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import contextlib
import importlib
import os
import pathlib
import shutil
import sys
# ---
BACKENDS = {
"setuptools": "setuptools.build_meta",
"skbuild": "scikit_build_core.setuptools.build_meta",
"mesonpy": "mesonpy",
}
def get_build_backend_name(name=None):
if name is None:
name = os.environ.get("MPI4PY_BUILD_BACKEND", "")
name = name.lower().replace("_", "-")
if name in ("default", ""):
for name, module_name in BACKENDS.items():
if name != "setuptools":
if module_name in sys.modules:
return name
return "setuptools"
if name in ("setuptools", "setup"):
return "setuptools"
if name in ("scikit-build-core", "scikit-build", "skbuild", "cmake"):
return "skbuild"
if name in ("meson-python", "mesonpy", "meson"):
return "mesonpy"
raise RuntimeError(f"Unknown build backend {name!r}")
def build_backend(name=None):
name = get_build_backend_name(name)
return importlib.import_module(BACKENDS[name])
def read_build_requires(name):
confdir = pathlib.Path(__file__).resolve().parent
basename = f"requirements-build-{name}.txt"
filename = confdir / basename
with filename.open(encoding="utf-8") as f:
return [req for req in map(str.strip, f) if req]
def get_backend_requires_fast(backend, dist, config_settings=None):
if backend is None or isinstance(backend, str):
try:
backend = build_backend(backend)
except ImportError:
return None
requires = []
get_requires = getattr(backend, f"get_requires_for_build_{dist}", None)
if get_requires is not None:
requires += get_requires(config_settings)
return requires
def get_backend_requires_hook(name, dist, config_settings=None):
try:
from pyproject_hooks import BuildBackendHookCaller
except ImportError:
from pep517.wrappers import Pep517HookCaller as BuildBackendHookCaller
try:
from build.env import DefaultIsolatedEnv
except ImportError:
from build.env import IsolatedEnvBuilder
class DefaultIsolatedEnv(IsolatedEnvBuilder):
def __enter__(self):
env = super().__enter__()
env.python_executable = env.executable
def make_extra_environ():
path = os.environ.get("PATH")
return {
"PATH": os.pathsep.join([env.scripts_dir, path])
if path is not None
else env.scripts_dir,
}
env.make_extra_environ = make_extra_environ
return env
@contextlib.contextmanager
def environment(path):
environ_prev = [("PATH", os.environ["PATH"])]
for prefix in ("_PYPROJECT_HOOKS", "PEP517"):
for suffix in ("BUILD_BACKEND", "BACKEND_PATH"):
key = f"{prefix}_{suffix}"
if key in os.environ:
val = os.environ.pop(key)
environ_prev.append((key, val))
os.environ["PATH"] = path
try:
yield None
finally:
os.environ.update(environ_prev)
requires = read_build_requires(name)
with DefaultIsolatedEnv() as env:
path = env.make_extra_environ()["PATH"]
python_executable = env.python_executable
with environment(path):
env.install(requires)
hook = BuildBackendHookCaller(
source_dir=pathlib.Path.cwd(),
build_backend=BACKENDS[name],
python_executable=python_executable,
)
requires += get_backend_requires_fast(hook, dist, config_settings)
return requires
def get_requires_for_build(dist, config_settings=None):
name = get_build_backend_name()
requires = get_backend_requires_fast(name, dist, config_settings)
if requires is None:
requires = get_backend_requires_hook(name, dist, config_settings)
if dist in ("wheel", "editable"):
requires += read_build_requires("cython")
return requires
# ---
def get_requires_for_build_sdist(config_settings=None):
return get_requires_for_build("sdist", config_settings)
def build_sdist(
sdist_directory,
config_settings=None,
):
return build_backend().build_sdist(
sdist_directory,
config_settings,
)
# ---
def get_requires_for_build_wheel(config_settings=None):
return get_requires_for_build("wheel", config_settings)
def prepare_metadata_for_build_wheel(
metadata_directory,
config_settings=None,
):
return build_backend().prepare_metadata_for_build_wheel(
metadata_directory,
config_settings,
)
def build_wheel(
wheel_directory,
config_settings=None,
metadata_directory=None,
):
return build_backend().build_wheel(
wheel_directory,
config_settings,
metadata_directory,
)
# ---
def get_requires_for_build_editable(config_settings=None):
return get_requires_for_build("editable", config_settings)
def prepare_metadata_for_build_editable(
metadata_directory,
config_settings=None,
):
return build_backend().prepare_metadata_for_build_editable(
metadata_directory,
config_settings,
)
def build_editable(
wheel_directory,
config_settings=None,
metadata_directory=None,
):
return build_backend().build_editable(
wheel_directory,
config_settings,
metadata_directory,
)
# ---
def setup_env_mpicc():
mpicc = shutil.which("mpicc")
mpicc = os.environ.get("MPICC", mpicc)
mpicc = os.environ.get("MPI4PY_BUILD_MPICC", mpicc)
if not mpicc:
return
if " " in mpicc:
mpicc = f'"{mpicc}"'
if "CC" not in os.environ:
os.environ["CC"] = mpicc
if get_build_backend_name() == "setuptools":
try:
import setuptools.build_meta as st_bm
except ImportError:
st_bm = None
if not hasattr(st_bm, "get_requires_for_build_editable"):
del get_requires_for_build_editable
if not hasattr(st_bm, "prepare_metadata_for_build_editable"):
del prepare_metadata_for_build_editable
if not hasattr(st_bm, "build_editable"):
del build_editable
del st_bm
if get_build_backend_name() == "mesonpy":
setup_env_mpicc()
del prepare_metadata_for_build_wheel
del prepare_metadata_for_build_editable
# ---
|
