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import logging
from pip._internal.build_env import BuildEnvironment
from pip._internal.distributions.base import AbstractDistribution
from pip._internal.exceptions import InstallationError
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`.
NOTE from @pradyunsg (14 June 2019)
I expect SourceDistribution class will need to be split into
`legacy_source` (setup.py based) and `source` (PEP 517 based) when we start
bringing logic for preparation out of InstallRequirement into this class.
"""
def get_pkg_resources_distribution(self):
return self.req.get_dist()
def prepare_distribution_metadata(self, finder, build_isolation):
# Prepare for building. We need to:
# 1. Load pyproject.toml (if it exists)
# 2. Set up the build environment
self.req.load_pyproject_toml()
should_isolate = self.req.use_pep517 and build_isolation
def _raise_conflicts(conflicting_with, conflicting_reqs):
raise InstallationError(
"Some build dependencies for %s conflict with %s: %s." % (
self.req, conflicting_with, ', '.join(
'%s is incompatible with %s' % (installed, wanted)
for installed, wanted in sorted(conflicting))))
if should_isolate:
# Isolate in a BuildEnvironment and install the build-time
# requirements.
self.req.build_env = BuildEnvironment()
self.req.build_env.install_requirements(
finder, self.req.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:
# We need to have the env active when calling the hook.
self.req.spin_message = "Getting requirements to build wheel"
reqs = self.req.pep517_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"
)
self.req.prepare_metadata()
self.req.assert_source_matches_version()
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