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| import importlib.util | |
| import os | |
| from collections import namedtuple | |
| from typing import Any, List, Optional | |
| from pip._vendor import tomli | |
| from pip._vendor.packaging.requirements import InvalidRequirement, Requirement | |
| from pip._internal.exceptions import ( | |
| InstallationError, | |
| InvalidPyProjectBuildRequires, | |
| MissingPyProjectBuildRequires, | |
| ) | |
| def _is_list_of_str(obj: Any) -> bool: | |
| return isinstance(obj, list) and all(isinstance(item, str) for item in obj) | |
| def make_pyproject_path(unpacked_source_directory: str) -> str: | |
| return os.path.join(unpacked_source_directory, "pyproject.toml") | |
| BuildSystemDetails = namedtuple( | |
| "BuildSystemDetails", ["requires", "backend", "check", "backend_path"] | |
| ) | |
| def load_pyproject_toml( | |
| use_pep517: Optional[bool], pyproject_toml: str, setup_py: str, req_name: str | |
| ) -> Optional[BuildSystemDetails]: | |
| """Load the pyproject.toml file. | |
| Parameters: | |
| use_pep517 - Has the user requested PEP 517 processing? None | |
| means the user hasn't explicitly specified. | |
| pyproject_toml - Location of the project's pyproject.toml file | |
| setup_py - Location of the project's setup.py file | |
| req_name - The name of the requirement we're processing (for | |
| error reporting) | |
| Returns: | |
| None if we should use the legacy code path, otherwise a tuple | |
| ( | |
| requirements from pyproject.toml, | |
| name of PEP 517 backend, | |
| requirements we should check are installed after setting | |
| up the build environment | |
| directory paths to import the backend from (backend-path), | |
| relative to the project root. | |
| ) | |
| """ | |
| has_pyproject = os.path.isfile(pyproject_toml) | |
| has_setup = os.path.isfile(setup_py) | |
| if not has_pyproject and not has_setup: | |
| raise InstallationError( | |
| f"{req_name} does not appear to be a Python project: " | |
| f"neither 'setup.py' nor 'pyproject.toml' found." | |
| ) | |
| if has_pyproject: | |
| with open(pyproject_toml, encoding="utf-8") as f: | |
| pp_toml = tomli.loads(f.read()) | |
| build_system = pp_toml.get("build-system") | |
| else: | |
| build_system = None | |
| # The following cases must use PEP 517 | |
| # We check for use_pep517 being non-None and falsey because that means | |
| # the user explicitly requested --no-use-pep517. The value 0 as | |
| # opposed to False can occur when the value is provided via an | |
| # environment variable or config file option (due to the quirk of | |
| # strtobool() returning an integer in pip's configuration code). | |
| if has_pyproject and not has_setup: | |
| if use_pep517 is not None and not use_pep517: | |
| raise InstallationError( | |
| "Disabling PEP 517 processing is invalid: " | |
| "project does not have a setup.py" | |
| ) | |
| use_pep517 = True | |
| elif build_system and "build-backend" in build_system: | |
| if use_pep517 is not None and not use_pep517: | |
| raise InstallationError( | |
| "Disabling PEP 517 processing is invalid: " | |
| "project specifies a build backend of {} " | |
| "in pyproject.toml".format(build_system["build-backend"]) | |
| ) | |
| use_pep517 = True | |
| # If we haven't worked out whether to use PEP 517 yet, | |
| # and the user hasn't explicitly stated a preference, | |
| # we do so if the project has a pyproject.toml file | |
| # or if we cannot import setuptools. | |
| # We fallback to PEP 517 when without setuptools, | |
| # so setuptools can be installed as a default build backend. | |
| # For more info see: | |
| # https://discuss.python.org/t/pip-without-setuptools-could-the-experience-be-improved/11810/9 | |
| elif use_pep517 is None: | |
| use_pep517 = has_pyproject or not importlib.util.find_spec("setuptools") | |
| # At this point, we know whether we're going to use PEP 517. | |
| assert use_pep517 is not None | |
| # If we're using the legacy code path, there is nothing further | |
| # for us to do here. | |
| if not use_pep517: | |
| return None | |
| if build_system is None: | |
| # Either the user has a pyproject.toml with no build-system | |
| # section, or the user has no pyproject.toml, but has opted in | |
| # explicitly via --use-pep517. | |
| # In the absence of any explicit backend specification, we | |
| # assume the setuptools backend that most closely emulates the | |
| # traditional direct setup.py execution, and require wheel and | |
| # a version of setuptools that supports that backend. | |
| build_system = { | |
| "requires": ["setuptools>=40.8.0", "wheel"], | |
| "build-backend": "setuptools.build_meta:__legacy__", | |
| } | |
| # If we're using PEP 517, we have build system information (either | |
| # from pyproject.toml, or defaulted by the code above). | |
| # Note that at this point, we do not know if the user has actually | |
| # specified a backend, though. | |
| assert build_system is not None | |
| # Ensure that the build-system section in pyproject.toml conforms | |
| # to PEP 518. | |
| # Specifying the build-system table but not the requires key is invalid | |
| if "requires" not in build_system: | |
| raise MissingPyProjectBuildRequires(package=req_name) | |
| # Error out if requires is not a list of strings | |
| requires = build_system["requires"] | |
| if not _is_list_of_str(requires): | |
| raise InvalidPyProjectBuildRequires( | |
| package=req_name, | |
| reason="It is not a list of strings.", | |
| ) | |
| # Each requirement must be valid as per PEP 508 | |
| for requirement in requires: | |
| try: | |
| Requirement(requirement) | |
| except InvalidRequirement as error: | |
| raise InvalidPyProjectBuildRequires( | |
| package=req_name, | |
| reason=f"It contains an invalid requirement: {requirement!r}", | |
| ) from error | |
| backend = build_system.get("build-backend") | |
| backend_path = build_system.get("backend-path", []) | |
| check: List[str] = [] | |
| if backend is None: | |
| # If the user didn't specify a backend, we assume they want to use | |
| # the setuptools backend. But we can't be sure they have included | |
| # a version of setuptools which supplies the backend. So we | |
| # make a note to check that this requirement is present once | |
| # we have set up the environment. | |
| # This is quite a lot of work to check for a very specific case. But | |
| # the problem is, that case is potentially quite common - projects that | |
| # adopted PEP 518 early for the ability to specify requirements to | |
| # execute setup.py, but never considered needing to mention the build | |
| # tools themselves. The original PEP 518 code had a similar check (but | |
| # implemented in a different way). | |
| backend = "setuptools.build_meta:__legacy__" | |
| check = ["setuptools>=40.8.0"] | |
| return BuildSystemDetails(requires, backend, check, backend_path) | |