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219 lines
7.2 KiB
Python
219 lines
7.2 KiB
Python
"""Build Environment used for isolation during sdist building
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"""
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import logging
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import os
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import sys
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import textwrap
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from collections import OrderedDict
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from distutils.sysconfig import get_python_lib
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from sysconfig import get_paths
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from pip._vendor.pkg_resources import Requirement, VersionConflict, WorkingSet
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from pip import __file__ as pip_location
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from pip._internal.utils.misc import call_subprocess
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from pip._internal.utils.temp_dir import TempDirectory
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from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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from pip._internal.utils.ui import open_spinner
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if MYPY_CHECK_RUNNING:
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from typing import Tuple, Set, Iterable, Optional, List
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from pip._internal.index import PackageFinder
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logger = logging.getLogger(__name__)
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class _Prefix:
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def __init__(self, path):
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# type: (str) -> None
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self.path = path
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self.setup = False
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self.bin_dir = get_paths(
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'nt' if os.name == 'nt' else 'posix_prefix',
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vars={'base': path, 'platbase': path}
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)['scripts']
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# Note: prefer distutils' sysconfig to get the
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# library paths so PyPy is correctly supported.
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purelib = get_python_lib(plat_specific=False, prefix=path)
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platlib = get_python_lib(plat_specific=True, prefix=path)
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if purelib == platlib:
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self.lib_dirs = [purelib]
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else:
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self.lib_dirs = [purelib, platlib]
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class BuildEnvironment(object):
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"""Creates and manages an isolated environment to install build deps
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"""
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def __init__(self):
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# type: () -> None
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self._temp_dir = TempDirectory(kind="build-env")
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self._temp_dir.create()
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self._prefixes = OrderedDict((
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(name, _Prefix(os.path.join(self._temp_dir.path, name)))
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for name in ('normal', 'overlay')
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))
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self._bin_dirs = [] # type: List[str]
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self._lib_dirs = [] # type: List[str]
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for prefix in reversed(list(self._prefixes.values())):
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self._bin_dirs.append(prefix.bin_dir)
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self._lib_dirs.extend(prefix.lib_dirs)
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# Customize site to:
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# - ensure .pth files are honored
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# - prevent access to system site packages
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system_sites = {
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os.path.normcase(site) for site in (
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get_python_lib(plat_specific=False),
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get_python_lib(plat_specific=True),
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)
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}
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self._site_dir = os.path.join(self._temp_dir.path, 'site')
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if not os.path.exists(self._site_dir):
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os.mkdir(self._site_dir)
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with open(os.path.join(self._site_dir, 'sitecustomize.py'), 'w') as fp:
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fp.write(textwrap.dedent(
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'''
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import os, site, sys
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# First, drop system-sites related paths.
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original_sys_path = sys.path[:]
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known_paths = set()
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for path in {system_sites!r}:
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site.addsitedir(path, known_paths=known_paths)
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system_paths = set(
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os.path.normcase(path)
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for path in sys.path[len(original_sys_path):]
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)
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original_sys_path = [
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path for path in original_sys_path
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if os.path.normcase(path) not in system_paths
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]
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sys.path = original_sys_path
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# Second, add lib directories.
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# ensuring .pth file are processed.
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for path in {lib_dirs!r}:
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assert not path in sys.path
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site.addsitedir(path)
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'''
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).format(system_sites=system_sites, lib_dirs=self._lib_dirs))
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def __enter__(self):
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self._save_env = {
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name: os.environ.get(name, None)
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for name in ('PATH', 'PYTHONNOUSERSITE', 'PYTHONPATH')
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}
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path = self._bin_dirs[:]
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old_path = self._save_env['PATH']
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if old_path:
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path.extend(old_path.split(os.pathsep))
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pythonpath = [self._site_dir]
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os.environ.update({
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'PATH': os.pathsep.join(path),
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'PYTHONNOUSERSITE': '1',
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'PYTHONPATH': os.pathsep.join(pythonpath),
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})
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def __exit__(self, exc_type, exc_val, exc_tb):
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for varname, old_value in self._save_env.items():
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if old_value is None:
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os.environ.pop(varname, None)
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else:
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os.environ[varname] = old_value
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def cleanup(self):
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# type: () -> None
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self._temp_dir.cleanup()
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def check_requirements(self, reqs):
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# type: (Iterable[str]) -> Tuple[Set[Tuple[str, str]], Set[str]]
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"""Return 2 sets:
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- conflicting requirements: set of (installed, wanted) reqs tuples
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- missing requirements: set of reqs
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"""
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missing = set()
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conflicting = set()
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if reqs:
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ws = WorkingSet(self._lib_dirs)
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for req in reqs:
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try:
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if ws.find(Requirement.parse(req)) is None:
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missing.add(req)
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except VersionConflict as e:
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conflicting.add((str(e.args[0].as_requirement()),
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str(e.args[1])))
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return conflicting, missing
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def install_requirements(
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self,
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finder, # type: PackageFinder
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requirements, # type: Iterable[str]
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prefix_as_string, # type: str
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message # type: Optional[str]
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):
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# type: (...) -> None
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prefix = self._prefixes[prefix_as_string]
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assert not prefix.setup
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prefix.setup = True
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if not requirements:
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return
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args = [
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sys.executable, os.path.dirname(pip_location), 'install',
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'--ignore-installed', '--no-user', '--prefix', prefix.path,
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'--no-warn-script-location',
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] # type: List[str]
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if logger.getEffectiveLevel() <= logging.DEBUG:
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args.append('-v')
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for format_control in ('no_binary', 'only_binary'):
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formats = getattr(finder.format_control, format_control)
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args.extend(('--' + format_control.replace('_', '-'),
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','.join(sorted(formats or {':none:'}))))
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index_urls = finder.index_urls
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if index_urls:
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args.extend(['-i', index_urls[0]])
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for extra_index in index_urls[1:]:
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args.extend(['--extra-index-url', extra_index])
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else:
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args.append('--no-index')
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for link in finder.find_links:
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args.extend(['--find-links', link])
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for host in finder.trusted_hosts:
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args.extend(['--trusted-host', host])
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if finder.allow_all_prereleases:
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args.append('--pre')
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args.append('--')
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args.extend(requirements)
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with open_spinner(message) as spinner:
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call_subprocess(args, spinner=spinner)
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class NoOpBuildEnvironment(BuildEnvironment):
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"""A no-op drop-in replacement for BuildEnvironment
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"""
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def __init__(self):
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pass
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def __enter__(self):
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pass
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def __exit__(self, exc_type, exc_val, exc_tb):
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pass
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def cleanup(self):
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pass
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def install_requirements(self, finder, requirements, prefix, message):
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raise NotImplementedError()
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