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Current File : /opt/alt/python310/lib/python3.10/site-packages/pip/_vendor/pep517/in_process/_in_process.py
"""This is invoked in a subprocess to call the build backend hooks.

It expects:
- Command line args: hook_name, control_dir
- Environment variables:
      PEP517_BUILD_BACKEND=entry.point:spec
      PEP517_BACKEND_PATH=paths (separated with os.pathsep)
- control_dir/input.json:
  - {"kwargs": {...}}

Results:
- control_dir/output.json
  - {"return_val": ...}
"""
from glob import glob
from importlib import import_module
import json
import os
import os.path
from os.path import join as pjoin
import re
import shutil
import sys
import traceback

# This file is run as a script, and `import compat` is not zip-safe, so we
# include write_json() and read_json() from compat.py.
#
# Handle reading and writing JSON in UTF-8, on Python 3 and 2.

if sys.version_info[0] >= 3:
    # Python 3
    def write_json(obj, path, **kwargs):
        with open(path, 'w', encoding='utf-8') as f:
            json.dump(obj, f, **kwargs)

    def read_json(path):
        with open(path, 'r', encoding='utf-8') as f:
            return json.load(f)

else:
    # Python 2
    def write_json(obj, path, **kwargs):
        with open(path, 'wb') as f:
            json.dump(obj, f, encoding='utf-8', **kwargs)

    def read_json(path):
        with open(path, 'rb') as f:
            return json.load(f)


class BackendUnavailable(Exception):
    """Raised if we cannot import the backend"""
    def __init__(self, traceback):
        self.traceback = traceback


class BackendInvalid(Exception):
    """Raised if the backend is invalid"""
    def __init__(self, message):
        self.message = message


class HookMissing(Exception):
    """Raised if a hook is missing and we are not executing the fallback"""
    def __init__(self, hook_name=None):
        super(HookMissing, self).__init__(hook_name)
        self.hook_name = hook_name


def contained_in(filename, directory):
    """Test if a file is located within the given directory."""
    filename = os.path.normcase(os.path.abspath(filename))
    directory = os.path.normcase(os.path.abspath(directory))
    return os.path.commonprefix([filename, directory]) == directory


def _build_backend():
    """Find and load the build backend"""
    # Add in-tree backend directories to the front of sys.path.
    backend_path = os.environ.get('PEP517_BACKEND_PATH')
    if backend_path:
        extra_pathitems = backend_path.split(os.pathsep)
        sys.path[:0] = extra_pathitems

    ep = os.environ['PEP517_BUILD_BACKEND']
    mod_path, _, obj_path = ep.partition(':')
    try:
        obj = import_module(mod_path)
    except ImportError:
        raise BackendUnavailable(traceback.format_exc())

    if backend_path:
        if not any(
            contained_in(obj.__file__, path)
            for path in extra_pathitems
        ):
            raise BackendInvalid("Backend was not loaded from backend-path")

    if obj_path:
        for path_part in obj_path.split('.'):
            obj = getattr(obj, path_part)
    return obj


def _supported_features():
    """Return the list of options features supported by the backend.

    Returns a list of strings.
    The only possible value is 'build_editable'.
    """
    backend = _build_backend()
    features = []
    if hasattr(backend, "build_editable"):
        features.append("build_editable")
    return features


def get_requires_for_build_wheel(config_settings):
    """Invoke the optional get_requires_for_build_wheel hook

    Returns [] if the hook is not defined.
    """
    backend = _build_backend()
    try:
        hook = backend.get_requires_for_build_wheel
    except AttributeError:
        return []
    else:
        return hook(config_settings)


def get_requires_for_build_editable(config_settings):
    """Invoke the optional get_requires_for_build_editable hook

    Returns [] if the hook is not defined.
    """
    backend = _build_backend()
    try:
        hook = backend.get_requires_for_build_editable
    except AttributeError:
        return []
    else:
        return hook(config_settings)


def prepare_metadata_for_build_wheel(
        metadata_directory, config_settings, _allow_fallback):
    """Invoke optional prepare_metadata_for_build_wheel

    Implements a fallback by building a wheel if the hook isn't defined,
    unless _allow_fallback is False in which case HookMissing is raised.
    """
    backend = _build_backend()
    try:
        hook = backend.prepare_metadata_for_build_wheel
    except AttributeError:
        if not _allow_fallback:
            raise HookMissing()
        whl_basename = backend.build_wheel(metadata_directory, config_settings)
        return _get_wheel_metadata_from_wheel(whl_basename, metadata_directory,
                                              config_settings)
    else:
        return hook(metadata_directory, config_settings)


def prepare_metadata_for_build_editable(
        metadata_directory, config_settings, _allow_fallback):
    """Invoke optional prepare_metadata_for_build_editable

    Implements a fallback by building an editable wheel if the hook isn't
    defined, unless _allow_fallback is False in which case HookMissing is
    raised.
    """
    backend = _build_backend()
    try:
        hook = backend.prepare_metadata_for_build_editable
    except AttributeError:
        if not _allow_fallback:
            raise HookMissing()
        try:
            build_hook = backend.build_editable
        except AttributeError:
            raise HookMissing(hook_name='build_editable')
        else:
            whl_basename = build_hook(metadata_directory, config_settings)
            return _get_wheel_metadata_from_wheel(whl_basename,
                                                  metadata_directory,
                                                  config_settings)
    else:
        return hook(metadata_directory, config_settings)


WHEEL_BUILT_MARKER = 'PEP517_ALREADY_BUILT_WHEEL'


def _dist_info_files(whl_zip):
    """Identify the .dist-info folder inside a wheel ZipFile."""
    res = []
    for path in whl_zip.namelist():
        m = re.match(r'[^/\\]+-[^/\\]+\.dist-info/', path)
        if m:
            res.append(path)
    if res:
        return res
    raise Exception("No .dist-info folder found in wheel")


def _get_wheel_metadata_from_wheel(
        whl_basename, metadata_directory, config_settings):
    """Extract the metadata from a wheel.

    Fallback for when the build backend does not
    define the 'get_wheel_metadata' hook.
    """
    from zipfile import ZipFile
    with open(os.path.join(metadata_directory, WHEEL_BUILT_MARKER), 'wb'):
        pass  # Touch marker file

    whl_file = os.path.join(metadata_directory, whl_basename)
    with ZipFile(whl_file) as zipf:
        dist_info = _dist_info_files(zipf)
        zipf.extractall(path=metadata_directory, members=dist_info)
    return dist_info[0].split('/')[0]


def _find_already_built_wheel(metadata_directory):
    """Check for a wheel already built during the get_wheel_metadata hook.
    """
    if not metadata_directory:
        return None
    metadata_parent = os.path.dirname(metadata_directory)
    if not os.path.isfile(pjoin(metadata_parent, WHEEL_BUILT_MARKER)):
        return None

    whl_files = glob(os.path.join(metadata_parent, '*.whl'))
    if not whl_files:
        print('Found wheel built marker, but no .whl files')
        return None
    if len(whl_files) > 1:
        print('Found multiple .whl files; unspecified behaviour. '
              'Will call build_wheel.')
        return None

    # Exactly one .whl file
    return whl_files[0]


def build_wheel(wheel_directory, config_settings, metadata_directory=None):
    """Invoke the mandatory build_wheel hook.

    If a wheel was already built in the
    prepare_metadata_for_build_wheel fallback, this
    will copy it rather than rebuilding the wheel.
    """
    prebuilt_whl = _find_already_built_wheel(metadata_directory)
    if prebuilt_whl:
        shutil.copy2(prebuilt_whl, wheel_directory)
        return os.path.basename(prebuilt_whl)

    return _build_backend().build_wheel(wheel_directory, config_settings,
                                        metadata_directory)


def build_editable(wheel_directory, config_settings, metadata_directory=None):
    """Invoke the optional build_editable hook.

    If a wheel was already built in the
    prepare_metadata_for_build_editable fallback, this
    will copy it rather than rebuilding the wheel.
    """
    backend = _build_backend()
    try:
        hook = backend.build_editable
    except AttributeError:
        raise HookMissing()
    else:
        prebuilt_whl = _find_already_built_wheel(metadata_directory)
        if prebuilt_whl:
            shutil.copy2(prebuilt_whl, wheel_directory)
            return os.path.basename(prebuilt_whl)

        return hook(wheel_directory, config_settings, metadata_directory)


def get_requires_for_build_sdist(config_settings):
    """Invoke the optional get_requires_for_build_wheel hook

    Returns [] if the hook is not defined.
    """
    backend = _build_backend()
    try:
        hook = backend.get_requires_for_build_sdist
    except AttributeError:
        return []
    else:
        return hook(config_settings)


class _DummyException(Exception):
    """Nothing should ever raise this exception"""


class GotUnsupportedOperation(Exception):
    """For internal use when backend raises UnsupportedOperation"""
    def __init__(self, traceback):
        self.traceback = traceback


def build_sdist(sdist_directory, config_settings):
    """Invoke the mandatory build_sdist hook."""
    backend = _build_backend()
    try:
        return backend.build_sdist(sdist_directory, config_settings)
    except getattr(backend, 'UnsupportedOperation', _DummyException):
        raise GotUnsupportedOperation(traceback.format_exc())


HOOK_NAMES = {
    'get_requires_for_build_wheel',
    'prepare_metadata_for_build_wheel',
    'build_wheel',
    'get_requires_for_build_editable',
    'prepare_metadata_for_build_editable',
    'build_editable',
    'get_requires_for_build_sdist',
    'build_sdist',
    '_supported_features',
}


def main():
    if len(sys.argv) < 3:
        sys.exit("Needs args: hook_name, control_dir")
    hook_name = sys.argv[1]
    control_dir = sys.argv[2]
    if hook_name not in HOOK_NAMES:
        sys.exit("Unknown hook: %s" % hook_name)
    hook = globals()[hook_name]

    hook_input = read_json(pjoin(control_dir, 'input.json'))

    json_out = {'unsupported': False, 'return_val': None}
    try:
        json_out['return_val'] = hook(**hook_input['kwargs'])
    except BackendUnavailable as e:
        json_out['no_backend'] = True
        json_out['traceback'] = e.traceback
    except BackendInvalid as e:
        json_out['backend_invalid'] = True
        json_out['backend_error'] = e.message
    except GotUnsupportedOperation as e:
        json_out['unsupported'] = True
        json_out['traceback'] = e.traceback
    except HookMissing as e:
        json_out['hook_missing'] = True
        json_out['missing_hook_name'] = e.hook_name or hook_name

    write_json(json_out, pjoin(control_dir, 'output.json'), indent=2)


if __name__ == '__main__':
    main()

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