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