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GH-125413: Move pathlib.Path.copy() implementation alongside Path.info (#129856)

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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 2025-02-09 12:05:23 +00:00 • committed by GitHub
parent d5796e64e0
commit c88dacb391
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3 changed files with 297 additions and 300 deletions
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160
Lib/pathlib/_abc.py
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@ -12,11 +12,9 @@ WritablePath.
"""
import functools
import io
import posixpath
from errno import EINVAL
from glob import _PathGlobber, _no_recurse_symlinks
from pathlib._os import copyfileobj
from pathlib._os import magic_open, CopyReader, CopyWriter
@functools.cache
@ -41,162 +39,6 @@ def _explode_path(path):
return path, names
def magic_open(path, mode='r', buffering=-1, encoding=None, errors=None,
newline=None):
"""
Open the file pointed to by this path and return a file object, as
the built-in open() function does.
"""
try:
return io.open(path, mode, buffering, encoding, errors, newline)
except TypeError:
pass
cls = type(path)
text = 'b' not in mode
mode = ''.join(sorted(c for c in mode if c not in 'bt'))
if text:
try:
attr = getattr(cls, f'__open_{mode}__')
except AttributeError:
pass
else:
return attr(path, buffering, encoding, errors, newline)
try:
attr = getattr(cls, f'__open_{mode}b__')
except AttributeError:
pass
else:
stream = attr(path, buffering)
if text:
stream = io.TextIOWrapper(stream, encoding, errors, newline)
return stream
raise TypeError(f"{cls.__name__} can't be opened with mode {mode!r}")
class CopyReader:
"""
Class that implements the "read" part of copying between path objects.
An instance of this class is available from the ReadablePath._copy_reader
property.
"""
__slots__ = ('_path',)
def __init__(self, path):
self._path = path
_readable_metakeys = frozenset()
def _read_metadata(self, metakeys, *, follow_symlinks=True):
"""
Returns path metadata as a dict with string keys.
"""
raise NotImplementedError
class CopyWriter:
"""
Class that implements the "write" part of copying between path objects. An
instance of this class is available from the WritablePath._copy_writer
property.
"""
__slots__ = ('_path',)
def __init__(self, path):
self._path = path
_writable_metakeys = frozenset()
def _write_metadata(self, metadata, *, follow_symlinks=True):
"""
Sets path metadata from the given dict with string keys.
"""
raise NotImplementedError
def _create(self, source, follow_symlinks, dirs_exist_ok, preserve_metadata):
self._ensure_distinct_path(source)
if preserve_metadata:
metakeys = self._writable_metakeys & source._copy_reader._readable_metakeys
else:
metakeys = None
if not follow_symlinks and source.is_symlink():
self._create_symlink(source, metakeys)
elif source.is_dir():
self._create_dir(source, metakeys, follow_symlinks, dirs_exist_ok)
else:
self._create_file(source, metakeys)
return self._path
def _create_dir(self, source, metakeys, follow_symlinks, dirs_exist_ok):
"""Copy the given directory to our path."""
children = list(source.iterdir())
self._path.mkdir(exist_ok=dirs_exist_ok)
for src in children:
dst = self._path.joinpath(src.name)
if not follow_symlinks and src.is_symlink():
dst._copy_writer._create_symlink(src, metakeys)
elif src.is_dir():
dst._copy_writer._create_dir(src, metakeys, follow_symlinks, dirs_exist_ok)
else:
dst._copy_writer._create_file(src, metakeys)
if metakeys:
metadata = source._copy_reader._read_metadata(metakeys)
if metadata:
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 JoinablePath:
"""Base class for pure path objects.