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- """Metadata generation logic for source distributions.
- """
- import os
- from pip._internal.utils.subprocess import runner_with_spinner_message
- from pip._internal.utils.temp_dir import TempDirectory
- from pip._internal.utils.typing import MYPY_CHECK_RUNNING
- if MYPY_CHECK_RUNNING:
- from pip._internal.build_env import BuildEnvironment
- from pip._vendor.pep517.wrappers import Pep517HookCaller
- def generate_metadata(build_env, backend):
- # type: (BuildEnvironment, Pep517HookCaller) -> str
- """Generate metadata using mechanisms described in PEP 517.
- Returns the generated metadata directory.
- """
- metadata_tmpdir = TempDirectory(
- kind="modern-metadata", globally_managed=True
- )
- metadata_dir = metadata_tmpdir.path
- with build_env:
- # Note that Pep517HookCaller implements a fallback for
- # prepare_metadata_for_build_wheel, so we don't have to
- # consider the possibility that this hook doesn't exist.
- runner = runner_with_spinner_message("Preparing wheel metadata")
- with backend.subprocess_runner(runner):
- distinfo_dir = backend.prepare_metadata_for_build_wheel(
- metadata_dir
- )
- return os.path.join(metadata_dir, distinfo_dir)
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