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Code Editor : build_tracker.py
import contextlib import hashlib import logging import os from types import TracebackType from typing import Dict, Generator, Optional, Type, Union 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) -> Generator[None, None, 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_build_tracker() -> Generator["BuildTracker", None, None]: root = os.environ.get("PIP_BUILD_TRACKER") with contextlib.ExitStack() as ctx: if root is None: root = ctx.enter_context(TempDirectory(kind="build-tracker")).path ctx.enter_context(update_env_context_manager(PIP_BUILD_TRACKER=root)) logger.debug("Initialized build tracking at %s", root) with BuildTracker(root) as tracker: yield tracker class TrackerId(str): """Uniquely identifying string provided to the build tracker.""" class BuildTracker: """Ensure that an sdist cannot request itself as a setup requirement. When an sdist is prepared, it identifies its setup requirements in the context of ``BuildTracker.track()``. If a requirement shows up recursively, this raises an exception. This stops fork bombs embedded in malicious packages.""" def __init__(self, root: str) -> None: self._root = root self._entries: Dict[TrackerId, InstallRequirement] = {} logger.debug("Created build tracker: %s", self._root) def __enter__(self) -> "BuildTracker": 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, key: TrackerId) -> str: hashed = hashlib.sha224(key.encode()).hexdigest() return os.path.join(self._root, hashed) def add(self, req: InstallRequirement, key: TrackerId) -> None: """Add an InstallRequirement to build tracking.""" # Get the file to write information about this requirement. entry_path = self._entry_path(key) # 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 = f"{req.link} is already being built: {contents}" raise LookupError(message) # If we're here, req should really not be building already. assert key not in self._entries # Start tracking this requirement. with open(entry_path, "w", encoding="utf-8") as fp: fp.write(str(req)) self._entries[key] = req logger.debug("Added %s to build tracker %r", req, self._root) def remove(self, req: InstallRequirement, key: TrackerId) -> None: """Remove an InstallRequirement from build tracking.""" # Delete the created file and the corresponding entry. os.unlink(self._entry_path(key)) del self._entries[key] logger.debug("Removed %s from build tracker %r", req, self._root) def cleanup(self) -> None: for key, req in list(self._entries.items()): self.remove(req, key) logger.debug("Removed build tracker: %r", self._root) @contextlib.contextmanager def track(self, req: InstallRequirement, key: str) -> Generator[None, None, None]: """Ensure that `key` cannot install itself as a setup requirement. :raises LookupError: If `key` was already provided in a parent invocation of the context introduced by this method.""" tracker_id = TrackerId(key) self.add(req, tracker_id) yield self.remove(req, tracker_id)
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