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req_command.py
"""Contains the RequirementCommand base class. This class is in a separate module so the commands that do not always need PackageFinder capability don't unnecessarily import the PackageFinder machinery and all its vendored dependencies, etc. """ import logging from functools import partial from optparse import Values from typing import Any, List, Optional, Tuple from pip._internal.cache import WheelCache from pip._internal.cli import cmdoptions from pip._internal.cli.index_command import IndexGroupCommand from pip._internal.cli.index_command import SessionCommandMixin as SessionCommandMixin from pip._internal.exceptions import CommandError, PreviousBuildDirError from pip._internal.index.collector import LinkCollector from pip._internal.index.package_finder import PackageFinder from pip._internal.models.selection_prefs import SelectionPreferences from pip._internal.models.target_python import TargetPython from pip._internal.network.session import PipSession from pip._internal.operations.build.build_tracker import BuildTracker from pip._internal.operations.prepare import RequirementPreparer from pip._internal.req.constructors import ( install_req_from_editable, install_req_from_line, install_req_from_parsed_requirement, install_req_from_req_string, ) from pip._internal.req.req_file import parse_requirements from pip._internal.req.req_install import InstallRequirement from pip._internal.resolution.base import BaseResolver from pip._internal.utils.temp_dir import ( TempDirectory, TempDirectoryTypeRegistry, tempdir_kinds, ) logger = logging.getLogger(__name__) KEEPABLE_TEMPDIR_TYPES = [ tempdir_kinds.BUILD_ENV, tempdir_kinds.EPHEM_WHEEL_CACHE, tempdir_kinds.REQ_BUILD, ] def with_cleanup(func: Any) -> Any: """Decorator for common logic related to managing temporary directories. """ def configure_tempdir_registry(registry: TempDirectoryTypeRegistry) -> None: for t in KEEPABLE_TEMPDIR_TYPES: registry.set_delete(t, False) def wrapper( self: RequirementCommand, options: Values, args: List[Any] ) -> Optional[int]: assert self.tempdir_registry is not None if options.no_clean: configure_tempdir_registry(self.tempdir_registry) try: return func(self, options, args) except PreviousBuildDirError: # This kind of conflict can occur when the user passes an explicit # build directory with a pre-existing folder. In that case we do # not want to accidentally remove it. configure_tempdir_registry(self.tempdir_registry) raise return wrapper class RequirementCommand(IndexGroupCommand): def __init__(self, *args: Any, **kw: Any) -> None: super().__init__(*args, **kw) self.cmd_opts.add_option(cmdoptions.no_clean()) @staticmethod def determine_resolver_variant(options: Values) -> str: """Determines which resolver should be used, based on the given options.""" if "legacy-resolver" in options.deprecated_features_enabled: return "legacy" return "resolvelib" @classmethod def make_requirement_preparer( cls, temp_build_dir: TempDirectory, options: Values, build_tracker: BuildTracker, session: PipSession, finder: PackageFinder, use_user_site: bool, download_dir: Optional[str] = None, verbosity: int = 0, ) -> RequirementPreparer: """ Create a RequirementPreparer instance for the given parameters. """ temp_build_dir_path = temp_build_dir.path assert temp_build_dir_path is not None legacy_resolver = False resolver_variant = cls.determine_resolver_variant(options) if resolver_variant == "resolvelib": lazy_wheel = "fast-deps" in options.features_enabled if lazy_wheel: logger.warning( "pip is using lazily downloaded wheels using HTTP " "range requests to obtain dependency information. " "This experimental feature is enabled through " "--use-feature=fast-deps and it is not ready for " "production." ) else: legacy_resolver = True lazy_wheel = False if "fast-deps" in options.features_enabled: logger.warning( "fast-deps has no effect when used with the legacy resolver." ) return RequirementPreparer( build_dir=temp_build_dir_path, src_dir=options.src_dir, download_dir=download_dir, build_isolation=options.build_isolation, check_build_deps=options.check_build_deps, build_tracker=build_tracker, session=session, progress_bar=options.progress_bar, finder=finder, require_hashes=options.require_hashes, use_user_site=use_user_site, lazy_wheel=lazy_wheel, verbosity=verbosity, legacy_resolver=legacy_resolver, ) @classmethod def make_resolver( cls, preparer: RequirementPreparer, finder: PackageFinder, options: Values, wheel_cache: Optional[WheelCache] = None, use_user_site: bool = False, ignore_installed: bool = True, ignore_requires_python: bool = False, force_reinstall: bool = False, upgrade_strategy: str = "to-satisfy-only", use_pep517: Optional[bool] = None, py_version_info: Optional[Tuple[int, ...]] = None, ) -> BaseResolver: """ Create a Resolver instance for the given parameters. """ make_install_req = partial( install_req_from_req_string, isolated=options.isolated_mode, use_pep517=use_pep517, ) resolver_variant = cls.determine_resolver_variant(options) # The long import name and duplicated invocation is needed to convince # Mypy into correctly typechecking. Otherwise it would complain the # "Resolver" class being redefined. if resolver_variant == "resolvelib": import pip._internal.resolution.resolvelib.resolver return pip._internal.resolution.resolvelib.resolver.Resolver( preparer=preparer, finder=finder, wheel_cache=wheel_cache, make_install_req=make_install_req, use_user_site=use_user_site, ignore_dependencies=options.ignore_dependencies, ignore_installed=ignore_installed, ignore_requires_python=ignore_requires_python, force_reinstall=force_reinstall, upgrade_strategy=upgrade_strategy, py_version_info=py_version_info, ) import pip._internal.resolution.legacy.resolver return pip._internal.resolution.legacy.resolver.Resolver( preparer=preparer, finder=finder, wheel_cache=wheel_cache, make_install_req=make_install_req, use_user_site=use_user_site, ignore_dependencies=options.ignore_dependencies, ignore_installed=ignore_installed, ignore_requires_python=ignore_requires_python, force_reinstall=force_reinstall, upgrade_strategy=upgrade_strategy, py_version_info=py_version_info, ) def get_requirements( self, args: List[str], options: Values, finder: PackageFinder, session: PipSession, ) -> List[InstallRequirement]: """ Parse command-line arguments into the corresponding requirements. """ requirements: List[InstallRequirement] = [] for filename in options.constraints: for parsed_req in parse_requirements( filename, constraint=True, finder=finder, options=options, session=session, ): req_to_add = install_req_from_parsed_requirement( parsed_req, isolated=options.isolated_mode, user_supplied=False, ) requirements.append(req_to_add) for req in args: req_to_add = install_req_from_line( req, comes_from=None, isolated=options.isolated_mode, use_pep517=options.use_pep517, user_supplied=True, config_settings=getattr(options, "config_settings", None), ) requirements.append(req_to_add) for req in options.editables: req_to_add = install_req_from_editable( req, user_supplied=True, isolated=options.isolated_mode, use_pep517=options.use_pep517, config_settings=getattr(options, "config_settings", None), ) requirements.append(req_to_add) # NOTE: options.require_hashes may be set if --require-hashes is True for filename in options.requirements: for parsed_req in parse_requirements( filename, finder=finder, options=options, session=session ): req_to_add = install_req_from_parsed_requirement( parsed_req, isolated=options.isolated_mode, use_pep517=options.use_pep517, user_supplied=True, config_settings=( parsed_req.options.get("config_settings") if parsed_req.options else None ), ) requirements.append(req_to_add) # If any requirement has hash options, enable hash checking. if any(req.has_hash_options for req in requirements): options.require_hashes = True if not (args or options.editables or options.requirements): opts = {"name": self.name} if options.find_links: raise CommandError( "You must give at least one requirement to {name} " '(maybe you meant "pip {name} {links}"?)'.format( **dict(opts, links=" ".join(options.find_links)) ) ) else: raise CommandError( "You must give at least one requirement to {name} " '(see "pip help {name}")'.format(**opts) ) return requirements @staticmethod def trace_basic_info(finder: PackageFinder) -> None: """ Trace basic information about the provided objects. """ # Display where finder is looking for packages search_scope = finder.search_scope locations = search_scope.get_formatted_locations() if locations: logger.info(locations) def _build_package_finder( self, options: Values, session: PipSession, target_python: Optional[TargetPython] = None, ignore_requires_python: Optional[bool] = None, ) -> PackageFinder: """ Create a package finder appropriate to this requirement command. :param ignore_requires_python: Whether to ignore incompatible "Requires-Python" values in links. Defaults to False. """ link_collector = LinkCollector.create(session, options=options) selection_prefs = SelectionPreferences( allow_yanked=True, format_control=options.format_control, allow_all_prereleases=options.pre, prefer_binary=options.prefer_binary, ignore_requires_python=ignore_requires_python, ) return PackageFinder.create( link_collector=link_collector, selection_prefs=selection_prefs, target_python=target_python, )
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