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"""Metadata generation logic for source distributions.
"""
import os
from pip._vendor.pep517.wrappers import Pep517HookCaller
from pip._internal.build_env import BuildEnvironment
from pip._internal.utils.subprocess import runner_with_spinner_message
from pip._internal.utils.temp_dir import TempDirectory
def generate_metadata(build_env: BuildEnvironment, backend: 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 metadata (pyproject.toml)")
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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