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