| import contextlib |
| import functools |
| import logging |
| from typing import ( |
| TYPE_CHECKING, |
| Dict, |
| FrozenSet, |
| Iterable, |
| Iterator, |
| List, |
| Mapping, |
| NamedTuple, |
| Optional, |
| Sequence, |
| Set, |
| Tuple, |
| TypeVar, |
| cast, |
| ) |
| |
| from pip._vendor.packaging.requirements import InvalidRequirement |
| from pip._vendor.packaging.specifiers import SpecifierSet |
| from pip._vendor.packaging.utils import NormalizedName, canonicalize_name |
| from pip._vendor.resolvelib import ResolutionImpossible |
| |
| from pip._internal.cache import CacheEntry, WheelCache |
| from pip._internal.exceptions import ( |
| DistributionNotFound, |
| InstallationError, |
| InstallationSubprocessError, |
| MetadataInconsistent, |
| UnsupportedPythonVersion, |
| UnsupportedWheel, |
| ) |
| from pip._internal.index.package_finder import PackageFinder |
| from pip._internal.metadata import BaseDistribution, get_default_environment |
| from pip._internal.models.link import Link |
| from pip._internal.models.wheel import Wheel |
| from pip._internal.operations.prepare import RequirementPreparer |
| from pip._internal.req.constructors import install_req_from_link_and_ireq |
| from pip._internal.req.req_install import ( |
| InstallRequirement, |
| check_invalid_constraint_type, |
| ) |
| from pip._internal.resolution.base import InstallRequirementProvider |
| from pip._internal.utils.compatibility_tags import get_supported |
| from pip._internal.utils.hashes import Hashes |
| from pip._internal.utils.packaging import get_requirement |
| from pip._internal.utils.virtualenv import running_under_virtualenv |
| |
| from .base import Candidate, CandidateVersion, Constraint, Requirement |
| from .candidates import ( |
| AlreadyInstalledCandidate, |
| BaseCandidate, |
| EditableCandidate, |
| ExtrasCandidate, |
| LinkCandidate, |
| RequiresPythonCandidate, |
| as_base_candidate, |
| ) |
| from .found_candidates import FoundCandidates, IndexCandidateInfo |
| from .requirements import ( |
| ExplicitRequirement, |
| RequiresPythonRequirement, |
| SpecifierRequirement, |
| UnsatisfiableRequirement, |
| ) |
| |
| if TYPE_CHECKING: |
| from typing import Protocol |
| |
| class ConflictCause(Protocol): |
| requirement: RequiresPythonRequirement |
| parent: Candidate |
| |
| |
| logger = logging.getLogger(__name__) |
| |
| C = TypeVar("C") |
| Cache = Dict[Link, C] |
| |
| |
| class CollectedRootRequirements(NamedTuple): |
| requirements: List[Requirement] |
| constraints: Dict[str, Constraint] |
| user_requested: Dict[str, int] |
| |
| |
| class Factory: |
| def __init__( |
| self, |
| finder: PackageFinder, |
| preparer: RequirementPreparer, |
| make_install_req: InstallRequirementProvider, |
| wheel_cache: Optional[WheelCache], |
| use_user_site: bool, |
| force_reinstall: bool, |
| ignore_installed: bool, |
| ignore_requires_python: bool, |
| py_version_info: Optional[Tuple[int, ...]] = None, |
| ) -> None: |
| self._finder = finder |
| self.preparer = preparer |
| self._wheel_cache = wheel_cache |
| self._python_candidate = RequiresPythonCandidate(py_version_info) |
| self._make_install_req_from_spec = make_install_req |
| self._use_user_site = use_user_site |
| self._force_reinstall = force_reinstall |
| self._ignore_requires_python = ignore_requires_python |
| |
| self._build_failures: Cache[InstallationError] = {} |
| self._link_candidate_cache: Cache[LinkCandidate] = {} |
| self._editable_candidate_cache: Cache[EditableCandidate] = {} |
| self._installed_candidate_cache: Dict[str, AlreadyInstalledCandidate] = {} |
| self._extras_candidate_cache: Dict[ |
| Tuple[int, FrozenSet[str]], ExtrasCandidate |
| ] = {} |
| |
| if not ignore_installed: |
| env = get_default_environment() |
| self._installed_dists = { |
| dist.canonical_name: dist |
| for dist in env.iter_installed_distributions(local_only=False) |
| } |
| else: |
| self._installed_dists = {} |
| |
| @property |
| def force_reinstall(self) -> bool: |
| return self._force_reinstall |
| |
| def _fail_if_link_is_unsupported_wheel(self, link: Link) -> None: |
| if not link.is_wheel: |
| return |
| wheel = Wheel(link.filename) |
| if wheel.supported(self._finder.target_python.get_tags()): |
| return |
| msg = f"{link.filename} is not a supported wheel on this platform." |
| raise UnsupportedWheel(msg) |
| |
| def _make_extras_candidate( |
| self, base: BaseCandidate, extras: FrozenSet[str] |
| ) -> ExtrasCandidate: |
| cache_key = (id(base), extras) |
| try: |
| candidate = self._extras_candidate_cache[cache_key] |
| except KeyError: |
| candidate = ExtrasCandidate(base, extras) |
| self._extras_candidate_cache[cache_key] = candidate |
| return candidate |
| |
| def _make_candidate_from_dist( |
| self, |
| dist: BaseDistribution, |
| extras: FrozenSet[str], |
| template: InstallRequirement, |
| ) -> Candidate: |
| try: |
| base = self._installed_candidate_cache[dist.canonical_name] |
| except KeyError: |
| base = AlreadyInstalledCandidate(dist, template, factory=self) |
| self._installed_candidate_cache[dist.canonical_name] = base |
| if not extras: |
| return base |
| return self._make_extras_candidate(base, extras) |
| |
| def _make_candidate_from_link( |
| self, |
| link: Link, |
| extras: FrozenSet[str], |
| template: InstallRequirement, |
| name: Optional[NormalizedName], |
| version: Optional[CandidateVersion], |
| ) -> Optional[Candidate]: |
| # TODO: Check already installed candidate, and use it if the link and |
| # editable flag match. |
| |
| if link in self._build_failures: |
| # We already tried this candidate before, and it does not build. |
| # Don't bother trying again. |
| return None |
| |
| if template.editable: |
| if link not in self._editable_candidate_cache: |
| try: |
| self._editable_candidate_cache[link] = EditableCandidate( |
| link, |
| template, |
| factory=self, |
| name=name, |
| version=version, |
| ) |
| except (InstallationSubprocessError, MetadataInconsistent) as e: |
| logger.warning("Discarding %s. %s", link, e) |
| self._build_failures[link] = e |
| return None |
| base: BaseCandidate = self._editable_candidate_cache[link] |
| else: |
| if link not in self._link_candidate_cache: |
| try: |
| self._link_candidate_cache[link] = LinkCandidate( |
| link, |
| template, |
| factory=self, |
| name=name, |
| version=version, |
| ) |
| except (InstallationSubprocessError, MetadataInconsistent) as e: |
| logger.warning("Discarding %s. %s", link, e) |
| self._build_failures[link] = e |
| return None |
| base = self._link_candidate_cache[link] |
| |
| if not extras: |
| return base |
| return self._make_extras_candidate(base, extras) |
| |
| def _iter_found_candidates( |
| self, |
| ireqs: Sequence[InstallRequirement], |
| specifier: SpecifierSet, |
| hashes: Hashes, |
| prefers_installed: bool, |
| incompatible_ids: Set[int], |
| ) -> Iterable[Candidate]: |
| if not ireqs: |
| return () |
| |
| # The InstallRequirement implementation requires us to give it a |
| # "template". Here we just choose the first requirement to represent |
| # all of them. |
| # Hopefully the Project model can correct this mismatch in the future. |
| template = ireqs[0] |
| assert template.req, "Candidates found on index must be PEP 508" |
| name = canonicalize_name(template.req.name) |
| |
| extras: FrozenSet[str] = frozenset() |
| for ireq in ireqs: |
| assert ireq.req, "Candidates found on index must be PEP 508" |
| specifier &= ireq.req.specifier |
| hashes &= ireq.hashes(trust_internet=False) |
| extras |= frozenset(ireq.extras) |
| |
| def _get_installed_candidate() -> Optional[Candidate]: |
| """Get the candidate for the currently-installed version.""" |
| # If --force-reinstall is set, we want the version from the index |
| # instead, so we "pretend" there is nothing installed. |
| if self._force_reinstall: |
| return None |
| try: |
| installed_dist = self._installed_dists[name] |
| except KeyError: |
| return None |
| # Don't use the installed distribution if its version does not fit |
| # the current dependency graph. |
| if not specifier.contains(installed_dist.version, prereleases=True): |
| return None |
| candidate = self._make_candidate_from_dist( |
| dist=installed_dist, |
| extras=extras, |
| template=template, |
| ) |
| # The candidate is a known incompatiblity. Don't use it. |
| if id(candidate) in incompatible_ids: |
| return None |
| return candidate |
| |
| def iter_index_candidate_infos() -> Iterator[IndexCandidateInfo]: |
| result = self._finder.find_best_candidate( |
| project_name=name, |
| specifier=specifier, |
| hashes=hashes, |
| ) |
| icans = list(result.iter_applicable()) |
| |
| # PEP 592: Yanked releases must be ignored unless only yanked |
| # releases can satisfy the version range. So if this is false, |
| # all yanked icans need to be skipped. |
| all_yanked = all(ican.link.is_yanked for ican in icans) |
| |
| # PackageFinder returns earlier versions first, so we reverse. |
| for ican in reversed(icans): |
| if not all_yanked and ican.link.is_yanked: |
| continue |
| func = functools.partial( |
| self._make_candidate_from_link, |
| link=ican.link, |
| extras=extras, |
| template=template, |
| name=name, |
| version=ican.version, |
| ) |
| yield ican.version, func |
| |
| return FoundCandidates( |
| iter_index_candidate_infos, |
| _get_installed_candidate(), |
| prefers_installed, |
| incompatible_ids, |
| ) |
| |
| def _iter_explicit_candidates_from_base( |
| self, |
| base_requirements: Iterable[Requirement], |
| extras: FrozenSet[str], |
| ) -> Iterator[Candidate]: |
| """Produce explicit candidates from the base given an extra-ed package. |
| |
| :param base_requirements: Requirements known to the resolver. The |
| requirements are guaranteed to not have extras. |
| :param extras: The extras to inject into the explicit requirements' |
| candidates. |
| """ |
| for req in base_requirements: |
| lookup_cand, _ = req.get_candidate_lookup() |
| if lookup_cand is None: # Not explicit. |
| continue |
| # We've stripped extras from the identifier, and should always |
| # get a BaseCandidate here, unless there's a bug elsewhere. |
| base_cand = as_base_candidate(lookup_cand) |
| assert base_cand is not None, "no extras here" |
| yield self._make_extras_candidate(base_cand, extras) |
| |
| def _iter_candidates_from_constraints( |
| self, |
| identifier: str, |
| constraint: Constraint, |
| template: InstallRequirement, |
| ) -> Iterator[Candidate]: |
| """Produce explicit candidates from constraints. |
| |
| This creates "fake" InstallRequirement objects that are basically clones |
| of what "should" be the template, but with original_link set to link. |
| """ |
| for link in constraint.links: |
| self._fail_if_link_is_unsupported_wheel(link) |
| candidate = self._make_candidate_from_link( |
| link, |
| extras=frozenset(), |
| template=install_req_from_link_and_ireq(link, template), |
| name=canonicalize_name(identifier), |
| version=None, |
| ) |
| if candidate: |
| yield candidate |
| |
| def find_candidates( |
| self, |
| identifier: str, |
| requirements: Mapping[str, Iterable[Requirement]], |
| incompatibilities: Mapping[str, Iterator[Candidate]], |
| constraint: Constraint, |
| prefers_installed: bool, |
| ) -> Iterable[Candidate]: |
| # Collect basic lookup information from the requirements. |
| explicit_candidates: Set[Candidate] = set() |
| ireqs: List[InstallRequirement] = [] |
| for req in requirements[identifier]: |
| cand, ireq = req.get_candidate_lookup() |
| if cand is not None: |
| explicit_candidates.add(cand) |
| if ireq is not None: |
| ireqs.append(ireq) |
| |
| # If the current identifier contains extras, add explicit candidates |
| # from entries from extra-less identifier. |
| with contextlib.suppress(InvalidRequirement): |
| parsed_requirement = get_requirement(identifier) |
| explicit_candidates.update( |
| self._iter_explicit_candidates_from_base( |
| requirements.get(parsed_requirement.name, ()), |
| frozenset(parsed_requirement.extras), |
| ), |
| ) |
| |
| # Add explicit candidates from constraints. We only do this if there are |
| # kown ireqs, which represent requirements not already explicit. If |
| # there are no ireqs, we're constraining already-explicit requirements, |
| # which is handled later when we return the explicit candidates. |
| if ireqs: |
| try: |
| explicit_candidates.update( |
| self._iter_candidates_from_constraints( |
| identifier, |
| constraint, |
| template=ireqs[0], |
| ), |
| ) |
| except UnsupportedWheel: |
| # If we're constrained to install a wheel incompatible with the |
| # target architecture, no candidates will ever be valid. |
| return () |
| |
| # Since we cache all the candidates, incompatibility identification |
| # can be made quicker by comparing only the id() values. |
| incompat_ids = {id(c) for c in incompatibilities.get(identifier, ())} |
| |
| # If none of the requirements want an explicit candidate, we can ask |
| # the finder for candidates. |
| if not explicit_candidates: |
| return self._iter_found_candidates( |
| ireqs, |
| constraint.specifier, |
| constraint.hashes, |
| prefers_installed, |
| incompat_ids, |
| ) |
| |
| return ( |
| c |
| for c in explicit_candidates |
| if id(c) not in incompat_ids |
| and constraint.is_satisfied_by(c) |
| and all(req.is_satisfied_by(c) for req in requirements[identifier]) |
| ) |
| |
| def _make_requirement_from_install_req( |
| self, ireq: InstallRequirement, requested_extras: Iterable[str] |
| ) -> Optional[Requirement]: |
| if not ireq.match_markers(requested_extras): |
| logger.info( |
| "Ignoring %s: markers '%s' don't match your environment", |
| ireq.name, |
| ireq.markers, |
| ) |
| return None |
| if not ireq.link: |
| return SpecifierRequirement(ireq) |
| self._fail_if_link_is_unsupported_wheel(ireq.link) |
| cand = self._make_candidate_from_link( |
| ireq.link, |
| extras=frozenset(ireq.extras), |
| template=ireq, |
| name=canonicalize_name(ireq.name) if ireq.name else None, |
| version=None, |
| ) |
| if cand is None: |
| # There's no way we can satisfy a URL requirement if the underlying |
| # candidate fails to build. An unnamed URL must be user-supplied, so |
| # we fail eagerly. If the URL is named, an unsatisfiable requirement |
| # can make the resolver do the right thing, either backtrack (and |
| # maybe find some other requirement that's buildable) or raise a |
| # ResolutionImpossible eventually. |
| if not ireq.name: |
| raise self._build_failures[ireq.link] |
| return UnsatisfiableRequirement(canonicalize_name(ireq.name)) |
| return self.make_requirement_from_candidate(cand) |
| |
| def collect_root_requirements( |
| self, root_ireqs: List[InstallRequirement] |
| ) -> CollectedRootRequirements: |
| collected = CollectedRootRequirements([], {}, {}) |
| for i, ireq in enumerate(root_ireqs): |
| if ireq.constraint: |
| # Ensure we only accept valid constraints |
| problem = check_invalid_constraint_type(ireq) |
| if problem: |
| raise InstallationError(problem) |
| if not ireq.match_markers(): |
| continue |
| assert ireq.name, "Constraint must be named" |
| name = canonicalize_name(ireq.name) |
| if name in collected.constraints: |
| collected.constraints[name] &= ireq |
| else: |
| collected.constraints[name] = Constraint.from_ireq(ireq) |
| else: |
| req = self._make_requirement_from_install_req( |
| ireq, |
| requested_extras=(), |
| ) |
| if req is None: |
| continue |
| if ireq.user_supplied and req.name not in collected.user_requested: |
| collected.user_requested[req.name] = i |
| collected.requirements.append(req) |
| return collected |
| |
| def make_requirement_from_candidate( |
| self, candidate: Candidate |
| ) -> ExplicitRequirement: |
| return ExplicitRequirement(candidate) |
| |
| def make_requirement_from_spec( |
| self, |
| specifier: str, |
| comes_from: Optional[InstallRequirement], |
| requested_extras: Iterable[str] = (), |
| ) -> Optional[Requirement]: |
| ireq = self._make_install_req_from_spec(specifier, comes_from) |
| return self._make_requirement_from_install_req(ireq, requested_extras) |
| |
| def make_requires_python_requirement( |
| self, |
| specifier: SpecifierSet, |
| ) -> Optional[Requirement]: |
| if self._ignore_requires_python: |
| return None |
| # Don't bother creating a dependency for an empty Requires-Python. |
| if not str(specifier): |
| return None |
| return RequiresPythonRequirement(specifier, self._python_candidate) |
| |
| def get_wheel_cache_entry( |
| self, link: Link, name: Optional[str] |
| ) -> Optional[CacheEntry]: |
| """Look up the link in the wheel cache. |
| |
| If ``preparer.require_hashes`` is True, don't use the wheel cache, |
| because cached wheels, always built locally, have different hashes |
| than the files downloaded from the index server and thus throw false |
| hash mismatches. Furthermore, cached wheels at present have |
| nondeterministic contents due to file modification times. |
| """ |
| if self._wheel_cache is None or self.preparer.require_hashes: |
| return None |
| return self._wheel_cache.get_cache_entry( |
| link=link, |
| package_name=name, |
| supported_tags=get_supported(), |
| ) |
| |
| def get_dist_to_uninstall(self, candidate: Candidate) -> Optional[BaseDistribution]: |
| # TODO: Are there more cases this needs to return True? Editable? |
| dist = self._installed_dists.get(candidate.project_name) |
| if dist is None: # Not installed, no uninstallation required. |
| return None |
| |
| # We're installing into global site. The current installation must |
| # be uninstalled, no matter it's in global or user site, because the |
| # user site installation has precedence over global. |
| if not self._use_user_site: |
| return dist |
| |
| # We're installing into user site. Remove the user site installation. |
| if dist.in_usersite: |
| return dist |
| |
| # We're installing into user site, but the installed incompatible |
| # package is in global site. We can't uninstall that, and would let |
| # the new user installation to "shadow" it. But shadowing won't work |
| # in virtual environments, so we error out. |
| if running_under_virtualenv() and dist.in_site_packages: |
| message = ( |
| f"Will not install to the user site because it will lack " |
| f"sys.path precedence to {dist.raw_name} in {dist.location}" |
| ) |
| raise InstallationError(message) |
| return None |
| |
| def _report_requires_python_error( |
| self, causes: Sequence["ConflictCause"] |
| ) -> UnsupportedPythonVersion: |
| assert causes, "Requires-Python error reported with no cause" |
| |
| version = self._python_candidate.version |
| |
| if len(causes) == 1: |
| specifier = str(causes[0].requirement.specifier) |
| message = ( |
| f"Package {causes[0].parent.name!r} requires a different " |
| f"Python: {version} not in {specifier!r}" |
| ) |
| return UnsupportedPythonVersion(message) |
| |
| message = f"Packages require a different Python. {version} not in:" |
| for cause in causes: |
| package = cause.parent.format_for_error() |
| specifier = str(cause.requirement.specifier) |
| message += f"\n{specifier!r} (required by {package})" |
| return UnsupportedPythonVersion(message) |
| |
| def _report_single_requirement_conflict( |
| self, req: Requirement, parent: Optional[Candidate] |
| ) -> DistributionNotFound: |
| if parent is None: |
| req_disp = str(req) |
| else: |
| req_disp = f"{req} (from {parent.name})" |
| |
| cands = self._finder.find_all_candidates(req.project_name) |
| versions = [str(v) for v in sorted({c.version for c in cands})] |
| |
| logger.critical( |
| "Could not find a version that satisfies the requirement %s " |
| "(from versions: %s)", |
| req_disp, |
| ", ".join(versions) or "none", |
| ) |
| if str(req) == "requirements.txt": |
| logger.info( |
| "HINT: You are attempting to install a package literally " |
| 'named "requirements.txt" (which cannot exist). Consider ' |
| "using the '-r' flag to install the packages listed in " |
| "requirements.txt" |
| ) |
| |
| return DistributionNotFound(f"No matching distribution found for {req}") |
| |
| def get_installation_error( |
| self, |
| e: "ResolutionImpossible[Requirement, Candidate]", |
| constraints: Dict[str, Constraint], |
| ) -> InstallationError: |
| |
| assert e.causes, "Installation error reported with no cause" |
| |
| # If one of the things we can't solve is "we need Python X.Y", |
| # that is what we report. |
| requires_python_causes = [ |
| cause |
| for cause in e.causes |
| if isinstance(cause.requirement, RequiresPythonRequirement) |
| and not cause.requirement.is_satisfied_by(self._python_candidate) |
| ] |
| if requires_python_causes: |
| # The comprehension above makes sure all Requirement instances are |
| # RequiresPythonRequirement, so let's cast for convinience. |
| return self._report_requires_python_error( |
| cast("Sequence[ConflictCause]", requires_python_causes), |
| ) |
| |
| # Otherwise, we have a set of causes which can't all be satisfied |
| # at once. |
| |
| # The simplest case is when we have *one* cause that can't be |
| # satisfied. We just report that case. |
| if len(e.causes) == 1: |
| req, parent = e.causes[0] |
| if req.name not in constraints: |
| return self._report_single_requirement_conflict(req, parent) |
| |
| # OK, we now have a list of requirements that can't all be |
| # satisfied at once. |
| |
| # A couple of formatting helpers |
| def text_join(parts: List[str]) -> str: |
| if len(parts) == 1: |
| return parts[0] |
| |
| return ", ".join(parts[:-1]) + " and " + parts[-1] |
| |
| def describe_trigger(parent: Candidate) -> str: |
| ireq = parent.get_install_requirement() |
| if not ireq or not ireq.comes_from: |
| return f"{parent.name}=={parent.version}" |
| if isinstance(ireq.comes_from, InstallRequirement): |
| return str(ireq.comes_from.name) |
| return str(ireq.comes_from) |
| |
| triggers = set() |
| for req, parent in e.causes: |
| if parent is None: |
| # This is a root requirement, so we can report it directly |
| trigger = req.format_for_error() |
| else: |
| trigger = describe_trigger(parent) |
| triggers.add(trigger) |
| |
| if triggers: |
| info = text_join(sorted(triggers)) |
| else: |
| info = "the requested packages" |
| |
| msg = ( |
| "Cannot install {} because these package versions " |
| "have conflicting dependencies.".format(info) |
| ) |
| logger.critical(msg) |
| msg = "\nThe conflict is caused by:" |
| |
| relevant_constraints = set() |
| for req, parent in e.causes: |
| if req.name in constraints: |
| relevant_constraints.add(req.name) |
| msg = msg + "\n " |
| if parent: |
| msg = msg + f"{parent.name} {parent.version} depends on " |
| else: |
| msg = msg + "The user requested " |
| msg = msg + req.format_for_error() |
| for key in relevant_constraints: |
| spec = constraints[key].specifier |
| msg += f"\n The user requested (constraint) {key}{spec}" |
| |
| msg = ( |
| msg |
| + "\n\n" |
| + "To fix this you could try to:\n" |
| + "1. loosen the range of package versions you've specified\n" |
| + "2. remove package versions to allow pip attempt to solve " |
| + "the dependency conflict\n" |
| ) |
| |
| logger.info(msg) |
| |
| return DistributionNotFound( |
| "ResolutionImpossible: for help visit " |
| "https://pip.pypa.io/en/latest/user_guide/" |
| "#fixing-conflicting-dependencies" |
| ) |
