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144 lines
5.4 KiB
144 lines
5.4 KiB
from __future__ import absolute_import
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import io
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import os
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from pip._vendor import pytoml, six
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from pip._internal.exceptions import InstallationError
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def _is_list_of_str(obj):
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return (
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isinstance(obj, list) and
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all(isinstance(item, six.string_types) for item in obj)
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)
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def load_pyproject_toml(use_pep517, pyproject_toml, setup_py, req_name):
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"""Load the pyproject.toml file.
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Parameters:
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use_pep517 - Has the user requested PEP 517 processing? None
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means the user hasn't explicitly specified.
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pyproject_toml - Location of the project's pyproject.toml file
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setup_py - Location of the project's setup.py file
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req_name - The name of the requirement we're processing (for
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error reporting)
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Returns:
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None if we should use the legacy code path, otherwise a tuple
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(
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requirements from pyproject.toml,
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name of PEP 517 backend,
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requirements we should check are installed after setting
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up the build environment
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)
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"""
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has_pyproject = os.path.isfile(pyproject_toml)
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has_setup = os.path.isfile(setup_py)
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if has_pyproject:
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with io.open(pyproject_toml, encoding="utf-8") as f:
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pp_toml = pytoml.load(f)
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build_system = pp_toml.get("build-system")
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else:
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build_system = None
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# The following cases must use PEP 517
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# We check for use_pep517 equalling False because that
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# means the user explicitly requested --no-use-pep517
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if has_pyproject and not has_setup:
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if use_pep517 is False:
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raise InstallationError(
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"Disabling PEP 517 processing is invalid: "
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"project does not have a setup.py"
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)
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use_pep517 = True
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elif build_system and "build-backend" in build_system:
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if use_pep517 is False:
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raise InstallationError(
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"Disabling PEP 517 processing is invalid: "
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"project specifies a build backend of {} "
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"in pyproject.toml".format(
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build_system["build-backend"]
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)
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)
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use_pep517 = True
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# If we haven't worked out whether to use PEP 517 yet,
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# and the user hasn't explicitly stated a preference,
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# we do so if the project has a pyproject.toml file.
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elif use_pep517 is None:
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use_pep517 = has_pyproject
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# At this point, we know whether we're going to use PEP 517.
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assert use_pep517 is not None
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# If we're using the legacy code path, there is nothing further
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# for us to do here.
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if not use_pep517:
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return None
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if build_system is None:
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# Either the user has a pyproject.toml with no build-system
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# section, or the user has no pyproject.toml, but has opted in
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# explicitly via --use-pep517.
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# In the absence of any explicit backend specification, we
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# assume the setuptools backend, and require wheel and a version
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# of setuptools that supports that backend.
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build_system = {
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"requires": ["setuptools>=38.2.5", "wheel"],
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"build-backend": "setuptools.build_meta",
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}
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# If we're using PEP 517, we have build system information (either
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# from pyproject.toml, or defaulted by the code above).
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# Note that at this point, we do not know if the user has actually
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# specified a backend, though.
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assert build_system is not None
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# Ensure that the build-system section in pyproject.toml conforms
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# to PEP 518.
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error_template = (
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"{package} has a pyproject.toml file that does not comply "
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"with PEP 518: {reason}"
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)
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# Specifying the build-system table but not the requires key is invalid
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if "requires" not in build_system:
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raise InstallationError(
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error_template.format(package=req_name, reason=(
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"it has a 'build-system' table but not "
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"'build-system.requires' which is mandatory in the table"
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))
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)
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# Error out if requires is not a list of strings
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requires = build_system["requires"]
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if not _is_list_of_str(requires):
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raise InstallationError(error_template.format(
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package=req_name,
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reason="'build-system.requires' is not a list of strings.",
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))
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backend = build_system.get("build-backend")
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check = []
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if backend is None:
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# If the user didn't specify a backend, we assume they want to use
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# the setuptools backend. But we can't be sure they have included
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# a version of setuptools which supplies the backend, or wheel
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# (which is neede by the backend) in their requirements. So we
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# make a note to check that those requirements are present once
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# we have set up the environment.
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# TODO: Review this - it's quite a lot of work to check for a very
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# specific case. The problem is, that case is potentially quite
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# common - projects that adopted PEP 518 early for the ability to
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# specify requirements to execute setup.py, but never considered
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# needing to mention the build tools themselves. The original PEP
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# 518 code had a similar check (but implemented in a different
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# way).
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backend = "setuptools.build_meta"
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check = ["setuptools>=38.2.5", "wheel"]
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return (requires, backend, check)
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