: When the given Python version isn't
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73 compatible.
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74 """
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75 requires_python = get_requires_python(dist)
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76 try:
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77 is_compatible = check_requires_python(
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78 requires_python, version_info=version_info,
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79 )
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80 except specifiers.InvalidSpecifier as exc:
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81 logger.warning(
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82 "Package %r has an invalid Requires-Python: %s",
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83 dist.project_name, exc,
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84 )
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85 return
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86
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87 if is_compatible:
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88 return
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89
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90 version = '.'.join(map(str, version_info))
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91 if ignore_requires_python:
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92 logger.debug(
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93 'Ignoring failed Requires-Python check for package %r: '
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94 '%s not in %r',
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95 dist.project_name, version, requires_python,
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96 )
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97 return
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98
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99 raise UnsupportedPythonVersion(
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100 'Package {!r} requires a different Python: {} not in {!r}'.format(
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101 dist.project_name, version, requires_python,
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102 ))
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103
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104
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105 class Resolver(object):
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106 """Resolves which packages need to be installed/uninstalled to perform \
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107 the requested operation without breaking the requirements of any package.
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108 """
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109
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110 _allowed_strategies = {"eager", "only-if-needed", "to-satisfy-only"}
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111
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112 def __init__(
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113 self,
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114 preparer, # type: RequirementPreparer
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115 finder, # type: PackageFinder
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116 make_install_req, # type: InstallRequirementProvider
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117 use_user_site, # type: bool
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118 ignore_dependencies, # type: bool
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119 ignore_installed, # type: bool
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120 ignore_requires_python, # type: bool
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121 force_reinstall, # type: bool
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122 upgrade_strategy, # type: str
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123 py_version_info=None, # type: Optional[Tuple[int, ...]]
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124 ):
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125 # type: (...) -> None
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126 super(Resolver, self).__init__()
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127 assert upgrade_strategy in self._allowed_strategies
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guerler
parents:
diff changeset
128
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guerler
parents:
diff changeset
129 if py_version_info is None:
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guerler
parents:
diff changeset
130 py_version_info = sys.version_info[:3]
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guerler
parents:
diff changeset
131 else:
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guerler
parents:
diff changeset
132 py_version_info = normalize_version_info(py_version_info)
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guerler
parents:
diff changeset
133
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guerler
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diff changeset
134 self._py_version_info = py_version_info
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guerler
parents:
diff changeset
135
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
136 self.preparer = preparer
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
137 self.finder = finder
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guerler
parents:
diff changeset
138
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diff changeset
139 self.upgrade_strategy = upgrade_strategy
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guerler
parents:
diff changeset
140 self.force_reinstall = force_reinstall
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guerler
parents:
diff changeset
141 self.ignore_dependencies = ignore_dependencies
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guerler
parents:
diff changeset
142 self.ignore_installed = ignore_installed
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guerler
parents:
diff changeset
143 self.ignore_requires_python = ignore_requires_python
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guerler
parents:
diff changeset
144 self.use_user_site = use_user_site
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guerler
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diff changeset
145 self._make_install_req = make_install_req
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guerler
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diff changeset
146
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diff changeset
147 self._discovered_dependencies = \
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parents:
diff changeset
148 defaultdict(list) # type: DiscoveredDependencies
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149
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diff changeset
150 def resolve(self, requirement_set):
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151 # type: (RequirementSet) -> None
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152 """Resolve what operations need to be done
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153
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diff changeset
154 As a side-effect of this method, the packages (and their dependencies)
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guerler
parents:
diff changeset
155 are downloaded, unpacked and prepared for installation. This
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156 preparation is done by ``pip.operations.prepare``.
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parents:
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157
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158 Once PyPI has static dependency metadata available, it would be
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guerler
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159 possible to move the preparation to become a step separated from
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guerler
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160 dependency resolution.
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161 """
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162 # If any top-level requirement has a hash specified, enter
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163 # hash-checking mode, which requires hashes from all.
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164 root_reqs = (
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165 requirement_set.unnamed_requirements +
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166 list(requirement_set.requirements.values())
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guerler
parents:
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167 )
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guerler
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168
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guerler
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169 # Actually prepare the files, and collect any exceptions. Most hash
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170 # exceptions cannot be checked ahead of time, because
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171 # req.populate_link() needs to be called before we can make decisions
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guerler
parents:
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172 # based on link type.
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173 discovered_reqs = [] # type: List[InstallRequirement]
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guerler
parents:
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174 hash_errors = HashErrors()
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guerler
parents:
diff changeset
175 for req in chain(root_reqs, discovered_reqs):
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guerler
parents:
diff changeset
176 try:
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guerler
parents:
diff changeset
177 discovered_reqs.extend(self._resolve_one(requirement_set, req))
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guerler
parents:
diff changeset
178 except HashError as exc:
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guerler
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179 exc.req = req
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180 hash_errors.append(exc)
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guerler
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diff changeset
181
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
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diff changeset
182 if hash_errors:
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
183 raise hash_errors
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184
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185 def _is_upgrade_allowed(self, req):
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guerler
parents:
diff changeset
186 # type: (InstallRequirement) -> bool
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guerler
parents:
diff changeset
187 if self.upgrade_strategy == "to-satisfy-only":
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guerler
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188 return False
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
189 elif self.upgrade_strategy == "eager":
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parents:
diff changeset
190 return True
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
191 else:
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diff changeset
192 assert self.upgrade_strategy == "only-if-needed"
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guerler
parents:
diff changeset
193 return req.is_direct
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guerler
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diff changeset
194
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diff changeset
195 def _set_req_to_reinstall(self, req):
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diff changeset
196 # type: (InstallRequirement) -> None
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diff changeset
197 """
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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diff changeset
198 Set a requirement to be installed.
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guerler
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diff changeset
199 """
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guerler
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diff changeset
200 # Don't uninstall the conflict if doing a user install and the
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
201 # conflict is not a user install.
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
202 if not self.use_user_site or dist_in_usersite(req.satisfied_by):
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guerler
parents:
diff changeset
203 req.should_reinstall = True
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guerler
parents:
diff changeset
204 req.satisfied_by = None
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
205
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
206 def _check_skip_installed(self, req_to_install):
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
207 # type: (InstallRequirement) -> Optional[str]
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guerler
parents:
diff changeset
208 """Check if req_to_install should be skipped.
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guerler
parents:
diff changeset
209
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
210 This will check if the req is installed, and whether we should upgrade
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
211 or reinstall it, taking into account all the relevant user options.
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guerler
parents:
diff changeset
212
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
213 After calling this req_to_install will only have satisfied_by set to
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
214 None if the req_to_install is to be upgraded/reinstalled etc. Any
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
215 other value will be a dist recording the current thing installed that
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
216 satisfies the requirement.
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
217
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
218 Note that for vcs urls and the like we can't assess skipping in this
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
219 routine - we simply identify that we need to pull the thing down,
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
220 then later on it is pulled down and introspected to assess upgrade/
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
221 reinstalls etc.
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
222
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
223 :return: A text reason for why it was skipped, or None.
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
224 """
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
225 if self.ignore_installed:
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
226 return None
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
227
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
228 req_to_install.check_if_exists(self.use_user_site)
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
229 if not req_to_install.satisfied_by:
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
230 return None
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
231
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
232 if self.force_reinstall:
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
233 self._set_req_to_reinstall(req_to_install)
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
234 return None
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
235
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
236 if not self._is_upgrade_allowed(req_to_install):
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
237 if self.upgrade_strategy == "only-if-needed":
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
238 return 'already satisfied, skipping upgrade'
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
239 return 'already satisfied'
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
240
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
241 # Check for the possibility of an upgrade. For link-based
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
242 # requirements we have to pull the tree down and inspect to assess
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
243 # the version #, so it's handled way down.
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
244 if not req_to_install.link:
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
245 try:
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
246 self.finder.find_requirement(req_to_install, upgrade=True)
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
247 except BestVersionAlreadyInstalled:
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
248 # Then the best version is installed.
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
249 return 'already up-to-date'
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
250 except DistributionNotFound:
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
251 # No distribution found, so we squash the error. It will
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
252 # be raised later when we re-try later to do the install.
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
253 # Why don't we just raise here?
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
254 pass
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255
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256 self._set_req_to_reinstall(req_to_install)
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257 return None
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258
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259 def _get_abstract_dist_for(self, req):
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260 # type: (InstallRequirement) -> AbstractDistribution
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261 """Takes a InstallRequirement and returns a single AbstractDist \
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262 representing a prepared variant of the same.
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263 """
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264 if req.editable:
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265 return self.preparer.prepare_editable_requirement(req)
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266
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267 # satisfied_by is only evaluated by calling _check_skip_installed,
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268 # so it must be None here.
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269 assert req.satisfied_by is None
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270 skip_reason = self._check_skip_installed(req)
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271
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272 if req.satisfied_by:
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273 return self.preparer.prepare_installed_requirement(
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274 req, skip_reason
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275 )
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276
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277 upgrade_allowed = self._is_upgrade_allowed(req)
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278
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279 # We eagerly populate the link, since that's our "legacy" behavior.
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280 require_hashes = self.preparer.require_hashes
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281 req.populate_link(self.finder, upgrade_allowed, require_hashes)
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282 abstract_dist = self.preparer.prepare_linked_requirement(req)
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283
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284 # NOTE
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285 # The following portion is for determining if a certain package is
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286 # going to be re-installed/upgraded or not and reporting to the user.
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287 # This should probably get cleaned up in a future refactor.
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288
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289 # req.req is only avail after unpack for URL
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290 # pkgs repeat check_if_exists to uninstall-on-upgrade
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291 # (#14)
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292 if not self.ignore_installed:
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293 req.check_if_exists(self.use_user_site)
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294
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295 if req.satisfied_by:
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296 should_modify = (
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297 self.upgrade_strategy != "to-satisfy-only" or
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298 self.force_reinstall or
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299 self.ignore_installed or
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300 req.link.scheme == 'file'
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301 )
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302 if should_modify:
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303 self._set_req_to_reinstall(req)
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304 else:
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305 logger.info(
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306 'Requirement already satisfied (use --upgrade to upgrade):'
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307 ' %s', req,
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308 )
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309
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310 return abstract_dist
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311
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312 def _resolve_one(
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313 self,
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314 requirement_set, # type: RequirementSet
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315 req_to_install, # type: InstallRequirement
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316 ):
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317 # type: (...) -> List[InstallRequirement]
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318 """Prepare a single requirements file.
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319
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320 :return: A list of additional InstallRequirements to also install.
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321 """
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322 # Tell user what we are doing for this requirement:
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323 # obtain (editable), skipping, processing (local url), collecting
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324 # (remote url or package name)
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325 if req_to_install.constraint or req_to_install.prepared:
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326 return []
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327
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328 req_to_install.prepared = True
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329
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330 # register tmp src for cleanup in case something goes wrong
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331 requirement_set.reqs_to_cleanup.append(req_to_install)
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332
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333 abstract_dist = self._get_abstract_dist_for(req_to_install)
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334
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335 # Parse and return dependencies
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336 dist = abstract_dist.get_pkg_resources_distribution()
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337 # This will raise UnsupportedPythonVersion if the given Python
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338 # version isn't compatible with the distribution's Requires-Python.
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339 _check_dist_requires_python(
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340 dist, version_info=self._py_version_info,
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341 ignore_requires_python=self.ignore_requires_python,
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342 )
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343
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344 more_reqs = [] # type: List[InstallRequirement]
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345
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346 def add_req(subreq, extras_requested):
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347 sub_install_req = self._make_install_req(
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348 str(subreq),
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349 req_to_install,
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350 )
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351 parent_req_name = req_to_install.name
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352 to_scan_again, add_to_parent = requirement_set.add_requirement(
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353 sub_install_req,
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354 parent_req_name=parent_req_name,
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355 extras_requested=extras_requested,
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356 )
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357 if parent_req_name and add_to_parent:
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358 self._discovered_dependencies[parent_req_name].append(
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359 add_to_parent
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360 )
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361 more_reqs.extend(to_scan_again)
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362
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363 with indent_log():
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364 # We add req_to_install before its dependencies, so that we
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365 # can refer to it when adding dependencies.
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366 if not requirement_set.has_requirement(req_to_install.name):
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367 # 'unnamed' requirements will get added here
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368 # 'unnamed' requirements can only come from being directly
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369 # provided by the user.
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370 assert req_to_install.is_direct
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371 requirement_set.add_requirement(
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372 req_to_install, parent_req_name=None,
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373 )
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374
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375 if not self.ignore_dependencies:
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376 if req_to_install.extras:
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377 logger.debug(
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378 "Installing extra requirements: %r",
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379 ','.join(req_to_install.extras),
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380 )
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381 missing_requested = sorted(
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382 set(req_to_install.extras) - set(dist.extras)
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383 )
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384 for missing in missing_requested:
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385 logger.warning(
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386 '%s does not provide the extra \'%s\'',
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387 dist, missing
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388 )
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389
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390 available_requested = sorted(
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391 set(dist.extras) & set(req_to_install.extras)
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392 )
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393 for subreq in dist.requires(available_requested):
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394 add_req(subreq, extras_requested=available_requested)
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395
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396 if not req_to_install.editable and not req_to_install.satisfied_by:
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397 # XXX: --no-install leads this to report 'Successfully
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398 # downloaded' for only non-editable reqs, even though we took
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399 # action on them.
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400 requirement_set.successfully_downloaded.append(req_to_install)
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401
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402 return more_reqs
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403
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404 def get_installation_order(self, req_set):
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405 # type: (RequirementSet) -> List[InstallRequirement]
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406 """Create the installation order.
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407
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408 The installation order is topological - requirements are installed
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409 before the requiring thing. We break cycles at an arbitrary point,
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410 and make no other guarantees.
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411 """
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412 # The current implementation, which we may change at any point
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413 # installs the user specified things in the order given, except when
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414 # dependencies must come earlier to achieve topological order.
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415 order = []
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416 ordered_reqs = set() # type: Set[InstallRequirement]
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417
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418 def schedule(req):
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419 if req.satisfied_by or req in ordered_reqs:
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420 return
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421 if req.constraint:
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422 return
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423 ordered_reqs.add(req)
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424 for dep in self._discovered_dependencies[req.name]:
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425 schedule(dep)
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426 order.append(req)
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427
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428 for install_req in req_set.requirements.values():
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429 schedule(install_req)
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430 return order