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(#127810)
Move 9 private `PathBase` attributes and methods into a new `CopyWorker`
class. Change `PathBase.copy` from a method to a `CopyWorker` instance.
The methods remain private in the `CopyWorker` class. In future we might
make some/all of them public so that user subclasses of `PathBase` can
customize the copying process (in particular reading/writing of metadata,)
but we'd need to make `PathBase` public first.
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Give unique names to our low-level FD copying functions, and try each one
in turn. Handle errors appropriately for each implementation:
- `fcntl.FICLONE`: suppress `EBADF`, `EOPNOTSUPP`, `ETXTBSY`, `EXDEV`
- `posix._fcopyfile`: suppress `EBADF`, `ENOTSUP`
- `os.copy_file_range`: suppress `ETXTBSY`, `EXDEV`
- `os.sendfile`: suppress `ENOTSOCK`
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Rename `pathlib.Path.copy()` to `_copy_file()` (i.e. make it private.)
Rename `pathlib.Path.copytree()` to `copy()`, and add support for copying
non-directories. This simplifies the interface for users, and nicely
complements the upcoming `move()` and `delete()` methods (which will also
accept any type of file.)
Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
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Add *preserve_metadata* keyword-only argument to `pathlib.Path.copy()`, defaulting to false. When set to true, we copy timestamps, permissions, extended attributes and flags where available, like `shutil.copystat()`. The argument has no effect on Windows, where metadata is always copied.
Internally (in the pathlib ABCs), path types gain `_readable_metadata` and `_writable_metadata` attributes. These sets of strings describe what kinds of metadata can be retrieved and stored. We take an intersection of `source._readable_metadata` and `target._writable_metadata` to minimise reads/writes. A new `_read_metadata()` method accepts a set of metadata keys and returns a dict with those keys, and a new `_write_metadata()` method accepts a dict of metadata. We *might* make these public in future, but it's hard to justify while the ABCs are still private.
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Check for `ERROR_INVALID_PARAMETER` when calling `_winapi.CopyFile2()` and
raise `UnsupportedOperation`. In `Path.copy()`, handle this exception and
fall back to the `PathBase.copy()` implementation.
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Add support for not following symlinks in `pathlib.Path.copy()`.
On Windows we add the `COPY_FILE_COPY_SYMLINK` flag is following symlinks is disabled. If the source is symlink to a directory, this call will fail with `ERROR_ACCESS_DENIED`. In this case we add `COPY_FILE_DIRECTORY` to the flags and retry. This can fail on old Windowses, which we note in the docs.
No news as `copy()` was only just added.
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Add a `Path.copy()` method that copies the content of one file to another.
This method is similar to `shutil.copyfile()` but differs in the following ways:
- Uses `fcntl.FICLONE` where available (see GH-81338)
- Uses `os.copy_file_range` where available (see GH-81340)
- Uses `_winapi.CopyFile2` where available, even though this copies more metadata than the other implementations. This makes `WindowsPath.copy()` more similar to `shutil.copy2()`.
The method is presently _less_ specified than the `shutil` functions to allow OS-specific optimizations that might copy more or less metadata.
Incorporates code from GH-81338 and GH-93152.
Co-authored-by: Eryk Sun <eryksun@gmail.com>
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