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"""Build wheels/sdists by installing build deps to a temporary environment.
"""
import os
import logging
from pip._vendor import pytoml
import shutil
from subprocess import check_call
import sys
from sysconfig import get_paths
from tempfile import mkdtemp
from .wrappers import Pep517HookCaller
log = logging.getLogger(__name__)
def _load_pyproject(source_dir):
with open(os.path.join(source_dir, 'pyproject.toml')) as f:
pyproject_data = pytoml.load(f)
buildsys = pyproject_data['build-system']
return buildsys['requires'], buildsys['build-backend']
class BuildEnvironment(object):
"""Context manager to install build deps in a simple temporary environment
Based on code I wrote for pip, which is MIT licensed.
"""
# Copyright (c) 2008-2016 The pip developers (see AUTHORS.txt file)
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
path = None
def __init__(self, cleanup=True):
self._cleanup = cleanup
def __enter__(self):
self.path = mkdtemp(prefix='pep517-build-env-')
log.info('Temporary build environment: %s', self.path)
self.save_path = os.environ.get('PATH', None)
self.save_pythonpath = os.environ.get('PYTHONPATH', None)
install_scheme = 'nt' if (os.name == 'nt') else 'posix_prefix'
install_dirs = get_paths(install_scheme, vars={
'base': self.path,
'platbase': self.path,
})
scripts = install_dirs['scripts']
if self.save_path:
os.environ['PATH'] = scripts + os.pathsep + self.save_path
else:
os.environ['PATH'] = scripts + os.pathsep + os.defpath
if install_dirs['purelib'] == install_dirs['platlib']:
lib_dirs = install_dirs['purelib']
else:
lib_dirs = install_dirs['purelib'] + os.pathsep + \
install_dirs['platlib']
if self.save_pythonpath:
os.environ['PYTHONPATH'] = lib_dirs + os.pathsep + \
self.save_pythonpath
else:
os.environ['PYTHONPATH'] = lib_dirs
return self
def pip_install(self, reqs):
"""Install dependencies into this env by calling pip in a subprocess"""
if not reqs:
return
log.info('Calling pip to install %s', reqs)
check_call([
sys.executable, '-m', 'pip', 'install', '--ignore-installed',
'--prefix', self.path] + list(reqs))
def __exit__(self, exc_type, exc_val, exc_tb):
needs_cleanup = (
self._cleanup and
self.path is not None and
os.path.isdir(self.path)
)
if needs_cleanup:
shutil.rmtree(self.path)
if self.save_path is None:
os.environ.pop('PATH', None)
else:
os.environ['PATH'] = self.save_path
if self.save_pythonpath is None:
os.environ.pop('PYTHONPATH', None)
else:
os.environ['PYTHONPATH'] = self.save_pythonpath
def build_wheel(source_dir, wheel_dir, config_settings=None):
"""Build a wheel from a source directory using PEP 517 hooks.
:param str source_dir: Source directory containing pyproject.toml
:param str wheel_dir: Target directory to create wheel in
:param dict config_settings: Options to pass to build backend
This is a blocking function which will run pip in a subprocess to install
build requirements.
"""
if config_settings is None:
config_settings = {}
requires, backend = _load_pyproject(source_dir)
hooks = Pep517HookCaller(source_dir, backend)
with BuildEnvironment() as env:
env.pip_install(requires)
reqs = hooks.get_requires_for_build_wheel(config_settings)
env.pip_install(reqs)
return hooks.build_wheel(wheel_dir, config_settings)
def build_sdist(source_dir, sdist_dir, config_settings=None):
"""Build an sdist from a source directory using PEP 517 hooks.
:param str source_dir: Source directory containing pyproject.toml
:param str sdist_dir: Target directory to place sdist in
:param dict config_settings: Options to pass to build backend
This is a blocking function which will run pip in a subprocess to install
build requirements.
"""
if config_settings is None:
config_settings = {}
requires, backend = _load_pyproject(source_dir)
hooks = Pep517HookCaller(source_dir, backend)
with BuildEnvironment() as env:
env.pip_install(requires)
reqs = hooks.get_requires_for_build_sdist(config_settings)
env.pip_install(reqs)
return hooks.build_sdist(sdist_dir, config_settings)
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