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GH-125413: Add private pathlib.Path method to write metadata (#130238)
Replace `WritablePath._copy_writer` with a new `_write_info()` method. This method allows the target of a `copy()` to preserve metadata. Replace `pathlib._os.CopyWriter` and `LocalCopyWriter` classes with new `copy_file()` and `copy_info()` functions. The `copy_file()` function uses `source_path.info` wherever possible to save on `stat()`s.
This commit is contained in:
Barney Gale
GitHub
parent
5ba69e747f
commit
b251d409f9
4 changed files with 122 additions and 174 deletions
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@ -102,16 +102,16 @@ else:
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if _winapi and hasattr(_winapi, 'CopyFile2'):
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def copyfile(source, target):
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def _copyfile2(source, target):
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"""
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Copy from one file to another using CopyFile2 (Windows only).
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"""
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_winapi.CopyFile2(source, target, 0)
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else:
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copyfile = None
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_copyfile2 = None
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def copyfileobj(source_f, target_f):
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def _copyfileobj(source_f, target_f):
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"""
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Copy data from file-like object source_f to file-like object target_f.
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"""
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@ -200,70 +200,6 @@ def magic_open(path, mode='r', buffering=-1, encoding=None, errors=None,
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raise TypeError(f"{cls.__name__} can't be opened with mode {mode!r}")
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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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def _copy_metadata(self, source, follow_symlinks=True):
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"""Copy metadata from the given path to our path."""
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pass
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def _create(self, source, follow_symlinks, dirs_exist_ok, preserve_metadata):
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ensure_distinct_paths(source, self._path)
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if not follow_symlinks and source.is_symlink():
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self._create_symlink(source, preserve_metadata)
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elif source.is_dir():
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self._create_dir(source, follow_symlinks, dirs_exist_ok, preserve_metadata)
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else:
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self._create_file(source, preserve_metadata)
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return self._path
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def _create_dir(self, source, follow_symlinks, dirs_exist_ok, preserve_metadata):
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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, preserve_metadata)
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elif src.is_dir():
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dst._copy_writer._create_dir(src, follow_symlinks, dirs_exist_ok, preserve_metadata)
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else:
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dst._copy_writer._create_file(src, preserve_metadata)
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if preserve_metadata:
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self._copy_metadata(source)
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def _create_file(self, source, preserve_metadata):
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"""Copy the given file to our path."""
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ensure_different_files(source, self._path)
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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 preserve_metadata:
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self._copy_metadata(source)
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def _create_symlink(self, source, preserve_metadata):
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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 preserve_metadata:
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self._copy_metadata(source, follow_symlinks=False)
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def ensure_distinct_paths(source, target):
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"""
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Raise OSError(EINVAL) if the other path is within this path.
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@ -284,94 +220,6 @@ def ensure_distinct_paths(source, target):
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raise err
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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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def _copy_metadata(self, source, follow_symlinks=True):
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"""Copy metadata from the given path to our path."""
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target = self._path
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info = source.info
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copy_times_ns = (
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hasattr(info, '_access_time_ns') and
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hasattr(info, '_mod_time_ns') and
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(follow_symlinks or os.utime in os.supports_follow_symlinks))
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if copy_times_ns:
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t0 = info._access_time_ns(follow_symlinks=follow_symlinks)
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t1 = info._mod_time_ns(follow_symlinks=follow_symlinks)
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os.utime(target, ns=(t0, t1), 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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copy_xattrs = (
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hasattr(info, '_xattrs') and
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hasattr(os, 'setxattr') and
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(follow_symlinks or os.setxattr in os.supports_follow_symlinks))
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if copy_xattrs:
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xattrs = info._xattrs(follow_symlinks=follow_symlinks)
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for attr, value in xattrs:
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try:
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os.setxattr(target, 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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copy_posix_permissions = (
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hasattr(info, '_posix_permissions') and
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(follow_symlinks or os.chmod in os.supports_follow_symlinks))
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if copy_posix_permissions:
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posix_permissions = info._posix_permissions(follow_symlinks=follow_symlinks)
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try:
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os.chmod(target, posix_permissions, 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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copy_bsd_flags = (
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hasattr(info, '_bsd_flags') and
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hasattr(os, 'chflags') and
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(follow_symlinks or os.chflags in os.supports_follow_symlinks))
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if copy_bsd_flags:
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bsd_flags = info._bsd_flags(follow_symlinks=follow_symlinks)
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try:
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os.chflags(target, bsd_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, preserve_metadata):
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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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super()._create_file(source, preserve_metadata)
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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, preserve_metadata):
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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 preserve_metadata:
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self._copy_metadata(source, follow_symlinks=False)
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def ensure_different_files(source, target):
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"""
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Raise OSError(EINVAL) if both paths refer to the same file.
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@ -394,6 +242,102 @@ def ensure_different_files(source, target):
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raise err
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def copy_file(source, target, follow_symlinks=True, dirs_exist_ok=False,
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preserve_metadata=False):
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"""
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Recursively copy the given source ReadablePath to the given target WritablePath.
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"""
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info = source.info
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if not follow_symlinks and info.is_symlink():
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target.symlink_to(source.readlink(), info.is_dir())
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if preserve_metadata:
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target._write_info(info, follow_symlinks=False)
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elif info.is_dir():
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children = source.iterdir()
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target.mkdir(exist_ok=dirs_exist_ok)
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for src in children:
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dst = target.joinpath(src.name)
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copy_file(src, dst, follow_symlinks, dirs_exist_ok, preserve_metadata)
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if preserve_metadata:
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target._write_info(info)
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else:
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if _copyfile2:
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# Use fast OS routine for local file copying where available.
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try:
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source_p = os.fspath(source)
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target_p = os.fspath(target)
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except TypeError:
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pass
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else:
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_copyfile2(source_p, target_p)
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return
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ensure_different_files(source, target)
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with magic_open(source, 'rb') as source_f:
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with magic_open(target, 'wb') as target_f:
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_copyfileobj(source_f, target_f)
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if preserve_metadata:
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target._write_info(info)
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def copy_info(info, target, follow_symlinks=True):
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"""Copy metadata from the given PathInfo to the given local path."""
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copy_times_ns = (
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hasattr(info, '_access_time_ns') and
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hasattr(info, '_mod_time_ns') and
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(follow_symlinks or os.utime in os.supports_follow_symlinks))
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if copy_times_ns:
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t0 = info._access_time_ns(follow_symlinks=follow_symlinks)
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t1 = info._mod_time_ns(follow_symlinks=follow_symlinks)
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os.utime(target, ns=(t0, t1), 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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copy_xattrs = (
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hasattr(info, '_xattrs') and
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hasattr(os, 'setxattr') and
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(follow_symlinks or os.setxattr in os.supports_follow_symlinks))
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if copy_xattrs:
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xattrs = info._xattrs(follow_symlinks=follow_symlinks)
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for attr, value in xattrs:
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try:
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os.setxattr(target, 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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copy_posix_permissions = (
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hasattr(info, '_posix_permissions') and
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(follow_symlinks or os.chmod in os.supports_follow_symlinks))
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if copy_posix_permissions:
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posix_permissions = info._posix_permissions(follow_symlinks=follow_symlinks)
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try:
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os.chmod(target, posix_permissions, 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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copy_bsd_flags = (
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hasattr(info, '_bsd_flags') and
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hasattr(os, 'chflags') and
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(follow_symlinks or os.chflags in os.supports_follow_symlinks))
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if copy_bsd_flags:
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bsd_flags = info._bsd_flags(follow_symlinks=follow_symlinks)
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try:
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os.chflags(target, bsd_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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class _PathInfoBase:
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__slots__ = ('_path', '_stat_result', '_lstat_result')
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