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Edit: /opt/alt/python27/lib/python2.7/site-packages/pip/_internal/operations/install/wheel.py

"""Support for installing and building the "wheel" binary package format.
"""

from __future__ import absolute_import

import collections
import compileall
import contextlib
import csv
import importlib
import logging
import os.path
import re
import shutil
import sys
import warnings
from base64 import urlsafe_b64encode
from itertools import chain, starmap
from zipfile import ZipFile

from pip._vendor import pkg_resources
from pip._vendor.distlib.scripts import ScriptMaker
from pip._vendor.distlib.util import get_export_entry
from pip._vendor.six import (
    PY2,
    ensure_str,
    ensure_text,
    itervalues,
    reraise,
    text_type,
)
from pip._vendor.six.moves import filterfalse, map

from pip._internal.exceptions import InstallationError
from pip._internal.locations import get_major_minor_version
from pip._internal.models.direct_url import DIRECT_URL_METADATA_NAME, DirectUrl
from pip._internal.models.scheme import SCHEME_KEYS
from pip._internal.utils.filesystem import adjacent_tmp_file, replace
from pip._internal.utils.misc import (
    captured_stdout,
    ensure_dir,
    hash_file,
    partition,
)
from pip._internal.utils.typing import MYPY_CHECK_RUNNING
from pip._internal.utils.unpacking import (
    current_umask,
    is_within_directory,
    set_extracted_file_to_default_mode_plus_executable,
    zip_item_is_executable,
)
from pip._internal.utils.wheel import (
    parse_wheel,
    pkg_resources_distribution_for_wheel,
)

# Use the custom cast function at runtime to make cast work,
# and import typing.cast when performing pre-commit and type
# checks
if not MYPY_CHECK_RUNNING:
    from pip._internal.utils.typing import cast
else:
    from email.message import Message
    from typing import (
        Any,
        Callable,
        Dict,
        IO,
        Iterable,
        Iterator,
        List,
        NewType,
        Optional,
        Protocol,
        Sequence,
        Set,
        Tuple,
        Union,
        cast,
    )
    from zipfile import ZipInfo

from pip._vendor.pkg_resources import Distribution

from pip._internal.models.scheme import Scheme
    from pip._internal.utils.filesystem import NamedTemporaryFileResult

RecordPath = NewType('RecordPath', text_type)
    InstalledCSVRow = Tuple[RecordPath, str, Union[int, str]]

class File(Protocol):
        src_record_path = None  # type: RecordPath
        dest_path = None  # type: text_type
        changed = None  # type: bool

def save(self):
            # type: () -> None
            pass

logger = logging.getLogger(__name__)

def rehash(path, blocksize=1 << 20):
    # type: (text_type, int) -> Tuple[str, str]
    """Return (encoded_digest, length) for path using hashlib.sha256()"""
    h, length = hash_file(path, blocksize)
    digest = 'sha256=' + urlsafe_b64encode(
        h.digest()
    ).decode('latin1').rstrip('=')
    # unicode/str python2 issues
    return (digest, str(length))  # type: ignore

def csv_io_kwargs(mode):
    # type: (str) -> Dict[str, Any]
    """Return keyword arguments to properly open a CSV file
    in the given mode.
    """
    if PY2:
        return {'mode': '{}b'.format(mode)}
    else:
        return {'mode': mode, 'newline': '', 'encoding': 'utf-8'}

def fix_script(path):
    # type: (text_type) -> bool
    """Replace #!python with #!/path/to/python
    Return True if file was changed.
    """
    # XXX RECORD hashes will need to be updated
    assert os.path.isfile(path)

with open(path, 'rb') as script:
        firstline = script.readline()
        if not firstline.startswith(b'#!python'):
            return False
        exename = sys.executable.encode(sys.getfilesystemencoding())
        firstline = b'#!' + exename + os.linesep.encode("ascii")
        rest = script.read()
    with open(path, 'wb') as script:
        script.write(firstline)
        script.write(rest)
    return True

def wheel_root_is_purelib(metadata):
    # type: (Message) -> bool
    return metadata.get("Root-Is-Purelib", "").lower() == "true"

def get_entrypoints(distribution):
    # type: (Distribution) -> Tuple[Dict[str, str], Dict[str, str]]
    # get the entry points and then the script names
    try:
        console = distribution.get_entry_map('console_scripts')
        gui = distribution.get_entry_map('gui_scripts')
    except KeyError:
        # Our dict-based Distribution raises KeyError if entry_points.txt
        # doesn't exist.
        return {}, {}

def _split_ep(s):
        # type: (pkg_resources.EntryPoint) -> Tuple[str, str]
        """get the string representation of EntryPoint,
        remove space and split on '='
        """
        split_parts = str(s).replace(" ", "").split("=")
        return split_parts[0], split_parts[1]

# convert the EntryPoint objects into strings with module:function
    console = dict(_split_ep(v) for v in console.values())
    gui = dict(_split_ep(v) for v in gui.values())
    return console, gui

def message_about_scripts_not_on_PATH(scripts):
    # type: (Sequence[str]) -> Optional[str]
    """Determine if any scripts are not on PATH and format a warning.
    Returns a warning message if one or more scripts are not on PATH,
    otherwise None.
    """
    if not scripts:
        return None

# Group scripts by the path they were installed in
    grouped_by_dir = collections.defaultdict(set)  # type: Dict[str, Set[str]]
    for destfile in scripts:
        parent_dir = os.path.dirname(destfile)
        script_name = os.path.basename(destfile)
        grouped_by_dir[parent_dir].add(script_name)

# We don't want to warn for directories that are on PATH.
    not_warn_dirs = [
        os.path.normcase(i).rstrip(os.sep) for i in
        os.environ.get("PATH", "").split(os.pathsep)
    ]
    # If an executable sits with sys.executable, we don't warn for it.
    #     This covers the case of venv invocations without activating the venv.
    not_warn_dirs.append(os.path.normcase(os.path.dirname(sys.executable)))
    warn_for = {
        parent_dir: scripts for parent_dir, scripts in grouped_by_dir.items()
        if os.path.normcase(parent_dir) not in not_warn_dirs
    }  # type: Dict[str, Set[str]]
    if not warn_for:
        return None

# Format a message
    msg_lines = []
    for parent_dir, dir_scripts in warn_for.items():
        sorted_scripts = sorted(dir_scripts)  # type: List[str]
        if len(sorted_scripts) == 1:
            start_text = "script {} is".format(sorted_scripts[0])
        else:
            start_text = "scripts {} are".format(
                ", ".join(sorted_scripts[:-1]) + " and " + sorted_scripts[-1]
            )

msg_lines.append(
            "The {} installed in '{}' which is not on PATH."
            .format(start_text, parent_dir)
        )

last_line_fmt = (
        "Consider adding {} to PATH or, if you prefer "
        "to suppress this warning, use --no-warn-script-location."
    )
    if len(msg_lines) == 1:
        msg_lines.append(last_line_fmt.format("this directory"))
    else:
        msg_lines.append(last_line_fmt.format("these directories"))

# Add a note if any directory starts with ~
    warn_for_tilde = any(
        i[0] == "~" for i in os.environ.get("PATH", "").split(os.pathsep) if i
    )
    if warn_for_tilde:
        tilde_warning_msg = (
            "NOTE: The current PATH contains path(s) starting with `~`, "
            "which may not be expanded by all applications."
        )
        msg_lines.append(tilde_warning_msg)

# Returns the formatted multiline message
    return "\n".join(msg_lines)

def _normalized_outrows(outrows):
    # type: (Iterable[InstalledCSVRow]) -> List[Tuple[str, str, str]]
    """Normalize the given rows of a RECORD file.

Items in each row are converted into str. Rows are then sorted to make
    the value more predictable for tests.

Each row is a 3-tuple (path, hash, size) and corresponds to a record of
    a RECORD file (see PEP 376 and PEP 427 for details).  For the rows
    passed to this function, the size can be an integer as an int or string,
    or the empty string.
    """
    # Normally, there should only be one row per path, in which case the
    # second and third elements don't come into play when sorting.
    # However, in cases in the wild where a path might happen to occur twice,
    # we don't want the sort operation to trigger an error (but still want
    # determinism).  Since the third element can be an int or string, we
    # coerce each element to a string to avoid a TypeError in this case.
    # For additional background, see--
    # https://github.com/pypa/pip/issues/5868
    return sorted(
        (ensure_str(record_path, encoding='utf-8'), hash_, str(size))
        for record_path, hash_, size in outrows
    )

def _record_to_fs_path(record_path):
    # type: (RecordPath) -> text_type
    return record_path

def _fs_to_record_path(path, relative_to=None):
    # type: (text_type, Optional[text_type]) -> RecordPath
    if relative_to is not None:
        # On Windows, do not handle relative paths if they belong to different
        # logical disks
        if os.path.splitdrive(path)[0].lower() == \
                os.path.splitdrive(relative_to)[0].lower():
            path = os.path.relpath(path, relative_to)
    path = path.replace(os.path.sep, '/')
    return cast('RecordPath', path)

def _parse_record_path(record_column):
    # type: (str) -> RecordPath
    p = ensure_text(record_column, encoding='utf-8')
    return cast('RecordPath', p)

def get_csv_rows_for_installed(
    old_csv_rows,  # type: List[List[str]]
    installed,  # type: Dict[RecordPath, RecordPath]
    changed,  # type: Set[RecordPath]
    generated,  # type: List[str]
    lib_dir,  # type: str
):
    # type: (...) -> List[InstalledCSVRow]
    """
    :param installed: A map from archive RECORD path to installation RECORD
        path.
    """
    installed_rows = []  # type: List[InstalledCSVRow]
    for row in old_csv_rows:
        if len(row) > 3:
            logger.warning('RECORD line has more than three elements: %s', row)
        old_record_path = _parse_record_path(row[0])
        new_record_path = installed.pop(old_record_path, old_record_path)
        if new_record_path in changed:
            digest, length = rehash(_record_to_fs_path(new_record_path))
        else:
            digest = row[1] if len(row) > 1 else ''
            length = row[2] if len(row) > 2 else ''
        installed_rows.append((new_record_path, digest, length))
    for f in generated:
        path = _fs_to_record_path(f, lib_dir)
        digest, length = rehash(f)
        installed_rows.append((path, digest, length))
    for installed_record_path in itervalues(installed):
        installed_rows.append((installed_record_path, '', ''))
    return installed_rows

def get_console_script_specs(console):
    # type: (Dict[str, str]) -> List[str]
    """
    Given the mapping from entrypoint name to callable, return the relevant
    console script specs.
    """
    # Don't mutate caller's version
    console = console.copy()

scripts_to_generate = []

# Special case pip and setuptools to generate versioned wrappers
    #
    # The issue is that some projects (specifically, pip and setuptools) use
    # code in setup.py to create "versioned" entry points - pip2.7 on Python
    # 2.7, pip3.3 on Python 3.3, etc. But these entry points are baked into
    # the wheel metadata at build time, and so if the wheel is installed with
    # a *different* version of Python the entry points will be wrong. The
    # correct fix for this is to enhance the metadata to be able to describe
    # such versioned entry points, but that won't happen till Metadata 2.0 is
    # available.
    # In the meantime, projects using versioned entry points will either have
    # incorrect versioned entry points, or they will not be able to distribute
    # "universal" wheels (i.e., they will need a wheel per Python version).
    #
    # Because setuptools and pip are bundled with _ensurepip and virtualenv,
    # we need to use universal wheels. So, as a stopgap until Metadata 2.0, we
    # override the versioned entry points in the wheel and generate the
    # correct ones. This code is purely a short-term measure until Metadata 2.0
    # is available.
    #
    # To add the level of hack in this section of code, in order to support
    # ensurepip this code will look for an ``ENSUREPIP_OPTIONS`` environment
    # variable which will control which version scripts get installed.
    #
    # ENSUREPIP_OPTIONS=altinstall
    #   - Only pipX.Y and easy_install-X.Y will be generated and installed
    # ENSUREPIP_OPTIONS=install
    #   - pipX.Y, pipX, easy_install-X.Y will be generated and installed. Note
    #     that this option is technically if ENSUREPIP_OPTIONS is set and is
    #     not altinstall
    # DEFAULT
    #   - The default behavior is to install pip, pipX, pipX.Y, easy_install
    #     and easy_install-X.Y.
    pip_script = console.pop('pip', None)
    if pip_script:
        if "ENSUREPIP_OPTIONS" not in os.environ:
            scripts_to_generate.append('pip = ' + pip_script)

if os.environ.get("ENSUREPIP_OPTIONS", "") != "altinstall":
            scripts_to_generate.append(
                'pip{} = {}'.format(sys.version_info[0], pip_script)
            )

scripts_to_generate.append(
            'pip{} = {}'.format(get_major_minor_version(), pip_script)
        )
        # Delete any other versioned pip entry points
        pip_ep = [k for k in console if re.match(r'pip(\d(\.\d)?)?$', k)]
        for k in pip_ep:
            del console[k]
    easy_install_script = console.pop('easy_install', None)
    if easy_install_script:
        if "ENSUREPIP_OPTIONS" not in os.environ:
            scripts_to_generate.append(
                'easy_install = ' + easy_install_script
            )

scripts_to_generate.append(
            'easy_install-{} = {}'.format(
                get_major_minor_version(), easy_install_script
            )
        )
        # Delete any other versioned easy_install entry points
        easy_install_ep = [
            k for k in console if re.match(r'easy_install(-\d\.\d)?$', k)
        ]
        for k in easy_install_ep:
            del console[k]

# Generate the console entry points specified in the wheel
    scripts_to_generate.extend(starmap('{} = {}'.format, console.items()))

return scripts_to_generate

class ZipBackedFile(object):
    def __init__(self, src_record_path, dest_path, zip_file):
        # type: (RecordPath, text_type, ZipFile) -> None
        self.src_record_path = src_record_path
        self.dest_path = dest_path
        self._zip_file = zip_file
        self.changed = False

def _getinfo(self):
        # type: () -> ZipInfo
        if not PY2:
            return self._zip_file.getinfo(self.src_record_path)
        # Python 2 does not expose a way to detect a ZIP's encoding, but the
        # wheel specification (PEP 427) explicitly mandates that paths should
        # use UTF-8, so we assume it is true.
        return self._zip_file.getinfo(self.src_record_path.encode("utf-8"))

def save(self):
        # type: () -> None
        # directory creation is lazy and after file filtering
        # to ensure we don't install empty dirs; empty dirs can't be
        # uninstalled.
        parent_dir = os.path.dirname(self.dest_path)
        ensure_dir(parent_dir)

# When we open the output file below, any existing file is truncated
        # before we start writing the new contents. This is fine in most
        # cases, but can cause a segfault if pip has loaded a shared
        # object (e.g. from pyopenssl through its vendored urllib3)
        # Since the shared object is mmap'd an attempt to call a
        # symbol in it will then cause a segfault. Unlinking the file
        # allows writing of new contents while allowing the process to
        # continue to use the old copy.
        if os.path.exists(self.dest_path):
            os.unlink(self.dest_path)

zipinfo = self._getinfo()

with self._zip_file.open(zipinfo) as f:
            with open(self.dest_path, "wb") as dest:
                shutil.copyfileobj(f, dest)

if zip_item_is_executable(zipinfo):
            set_extracted_file_to_default_mode_plus_executable(self.dest_path)

class ScriptFile(object):
    def __init__(self, file):
        # type: (File) -> None
        self._file = file
        self.src_record_path = self._file.src_record_path
        self.dest_path = self._file.dest_path
        self.changed = False

def save(self):
        # type: () -> None
        self._file.save()
        self.changed = fix_script(self.dest_path)

class MissingCallableSuffix(InstallationError):
    def __init__(self, entry_point):
        # type: (str) -> None
        super(MissingCallableSuffix, self).__init__(
            "Invalid script entry point: {} - A callable "
            "suffix is required. Cf https://packaging.python.org/"
            "specifications/entry-points/#use-for-scripts for more "
            "information.".format(entry_point)
        )

def _raise_for_invalid_entrypoint(specification):
    # type: (str) -> None
    entry = get_export_entry(specification)
    if entry is not None and entry.suffix is None:
        raise MissingCallableSuffix(str(entry))

class PipScriptMaker(ScriptMaker):
    def make(self, specification, options=None):
        # type: (str, Dict[str, Any]) -> List[str]
        _raise_for_invalid_entrypoint(specification)
        return super(PipScriptMaker, self).make(specification, options)

def _install_wheel(
    name,  # type: str
    wheel_zip,  # type: ZipFile
    wheel_path,  # type: str
    scheme,  # type: Scheme
    pycompile=True,  # type: bool
    warn_script_location=True,  # type: bool
    direct_url=None,  # type: Optional[DirectUrl]
    requested=False,  # type: bool
):
    # type: (...) -> None
    """Install a wheel.

:param name: Name of the project to install
    :param wheel_zip: open ZipFile for wheel being installed
    :param scheme: Distutils scheme dictating the install directories
    :param req_description: String used in place of the requirement, for
        logging
    :param pycompile: Whether to byte-compile installed Python files
    :param warn_script_location: Whether to check that scripts are installed
        into a directory on PATH
    :raises UnsupportedWheel:
        * when the directory holds an unpacked wheel with incompatible
          Wheel-Version
        * when the .dist-info dir does not match the wheel
    """
    info_dir, metadata = parse_wheel(wheel_zip, name)

if wheel_root_is_purelib(metadata):
        lib_dir = scheme.purelib
    else:
        lib_dir = scheme.platlib

# Record details of the files moved
    #   installed = files copied from the wheel to the destination
    #   changed = files changed while installing (scripts #! line typically)
    #   generated = files newly generated during the install (script wrappers)
    installed = {}  # type: Dict[RecordPath, RecordPath]
    changed = set()  # type: Set[RecordPath]
    generated = []  # type: List[str]

def record_installed(srcfile, destfile, modified=False):
        # type: (RecordPath, text_type, bool) -> None
        """Map archive RECORD paths to installation RECORD paths."""
        newpath = _fs_to_record_path(destfile, lib_dir)
        installed[srcfile] = newpath
        if modified:
            changed.add(_fs_to_record_path(destfile))

def all_paths():
        # type: () -> Iterable[RecordPath]
        names = wheel_zip.namelist()
        # If a flag is set, names may be unicode in Python 2. We convert to
        # text explicitly so these are valid for lookup in RECORD.
        decoded_names = map(ensure_text, names)
        for name in decoded_names:
            yield cast("RecordPath", name)

def is_dir_path(path):
        # type: (RecordPath) -> bool
        return path.endswith("/")

def assert_no_path_traversal(dest_dir_path, target_path):
        # type: (text_type, text_type) -> None
        if not is_within_directory(dest_dir_path, target_path):
            message = (
                "The wheel {!r} has a file {!r} trying to install"
                " outside the target directory {!r}"
            )
            raise InstallationError(
                message.format(wheel_path, target_path, dest_dir_path)
            )

def root_scheme_file_maker(zip_file, dest):
        # type: (ZipFile, text_type) -> Callable[[RecordPath], File]
        def make_root_scheme_file(record_path):
            # type: (RecordPath) -> File
            normed_path = os.path.normpath(record_path)
            dest_path = os.path.join(dest, normed_path)
            assert_no_path_traversal(dest, dest_path)
            return ZipBackedFile(record_path, dest_path, zip_file)

return make_root_scheme_file

def data_scheme_file_maker(zip_file, scheme):
        # type: (ZipFile, Scheme) -> Callable[[RecordPath], File]
        scheme_paths = {}
        for key in SCHEME_KEYS:
            encoded_key = ensure_text(key)
            scheme_paths[encoded_key] = ensure_text(
                getattr(scheme, key), encoding=sys.getfilesystemencoding()
            )

def make_data_scheme_file(record_path):
            # type: (RecordPath) -> File
            normed_path = os.path.normpath(record_path)
            try:
                _, scheme_key, dest_subpath = normed_path.split(os.path.sep, 2)
            except ValueError:
                message = (
                    "Unexpected file in {}: {!r}. .data directory contents"
                    " should be named like: '<scheme key>/<path>'."
                ).format(wheel_path, record_path)
                raise InstallationError(message)

try:
                scheme_path = scheme_paths[scheme_key]
            except KeyError:
                valid_scheme_keys = ", ".join(sorted(scheme_paths))
                message = (
                    "Unknown scheme key used in {}: {} (for file {!r}). .data"
                    " directory contents should be in subdirectories named"
                    " with a valid scheme key ({})"
                ).format(
                    wheel_path, scheme_key, record_path, valid_scheme_keys
                )
                raise InstallationError(message)

dest_path = os.path.join(scheme_path, dest_subpath)
            assert_no_path_traversal(scheme_path, dest_path)
            return ZipBackedFile(record_path, dest_path, zip_file)

return make_data_scheme_file

def is_data_scheme_path(path):
        # type: (RecordPath) -> bool
        return path.split("/", 1)[0].endswith(".data")

paths = all_paths()
    file_paths = filterfalse(is_dir_path, paths)
    root_scheme_paths, data_scheme_paths = partition(
        is_data_scheme_path, file_paths
    )

make_root_scheme_file = root_scheme_file_maker(
        wheel_zip,
        ensure_text(lib_dir, encoding=sys.getfilesystemencoding()),
    )
    files = map(make_root_scheme_file, root_scheme_paths)

def is_script_scheme_path(path):
        # type: (RecordPath) -> bool
        parts = path.split("/", 2)
        return (
            len(parts) > 2 and
            parts[0].endswith(".data") and
            parts[1] == "scripts"
        )

other_scheme_paths, script_scheme_paths = partition(
        is_script_scheme_path, data_scheme_paths
    )

make_data_scheme_file = data_scheme_file_maker(wheel_zip, scheme)
    other_scheme_files = map(make_data_scheme_file, other_scheme_paths)
    files = chain(files, other_scheme_files)

# Get the defined entry points
    distribution = pkg_resources_distribution_for_wheel(
        wheel_zip, name, wheel_path
    )
    console, gui = get_entrypoints(distribution)

def is_entrypoint_wrapper(file):
        # type: (File) -> bool
        # EP, EP.exe and EP-script.py are scripts generated for
        # entry point EP by setuptools
        path = file.dest_path
        name = os.path.basename(path)
        if name.lower().endswith('.exe'):
            matchname = name[:-4]
        elif name.lower().endswith('-script.py'):
            matchname = name[:-10]
        elif name.lower().endswith(".pya"):
            matchname = name[:-4]
        else:
            matchname = name
        # Ignore setuptools-generated scripts
        return (matchname in console or matchname in gui)

script_scheme_files = map(make_data_scheme_file, script_scheme_paths)
    script_scheme_files = filterfalse(
        is_entrypoint_wrapper, script_scheme_files
    )
    script_scheme_files = map(ScriptFile, script_scheme_files)
    files = chain(files, script_scheme_files)

for file in files:
        file.save()
        record_installed(file.src_record_path, file.dest_path, file.changed)

def pyc_source_file_paths():
        # type: () -> Iterator[text_type]
        # We de-duplicate installation paths, since there can be overlap (e.g.
        # file in .data maps to same location as file in wheel root).
        # Sorting installation paths makes it easier to reproduce and debug
        # issues related to permissions on existing files.
        for installed_path in sorted(set(installed.values())):
            full_installed_path = os.path.join(lib_dir, installed_path)
            if not os.path.isfile(full_installed_path):
                continue
            if not full_installed_path.endswith('.py'):
                continue
            yield full_installed_path

def pyc_output_path(path):
        # type: (text_type) -> text_type
        """Return the path the pyc file would have been written to.
        """
        if PY2:
            if sys.flags.optimize:
                return path + 'o'
            else:
                return path + 'c'
        else:
            return importlib.util.cache_from_source(path)

# Compile all of the pyc files for the installed files
    if pycompile:
        with captured_stdout() as stdout:
            with warnings.catch_warnings():
                warnings.filterwarnings('ignore')
                for path in pyc_source_file_paths():
                    # Python 2's `compileall.compile_file` requires a str in
                    # error cases, so we must convert to the native type.
                    path_arg = ensure_str(
                        path, encoding=sys.getfilesystemencoding()
                    )
                    success = compileall.compile_file(
                        path_arg, force=True, quiet=True
                    )
                    if success:
                        pyc_path = pyc_output_path(path)
                        assert os.path.exists(pyc_path)
                        pyc_record_path = cast(
                            "RecordPath", pyc_path.replace(os.path.sep, "/")
                        )
                        record_installed(pyc_record_path, pyc_path)
        logger.debug(stdout.getvalue())

maker = PipScriptMaker(None, scheme.scripts)

# Ensure old scripts are overwritten.
    # See https://github.com/pypa/pip/issues/1800
    maker.clobber = True

# Ensure we don't generate any variants for scripts because this is almost
    # never what somebody wants.
    # See https://bitbucket.org/pypa/distlib/issue/35/
    maker.variants = {''}

# This is required because otherwise distlib creates scripts that are not
    # executable.
    # See https://bitbucket.org/pypa/distlib/issue/32/
    maker.set_mode = True

# Generate the console and GUI entry points specified in the wheel
    scripts_to_generate = get_console_script_specs(console)

gui_scripts_to_generate = list(starmap('{} = {}'.format, gui.items()))

generated_console_scripts = maker.make_multiple(scripts_to_generate)
    generated.extend(generated_console_scripts)

generated.extend(
        maker.make_multiple(gui_scripts_to_generate, {'gui': True})
    )

if warn_script_location:
        msg = message_about_scripts_not_on_PATH(generated_console_scripts)
        if msg is not None:
            logger.warning(msg)

generated_file_mode = 0o666 & ~current_umask()

@contextlib.contextmanager
    def _generate_file(path, **kwargs):
        # type: (str, **Any) -> Iterator[NamedTemporaryFileResult]
        with adjacent_tmp_file(path, **kwargs) as f:
            yield f
        os.chmod(f.name, generated_file_mode)
        replace(f.name, path)

dest_info_dir = os.path.join(lib_dir, info_dir)

# Record pip as the installer
    installer_path = os.path.join(dest_info_dir, 'INSTALLER')
    with _generate_file(installer_path) as installer_file:
        installer_file.write(b'pip\n')
    generated.append(installer_path)

# Record the PEP 610 direct URL reference
    if direct_url is not None:
        direct_url_path = os.path.join(dest_info_dir, DIRECT_URL_METADATA_NAME)
        with _generate_file(direct_url_path) as direct_url_file:
            direct_url_file.write(direct_url.to_json().encode("utf-8"))
        generated.append(direct_url_path)

# Record the REQUESTED file
    if requested:
        requested_path = os.path.join(dest_info_dir, 'REQUESTED')
        with open(requested_path, "w"):
            pass
        generated.append(requested_path)

record_text = distribution.get_metadata('RECORD')
    record_rows = list(csv.reader(record_text.splitlines()))

rows = get_csv_rows_for_installed(
        record_rows,
        installed=installed,
        changed=changed,
        generated=generated,
        lib_dir=lib_dir)

# Record details of all files installed
    record_path = os.path.join(dest_info_dir, 'RECORD')

with _generate_file(record_path, **csv_io_kwargs('w')) as record_file:
        # The type mypy infers for record_file is different for Python 3
        # (typing.IO[Any]) and Python 2 (typing.BinaryIO). We explicitly
        # cast to typing.IO[str] as a workaround.
        writer = csv.writer(cast('IO[str]', record_file))
        writer.writerows(_normalized_outrows(rows))

@contextlib.contextmanager
def req_error_context(req_description):
    # type: (str) -> Iterator[None]
    try:
        yield
    except InstallationError as e:
        message = "For req: {}. {}".format(req_description, e.args[0])
        reraise(
            InstallationError, InstallationError(message), sys.exc_info()[2]
        )

def install_wheel(
    name,  # type: str
    wheel_path,  # type: str
    scheme,  # type: Scheme
    req_description,  # type: str
    pycompile=True,  # type: bool
    warn_script_location=True,  # type: bool
    direct_url=None,  # type: Optional[DirectUrl]
    requested=False,  # type: bool
):
    # type: (...) -> None
    with ZipFile(wheel_path, allowZip64=True) as z:
        with req_error_context(req_description):
            _install_wheel(
                name=name,
                wheel_zip=z,
                wheel_path=wheel_path,
                scheme=scheme,
                pycompile=pycompile,
                warn_script_location=warn_script_location,
                direct_url=direct_url,
                requested=requested,
            )

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