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import logging import sys from pip._vendor.packaging.specifiers import InvalidSpecifier, SpecifierSet from pip._vendor.packaging.utils import canonicalize_name from pip._vendor.packaging.version import Version from pip._internal.req.constructors import ( install_req_from_editable, install_req_from_line, ) from pip._internal.req.req_install import InstallRequirement from pip._internal.utils.misc import normalize_version_info from pip._internal.utils.packaging import get_requires_python from pip._internal.utils.typing import MYPY_CHECK_RUNNING from .base import Candidate, format_name if MYPY_CHECK_RUNNING: from typing import Any, Optional, Sequence, Set, Tuple, Union from pip._vendor.packaging.version import _BaseVersion from pip._vendor.pkg_resources import Distribution from pip._internal.distributions import AbstractDistribution from pip._internal.models.link import Link from .base import Requirement from .factory import Factory BaseCandidate = Union[ "AlreadyInstalledCandidate", "EditableCandidate", "LinkCandidate", ] logger = logging.getLogger(__name__) def make_install_req_from_link(link, parent): # type: (Link, InstallRequirement) -> InstallRequirement assert not parent.editable, "parent is editable" return install_req_from_line( link.url, comes_from=parent.comes_from, use_pep517=parent.use_pep517, isolated=parent.isolated, constraint=parent.constraint, options=dict( install_options=parent.install_options, global_options=parent.global_options, hashes=parent.hash_options ), ) def make_install_req_from_editable(link, parent): # type: (Link, InstallRequirement) -> InstallRequirement assert parent.editable, "parent not editable" return install_req_from_editable( link.url, comes_from=parent.comes_from, use_pep517=parent.use_pep517, isolated=parent.isolated, constraint=parent.constraint, options=dict( install_options=parent.install_options, global_options=parent.global_options, hashes=parent.hash_options ), ) def make_install_req_from_dist(dist, parent): # type: (Distribution, InstallRequirement) -> InstallRequirement ireq = install_req_from_line( "{}=={}".format( canonicalize_name(dist.project_name), dist.parsed_version, ), comes_from=parent.comes_from, use_pep517=parent.use_pep517, isolated=parent.isolated, constraint=parent.constraint, options=dict( install_options=parent.install_options, global_options=parent.global_options, hashes=parent.hash_options ), ) ireq.satisfied_by = dist return ireq class _InstallRequirementBackedCandidate(Candidate): def __init__( self, link, # type: Link ireq, # type: InstallRequirement factory, # type: Factory name=None, # type: Optional[str] version=None, # type: Optional[_BaseVersion] ): # type: (...) -> None self.link = link self._factory = factory self._ireq = ireq self._name = name self._version = version self._dist = None # type: Optional[Distribution] def __repr__(self): # type: () -> str return "{class_name}({link!r})".format( class_name=self.__class__.__name__, link=str(self.link), ) def __eq__(self, other): # type: (Any) -> bool if isinstance(other, self.__class__): return self.link == other.link return False # Needed for Python 2, which does not implement this by default def __ne__(self, other): # type: (Any) -> bool return not self.__eq__(other) @property def name(self): # type: () -> str """The normalised name of the project the candidate refers to""" if self._name is None: self._name = canonicalize_name(self.dist.project_name) return self._name @property def version(self): # type: () -> _BaseVersion if self._version is None: self._version = self.dist.parsed_version return self._version def _prepare_abstract_distribution(self): # type: () -> AbstractDistribution raise NotImplementedError("Override in subclass") def _prepare(self): # type: () -> None if self._dist is not None: return abstract_dist = self._prepare_abstract_distribution() self._dist = abstract_dist.get_pkg_resources_distribution() assert self._dist is not None, "Distribution already installed" # TODO: Abort cleanly here, as the resolution has been # based on the wrong name/version until now, and # so is wrong. # TODO: (Longer term) Rather than abort, reject this candidate # and backtrack. This would need resolvelib support. # These should be "proper" errors, not just asserts, as they # can result from user errors like a requirement "foo @ URL" # when the project at URL has a name of "bar" in its metadata. assert ( self._name is None or self._name == canonicalize_name(self._dist.project_name) ), "Name mismatch: {!r} vs {!r}".format( self._name, canonicalize_name(self._dist.project_name), ) assert ( self._version is None or self._version == self._dist.parsed_version ), "Version mismatch: {!r} vs {!r}".format( self._version, self._dist.parsed_version, ) @property def dist(self): # type: () -> Distribution self._prepare() return self._dist def _get_requires_python_specifier(self): # type: () -> Optional[SpecifierSet] requires_python = get_requires_python(self.dist) if requires_python is None: return None try: spec = SpecifierSet(requires_python) except InvalidSpecifier as e: logger.warning( "Package %r has an invalid Requires-Python: %s", self.name, e, ) return None return spec def get_dependencies(self): # type: () -> Sequence[Requirement] deps = [ self._factory.make_requirement_from_spec(str(r), self._ireq) for r in self.dist.requires() ] python_dep = self._factory.make_requires_python_requirement( self._get_requires_python_specifier(), ) if python_dep: deps.append(python_dep) return deps def get_install_requirement(self): # type: () -> Optional[InstallRequirement] self._prepare() return self._ireq class LinkCandidate(_InstallRequirementBackedCandidate): def __init__( self, link, # type: Link parent, # type: InstallRequirement factory, # type: Factory name=None, # type: Optional[str] version=None, # type: Optional[_BaseVersion] ): # type: (...) -> None super(LinkCandidate, self).__init__( link=link, ireq=make_install_req_from_link(link, parent), factory=factory, name=name, version=version, ) def _prepare_abstract_distribution(self): # type: () -> AbstractDistribution return self._factory.preparer.prepare_linked_requirement(self._ireq) class EditableCandidate(_InstallRequirementBackedCandidate): def __init__( self, link, # type: Link parent, # type: InstallRequirement factory, # type: Factory name=None, # type: Optional[str] version=None, # type: Optional[_BaseVersion] ): # type: (...) -> None super(EditableCandidate, self).__init__( link=link, ireq=make_install_req_from_editable(link, parent), factory=factory, name=name, version=version, ) def _prepare_abstract_distribution(self): # type: () -> AbstractDistribution return self._factory.preparer.prepare_editable_requirement(self._ireq) class AlreadyInstalledCandidate(Candidate): def __init__( self, dist, # type: Distribution parent, # type: InstallRequirement factory, # type: Factory ): # type: (...) -> None self.dist = dist self._ireq = make_install_req_from_dist(dist, parent) self._factory = factory # This is just logging some messages, so we can do it eagerly. # The returned dist would be exactly the same as self.dist because we # set satisfied_by in make_install_req_from_dist. # TODO: Supply reason based on force_reinstall and upgrade_strategy. skip_reason = "already satisfied" factory.preparer.prepare_installed_requirement(self._ireq, skip_reason) def __repr__(self): # type: () -> str return "{class_name}({distribution!r})".format( class_name=self.__class__.__name__, distribution=self.dist, ) def __eq__(self, other): # type: (Any) -> bool if isinstance(other, self.__class__): return self.name == other.name and self.version == other.version return False # Needed for Python 2, which does not implement this by default def __ne__(self, other): # type: (Any) -> bool return not self.__eq__(other) @property def name(self): # type: () -> str return canonicalize_name(self.dist.project_name) @property def version(self): # type: () -> _BaseVersion return self.dist.parsed_version def get_dependencies(self): # type: () -> Sequence[Requirement] return [ self._factory.make_requirement_from_spec(str(r), self._ireq) for r in self.dist.requires() ] def get_install_requirement(self): # type: () -> Optional[InstallRequirement] return None class ExtrasCandidate(Candidate): """A candidate that has 'extras', indicating additional dependencies. Requirements can be for a project with dependencies, something like foo[extra]. The extras don't affect the project/version being installed directly, but indicate that we need additional dependencies. We model that by having an artificial ExtrasCandidate that wraps the "base" candidate. The ExtrasCandidate differs from the base in the following ways: 1. It has a unique name, of the form foo[extra]. This causes the resolver to treat it as a separate node in the dependency graph. 2. When we're getting the candidate's dependencies, a) We specify that we want the extra dependencies as well. b) We add a dependency on the base candidate (matching the name and version). See below for why this is needed. 3. We return None for the underlying InstallRequirement, as the base candidate will provide it, and we don't want to end up with duplicates. The dependency on the base candidate is needed so that the resolver can't decide that it should recommend foo[extra1] version 1.0 and foo[extra2] version 2.0. Having those candidates depend on foo=1.0 and foo=2.0 respectively forces the resolver to recognise that this is a conflict. """ def __init__( self, base, # type: BaseCandidate extras, # type: Set[str] ): # type: (...) -> None self.base = base self.extras = extras def __repr__(self): # type: () -> str return "{class_name}(base={base!r}, extras={extras!r})".format( class_name=self.__class__.__name__, base=self.base, extras=self.extras, ) def __eq__(self, other): # type: (Any) -> bool if isinstance(other, self.__class__): return self.base == other.base and self.extras == other.extras return False # Needed for Python 2, which does not implement this by default def __ne__(self, other): # type: (Any) -> bool return not self.__eq__(other) @property def name(self): # type: () -> str """The normalised name of the project the candidate refers to""" return format_name(self.base.name, self.extras) @property def version(self): # type: () -> _BaseVersion return self.base.version def get_dependencies(self): # type: () -> Sequence[Requirement] factory = self.base._factory # The user may have specified extras that the candidate doesn't # support. We ignore any unsupported extras here. valid_extras = self.extras.intersection(self.base.dist.extras) invalid_extras = self.extras.difference(self.base.dist.extras) if invalid_extras: logger.warning( "Invalid extras specified in %s: %s", self.name, ','.join(sorted(invalid_extras)) ) deps = [ factory.make_requirement_from_spec(str(r), self.base._ireq) for r in self.base.dist.requires(valid_extras) ] # Add a dependency on the exact base. # (See note 2b in the class docstring) spec = "{}=={}".format(self.base.name, self.base.version) deps.append(factory.make_requirement_from_spec(spec, self.base._ireq)) return deps def get_install_requirement(self): # type: () -> Optional[InstallRequirement] # We don't return anything here, because we always # depend on the base candidate, and we'll get the # install requirement from that. return None class RequiresPythonCandidate(Candidate): def __init__(self, py_version_info): # type: (Optional[Tuple[int, ...]]) -> None if py_version_info is not None: version_info = normalize_version_info(py_version_info) else: version_info = sys.version_info[:3] self._version = Version(".".join(str(c) for c in version_info)) # We don't need to implement __eq__() and __ne__() since there is always # only one RequiresPythonCandidate in a resolution, i.e. the host Python. # The built-in object.__eq__() and object.__ne__() do exactly what we want. @property def name(self): # type: () -> str # Avoid conflicting with the PyPI package "Python". return "<Python fom Requires-Python>" @property def version(self): # type: () -> _BaseVersion return self._version def get_dependencies(self): # type: () -> Sequence[Requirement] return [] def get_install_requirement(self): # type: () -> Optional[InstallRequirement] return None