| """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.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: Pep517HookCaller, 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 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): |
| 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) |
