mirror of https://github.com/python/cpython.git
GH-125413: Move `pathlib.Path.copy()` implementation alongside `Path.info` (#129856)
Move pathlib's private `CopyReader`, `LocalCopyReader`, `CopyWriter` and `LocalCopyWriter` classes into `pathlib._os`, where they can live alongside the low-level copying functions (`copyfileobj()` etc) and high-level path querying interface (`PathInfo`). This sets the stage for merging `LocalCopyReader` into `PathInfo`. No change of behaviour; just moving some code around.
This commit is contained in:
Barney Gale
GitHub
parent
d5796e64e0
commit
c88dacb391
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@ -12,11 +12,9 @@
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"""
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import functools
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import io
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import posixpath
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from errno import EINVAL
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from glob import _PathGlobber, _no_recurse_symlinks
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from pathlib._os import copyfileobj
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from pathlib._os import magic_open, CopyReader, CopyWriter
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@functools.cache
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@ -41,162 +39,6 @@ def _explode_path(path):
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return path, names
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def magic_open(path, mode='r', buffering=-1, encoding=None, errors=None,
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newline=None):
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"""
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Open the file pointed to by this path and return a file object, as
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the built-in open() function does.
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"""
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try:
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return io.open(path, mode, buffering, encoding, errors, newline)
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except TypeError:
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pass
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cls = type(path)
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text = 'b' not in mode
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mode = ''.join(sorted(c for c in mode if c not in 'bt'))
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if text:
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try:
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attr = getattr(cls, f'__open_{mode}__')
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except AttributeError:
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pass
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else:
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return attr(path, buffering, encoding, errors, newline)
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try:
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attr = getattr(cls, f'__open_{mode}b__')
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except AttributeError:
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pass
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else:
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stream = attr(path, buffering)
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if text:
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stream = io.TextIOWrapper(stream, encoding, errors, newline)
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return stream
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raise TypeError(f"{cls.__name__} can't be opened with mode {mode!r}")
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class CopyReader:
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"""
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Class that implements the "read" part of copying between path objects.
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An instance of this class is available from the ReadablePath._copy_reader
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property.
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"""
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__slots__ = ('_path',)
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def __init__(self, path):
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self._path = path
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_readable_metakeys = frozenset()
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def _read_metadata(self, metakeys, *, follow_symlinks=True):
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"""
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Returns path metadata as a dict with string keys.
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"""
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raise NotImplementedError
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class CopyWriter:
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"""
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Class that implements the "write" part of copying between path objects. An
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instance of this class is available from the WritablePath._copy_writer
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property.
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"""
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__slots__ = ('_path',)
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def __init__(self, path):
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self._path = path
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_writable_metakeys = frozenset()
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def _write_metadata(self, metadata, *, follow_symlinks=True):
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"""
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Sets path metadata from the given dict with string keys.
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"""
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raise NotImplementedError
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def _create(self, source, follow_symlinks, dirs_exist_ok, preserve_metadata):
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self._ensure_distinct_path(source)
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if preserve_metadata:
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metakeys = self._writable_metakeys & source._copy_reader._readable_metakeys
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else:
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metakeys = None
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if not follow_symlinks and source.is_symlink():
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self._create_symlink(source, metakeys)
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elif source.is_dir():
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self._create_dir(source, metakeys, follow_symlinks, dirs_exist_ok)
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else:
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self._create_file(source, metakeys)
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return self._path
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def _create_dir(self, source, metakeys, follow_symlinks, dirs_exist_ok):
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"""Copy the given directory to our path."""
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children = list(source.iterdir())
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self._path.mkdir(exist_ok=dirs_exist_ok)
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for src in children:
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dst = self._path.joinpath(src.name)
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if not follow_symlinks and src.is_symlink():
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dst._copy_writer._create_symlink(src, metakeys)
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elif src.is_dir():
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dst._copy_writer._create_dir(src, metakeys, follow_symlinks, dirs_exist_ok)
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else:
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dst._copy_writer._create_file(src, metakeys)
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if metakeys:
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metadata = source._copy_reader._read_metadata(metakeys)
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if metadata:
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self._write_metadata(metadata)
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def _create_file(self, source, metakeys):
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"""Copy the given file to our path."""
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self._ensure_different_file(source)
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with magic_open(source, 'rb') as source_f:
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try:
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with magic_open(self._path, 'wb') as target_f:
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copyfileobj(source_f, target_f)
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except IsADirectoryError as e:
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if not self._path.exists():
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# Raise a less confusing exception.
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raise FileNotFoundError(
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f'Directory does not exist: {self._path}') from e
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raise
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if metakeys:
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metadata = source._copy_reader._read_metadata(metakeys)
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if metadata:
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self._write_metadata(metadata)
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def _create_symlink(self, source, metakeys):
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"""Copy the given symbolic link to our path."""
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self._path.symlink_to(source.readlink())
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if metakeys:
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metadata = source._copy_reader._read_metadata(metakeys, follow_symlinks=False)
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if metadata:
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self._write_metadata(metadata, follow_symlinks=False)
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def _ensure_different_file(self, source):
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"""
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Raise OSError(EINVAL) if both paths refer to the same file.
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"""
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pass
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def _ensure_distinct_path(self, source):
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"""
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Raise OSError(EINVAL) if the other path is within this path.
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"""
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# Note: there is no straightforward, foolproof algorithm to determine
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# if one directory is within another (a particularly perverse example
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# would be a single network share mounted in one location via NFS, and
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# in another location via CIFS), so we simply checks whether the
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# other path is lexically equal to, or within, this path.
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if source == self._path:
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err = OSError(EINVAL, "Source and target are the same path")
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elif source in self._path.parents:
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err = OSError(EINVAL, "Source path is a parent of target path")
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else:
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return
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err.filename = str(source)
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err.filename2 = str(self._path)
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raise err
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class JoinablePath:
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"""Base class for pure path objects.
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@ -7,7 +7,7 @@
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from errno import *
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from glob import _StringGlobber, _no_recurse_symlinks
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from itertools import chain
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from stat import S_IMODE, S_ISDIR, S_ISREG, S_ISSOCK, S_ISBLK, S_ISCHR, S_ISFIFO
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from stat import S_ISDIR, S_ISREG, S_ISSOCK, S_ISBLK, S_ISCHR, S_ISFIFO
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from _collections_abc import Sequence
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try:
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@ -19,8 +19,8 @@
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except ImportError:
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grp = None
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from pathlib._os import copyfile, PathInfo, DirEntryInfo
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from pathlib._abc import CopyReader, CopyWriter, JoinablePath, ReadablePath, WritablePath
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from pathlib._os import LocalCopyReader, LocalCopyWriter, PathInfo, DirEntryInfo
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from pathlib._abc import JoinablePath, ReadablePath, WritablePath
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__all__ = [
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@ -65,141 +65,6 @@ def __repr__(self):
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return "<{}.parents>".format(type(self._path).__name__)
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class _LocalCopyReader(CopyReader):
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"""This object implements the "read" part of copying local paths. Don't
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try to construct it yourself.
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"""
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__slots__ = ()
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_readable_metakeys = {'mode', 'times_ns'}
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if hasattr(os.stat_result, 'st_flags'):
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_readable_metakeys.add('flags')
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if hasattr(os, 'listxattr'):
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_readable_metakeys.add('xattrs')
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_readable_metakeys = frozenset(_readable_metakeys)
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def _read_metadata(self, metakeys, *, follow_symlinks=True):
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metadata = {}
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if 'mode' in metakeys or 'times_ns' in metakeys or 'flags' in metakeys:
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st = self._path.stat(follow_symlinks=follow_symlinks)
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if 'mode' in metakeys:
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metadata['mode'] = S_IMODE(st.st_mode)
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if 'times_ns' in metakeys:
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metadata['times_ns'] = st.st_atime_ns, st.st_mtime_ns
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if 'flags' in metakeys:
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metadata['flags'] = st.st_flags
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if 'xattrs' in metakeys:
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try:
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metadata['xattrs'] = [
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(attr, os.getxattr(self._path, attr, follow_symlinks=follow_symlinks))
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for attr in os.listxattr(self._path, follow_symlinks=follow_symlinks)]
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except OSError as err:
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if err.errno not in (EPERM, ENOTSUP, ENODATA, EINVAL, EACCES):
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raise
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return metadata
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class _LocalCopyWriter(CopyWriter):
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"""This object implements the "write" part of copying local paths. Don't
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try to construct it yourself.
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"""
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__slots__ = ()
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_writable_metakeys = _LocalCopyReader._readable_metakeys
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def _write_metadata(self, metadata, *, follow_symlinks=True):
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def _nop(*args, ns=None, follow_symlinks=None):
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pass
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if follow_symlinks:
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# use the real function if it exists
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def lookup(name):
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return getattr(os, name, _nop)
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else:
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# use the real function only if it exists
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# *and* it supports follow_symlinks
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def lookup(name):
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fn = getattr(os, name, _nop)
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if fn in os.supports_follow_symlinks:
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return fn
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return _nop
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times_ns = metadata.get('times_ns')
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if times_ns is not None:
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lookup("utime")(self._path, ns=times_ns, follow_symlinks=follow_symlinks)
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# We must copy extended attributes before the file is (potentially)
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# chmod()'ed read-only, otherwise setxattr() will error with -EACCES.
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xattrs = metadata.get('xattrs')
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if xattrs is not None:
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for attr, value in xattrs:
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try:
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os.setxattr(self._path, attr, value, follow_symlinks=follow_symlinks)
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except OSError as e:
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if e.errno not in (EPERM, ENOTSUP, ENODATA, EINVAL, EACCES):
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raise
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mode = metadata.get('mode')
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if mode is not None:
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try:
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lookup("chmod")(self._path, mode, follow_symlinks=follow_symlinks)
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except NotImplementedError:
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# if we got a NotImplementedError, it's because
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# * follow_symlinks=False,
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# * lchown() is unavailable, and
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# * either
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# * fchownat() is unavailable or
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# * fchownat() doesn't implement AT_SYMLINK_NOFOLLOW.
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# (it returned ENOSUP.)
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# therefore we're out of options--we simply cannot chown the
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# symlink. give up, suppress the error.
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# (which is what shutil always did in this circumstance.)
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pass
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flags = metadata.get('flags')
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if flags is not None:
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try:
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lookup("chflags")(self._path, flags, follow_symlinks=follow_symlinks)
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except OSError as why:
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if why.errno not in (EOPNOTSUPP, ENOTSUP):
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raise
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if copyfile:
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# Use fast OS routine for local file copying where available.
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def _create_file(self, source, metakeys):
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"""Copy the given file to the given target."""
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try:
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source = os.fspath(source)
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except TypeError:
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if not isinstance(source, WritablePath):
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raise
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super()._create_file(source, metakeys)
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else:
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copyfile(source, os.fspath(self._path))
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if os.name == 'nt':
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# Windows: symlink target might not exist yet if we're copying several
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# files, so ensure we pass is_dir to os.symlink().
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def _create_symlink(self, source, metakeys):
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"""Copy the given symlink to the given target."""
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self._path.symlink_to(source.readlink(), source.is_dir())
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if metakeys:
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metadata = source._copy_reader._read_metadata(metakeys, follow_symlinks=False)
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if metadata:
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self._write_metadata(metadata, follow_symlinks=False)
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def _ensure_different_file(self, source):
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"""
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Raise OSError(EINVAL) if both paths refer to the same file.
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"""
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try:
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if not self._path.samefile(source):
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return
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except (OSError, ValueError):
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return
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err = OSError(EINVAL, "Source and target are the same file")
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err.filename = str(source)
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err.filename2 = str(self._path)
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raise err
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class PurePath(JoinablePath):
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"""Base class for manipulating paths without I/O.
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@ -1190,8 +1055,8 @@ def replace(self, target):
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os.replace(self, target)
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return self.with_segments(target)
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_copy_reader = property(_LocalCopyReader)
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_copy_writer = property(_LocalCopyWriter)
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_copy_reader = property(LocalCopyReader)
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_copy_writer = property(LocalCopyWriter)
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def move(self, target):
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"""
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@ -3,7 +3,8 @@
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"""
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from errno import *
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from stat import S_ISDIR, S_ISREG, S_ISLNK
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from stat import S_ISDIR, S_ISREG, S_ISLNK, S_IMODE
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import io
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import os
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import sys
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try:
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@ -165,6 +166,295 @@ def copyfileobj(source_f, target_f):
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write_target(buf)
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def magic_open(path, mode='r', buffering=-1, encoding=None, errors=None,
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newline=None):
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"""
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Open the file pointed to by this path and return a file object, as
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the built-in open() function does.
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"""
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try:
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return io.open(path, mode, buffering, encoding, errors, newline)
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except TypeError:
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pass
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cls = type(path)
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text = 'b' not in mode
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mode = ''.join(sorted(c for c in mode if c not in 'bt'))
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if text:
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try:
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attr = getattr(cls, f'__open_{mode}__')
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except AttributeError:
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pass
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else:
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return attr(path, buffering, encoding, errors, newline)
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try:
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attr = getattr(cls, f'__open_{mode}b__')
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except AttributeError:
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pass
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else:
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stream = attr(path, buffering)
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if text:
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stream = io.TextIOWrapper(stream, encoding, errors, newline)
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return stream
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raise TypeError(f"{cls.__name__} can't be opened with mode {mode!r}")
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|
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class CopyReader:
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"""
|
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Class that implements the "read" part of copying between path objects.
|
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An instance of this class is available from the ReadablePath._copy_reader
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property.
|
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"""
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__slots__ = ('_path',)
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|
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def __init__(self, path):
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self._path = path
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_readable_metakeys = frozenset()
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|
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def _read_metadata(self, metakeys, *, follow_symlinks=True):
|
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"""
|
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Returns path metadata as a dict with string keys.
|
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"""
|
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raise NotImplementedError
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|
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|
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class CopyWriter:
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"""
|
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Class that implements the "write" part of copying between path objects. An
|
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instance of this class is available from the WritablePath._copy_writer
|
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property.
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"""
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__slots__ = ('_path',)
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def __init__(self, path):
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self._path = path
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_writable_metakeys = frozenset()
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def _write_metadata(self, metadata, *, follow_symlinks=True):
|
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"""
|
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Sets path metadata from the given dict with string keys.
|
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"""
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raise NotImplementedError
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|
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def _create(self, source, follow_symlinks, dirs_exist_ok, preserve_metadata):
|
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self._ensure_distinct_path(source)
|
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if preserve_metadata:
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metakeys = self._writable_metakeys & source._copy_reader._readable_metakeys
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else:
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metakeys = None
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if not follow_symlinks and source.is_symlink():
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self._create_symlink(source, metakeys)
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elif source.is_dir():
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self._create_dir(source, metakeys, follow_symlinks, dirs_exist_ok)
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else:
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self._create_file(source, metakeys)
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return self._path
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def _create_dir(self, source, metakeys, follow_symlinks, dirs_exist_ok):
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"""Copy the given directory to our path."""
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children = list(source.iterdir())
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self._path.mkdir(exist_ok=dirs_exist_ok)
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for src in children:
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dst = self._path.joinpath(src.name)
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if not follow_symlinks and src.is_symlink():
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dst._copy_writer._create_symlink(src, metakeys)
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elif src.is_dir():
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dst._copy_writer._create_dir(src, metakeys, follow_symlinks, dirs_exist_ok)
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else:
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dst._copy_writer._create_file(src, metakeys)
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if metakeys:
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metadata = source._copy_reader._read_metadata(metakeys)
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if metadata:
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||||
self._write_metadata(metadata)
|
||||
|
||||
def _create_file(self, source, metakeys):
|
||||
"""Copy the given file to our path."""
|
||||
self._ensure_different_file(source)
|
||||
with magic_open(source, 'rb') as source_f:
|
||||
try:
|
||||
with magic_open(self._path, 'wb') as target_f:
|
||||
copyfileobj(source_f, target_f)
|
||||
except IsADirectoryError as e:
|
||||
if not self._path.exists():
|
||||
# Raise a less confusing exception.
|
||||
raise FileNotFoundError(
|
||||
f'Directory does not exist: {self._path}') from e
|
||||
raise
|
||||
if metakeys:
|
||||
metadata = source._copy_reader._read_metadata(metakeys)
|
||||
if metadata:
|
||||
self._write_metadata(metadata)
|
||||
|
||||
def _create_symlink(self, source, metakeys):
|
||||
"""Copy the given symbolic link to our path."""
|
||||
self._path.symlink_to(source.readlink())
|
||||
if metakeys:
|
||||
metadata = source._copy_reader._read_metadata(metakeys, follow_symlinks=False)
|
||||
if metadata:
|
||||
self._write_metadata(metadata, follow_symlinks=False)
|
||||
|
||||
def _ensure_different_file(self, source):
|
||||
"""
|
||||
Raise OSError(EINVAL) if both paths refer to the same file.
|
||||
"""
|
||||
pass
|
||||
|
||||
def _ensure_distinct_path(self, source):
|
||||
"""
|
||||
Raise OSError(EINVAL) if the other path is within this path.
|
||||
"""
|
||||
# Note: there is no straightforward, foolproof algorithm to determine
|
||||
# if one directory is within another (a particularly perverse example
|
||||
# would be a single network share mounted in one location via NFS, and
|
||||
# in another location via CIFS), so we simply checks whether the
|
||||
# other path is lexically equal to, or within, this path.
|
||||
if source == self._path:
|
||||
err = OSError(EINVAL, "Source and target are the same path")
|
||||
elif source in self._path.parents:
|
||||
err = OSError(EINVAL, "Source path is a parent of target path")
|
||||
else:
|
||||
return
|
||||
err.filename = str(source)
|
||||
err.filename2 = str(self._path)
|
||||
raise err
|
||||
|
||||
|
||||
class LocalCopyReader(CopyReader):
|
||||
"""This object implements the "read" part of copying local paths. Don't
|
||||
try to construct it yourself.
|
||||
"""
|
||||
__slots__ = ()
|
||||
|
||||
_readable_metakeys = {'mode', 'times_ns'}
|
||||
if hasattr(os.stat_result, 'st_flags'):
|
||||
_readable_metakeys.add('flags')
|
||||
if hasattr(os, 'listxattr'):
|
||||
_readable_metakeys.add('xattrs')
|
||||
_readable_metakeys = frozenset(_readable_metakeys)
|
||||
|
||||
def _read_metadata(self, metakeys, *, follow_symlinks=True):
|
||||
metadata = {}
|
||||
if 'mode' in metakeys or 'times_ns' in metakeys or 'flags' in metakeys:
|
||||
st = self._path.stat(follow_symlinks=follow_symlinks)
|
||||
if 'mode' in metakeys:
|
||||
metadata['mode'] = S_IMODE(st.st_mode)
|
||||
if 'times_ns' in metakeys:
|
||||
metadata['times_ns'] = st.st_atime_ns, st.st_mtime_ns
|
||||
if 'flags' in metakeys:
|
||||
metadata['flags'] = st.st_flags
|
||||
if 'xattrs' in metakeys:
|
||||
try:
|
||||
metadata['xattrs'] = [
|
||||
(attr, os.getxattr(self._path, attr, follow_symlinks=follow_symlinks))
|
||||
for attr in os.listxattr(self._path, follow_symlinks=follow_symlinks)]
|
||||
except OSError as err:
|
||||
if err.errno not in (EPERM, ENOTSUP, ENODATA, EINVAL, EACCES):
|
||||
raise
|
||||
return metadata
|
||||
|
||||
|
||||
class LocalCopyWriter(CopyWriter):
|
||||
"""This object implements the "write" part of copying local paths. Don't
|
||||
try to construct it yourself.
|
||||
"""
|
||||
__slots__ = ()
|
||||
|
||||
_writable_metakeys = LocalCopyReader._readable_metakeys
|
||||
|
||||
def _write_metadata(self, metadata, *, follow_symlinks=True):
|
||||
def _nop(*args, ns=None, follow_symlinks=None):
|
||||
pass
|
||||
|
||||
if follow_symlinks:
|
||||
# use the real function if it exists
|
||||
def lookup(name):
|
||||
return getattr(os, name, _nop)
|
||||
else:
|
||||
# use the real function only if it exists
|
||||
# *and* it supports follow_symlinks
|
||||
def lookup(name):
|
||||
fn = getattr(os, name, _nop)
|
||||
if fn in os.supports_follow_symlinks:
|
||||
return fn
|
||||
return _nop
|
||||
|
||||
times_ns = metadata.get('times_ns')
|
||||
if times_ns is not None:
|
||||
lookup("utime")(self._path, ns=times_ns, follow_symlinks=follow_symlinks)
|
||||
# We must copy extended attributes before the file is (potentially)
|
||||
# chmod()'ed read-only, otherwise setxattr() will error with -EACCES.
|
||||
xattrs = metadata.get('xattrs')
|
||||
if xattrs is not None:
|
||||
for attr, value in xattrs:
|
||||
try:
|
||||
os.setxattr(self._path, attr, value, follow_symlinks=follow_symlinks)
|
||||
except OSError as e:
|
||||
if e.errno not in (EPERM, ENOTSUP, ENODATA, EINVAL, EACCES):
|
||||
raise
|
||||
mode = metadata.get('mode')
|
||||
if mode is not None:
|
||||
try:
|
||||
lookup("chmod")(self._path, mode, follow_symlinks=follow_symlinks)
|
||||
except NotImplementedError:
|
||||
# if we got a NotImplementedError, it's because
|
||||
# * follow_symlinks=False,
|
||||
# * lchown() is unavailable, and
|
||||
# * either
|
||||
# * fchownat() is unavailable or
|
||||
# * fchownat() doesn't implement AT_SYMLINK_NOFOLLOW.
|
||||
# (it returned ENOSUP.)
|
||||
# therefore we're out of options--we simply cannot chown the
|
||||
# symlink. give up, suppress the error.
|
||||
# (which is what shutil always did in this circumstance.)
|
||||
pass
|
||||
flags = metadata.get('flags')
|
||||
if flags is not None:
|
||||
try:
|
||||
lookup("chflags")(self._path, flags, follow_symlinks=follow_symlinks)
|
||||
except OSError as why:
|
||||
if why.errno not in (EOPNOTSUPP, ENOTSUP):
|
||||
raise
|
||||
|
||||
if copyfile:
|
||||
# Use fast OS routine for local file copying where available.
|
||||
def _create_file(self, source, metakeys):
|
||||
"""Copy the given file to the given target."""
|
||||
try:
|
||||
source = os.fspath(source)
|
||||
except TypeError:
|
||||
super()._create_file(source, metakeys)
|
||||
else:
|
||||
copyfile(source, os.fspath(self._path))
|
||||
|
||||
if os.name == 'nt':
|
||||
# Windows: symlink target might not exist yet if we're copying several
|
||||
# files, so ensure we pass is_dir to os.symlink().
|
||||
def _create_symlink(self, source, metakeys):
|
||||
"""Copy the given symlink to the given target."""
|
||||
self._path.symlink_to(source.readlink(), source.is_dir())
|
||||
if metakeys:
|
||||
metadata = source._copy_reader._read_metadata(metakeys, follow_symlinks=False)
|
||||
if metadata:
|
||||
self._write_metadata(metadata, follow_symlinks=False)
|
||||
|
||||
def _ensure_different_file(self, source):
|
||||
"""
|
||||
Raise OSError(EINVAL) if both paths refer to the same file.
|
||||
"""
|
||||
try:
|
||||
if not self._path.samefile(source):
|
||||
return
|
||||
except (OSError, ValueError):
|
||||
return
|
||||
err = OSError(EINVAL, "Source and target are the same file")
|
||||
err.filename = str(source)
|
||||
err.filename2 = str(self._path)
|
||||
raise err
|
||||
|
||||
|
||||
class _PathInfoBase:
|
||||
__slots__ = ()
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue