fileutils¶

File utilities.

oslo_utils.fileutils.compute_file_checksum(path, read_chunksize=65536, algorithm='sha256')¶

Compute checksum of a file’s contents.

Parameters:	path – Path to the file read_chunksize – Maximum number of bytes to be read from the file at once. Default is 65536 bytes or 64KB algorithm – The hash algorithm name to use. For example, ‘md5’, ‘sha256’, ‘sha512’ and so on. Default is ‘sha256’. Refer to hashlib.algorithms_available for available algorithms
Returns:	Hex digest string of the checksum

New in version 3.31.0.

oslo_utils.fileutils.delete_if_exists(path, remove=<built-in function unlink>)¶

Delete a file, but ignore file not found error.

Parameters:	path – File to delete remove – Optional function to remove passed path

oslo_utils.fileutils.ensure_tree(path, mode=511)¶

Create a directory (and any ancestor directories required)

Parameters:	path – Directory to create mode – Directory creation permissions

oslo_utils.fileutils.last_bytes(path, num)¶

Return num bytes from the end of the file and unread byte count.

Returns a tuple containing some content from the file and the number of bytes that appear in the file before the point at which reading started. The content will be at most num bytes, taken from the end of the file. If the file is smaller than num bytes the entire content of the file is returned.

Parameters:	path – The file path to read num – The number of bytes to return
Returns:	(data, unread_bytes)

oslo_utils.fileutils.remove_path_on_error(path, remove=<function delete_if_exists>)¶

Protect code that wants to operate on PATH atomically. Any exception will cause PATH to be removed.

Parameters:	path – File to work with remove – Optional function to remove passed path

oslo_utils.fileutils.write_to_tempfile(content, path=None, suffix='', prefix='tmp')¶

Create a temporary file containing data.

Create a temporary file containing specified content, with a specified filename suffix and prefix. The tempfile will be created in a default location, or in the directory path, if it is not None. path and its parent directories will be created if they don’t exist.

Parameters:	content – bytestring to write to the file path – same as parameter ‘dir’ for mkstemp suffix – same as parameter ‘suffix’ for mkstemp prefix – same as parameter ‘prefix’ for mkstemp

For example: it can be used in database tests for creating configuration files.

New in version 1.9.