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297 lines
9.5 KiB
297 lines
9.5 KiB
3 years ago
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"""Build Environment used for isolation during sdist building
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"""
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import contextlib
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import logging
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import os
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import pathlib
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import sys
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import textwrap
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import zipfile
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from collections import OrderedDict
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from sysconfig import get_paths
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from types import TracebackType
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from typing import TYPE_CHECKING, Iterable, Iterator, List, Optional, Set, Tuple, Type
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from pip._vendor.certifi import where
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from pip._vendor.packaging.requirements import Requirement
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from pip._vendor.packaging.version import Version
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from pip import __file__ as pip_location
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from pip._internal.cli.spinners import open_spinner
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from pip._internal.locations import get_platlib, get_prefixed_libs, get_purelib
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from pip._internal.metadata import get_environment
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from pip._internal.utils.subprocess import call_subprocess
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from pip._internal.utils.temp_dir import TempDirectory, tempdir_kinds
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if TYPE_CHECKING:
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from pip._internal.index.package_finder import PackageFinder
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logger = logging.getLogger(__name__)
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class _Prefix:
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def __init__(self, path: 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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self.lib_dirs = get_prefixed_libs(path)
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@contextlib.contextmanager
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def _create_standalone_pip() -> Iterator[str]:
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"""Create a "standalone pip" zip file.
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The zip file's content is identical to the currently-running pip.
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It will be used to install requirements into the build environment.
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"""
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source = pathlib.Path(pip_location).resolve().parent
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# Return the current instance if `source` is not a directory. We can't build
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# a zip from this, and it likely means the instance is already standalone.
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if not source.is_dir():
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yield str(source)
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return
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with TempDirectory(kind="standalone-pip") as tmp_dir:
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pip_zip = os.path.join(tmp_dir.path, "__env_pip__.zip")
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kwargs = {}
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if sys.version_info >= (3, 8):
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kwargs["strict_timestamps"] = False
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with zipfile.ZipFile(pip_zip, "w", **kwargs) as zf:
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for child in source.rglob("*"):
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zf.write(child, child.relative_to(source.parent).as_posix())
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yield os.path.join(pip_zip, "pip")
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class BuildEnvironment:
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"""Creates and manages an isolated environment to install build deps"""
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def __init__(self) -> None:
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temp_dir = TempDirectory(kind=tempdir_kinds.BUILD_ENV, globally_managed=True)
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self._prefixes = OrderedDict(
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(name, _Prefix(os.path.join(temp_dir.path, name)))
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for name in ("normal", "overlay")
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)
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self._bin_dirs: List[str] = []
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self._lib_dirs: 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 (get_purelib(), get_platlib())
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}
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self._site_dir = os.path.join(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(
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os.path.join(self._site_dir, "sitecustomize.py"), "w", encoding="utf-8"
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) as fp:
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fp.write(
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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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)
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def __enter__(self) -> None:
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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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{
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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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)
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def __exit__(
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self,
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exc_type: Optional[Type[BaseException]],
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exc_val: Optional[BaseException],
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exc_tb: Optional[TracebackType],
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) -> None:
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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 check_requirements(
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self, reqs: Iterable[str]
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) -> 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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env = get_environment(self._lib_dirs)
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for req_str in reqs:
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req = Requirement(req_str)
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dist = env.get_distribution(req.name)
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if not dist:
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missing.add(req_str)
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continue
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if isinstance(dist.version, Version):
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installed_req_str = f"{req.name}=={dist.version}"
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else:
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installed_req_str = f"{req.name}==={dist.version}"
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if dist.version not in req.specifier:
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conflicting.add((installed_req_str, req_str))
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# FIXME: Consider direct URL?
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return conflicting, missing
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def install_requirements(
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self,
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finder: "PackageFinder",
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requirements: Iterable[str],
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prefix_as_string: str,
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*,
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kind: str,
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) -> 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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with contextlib.ExitStack() as ctx:
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pip_runnable = ctx.enter_context(_create_standalone_pip())
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self._install_requirements(
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pip_runnable,
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finder,
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requirements,
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prefix,
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kind=kind,
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)
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@staticmethod
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def _install_requirements(
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pip_runnable: str,
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finder: "PackageFinder",
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requirements: Iterable[str],
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prefix: _Prefix,
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*,
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kind: str,
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) -> None:
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args: List[str] = [
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sys.executable,
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pip_runnable,
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"install",
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"--ignore-installed",
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"--no-user",
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"--prefix",
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prefix.path,
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"--no-warn-script-location",
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]
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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(
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(
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"--" + format_control.replace("_", "-"),
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",".join(sorted(formats or {":none:"})),
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)
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)
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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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if finder.prefer_binary:
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args.append("--prefer-binary")
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args.append("--")
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args.extend(requirements)
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extra_environ = {"_PIP_STANDALONE_CERT": where()}
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with open_spinner(f"Installing {kind}") as spinner:
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call_subprocess(
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args,
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command_desc=f"pip subprocess to install {kind}",
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spinner=spinner,
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extra_environ=extra_environ,
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)
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class NoOpBuildEnvironment(BuildEnvironment):
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"""A no-op drop-in replacement for BuildEnvironment"""
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def __init__(self) -> None:
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pass
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def __enter__(self) -> None:
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pass
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def __exit__(
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self,
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exc_type: Optional[Type[BaseException]],
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exc_val: Optional[BaseException],
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exc_tb: Optional[TracebackType],
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) -> None:
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pass
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def cleanup(self) -> None:
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pass
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def install_requirements(
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self,
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finder: "PackageFinder",
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requirements: Iterable[str],
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prefix_as_string: str,
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*,
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kind: str,
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) -> None:
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raise NotImplementedError()
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