"""Metadata generation logic for source distributions."""
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import os
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from pip._vendor.pyproject_hooks import BuildBackendHookCaller
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from pip._internal.build_env import BuildEnvironment
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from pip._internal.exceptions import (
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InstallationSubprocessError,
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MetadataGenerationFailed,
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)
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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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def generate_metadata(
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build_env: BuildEnvironment, backend: BuildBackendHookCaller, details: str
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) -> 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(kind="modern-metadata", globally_managed=True)
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metadata_dir = metadata_tmpdir.path
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with build_env:
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# Note that BuildBackendHookCaller 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 metadata (pyproject.toml)")
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with backend.subprocess_runner(runner):
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try:
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distinfo_dir = backend.prepare_metadata_for_build_wheel(metadata_dir)
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except InstallationSubprocessError as error:
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raise MetadataGenerationFailed(package_details=details) from error
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return os.path.join(metadata_dir, distinfo_dir)
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