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| 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__) | |
| 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 | |
| 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) | |
| def track(self, req: InstallRequirement) -> Iterator[None]: | |
| self.add(req) | |
| yield | |
| self.remove(req) | |