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"""Validation of dependencies of packages """ # The following comment should be removed at some point in the future. # mypy: strict-optional=False # mypy: disallow-untyped-defs=False import logging from collections import namedtuple from pip._vendor.packaging.utils import canonicalize_name from pip._vendor.pkg_resources import RequirementParseError from pip._internal.distributions import ( make_distribution_for_install_requirement, ) from pip._internal.utils.misc import get_installed_distributions from pip._internal.utils.typing import MYPY_CHECK_RUNNING logger = logging.getLogger(__name__) if MYPY_CHECK_RUNNING: from pip._internal.req.req_install import InstallRequirement from typing import ( Any, Callable, Dict, Optional, Set, Tuple, List ) # Shorthands PackageSet = Dict[str, 'PackageDetails'] Missing = Tuple[str, Any] Conflicting = Tuple[str, str, Any] MissingDict = Dict[str, List[Missing]] ConflictingDict = Dict[str, List[Conflicting]] CheckResult = Tuple[MissingDict, ConflictingDict] PackageDetails = namedtuple('PackageDetails', ['version', 'requires']) def create_package_set_from_installed(**kwargs): # type: (**Any) -> Tuple[PackageSet, bool] """Converts a list of distributions into a PackageSet. """ # Default to using all packages installed on the system if kwargs == {}: kwargs = {"local_only": False, "skip": ()} package_set = {} problems = False for dist in get_installed_distributions(**kwargs): name = canonicalize_name(dist.project_name) try: package_set[name] = PackageDetails(dist.version, dist.requires()) except RequirementParseError as e: # Don't crash on broken metadata logging.warning("Error parsing requirements for %s: %s", name, e) problems = True return package_set, problems def check_package_set(package_set, should_ignore=None): # type: (PackageSet, Optional[Callable[[str], bool]]) -> CheckResult """Check if a package set is consistent If should_ignore is passed, it should be a callable that takes a package name and returns a boolean. """ if should_ignore is None: def should_ignore(name): return False missing = {} conflicting = {} for package_name in package_set: # Info about dependencies of package_name missing_deps = set() # type: Set[Missing] conflicting_deps = set() # type: Set[Conflicting] if should_ignore(package_name): continue for req in package_set[package_name].requires: name = canonicalize_name(req.project_name) # type: str # Check if it's missing if name not in package_set: missed = True if req.marker is not None: missed = req.marker.evaluate() if missed: missing_deps.add((name, req)) continue # Check if there's a conflict version = package_set[name].version # type: str if not req.specifier.contains(version, prereleases=True): conflicting_deps.add((name, version, req)) if missing_deps: missing[package_name] = sorted(missing_deps, key=str) if conflicting_deps: conflicting[package_name] = sorted(conflicting_deps, key=str) return missing, conflicting def check_install_conflicts(to_install): # type: (List[InstallRequirement]) -> Tuple[PackageSet, CheckResult] """For checking if the dependency graph would be consistent after \ installing given requirements """ # Start from the current state package_set, _ = create_package_set_from_installed() # Install packages would_be_installed = _simulate_installation_of(to_install, package_set) # Only warn about directly-dependent packages; create a whitelist of them whitelist = _create_whitelist(would_be_installed, package_set) return ( package_set, check_package_set( package_set, should_ignore=lambda name: name not in whitelist ) ) def _simulate_installation_of(to_install, package_set): # type: (List[InstallRequirement], PackageSet) -> Set[str] """Computes the version of packages after installing to_install. """ # Keep track of packages that were installed installed = set() # Modify it as installing requirement_set would (assuming no errors) for inst_req in to_install: abstract_dist = make_distribution_for_install_requirement(inst_req) dist = abstract_dist.get_pkg_resources_distribution() name = canonicalize_name(dist.key) package_set[name] = PackageDetails(dist.version, dist.requires()) installed.add(name) return installed def _create_whitelist(would_be_installed, package_set): # type: (Set[str], PackageSet) -> Set[str] packages_affected = set(would_be_installed) for package_name in package_set: if package_name in packages_affected: continue for req in package_set[package_name].requires: if canonicalize_name(req.name) in packages_affected: packages_affected.add(package_name) break return packages_affected
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