--- a/lib/python3.8/site-packages/pip/_internal/cli/req_command.py	Mon Jul 27 03:47:31 2020 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,333 +0,0 @@
-"""Contains the Command base classes that depend on PipSession.
-
-The classes in this module are in a separate module so the commands not
-needing download / PackageFinder capability don't unnecessarily import the
-PackageFinder machinery and all its vendored dependencies, etc.
-"""
-
-import logging
-import os
-from functools import partial
-
-from pip._internal.cli.base_command import Command
-from pip._internal.cli.command_context import CommandContextMixIn
-from pip._internal.exceptions import CommandError
-from pip._internal.index.package_finder import PackageFinder
-from pip._internal.legacy_resolve import Resolver
-from pip._internal.models.selection_prefs import SelectionPreferences
-from pip._internal.network.download import Downloader
-from pip._internal.network.session import PipSession
-from pip._internal.operations.prepare import RequirementPreparer
-from pip._internal.req.constructors import (
-    install_req_from_editable,
-    install_req_from_line,
-    install_req_from_req_string,
-)
-from pip._internal.req.req_file import parse_requirements
-from pip._internal.self_outdated_check import (
-    make_link_collector,
-    pip_self_version_check,
-)
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-
-if MYPY_CHECK_RUNNING:
-    from optparse import Values
-    from typing import List, Optional, Tuple
-    from pip._internal.cache import WheelCache
-    from pip._internal.models.target_python import TargetPython
-    from pip._internal.req.req_set import RequirementSet
-    from pip._internal.req.req_tracker import RequirementTracker
-    from pip._internal.utils.temp_dir import TempDirectory
-
-logger = logging.getLogger(__name__)
-
-
-class SessionCommandMixin(CommandContextMixIn):
-
-    """
-    A class mixin for command classes needing _build_session().
-    """
-    def __init__(self):
-        # type: () -> None
-        super(SessionCommandMixin, self).__init__()
-        self._session = None  # Optional[PipSession]
-
-    @classmethod
-    def _get_index_urls(cls, options):
-        # type: (Values) -> Optional[List[str]]
-        """Return a list of index urls from user-provided options."""
-        index_urls = []
-        if not getattr(options, "no_index", False):
-            url = getattr(options, "index_url", None)
-            if url:
-                index_urls.append(url)
-        urls = getattr(options, "extra_index_urls", None)
-        if urls:
-            index_urls.extend(urls)
-        # Return None rather than an empty list
-        return index_urls or None
-
-    def get_default_session(self, options):
-        # type: (Values) -> PipSession
-        """Get a default-managed session."""
-        if self._session is None:
-            self._session = self.enter_context(self._build_session(options))
-            # there's no type annotation on requests.Session, so it's
-            # automatically ContextManager[Any] and self._session becomes Any,
-            # then https://github.com/python/mypy/issues/7696 kicks in
-            assert self._session is not None
-        return self._session
-
-    def _build_session(self, options, retries=None, timeout=None):
-        # type: (Values, Optional[int], Optional[int]) -> PipSession
-        assert not options.cache_dir or os.path.isabs(options.cache_dir)
-        session = PipSession(
-            cache=(
-                os.path.join(options.cache_dir, "http")
-                if options.cache_dir else None
-            ),
-            retries=retries if retries is not None else options.retries,
-            trusted_hosts=options.trusted_hosts,
-            index_urls=self._get_index_urls(options),
-        )
-
-        # Handle custom ca-bundles from the user
-        if options.cert:
-            session.verify = options.cert
-
-        # Handle SSL client certificate
-        if options.client_cert:
-            session.cert = options.client_cert
-
-        # Handle timeouts
-        if options.timeout or timeout:
-            session.timeout = (
-                timeout if timeout is not None else options.timeout
-            )
-
-        # Handle configured proxies
-        if options.proxy:
-            session.proxies = {
-                "http": options.proxy,
-                "https": options.proxy,
-            }
-
-        # Determine if we can prompt the user for authentication or not
-        session.auth.prompting = not options.no_input
-
-        return session
-
-
-class IndexGroupCommand(Command, SessionCommandMixin):
-
-    """
-    Abstract base class for commands with the index_group options.
-
-    This also corresponds to the commands that permit the pip version check.
-    """
-
-    def handle_pip_version_check(self, options):
-        # type: (Values) -> None
-        """
-        Do the pip version check if not disabled.
-
-        This overrides the default behavior of not doing the check.
-        """
-        # Make sure the index_group options are present.
-        assert hasattr(options, 'no_index')
-
-        if options.disable_pip_version_check or options.no_index:
-            return
-
-        # Otherwise, check if we're using the latest version of pip available.
-        session = self._build_session(
-            options,
-            retries=0,
-            timeout=min(5, options.timeout)
-        )
-        with session:
-            pip_self_version_check(session, options)
-
-
-class RequirementCommand(IndexGroupCommand):
-
-    @staticmethod
-    def make_requirement_preparer(
-        temp_build_dir,           # type: TempDirectory
-        options,                  # type: Values
-        req_tracker,              # type: RequirementTracker
-        session,                  # type: PipSession
-        finder,                   # type: PackageFinder
-        use_user_site,            # type: bool
-        download_dir=None,        # type: str
-        wheel_download_dir=None,  # type: str
-    ):
-        # type: (...) -> RequirementPreparer
-        """
-        Create a RequirementPreparer instance for the given parameters.
-        """
-        downloader = Downloader(session, progress_bar=options.progress_bar)
-
-        temp_build_dir_path = temp_build_dir.path
-        assert temp_build_dir_path is not None
-
-        return RequirementPreparer(
-            build_dir=temp_build_dir_path,
-            src_dir=options.src_dir,
-            download_dir=download_dir,
-            wheel_download_dir=wheel_download_dir,
-            build_isolation=options.build_isolation,
-            req_tracker=req_tracker,
-            downloader=downloader,
-            finder=finder,
-            require_hashes=options.require_hashes,
-            use_user_site=use_user_site,
-        )
-
-    @staticmethod
-    def make_resolver(
-        preparer,                            # type: RequirementPreparer
-        finder,                              # type: PackageFinder
-        options,                             # type: Values
-        wheel_cache=None,                    # type: Optional[WheelCache]
-        use_user_site=False,                 # type: bool
-        ignore_installed=True,               # type: bool
-        ignore_requires_python=False,        # type: bool
-        force_reinstall=False,               # type: bool
-        upgrade_strategy="to-satisfy-only",  # type: str
-        use_pep517=None,                     # type: Optional[bool]
-        py_version_info=None            # type: Optional[Tuple[int, ...]]
-    ):
-        # type: (...) -> Resolver
-        """
-        Create a Resolver instance for the given parameters.
-        """
-        make_install_req = partial(
-            install_req_from_req_string,
-            isolated=options.isolated_mode,
-            wheel_cache=wheel_cache,
-            use_pep517=use_pep517,
-        )
-        return Resolver(
-            preparer=preparer,
-            finder=finder,
-            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 populate_requirement_set(
-        self,
-        requirement_set,  # type: RequirementSet
-        args,             # type: List[str]
-        options,          # type: Values
-        finder,           # type: PackageFinder
-        session,          # type: PipSession
-        wheel_cache,      # type: Optional[WheelCache]
-    ):
-        # type: (...) -> None
-        """
-        Marshal cmd line args into a requirement set.
-        """
-        for filename in options.constraints:
-            for req_to_add in parse_requirements(
-                    filename,
-                    constraint=True, finder=finder, options=options,
-                    session=session, wheel_cache=wheel_cache):
-                req_to_add.is_direct = True
-                requirement_set.add_requirement(req_to_add)
-
-        for req in args:
-            req_to_add = install_req_from_line(
-                req, None, isolated=options.isolated_mode,
-                use_pep517=options.use_pep517,
-                wheel_cache=wheel_cache
-            )
-            req_to_add.is_direct = True
-            requirement_set.add_requirement(req_to_add)
-
-        for req in options.editables:
-            req_to_add = install_req_from_editable(
-                req,
-                isolated=options.isolated_mode,
-                use_pep517=options.use_pep517,
-                wheel_cache=wheel_cache
-            )
-            req_to_add.is_direct = True
-            requirement_set.add_requirement(req_to_add)
-
-        # NOTE: options.require_hashes may be set if --require-hashes is True
-        for filename in options.requirements:
-            for req_to_add in parse_requirements(
-                    filename,
-                    finder=finder, options=options, session=session,
-                    wheel_cache=wheel_cache,
-                    use_pep517=options.use_pep517):
-                req_to_add.is_direct = True
-                requirement_set.add_requirement(req_to_add)
-
-        # If any requirement has hash options, enable hash checking.
-        requirements = (
-            requirement_set.unnamed_requirements +
-            list(requirement_set.requirements.values())
-        )
-        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)s '
-                    '(maybe you meant "pip %(name)s %(links)s"?)' %
-                    dict(opts, links=' '.join(options.find_links)))
-            else:
-                raise CommandError(
-                    'You must give at least one requirement to %(name)s '
-                    '(see "pip help %(name)s")' % opts)
-
-    @staticmethod
-    def trace_basic_info(finder):
-        # type: (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,               # type: Values
-        session,               # type: PipSession
-        target_python=None,    # type: Optional[TargetPython]
-        ignore_requires_python=None,  # type: Optional[bool]
-    ):
-        # type: (...) -> 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 = make_link_collector(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,
-        )