"""Metadata generation logic for source distributions.""" import os from pip._vendor.pyproject_hooks import BuildBackendHookCaller from pip._internal.build_env import BuildEnvironment from pip._internal.exceptions import ( InstallationSubprocessError, MetadataGenerationFailed, ) 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: BuildBackendHookCaller, details: str ) -> 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 BuildBackendHookCaller 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): try: distinfo_dir = backend.prepare_metadata_for_build_wheel(metadata_dir) except InstallationSubprocessError as error: raise MetadataGenerationFailed(package_details=details) from error return os.path.join(metadata_dir, distinfo_dir)