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# The following comment should be removed at some point in the future. # mypy: disallow-untyped-defs=False from __future__ import absolute_import import errno import itertools import logging import os.path import tempfile from pip._internal.utils.misc import rmtree from pip._internal.utils.typing import MYPY_CHECK_RUNNING if MYPY_CHECK_RUNNING: from typing import Optional logger = logging.getLogger(__name__) class TempDirectory(object): """Helper class that owns and cleans up a temporary directory. This class can be used as a context manager or as an OO representation of a temporary directory. Attributes: path Location to the created temporary directory delete Whether the directory should be deleted when exiting (when used as a contextmanager) Methods: cleanup() Deletes the temporary directory When used as a context manager, if the delete attribute is True, on exiting the context the temporary directory is deleted. """ def __init__( self, path=None, # type: Optional[str] delete=None, # type: Optional[bool] kind="temp" ): super(TempDirectory, self).__init__() if path is None and delete is None: # If we were not given an explicit directory, and we were not given # an explicit delete option, then we'll default to deleting. delete = True if path is None: path = self._create(kind) self._path = path self._deleted = False self.delete = delete self.kind = kind @property def path(self): # type: () -> str assert not self._deleted, ( "Attempted to access deleted path: {}".format(self._path) ) return self._path def __repr__(self): return "<{} {!r}>".format(self.__class__.__name__, self.path) def __enter__(self): return self def __exit__(self, exc, value, tb): if self.delete: self.cleanup() def _create(self, kind): """Create a temporary directory and store its path in self.path """ # We realpath here because some systems have their default tmpdir # symlinked to another directory. This tends to confuse build # scripts, so we canonicalize the path by traversing potential # symlinks here. path = os.path.realpath( tempfile.mkdtemp(prefix="pip-{}-".format(kind)) ) logger.debug("Created temporary directory: {}".format(path)) return path def cleanup(self): """Remove the temporary directory created and reset state """ self._deleted = True if os.path.exists(self._path): rmtree(self._path) class AdjacentTempDirectory(TempDirectory): """Helper class that creates a temporary directory adjacent to a real one. Attributes: original The original directory to create a temp directory for. path After calling create() or entering, contains the full path to the temporary directory. delete Whether the directory should be deleted when exiting (when used as a contextmanager) """ # The characters that may be used to name the temp directory # We always prepend a ~ and then rotate through these until # a usable name is found. # pkg_resources raises a different error for .dist-info folder # with leading '-' and invalid metadata LEADING_CHARS = "-~.=%0123456789" def __init__(self, original, delete=None): self.original = original.rstrip('/\\') super(AdjacentTempDirectory, self).__init__(delete=delete) @classmethod def _generate_names(cls, name): """Generates a series of temporary names. The algorithm replaces the leading characters in the name with ones that are valid filesystem characters, but are not valid package names (for both Python and pip definitions of package). """ for i in range(1, len(name)): for candidate in itertools.combinations_with_replacement( cls.LEADING_CHARS, i - 1): new_name = '~' + ''.join(candidate) + name[i:] if new_name != name: yield new_name # If we make it this far, we will have to make a longer name for i in range(len(cls.LEADING_CHARS)): for candidate in itertools.combinations_with_replacement( cls.LEADING_CHARS, i): new_name = '~' + ''.join(candidate) + name if new_name != name: yield new_name def _create(self, kind): root, name = os.path.split(self.original) for candidate in self._generate_names(name): path = os.path.join(root, candidate) try: os.mkdir(path) except OSError as ex: # Continue if the name exists already if ex.errno != errno.EEXIST: raise else: path = os.path.realpath(path) break else: # Final fallback on the default behavior. path = os.path.realpath( tempfile.mkdtemp(prefix="pip-{}-".format(kind)) ) logger.debug("Created temporary directory: {}".format(path)) return path
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