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import logging
from typing import Iterable, Set, Tuple
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.metadata import BaseDistribution
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_metadata_distribution(self) -> BaseDistribution:
from pip._internal.metadata.pkg_resources import Distribution as _Dist
return _Dist(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:
# Setup an isolated environment and install the build backend static
# requirements in it.
self._prepare_build_backend(finder)
# Check that if the requirement is editable, it either supports PEP 660 or
# has a setup.py or a setup.cfg. This cannot be done earlier because we need
# to setup the build backend to verify it supports build_editable, nor can
# it be done later, because we want to avoid installing build requirements
# needlessly. Doing it here also works around setuptools generating
# UNKNOWN.egg-info when running get_requires_for_build_wheel on a directory
# without setup.py nor setup.cfg.
self.req.isolated_editable_sanity_check()
# Install the dynamic build requirements.
self._install_build_reqs(finder)
self.req.prepare_metadata()
def _prepare_build_backend(self, finder: PackageFinder) -> None:
# 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:
self._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))),
)
def _get_build_requires_wheel(self) -> Iterable[str]:
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):
return backend.get_requires_for_build_wheel()
def _get_build_requires_editable(self) -> Iterable[str]:
with self.req.build_env:
runner = runner_with_spinner_message(
"Getting requirements to build editable"
)
backend = self.req.pep517_backend
assert backend is not None
with backend.subprocess_runner(runner):
return backend.get_requires_for_build_editable()
def _install_build_reqs(self, finder: PackageFinder) -> None:
# 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.
if (
self.req.editable
and self.req.permit_editable_wheels
and self.req.supports_pyproject_editable()
):
build_reqs = self._get_build_requires_editable()
else:
build_reqs = self._get_build_requires_wheel()
conflicting, missing = self.req.build_env.check_requirements(build_reqs)
if conflicting:
self._raise_conflicts("the backend dependencies", conflicting)
self.req.build_env.install_requirements(
finder, missing, "normal", "Installing backend dependencies"
)
def _raise_conflicts(
self, 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_reqs)
),
)
raise InstallationError(error_message)
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