--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/python3.8/site-packages/pip/_internal/commands/install.py	Mon Jul 27 03:47:31 2020 -0400
@@ -0,0 +1,701 @@
+# The following comment should be removed at some point in the future.
+# It's included for now because without it InstallCommand.run() has a
+# couple errors where we have to know req.name is str rather than
+# Optional[str] for the InstallRequirement req.
+# mypy: strict-optional=False
+# mypy: disallow-untyped-defs=False
+
+from __future__ import absolute_import
+
+import errno
+import logging
+import operator
+import os
+import shutil
+import site
+from optparse import SUPPRESS_HELP
+
+from pip._vendor import pkg_resources
+from pip._vendor.packaging.utils import canonicalize_name
+
+from pip._internal.cache import WheelCache
+from pip._internal.cli import cmdoptions
+from pip._internal.cli.cmdoptions import make_target_python
+from pip._internal.cli.req_command import RequirementCommand
+from pip._internal.cli.status_codes import ERROR, SUCCESS
+from pip._internal.exceptions import (
+    CommandError,
+    InstallationError,
+    PreviousBuildDirError,
+)
+from pip._internal.locations import distutils_scheme
+from pip._internal.operations.check import check_install_conflicts
+from pip._internal.req import RequirementSet, install_given_reqs
+from pip._internal.req.req_tracker import get_requirement_tracker
+from pip._internal.utils.deprecation import deprecated
+from pip._internal.utils.distutils_args import parse_distutils_args
+from pip._internal.utils.filesystem import test_writable_dir
+from pip._internal.utils.misc import (
+    ensure_dir,
+    get_installed_version,
+    protect_pip_from_modification_on_windows,
+    write_output,
+)
+from pip._internal.utils.temp_dir import TempDirectory
+from pip._internal.utils.typing import MYPY_CHECK_RUNNING
+from pip._internal.utils.virtualenv import virtualenv_no_global
+from pip._internal.wheel_builder import build, should_build_for_install_command
+
+if MYPY_CHECK_RUNNING:
+    from optparse import Values
+    from typing import Any, Iterable, List, Optional
+
+    from pip._internal.models.format_control import FormatControl
+    from pip._internal.req.req_install import InstallRequirement
+    from pip._internal.wheel_builder import BinaryAllowedPredicate
+
+
+logger = logging.getLogger(__name__)
+
+
+def get_check_binary_allowed(format_control):
+    # type: (FormatControl) -> BinaryAllowedPredicate
+    def check_binary_allowed(req):
+        # type: (InstallRequirement) -> bool
+        if req.use_pep517:
+            return True
+        canonical_name = canonicalize_name(req.name)
+        allowed_formats = format_control.get_allowed_formats(canonical_name)
+        return "binary" in allowed_formats
+
+    return check_binary_allowed
+
+
+class InstallCommand(RequirementCommand):
+    """
+    Install packages from:
+
+    - PyPI (and other indexes) using requirement specifiers.
+    - VCS project urls.
+    - Local project directories.
+    - Local or remote source archives.
+
+    pip also supports installing from "requirements files", which provide
+    an easy way to specify a whole environment to be installed.
+    """
+
+    usage = """
+      %prog [options] <requirement specifier> [package-index-options] ...
+      %prog [options] -r <requirements file> [package-index-options] ...
+      %prog [options] [-e] <vcs project url> ...
+      %prog [options] [-e] <local project path> ...
+      %prog [options] <archive url/path> ..."""
+
+    def __init__(self, *args, **kw):
+        super(InstallCommand, self).__init__(*args, **kw)
+
+        cmd_opts = self.cmd_opts
+
+        cmd_opts.add_option(cmdoptions.requirements())
+        cmd_opts.add_option(cmdoptions.constraints())
+        cmd_opts.add_option(cmdoptions.no_deps())
+        cmd_opts.add_option(cmdoptions.pre())
+
+        cmd_opts.add_option(cmdoptions.editable())
+        cmd_opts.add_option(
+            '-t', '--target',
+            dest='target_dir',
+            metavar='dir',
+            default=None,
+            help='Install packages into <dir>. '
+                 'By default this will not replace existing files/folders in '
+                 '<dir>. Use --upgrade to replace existing packages in <dir> '
+                 'with new versions.'
+        )
+        cmdoptions.add_target_python_options(cmd_opts)
+
+        cmd_opts.add_option(
+            '--user',
+            dest='use_user_site',
+            action='store_true',
+            help="Install to the Python user install directory for your "
+                 "platform. Typically ~/.local/, or %APPDATA%\\Python on "
+                 "Windows. (See the Python documentation for site.USER_BASE "
+                 "for full details.)")
+        cmd_opts.add_option(
+            '--no-user',
+            dest='use_user_site',
+            action='store_false',
+            help=SUPPRESS_HELP)
+        cmd_opts.add_option(
+            '--root',
+            dest='root_path',
+            metavar='dir',
+            default=None,
+            help="Install everything relative to this alternate root "
+                 "directory.")
+        cmd_opts.add_option(
+            '--prefix',
+            dest='prefix_path',
+            metavar='dir',
+            default=None,
+            help="Installation prefix where lib, bin and other top-level "
+                 "folders are placed")
+
+        cmd_opts.add_option(cmdoptions.build_dir())
+
+        cmd_opts.add_option(cmdoptions.src())
+
+        cmd_opts.add_option(
+            '-U', '--upgrade',
+            dest='upgrade',
+            action='store_true',
+            help='Upgrade all specified packages to the newest available '
+                 'version. The handling of dependencies depends on the '
+                 'upgrade-strategy used.'
+        )
+
+        cmd_opts.add_option(
+            '--upgrade-strategy',
+            dest='upgrade_strategy',
+            default='only-if-needed',
+            choices=['only-if-needed', 'eager'],
+            help='Determines how dependency upgrading should be handled '
+                 '[default: %default]. '
+                 '"eager" - dependencies are upgraded regardless of '
+                 'whether the currently installed version satisfies the '
+                 'requirements of the upgraded package(s). '
+                 '"only-if-needed" -  are upgraded only when they do not '
+                 'satisfy the requirements of the upgraded package(s).'
+        )
+
+        cmd_opts.add_option(
+            '--force-reinstall',
+            dest='force_reinstall',
+            action='store_true',
+            help='Reinstall all packages even if they are already '
+                 'up-to-date.')
+
+        cmd_opts.add_option(
+            '-I', '--ignore-installed',
+            dest='ignore_installed',
+            action='store_true',
+            help='Ignore the installed packages, overwriting them. '
+                 'This can break your system if the existing package '
+                 'is of a different version or was installed '
+                 'with a different package manager!'
+        )
+
+        cmd_opts.add_option(cmdoptions.ignore_requires_python())
+        cmd_opts.add_option(cmdoptions.no_build_isolation())
+        cmd_opts.add_option(cmdoptions.use_pep517())
+        cmd_opts.add_option(cmdoptions.no_use_pep517())
+
+        cmd_opts.add_option(cmdoptions.install_options())
+        cmd_opts.add_option(cmdoptions.global_options())
+
+        cmd_opts.add_option(
+            "--compile",
+            action="store_true",
+            dest="compile",
+            default=True,
+            help="Compile Python source files to bytecode",
+        )
+
+        cmd_opts.add_option(
+            "--no-compile",
+            action="store_false",
+            dest="compile",
+            help="Do not compile Python source files to bytecode",
+        )
+
+        cmd_opts.add_option(
+            "--no-warn-script-location",
+            action="store_false",
+            dest="warn_script_location",
+            default=True,
+            help="Do not warn when installing scripts outside PATH",
+        )
+        cmd_opts.add_option(
+            "--no-warn-conflicts",
+            action="store_false",
+            dest="warn_about_conflicts",
+            default=True,
+            help="Do not warn about broken dependencies",
+        )
+
+        cmd_opts.add_option(cmdoptions.no_binary())
+        cmd_opts.add_option(cmdoptions.only_binary())
+        cmd_opts.add_option(cmdoptions.prefer_binary())
+        cmd_opts.add_option(cmdoptions.no_clean())
+        cmd_opts.add_option(cmdoptions.require_hashes())
+        cmd_opts.add_option(cmdoptions.progress_bar())
+
+        index_opts = cmdoptions.make_option_group(
+            cmdoptions.index_group,
+            self.parser,
+        )
+
+        self.parser.insert_option_group(0, index_opts)
+        self.parser.insert_option_group(0, cmd_opts)
+
+    def run(self, options, args):
+        # type: (Values, List[Any]) -> int
+        cmdoptions.check_install_build_global(options)
+        upgrade_strategy = "to-satisfy-only"
+        if options.upgrade:
+            upgrade_strategy = options.upgrade_strategy
+
+        cmdoptions.check_dist_restriction(options, check_target=True)
+
+        install_options = options.install_options or []
+
+        options.use_user_site = decide_user_install(
+            options.use_user_site,
+            prefix_path=options.prefix_path,
+            target_dir=options.target_dir,
+            root_path=options.root_path,
+            isolated_mode=options.isolated_mode,
+        )
+
+        target_temp_dir = None  # type: Optional[TempDirectory]
+        target_temp_dir_path = None  # type: Optional[str]
+        if options.target_dir:
+            options.ignore_installed = True
+            options.target_dir = os.path.abspath(options.target_dir)
+            if (os.path.exists(options.target_dir) and not
+                    os.path.isdir(options.target_dir)):
+                raise CommandError(
+                    "Target path exists but is not a directory, will not "
+                    "continue."
+                )
+
+            # Create a target directory for using with the target option
+            target_temp_dir = TempDirectory(kind="target")
+            target_temp_dir_path = target_temp_dir.path
+
+        global_options = options.global_options or []
+
+        session = self.get_default_session(options)
+
+        target_python = make_target_python(options)
+        finder = self._build_package_finder(
+            options=options,
+            session=session,
+            target_python=target_python,
+            ignore_requires_python=options.ignore_requires_python,
+        )
+        build_delete = (not (options.no_clean or options.build_dir))
+        wheel_cache = WheelCache(options.cache_dir, options.format_control)
+
+        with get_requirement_tracker() as req_tracker, TempDirectory(
+            options.build_dir, delete=build_delete, kind="install"
+        ) as directory:
+            requirement_set = RequirementSet(
+                check_supported_wheels=not options.target_dir,
+            )
+
+            try:
+                self.populate_requirement_set(
+                    requirement_set, args, options, finder, session,
+                    wheel_cache
+                )
+
+                warn_deprecated_install_options(
+                    requirement_set, options.install_options
+                )
+
+                preparer = self.make_requirement_preparer(
+                    temp_build_dir=directory,
+                    options=options,
+                    req_tracker=req_tracker,
+                    session=session,
+                    finder=finder,
+                    use_user_site=options.use_user_site,
+                )
+                resolver = self.make_resolver(
+                    preparer=preparer,
+                    finder=finder,
+                    options=options,
+                    wheel_cache=wheel_cache,
+                    use_user_site=options.use_user_site,
+                    ignore_installed=options.ignore_installed,
+                    ignore_requires_python=options.ignore_requires_python,
+                    force_reinstall=options.force_reinstall,
+                    upgrade_strategy=upgrade_strategy,
+                    use_pep517=options.use_pep517,
+                )
+
+                self.trace_basic_info(finder)
+
+                resolver.resolve(requirement_set)
+
+                try:
+                    pip_req = requirement_set.get_requirement("pip")
+                except KeyError:
+                    modifying_pip = None
+                else:
+                    # If we're not replacing an already installed pip,
+                    # we're not modifying it.
+                    modifying_pip = pip_req.satisfied_by is None
+                protect_pip_from_modification_on_windows(
+                    modifying_pip=modifying_pip
+                )
+
+                check_binary_allowed = get_check_binary_allowed(
+                    finder.format_control
+                )
+
+                reqs_to_build = [
+                    r for r in requirement_set.requirements.values()
+                    if should_build_for_install_command(
+                        r, check_binary_allowed
+                    )
+                ]
+
+                _, build_failures = build(
+                    reqs_to_build,
+                    wheel_cache=wheel_cache,
+                    build_options=[],
+                    global_options=[],
+                )
+
+                # If we're using PEP 517, we cannot do a direct install
+                # so we fail here.
+                # We don't care about failures building legacy
+                # requirements, as we'll fall through to a direct
+                # install for those.
+                pep517_build_failures = [
+                    r for r in build_failures if r.use_pep517
+                ]
+                if pep517_build_failures:
+                    raise InstallationError(
+                        "Could not build wheels for {} which use"
+                        " PEP 517 and cannot be installed directly".format(
+                            ", ".join(r.name for r in pep517_build_failures)))
+
+                to_install = resolver.get_installation_order(
+                    requirement_set
+                )
+
+                # Consistency Checking of the package set we're installing.
+                should_warn_about_conflicts = (
+                    not options.ignore_dependencies and
+                    options.warn_about_conflicts
+                )
+                if should_warn_about_conflicts:
+                    self._warn_about_conflicts(to_install)
+
+                # Don't warn about script install locations if
+                # --target has been specified
+                warn_script_location = options.warn_script_location
+                if options.target_dir:
+                    warn_script_location = False
+
+                installed = install_given_reqs(
+                    to_install,
+                    install_options,
+                    global_options,
+                    root=options.root_path,
+                    home=target_temp_dir_path,
+                    prefix=options.prefix_path,
+                    pycompile=options.compile,
+                    warn_script_location=warn_script_location,
+                    use_user_site=options.use_user_site,
+                )
+
+                lib_locations = get_lib_location_guesses(
+                    user=options.use_user_site,
+                    home=target_temp_dir_path,
+                    root=options.root_path,
+                    prefix=options.prefix_path,
+                    isolated=options.isolated_mode,
+                )
+                working_set = pkg_resources.WorkingSet(lib_locations)
+
+                installed.sort(key=operator.attrgetter('name'))
+                items = []
+                for result in installed:
+                    item = result.name
+                    try:
+                        installed_version = get_installed_version(
+                            result.name, working_set=working_set
+                        )
+                        if installed_version:
+                            item += '-' + installed_version
+                    except Exception:
+                        pass
+                    items.append(item)
+                installed_desc = ' '.join(items)
+                if installed_desc:
+                    write_output(
+                        'Successfully installed %s', installed_desc,
+                    )
+            except EnvironmentError as error:
+                show_traceback = (self.verbosity >= 1)
+
+                message = create_env_error_message(
+                    error, show_traceback, options.use_user_site,
+                )
+                logger.error(message, exc_info=show_traceback)
+
+                return ERROR
+            except PreviousBuildDirError:
+                options.no_clean = True
+                raise
+            finally:
+                # Clean up
+                if not options.no_clean:
+                    requirement_set.cleanup_files()
+                    wheel_cache.cleanup()
+
+        if options.target_dir:
+            self._handle_target_dir(
+                options.target_dir, target_temp_dir, options.upgrade
+            )
+
+        return SUCCESS
+
+    def _handle_target_dir(self, target_dir, target_temp_dir, upgrade):
+        ensure_dir(target_dir)
+
+        # Checking both purelib and platlib directories for installed
+        # packages to be moved to target directory
+        lib_dir_list = []
+
+        with target_temp_dir:
+            # Checking both purelib and platlib directories for installed
+            # packages to be moved to target directory
+            scheme = distutils_scheme('', home=target_temp_dir.path)
+            purelib_dir = scheme['purelib']
+            platlib_dir = scheme['platlib']
+            data_dir = scheme['data']
+
+            if os.path.exists(purelib_dir):
+                lib_dir_list.append(purelib_dir)
+            if os.path.exists(platlib_dir) and platlib_dir != purelib_dir:
+                lib_dir_list.append(platlib_dir)
+            if os.path.exists(data_dir):
+                lib_dir_list.append(data_dir)
+
+            for lib_dir in lib_dir_list:
+                for item in os.listdir(lib_dir):
+                    if lib_dir == data_dir:
+                        ddir = os.path.join(data_dir, item)
+                        if any(s.startswith(ddir) for s in lib_dir_list[:-1]):
+                            continue
+                    target_item_dir = os.path.join(target_dir, item)
+                    if os.path.exists(target_item_dir):
+                        if not upgrade:
+                            logger.warning(
+                                'Target directory %s already exists. Specify '
+                                '--upgrade to force replacement.',
+                                target_item_dir
+                            )
+                            continue
+                        if os.path.islink(target_item_dir):
+                            logger.warning(
+                                'Target directory %s already exists and is '
+                                'a link. Pip will not automatically replace '
+                                'links, please remove if replacement is '
+                                'desired.',
+                                target_item_dir
+                            )
+                            continue
+                        if os.path.isdir(target_item_dir):
+                            shutil.rmtree(target_item_dir)
+                        else:
+                            os.remove(target_item_dir)
+
+                    shutil.move(
+                        os.path.join(lib_dir, item),
+                        target_item_dir
+                    )
+
+    def _warn_about_conflicts(self, to_install):
+        try:
+            package_set, _dep_info = check_install_conflicts(to_install)
+        except Exception:
+            logger.error("Error checking for conflicts.", exc_info=True)
+            return
+        missing, conflicting = _dep_info
+
+        # NOTE: There is some duplication here from pip check
+        for project_name in missing:
+            version = package_set[project_name][0]
+            for dependency in missing[project_name]:
+                logger.critical(
+                    "%s %s requires %s, which is not installed.",
+                    project_name, version, dependency[1],
+                )
+
+        for project_name in conflicting:
+            version = package_set[project_name][0]
+            for dep_name, dep_version, req in conflicting[project_name]:
+                logger.critical(
+                    "%s %s has requirement %s, but you'll have %s %s which is "
+                    "incompatible.",
+                    project_name, version, req, dep_name, dep_version,
+                )
+
+
+def get_lib_location_guesses(*args, **kwargs):
+    scheme = distutils_scheme('', *args, **kwargs)
+    return [scheme['purelib'], scheme['platlib']]
+
+
+def site_packages_writable(**kwargs):
+    return all(
+        test_writable_dir(d) for d in set(get_lib_location_guesses(**kwargs))
+    )
+
+
+def decide_user_install(
+    use_user_site,  # type: Optional[bool]
+    prefix_path=None,  # type: Optional[str]
+    target_dir=None,  # type: Optional[str]
+    root_path=None,  # type: Optional[str]
+    isolated_mode=False,  # type: bool
+):
+    # type: (...) -> bool
+    """Determine whether to do a user install based on the input options.
+
+    If use_user_site is False, no additional checks are done.
+    If use_user_site is True, it is checked for compatibility with other
+    options.
+    If use_user_site is None, the default behaviour depends on the environment,
+    which is provided by the other arguments.
+    """
+    # In some cases (config from tox), use_user_site can be set to an integer
+    # rather than a bool, which 'use_user_site is False' wouldn't catch.
+    if (use_user_site is not None) and (not use_user_site):
+        logger.debug("Non-user install by explicit request")
+        return False
+
+    if use_user_site:
+        if prefix_path:
+            raise CommandError(
+                "Can not combine '--user' and '--prefix' as they imply "
+                "different installation locations"
+            )
+        if virtualenv_no_global():
+            raise InstallationError(
+                "Can not perform a '--user' install. User site-packages "
+                "are not visible in this virtualenv."
+            )
+        logger.debug("User install by explicit request")
+        return True
+
+    # If we are here, user installs have not been explicitly requested/avoided
+    assert use_user_site is None
+
+    # user install incompatible with --prefix/--target
+    if prefix_path or target_dir:
+        logger.debug("Non-user install due to --prefix or --target option")
+        return False
+
+    # If user installs are not enabled, choose a non-user install
+    if not site.ENABLE_USER_SITE:
+        logger.debug("Non-user install because user site-packages disabled")
+        return False
+
+    # If we have permission for a non-user install, do that,
+    # otherwise do a user install.
+    if site_packages_writable(root=root_path, isolated=isolated_mode):
+        logger.debug("Non-user install because site-packages writeable")
+        return False
+
+    logger.info("Defaulting to user installation because normal site-packages "
+                "is not writeable")
+    return True
+
+
+def warn_deprecated_install_options(requirement_set, options):
+    # type: (RequirementSet, Optional[List[str]]) -> None
+    """If any location-changing --install-option arguments were passed for
+    requirements or on the command-line, then show a deprecation warning.
+    """
+    def format_options(option_names):
+        # type: (Iterable[str]) -> List[str]
+        return ["--{}".format(name.replace("_", "-")) for name in option_names]
+
+    requirements = (
+        requirement_set.unnamed_requirements +
+        list(requirement_set.requirements.values())
+    )
+
+    offenders = []
+
+    for requirement in requirements:
+        install_options = requirement.options.get("install_options", [])
+        location_options = parse_distutils_args(install_options)
+        if location_options:
+            offenders.append(
+                "{!r} from {}".format(
+                    format_options(location_options.keys()), requirement
+                )
+            )
+
+    if options:
+        location_options = parse_distutils_args(options)
+        if location_options:
+            offenders.append(
+                "{!r} from command line".format(
+                    format_options(location_options.keys())
+                )
+            )
+
+    if not offenders:
+        return
+
+    deprecated(
+        reason=(
+            "Location-changing options found in --install-option: {}. "
+            "This configuration may cause unexpected behavior and is "
+            "unsupported.".format(
+                "; ".join(offenders)
+            )
+        ),
+        replacement=(
+            "using pip-level options like --user, --prefix, --root, and "
+            "--target"
+        ),
+        gone_in="20.2",
+        issue=7309,
+    )
+
+
+def create_env_error_message(error, show_traceback, using_user_site):
+    """Format an error message for an EnvironmentError
+
+    It may occur anytime during the execution of the install command.
+    """
+    parts = []
+
+    # Mention the error if we are not going to show a traceback
+    parts.append("Could not install packages due to an EnvironmentError")
+    if not show_traceback:
+        parts.append(": ")
+        parts.append(str(error))
+    else:
+        parts.append(".")
+
+    # Spilt the error indication from a helper message (if any)
+    parts[-1] += "\n"
+
+    # Suggest useful actions to the user:
+    #  (1) using user site-packages or (2) verifying the permissions
+    if error.errno == errno.EACCES:
+        user_option_part = "Consider using the `--user` option"
+        permissions_part = "Check the permissions"
+
+        if not using_user_site:
+            parts.extend([
+                user_option_part, " or ",
+                permissions_part.lower(),
+            ])
+        else:
+            parts.append(permissions_part)
+        parts.append(".\n")
+
+    return "".join(parts).strip() + "\n"