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| import logging | |
| from typing import Set, Tuple | |
| from pip._vendor.pkg_resources import Distribution | |
| from pip._internal.build_env import BuildEnvironment | |
| from pip._internal.distributions.base import AbstractDistribution | |
| from pip._internal.exceptions import InstallationError | |
| from pip._internal.index.package_finder import PackageFinder | |
| from pip._internal.utils.subprocess import runner_with_spinner_message | |
| logger = logging.getLogger(__name__) | |
| class SourceDistribution(AbstractDistribution): | |
| """Represents a source distribution. | |
| The preparation step for these needs metadata for the packages to be | |
| generated, either using PEP 517 or using the legacy `setup.py egg_info`. | |
| """ | |
| def get_pkg_resources_distribution(self) -> Distribution: | |
| return self.req.get_dist() | |
| def prepare_distribution_metadata( | |
| self, finder: PackageFinder, build_isolation: bool | |
| ) -> None: | |
| # Load pyproject.toml, to determine whether PEP 517 is to be used | |
| self.req.load_pyproject_toml() | |
| # Set up the build isolation, if this requirement should be isolated | |
| should_isolate = self.req.use_pep517 and build_isolation | |
| if should_isolate: | |
| self._setup_isolation(finder) | |
| self.req.prepare_metadata() | |
| def _setup_isolation(self, finder: PackageFinder) -> None: | |
| def _raise_conflicts( | |
| conflicting_with: str, conflicting_reqs: Set[Tuple[str, str]] | |
| ) -> None: | |
| format_string = ( | |
| "Some build dependencies for {requirement} " | |
| "conflict with {conflicting_with}: {description}." | |
| ) | |
| error_message = format_string.format( | |
| requirement=self.req, | |
| conflicting_with=conflicting_with, | |
| description=", ".join( | |
| f"{installed} is incompatible with {wanted}" | |
| for installed, wanted in sorted(conflicting) | |
| ), | |
| ) | |
| raise InstallationError(error_message) | |
| # Isolate in a BuildEnvironment and install the build-time | |
| # requirements. | |
| pyproject_requires = self.req.pyproject_requires | |
| assert pyproject_requires is not None | |
| self.req.build_env = BuildEnvironment() | |
| self.req.build_env.install_requirements( | |
| finder, pyproject_requires, "overlay", "Installing build dependencies" | |
| ) | |
| conflicting, missing = self.req.build_env.check_requirements( | |
| self.req.requirements_to_check | |
| ) | |
| if conflicting: | |
| _raise_conflicts("PEP 517/518 supported requirements", conflicting) | |
| if missing: | |
| logger.warning( | |
| "Missing build requirements in pyproject.toml for %s.", | |
| self.req, | |
| ) | |
| logger.warning( | |
| "The project does not specify a build backend, and " | |
| "pip cannot fall back to setuptools without %s.", | |
| " and ".join(map(repr, sorted(missing))), | |
| ) | |
| # Install any extra build dependencies that the backend requests. | |
| # This must be done in a second pass, as the pyproject.toml | |
| # dependencies must be installed before we can call the backend. | |
| with self.req.build_env: | |
| runner = runner_with_spinner_message("Getting requirements to build wheel") | |
| backend = self.req.pep517_backend | |
| assert backend is not None | |
| with backend.subprocess_runner(runner): | |
| reqs = backend.get_requires_for_build_wheel() | |
| conflicting, missing = self.req.build_env.check_requirements(reqs) | |
| if conflicting: | |
| _raise_conflicts("the backend dependencies", conflicting) | |
| self.req.build_env.install_requirements( | |
| finder, missing, "normal", "Installing backend dependencies" | |
| ) | |