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125 lines
3.3 KiB
Python
125 lines
3.3 KiB
Python
5 years ago
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"""Build a project using PEP 517 hooks.
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"""
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import argparse
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import logging
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import os
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from pip._vendor import toml
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import shutil
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from .envbuild import BuildEnvironment
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from .wrappers import Pep517HookCaller
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from .dirtools import tempdir, mkdir_p
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from .compat import FileNotFoundError
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log = logging.getLogger(__name__)
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def validate_system(system):
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"""
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Ensure build system has the requisite fields.
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"""
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required = {'requires', 'build-backend'}
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if not (required <= set(system)):
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message = "Missing required fields: {missing}".format(
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missing=required-set(system),
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)
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raise ValueError(message)
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def load_system(source_dir):
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"""
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Load the build system from a source dir (pyproject.toml).
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"""
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pyproject = os.path.join(source_dir, 'pyproject.toml')
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with open(pyproject) as f:
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pyproject_data = toml.load(f)
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return pyproject_data['build-system']
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def compat_system(source_dir):
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"""
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Given a source dir, attempt to get a build system backend
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and requirements from pyproject.toml. Fallback to
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setuptools but only if the file was not found or a build
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system was not indicated.
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"""
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try:
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system = load_system(source_dir)
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except (FileNotFoundError, KeyError):
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system = {}
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system.setdefault(
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'build-backend',
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'setuptools.build_meta:__legacy__',
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)
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system.setdefault('requires', ['setuptools', 'wheel'])
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return system
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def _do_build(hooks, env, dist, dest):
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get_requires_name = 'get_requires_for_build_{dist}'.format(**locals())
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get_requires = getattr(hooks, get_requires_name)
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reqs = get_requires({})
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log.info('Got build requires: %s', reqs)
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env.pip_install(reqs)
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log.info('Installed dynamic build dependencies')
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with tempdir() as td:
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log.info('Trying to build %s in %s', dist, td)
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build_name = 'build_{dist}'.format(**locals())
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build = getattr(hooks, build_name)
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filename = build(td, {})
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source = os.path.join(td, filename)
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shutil.move(source, os.path.join(dest, os.path.basename(filename)))
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def build(source_dir, dist, dest=None, system=None):
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system = system or load_system(source_dir)
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dest = os.path.join(source_dir, dest or 'dist')
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mkdir_p(dest)
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validate_system(system)
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hooks = Pep517HookCaller(
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source_dir, system['build-backend'], system.get('backend-path')
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)
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with BuildEnvironment() as env:
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env.pip_install(system['requires'])
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_do_build(hooks, env, dist, dest)
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parser = argparse.ArgumentParser()
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parser.add_argument(
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'source_dir',
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help="A directory containing pyproject.toml",
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)
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parser.add_argument(
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'--binary', '-b',
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action='store_true',
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default=False,
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)
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parser.add_argument(
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'--source', '-s',
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action='store_true',
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default=False,
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)
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parser.add_argument(
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'--out-dir', '-o',
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help="Destination in which to save the builds relative to source dir",
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)
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def main(args):
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# determine which dists to build
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dists = list(filter(None, (
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'sdist' if args.source or not args.binary else None,
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'wheel' if args.binary or not args.source else None,
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)))
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for dist in dists:
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build(args.source_dir, dist, args.out_dir)
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if __name__ == '__main__':
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main(parser.parse_args())
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