247 lines
7.5 KiB
Python
247 lines
7.5 KiB
Python
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import errno
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import itertools
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import logging
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import os.path
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import tempfile
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from contextlib import ExitStack, contextmanager
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from typing import Any, Dict, Generator, Optional, TypeVar, Union
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from pip._internal.utils.misc import enum, rmtree
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logger = logging.getLogger(__name__)
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_T = TypeVar("_T", bound="TempDirectory")
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# Kinds of temporary directories. Only needed for ones that are
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# globally-managed.
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tempdir_kinds = enum(
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BUILD_ENV="build-env",
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EPHEM_WHEEL_CACHE="ephem-wheel-cache",
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REQ_BUILD="req-build",
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)
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_tempdir_manager: Optional[ExitStack] = None
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@contextmanager
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def global_tempdir_manager() -> Generator[None, None, None]:
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global _tempdir_manager
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with ExitStack() as stack:
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old_tempdir_manager, _tempdir_manager = _tempdir_manager, stack
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try:
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yield
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finally:
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_tempdir_manager = old_tempdir_manager
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class TempDirectoryTypeRegistry:
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"""Manages temp directory behavior"""
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def __init__(self) -> None:
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self._should_delete: Dict[str, bool] = {}
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def set_delete(self, kind: str, value: bool) -> None:
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"""Indicate whether a TempDirectory of the given kind should be
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auto-deleted.
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"""
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self._should_delete[kind] = value
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def get_delete(self, kind: str) -> bool:
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"""Get configured auto-delete flag for a given TempDirectory type,
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default True.
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"""
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return self._should_delete.get(kind, True)
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_tempdir_registry: Optional[TempDirectoryTypeRegistry] = None
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@contextmanager
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def tempdir_registry() -> Generator[TempDirectoryTypeRegistry, None, None]:
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"""Provides a scoped global tempdir registry that can be used to dictate
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whether directories should be deleted.
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"""
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global _tempdir_registry
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old_tempdir_registry = _tempdir_registry
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_tempdir_registry = TempDirectoryTypeRegistry()
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try:
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yield _tempdir_registry
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finally:
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_tempdir_registry = old_tempdir_registry
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class _Default:
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pass
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_default = _Default()
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class TempDirectory:
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"""Helper class that owns and cleans up a temporary directory.
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This class can be used as a context manager or as an OO representation of a
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temporary directory.
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Attributes:
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path
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Location to the created temporary directory
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delete
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Whether the directory should be deleted when exiting
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(when used as a contextmanager)
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Methods:
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cleanup()
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Deletes the temporary directory
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When used as a context manager, if the delete attribute is True, on
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exiting the context the temporary directory is deleted.
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"""
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def __init__(
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self,
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path: Optional[str] = None,
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delete: Union[bool, None, _Default] = _default,
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kind: str = "temp",
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globally_managed: bool = False,
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):
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super().__init__()
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if delete is _default:
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if path is not None:
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# If we were given an explicit directory, resolve delete option
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# now.
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delete = False
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else:
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# Otherwise, we wait until cleanup and see what
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# tempdir_registry says.
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delete = None
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# The only time we specify path is in for editables where it
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# is the value of the --src option.
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if path is None:
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path = self._create(kind)
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self._path = path
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self._deleted = False
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self.delete = delete
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self.kind = kind
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if globally_managed:
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assert _tempdir_manager is not None
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_tempdir_manager.enter_context(self)
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@property
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def path(self) -> str:
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assert not self._deleted, f"Attempted to access deleted path: {self._path}"
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return self._path
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def __repr__(self) -> str:
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return f"<{self.__class__.__name__} {self.path!r}>"
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def __enter__(self: _T) -> _T:
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return self
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def __exit__(self, exc: Any, value: Any, tb: Any) -> None:
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if self.delete is not None:
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delete = self.delete
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elif _tempdir_registry:
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delete = _tempdir_registry.get_delete(self.kind)
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else:
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delete = True
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if delete:
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self.cleanup()
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def _create(self, kind: str) -> str:
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"""Create a temporary directory and store its path in self.path"""
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# We realpath here because some systems have their default tmpdir
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# symlinked to another directory. This tends to confuse build
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# scripts, so we canonicalize the path by traversing potential
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# symlinks here.
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path = os.path.realpath(tempfile.mkdtemp(prefix=f"pip-{kind}-"))
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logger.debug("Created temporary directory: %s", path)
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return path
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def cleanup(self) -> None:
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"""Remove the temporary directory created and reset state"""
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self._deleted = True
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if not os.path.exists(self._path):
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return
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rmtree(self._path)
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class AdjacentTempDirectory(TempDirectory):
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"""Helper class that creates a temporary directory adjacent to a real one.
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Attributes:
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original
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The original directory to create a temp directory for.
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path
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After calling create() or entering, contains the full
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path to the temporary directory.
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delete
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Whether the directory should be deleted when exiting
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(when used as a contextmanager)
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"""
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# The characters that may be used to name the temp directory
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# We always prepend a ~ and then rotate through these until
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# a usable name is found.
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# pkg_resources raises a different error for .dist-info folder
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# with leading '-' and invalid metadata
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LEADING_CHARS = "-~.=%0123456789"
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def __init__(self, original: str, delete: Optional[bool] = None) -> None:
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self.original = original.rstrip("/\\")
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super().__init__(delete=delete)
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@classmethod
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def _generate_names(cls, name: str) -> Generator[str, None, None]:
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"""Generates a series of temporary names.
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The algorithm replaces the leading characters in the name
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with ones that are valid filesystem characters, but are not
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valid package names (for both Python and pip definitions of
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package).
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"""
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for i in range(1, len(name)):
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for candidate in itertools.combinations_with_replacement(
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cls.LEADING_CHARS, i - 1
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):
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new_name = "~" + "".join(candidate) + name[i:]
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if new_name != name:
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yield new_name
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# If we make it this far, we will have to make a longer name
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for i in range(len(cls.LEADING_CHARS)):
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for candidate in itertools.combinations_with_replacement(
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cls.LEADING_CHARS, i
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):
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new_name = "~" + "".join(candidate) + name
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if new_name != name:
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yield new_name
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def _create(self, kind: str) -> str:
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root, name = os.path.split(self.original)
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for candidate in self._generate_names(name):
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path = os.path.join(root, candidate)
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try:
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os.mkdir(path)
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except OSError as ex:
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# Continue if the name exists already
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if ex.errno != errno.EEXIST:
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raise
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else:
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path = os.path.realpath(path)
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break
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else:
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# Final fallback on the default behavior.
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path = os.path.realpath(tempfile.mkdtemp(prefix=f"pip-{kind}-"))
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logger.debug("Created temporary directory: %s", path)
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return path
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