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Editing: req_tracker.py

import contextlib
import hashlib
import logging
import os
from types import TracebackType
from typing import Dict, Iterator, Optional, Set, Type, Union

from pip._internal.models.link import Link
from pip._internal.req.req_install import InstallRequirement
from pip._internal.utils.temp_dir import TempDirectory

logger = logging.getLogger(__name__)

@contextlib.contextmanager
def update_env_context_manager(**changes: str) -> Iterator[None]:
    target = os.environ

# Save values from the target and change them.
    non_existent_marker = object()
    saved_values: Dict[str, Union[object, str]] = {}
    for name, new_value in changes.items():
        try:
            saved_values[name] = target[name]
        except KeyError:
            saved_values[name] = non_existent_marker
        target[name] = new_value

try:
        yield
    finally:
        # Restore original values in the target.
        for name, original_value in saved_values.items():
            if original_value is non_existent_marker:
                del target[name]
            else:
                assert isinstance(original_value, str)  # for mypy
                target[name] = original_value

@contextlib.contextmanager
def get_requirement_tracker() -> Iterator["RequirementTracker"]:
    root = os.environ.get("PIP_REQ_TRACKER")
    with contextlib.ExitStack() as ctx:
        if root is None:
            root = ctx.enter_context(TempDirectory(kind="req-tracker")).path
            ctx.enter_context(update_env_context_manager(PIP_REQ_TRACKER=root))
            logger.debug("Initialized build tracking at %s", root)

with RequirementTracker(root) as tracker:
            yield tracker

class RequirementTracker:
    def __init__(self, root: str) -> None:
        self._root = root
        self._entries: Set[InstallRequirement] = set()
        logger.debug("Created build tracker: %s", self._root)

def __enter__(self) -> "RequirementTracker":
        logger.debug("Entered build tracker: %s", self._root)
        return self

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

def _entry_path(self, link: Link) -> str:
        hashed = hashlib.sha224(link.url_without_fragment.encode()).hexdigest()
        return os.path.join(self._root, hashed)

def add(self, req: InstallRequirement) -> None:
        """Add an InstallRequirement to build tracking."""

assert req.link
        # Get the file to write information about this requirement.
        entry_path = self._entry_path(req.link)

# Try reading from the file. If it exists and can be read from, a build
        # is already in progress, so a LookupError is raised.
        try:
            with open(entry_path) as fp:
                contents = fp.read()
        except FileNotFoundError:
            pass
        else:
            message = "{} is already being built: {}".format(req.link, contents)
            raise LookupError(message)

# If we're here, req should really not be building already.
        assert req not in self._entries

# Start tracking this requirement.
        with open(entry_path, "w", encoding="utf-8") as fp:
            fp.write(str(req))
        self._entries.add(req)

logger.debug("Added %s to build tracker %r", req, self._root)

def remove(self, req: InstallRequirement) -> None:
        """Remove an InstallRequirement from build tracking."""

assert req.link
        # Delete the created file and the corresponding entries.
        os.unlink(self._entry_path(req.link))
        self._entries.remove(req)

logger.debug("Removed %s from build tracker %r", req, self._root)

def cleanup(self) -> None:
        for req in set(self._entries):
            self.remove(req)

logger.debug("Removed build tracker: %r", self._root)

@contextlib.contextmanager
    def track(self, req: InstallRequirement) -> Iterator[None]:
        self.add(req)
        yield
        self.remove(req)

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