125 lines
4.0 KiB
Python
125 lines
4.0 KiB
Python
import contextlib
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import hashlib
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import logging
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import os
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from types import TracebackType
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from typing import Dict, Iterator, Optional, Set, Type, Union
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from pip._internal.models.link import Link
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from pip._internal.req.req_install import InstallRequirement
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from pip._internal.utils.temp_dir import TempDirectory
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logger = logging.getLogger(__name__)
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@contextlib.contextmanager
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def update_env_context_manager(**changes: str) -> Iterator[None]:
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target = os.environ
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# Save values from the target and change them.
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non_existent_marker = object()
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saved_values: Dict[str, Union[object, str]] = {}
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for name, new_value in changes.items():
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try:
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saved_values[name] = target[name]
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except KeyError:
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saved_values[name] = non_existent_marker
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target[name] = new_value
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try:
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yield
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finally:
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# Restore original values in the target.
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for name, original_value in saved_values.items():
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if original_value is non_existent_marker:
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del target[name]
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else:
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assert isinstance(original_value, str) # for mypy
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target[name] = original_value
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@contextlib.contextmanager
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def get_requirement_tracker() -> Iterator["RequirementTracker"]:
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root = os.environ.get("PIP_REQ_TRACKER")
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with contextlib.ExitStack() as ctx:
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if root is None:
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root = ctx.enter_context(TempDirectory(kind="req-tracker")).path
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ctx.enter_context(update_env_context_manager(PIP_REQ_TRACKER=root))
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logger.debug("Initialized build tracking at %s", root)
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with RequirementTracker(root) as tracker:
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yield tracker
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class RequirementTracker:
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def __init__(self, root: str) -> None:
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self._root = root
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self._entries: Set[InstallRequirement] = set()
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logger.debug("Created build tracker: %s", self._root)
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def __enter__(self) -> "RequirementTracker":
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logger.debug("Entered build tracker: %s", self._root)
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return self
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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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self.cleanup()
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def _entry_path(self, link: Link) -> str:
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hashed = hashlib.sha224(link.url_without_fragment.encode()).hexdigest()
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return os.path.join(self._root, hashed)
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def add(self, req: InstallRequirement) -> None:
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"""Add an InstallRequirement to build tracking."""
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assert req.link
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# Get the file to write information about this requirement.
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entry_path = self._entry_path(req.link)
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# Try reading from the file. If it exists and can be read from, a build
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# is already in progress, so a LookupError is raised.
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try:
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with open(entry_path) as fp:
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contents = fp.read()
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except FileNotFoundError:
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pass
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else:
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message = "{} is already being built: {}".format(req.link, contents)
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raise LookupError(message)
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# If we're here, req should really not be building already.
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assert req not in self._entries
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# Start tracking this requirement.
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with open(entry_path, "w", encoding="utf-8") as fp:
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fp.write(str(req))
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self._entries.add(req)
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logger.debug("Added %s to build tracker %r", req, self._root)
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def remove(self, req: InstallRequirement) -> None:
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"""Remove an InstallRequirement from build tracking."""
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assert req.link
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# Delete the created file and the corresponding entries.
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os.unlink(self._entry_path(req.link))
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self._entries.remove(req)
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logger.debug("Removed %s from build tracker %r", req, self._root)
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def cleanup(self) -> None:
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for req in set(self._entries):
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self.remove(req)
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logger.debug("Removed build tracker: %r", self._root)
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@contextlib.contextmanager
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def track(self, req: InstallRequirement) -> Iterator[None]:
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self.add(req)
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yield
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self.remove(req)
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