180 lines
7.0 KiB
Python
180 lines
7.0 KiB
Python
|
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 or wheels.
|
||
|
|
|
||
|
|
# We fallback to PEP 517 when without setuptools or without the wheel package,
|
||
|
|
# 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
|
||
|
|
# https://github.com/pypa/pip/issues/8559
|
||
|
|
elif use_pep517 is None:
|
||
|
|
use_pep517 = (
|
||
|
|
has_pyproject
|
||
|
|
or not importlib.util.find_spec("setuptools")
|
||
|
|
or not importlib.util.find_spec("wheel")
|
||
|
|
)
|
||
|
|
|
||
|
|
# 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)
|