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Current File : /opt/alt/python38/lib/python3.8/site-packages/pip/_internal/build_env.py
"""Build Environment used for isolation during sdist building
"""

import logging
import os
import pathlib
import sys
import textwrap
from collections import OrderedDict
from sysconfig import get_paths
from types import TracebackType
from typing import TYPE_CHECKING, Iterable, List, Optional, Set, Tuple, Type

from pip._vendor.certifi import where
from pip._vendor.packaging.requirements import Requirement
from pip._vendor.packaging.version import Version

from pip import __file__ as pip_location
from pip._internal.cli.spinners import open_spinner
from pip._internal.locations import get_platlib, get_prefixed_libs, get_purelib
from pip._internal.metadata import get_default_environment, get_environment
from pip._internal.utils.subprocess import call_subprocess
from pip._internal.utils.temp_dir import TempDirectory, tempdir_kinds

if TYPE_CHECKING:
    from pip._internal.index.package_finder import PackageFinder

logger = logging.getLogger(__name__)


class _Prefix:
    def __init__(self, path: 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"]
        self.lib_dirs = get_prefixed_libs(path)


def _get_runnable_pip() -> str:
    """Get a file to pass to a Python executable, to run the currently-running pip.

    This is used to run a pip subprocess, for installing requirements into the build
    environment.
    """
    source = pathlib.Path(pip_location).resolve().parent

    if not source.is_dir():
        # This would happen if someone is using pip from inside a zip file. In that
        # case, we can use that directly.
        return str(source)

    return os.fsdecode(source / "__pip-runner__.py")


class BuildEnvironment:
    """Creates and manages an isolated environment to install build deps"""

    def __init__(self) -> None:
        temp_dir = TempDirectory(kind=tempdir_kinds.BUILD_ENV, globally_managed=True)

        self._prefixes = OrderedDict(
            (name, _Prefix(os.path.join(temp_dir.path, name)))
            for name in ("normal", "overlay")
        )

        self._bin_dirs: List[str] = []
        self._lib_dirs: 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_purelib(), get_platlib())
        }
        self._site_dir = os.path.join(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", encoding="utf-8"
        ) 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) -> None:
        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: Optional[Type[BaseException]],
        exc_val: Optional[BaseException],
        exc_tb: Optional[TracebackType],
    ) -> None:
        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 check_requirements(
        self, reqs: 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:
            env = (
                get_environment(self._lib_dirs)
                if hasattr(self, "_lib_dirs")
                else get_default_environment()
            )
            for req_str in reqs:
                req = Requirement(req_str)
                # We're explicitly evaluating with an empty extra value, since build
                # environments are not provided any mechanism to select specific extras.
                if req.marker is not None and not req.marker.evaluate({"extra": ""}):
                    continue
                dist = env.get_distribution(req.name)
                if not dist:
                    missing.add(req_str)
                    continue
                if isinstance(dist.version, Version):
                    installed_req_str = f"{req.name}=={dist.version}"
                else:
                    installed_req_str = f"{req.name}==={dist.version}"
                if not req.specifier.contains(dist.version, prereleases=True):
                    conflicting.add((installed_req_str, req_str))
                # FIXME: Consider direct URL?
        return conflicting, missing

    def install_requirements(
        self,
        finder: "PackageFinder",
        requirements: Iterable[str],
        prefix_as_string: str,
        *,
        kind: str,
    ) -> None:
        prefix = self._prefixes[prefix_as_string]
        assert not prefix.setup
        prefix.setup = True
        if not requirements:
            return
        self._install_requirements(
            _get_runnable_pip(),
            finder,
            requirements,
            prefix,
            kind=kind,
        )

    @staticmethod
    def _install_requirements(
        pip_runnable: str,
        finder: "PackageFinder",
        requirements: Iterable[str],
        prefix: _Prefix,
        *,
        kind: str,
    ) -> None:
        args: List[str] = [
            sys.executable,
            pip_runnable,
            "install",
            "--ignore-installed",
            "--no-user",
            "--prefix",
            prefix.path,
            "--no-warn-script-location",
        ]
        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")
        if finder.prefer_binary:
            args.append("--prefer-binary")
        args.append("--")
        args.extend(requirements)
        extra_environ = {"_PIP_STANDALONE_CERT": where()}
        with open_spinner(f"Installing {kind}") as spinner:
            call_subprocess(
                args,
                command_desc=f"pip subprocess to install {kind}",
                spinner=spinner,
                extra_environ=extra_environ,
            )


class NoOpBuildEnvironment(BuildEnvironment):
    """A no-op drop-in replacement for BuildEnvironment"""

    def __init__(self) -> None:
        pass

    def __enter__(self) -> None:
        pass

    def __exit__(
        self,
        exc_type: Optional[Type[BaseException]],
        exc_val: Optional[BaseException],
        exc_tb: Optional[TracebackType],
    ) -> None:
        pass

    def cleanup(self) -> None:
        pass

    def install_requirements(
        self,
        finder: "PackageFinder",
        requirements: Iterable[str],
        prefix_as_string: str,
        *,
        kind: str,
    ) -> None:
        raise NotImplementedError()

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