Versioned

class audbackend.interface.Versioned(backend)[source]

Interface for versioned file access.

Use this interface if you care about versioning. For each file on the backend path one or more versions may exist.

Parameters

backend (Base) – backend object

Examples

>>> host = audeer.mkdir("host")
>>> audbackend.backend.FileSystem.create(host, "repo")
>>> backend = audbackend.backend.FileSystem(host, "repo")
>>> backend.open()
>>> interface = Versioned(backend)
>>> file = "src.txt"
>>> interface.put_archive(".", "/sub/archive.zip", "1.0.0", files=[file])
>>> for version in ["1.0.0", "2.0.0"]:
...     interface.put_file(file, "/file.txt", version)
>>> interface.ls()
[('/file.txt', '1.0.0'), ('/file.txt', '2.0.0'), ('/sub/archive.zip', '1.0.0')]
>>> interface.get_file("/file.txt", "dst.txt", "2.0.0")
'...dst.txt'

backend

Versioned.backend

Backend object.

Returns

backend object

Examples

>>> interface.backend
audbackend.backend.FileSystem('host', 'repo')

checksum()

Versioned.checksum(path, version)[source]

MD5 checksum for file on backend.

Parameters

  • path (str) – path to file on backend

  • version (str) – version string

Return type

str

Returns

MD5 checksum

Raises

  • BackendError – if an error is raised on the backend, e.g. path does not exist

  • ValueError – if path does not start with '/', ends on '/', or does not match '[A-Za-z0-9/._-]+'

  • ValueError – if version is empty or does not match '[A-Za-z0-9._-]+'

  • RuntimeError – if backend was not opened

Examples

>>> file = "src.txt"
>>> import audeer
>>> audbackend.checksum(file)
'd41d8cd98f00b204e9800998ecf8427e'
>>> interface.put_file(file, "/file.txt", "1.0.0")
>>> interface.checksum("/file.txt", "1.0.0")
'd41d8cd98f00b204e9800998ecf8427e'

copy_file()

Versioned.copy_file(src_path, dst_path, *, version=None, validate=False, verbose=False)[source]

Copy file on backend.

If version is None all versions of src_path will be copied.

If dst_path exists and has a different checksum, it is overwritten. Otherwise, the operation is silently skipped.

If validate is set to True, a final check is performed to assert that src_path and dst_path have the same checksum. If it fails, dst_path is removed and an InterruptedError is raised.

Parameters

  • src_path (str) – source path to file on backend

  • dst_path (str) – destination path to file on backend

  • validate (bool) – verify file was successfully copied

  • version (Optional[str]) – version string

  • verbose (bool) – show debug messages

Raises

  • BackendError – if an error is raised on the backend

  • InterruptedError – if validation fails

  • ValueError – if src_path or dst_path does not start with '/', ends on '/', or does not match '[A-Za-z0-9/._-]+'

  • ValueError – if version is empty or does not match '[A-Za-z0-9._-]+'

  • RuntimeError – if backend was not opened

Examples

>>> file = "src.txt"
>>> interface.put_file(file, "/file.txt", "1.0.0")
>>> interface.exists("/copy.txt", "1.0.0")
False
>>> interface.copy_file("/file.txt", "/copy.txt", version="1.0.0")
>>> interface.exists("/copy.txt", "1.0.0")
True

date()

Versioned.date(path, version)[source]

Last modification date of file on backend.

If the date cannot be determined, an empty string is returned.

Parameters

  • path (str) – path to file on backend

  • version (str) – version string

Return type

str

Returns

date in format 'yyyy-mm-dd'

Raises

  • BackendError – if an error is raised on the backend, e.g. path does not exist

  • ValueError – if path does not start with '/', ends on '/', or does not match '[A-Za-z0-9/._-]+'

  • ValueError – if version is empty or does not match '[A-Za-z0-9._-]+'

  • RuntimeError – if backend was not opened

Examples

>>> file = "src.txt"
>>> interface.put_file(file, "/file.txt", "1.0.0")
>>> interface.date("/file.txt", "1.0.0")
'1991-02-20'

exists()

Versioned.exists(path, version, *, suppress_backend_errors=False)[source]

Check if file exists on backend.

Parameters

  • path (str) – path to file on backend

  • version (str) – version string

  • suppress_backend_errors (bool) – if set to True, silently catch errors raised on the backend and return False

Return type

bool

Returns

True if file exists

Raises

  • BackendError – if suppress_backend_errors is False and an error is raised on the backend, e.g. due to a connection timeout

  • ValueError – if path does not start with '/', ends on '/', or does not match '[A-Za-z0-9/._-]+'

  • ValueError – if version is empty or does not match '[A-Za-z0-9._-]+'

  • RuntimeError – if backend was not opened

Examples

>>> file = "src.txt"
>>> interface.exists("/file.txt", "1.0.0")
False
>>> interface.put_file(file, "/file.txt", "1.0.0")
>>> interface.exists("/file.txt", "1.0.0")
True

get_archive()

Versioned.get_archive(src_path, dst_root, version, *, tmp_root=None, validate=False, verbose=False)[source]

Get archive from backend and extract.

The archive type is derived from the extension of src_path. See audeer.extract_archive() for supported extensions.

If dst_root does not exist, it is created.

If validate is set to True, a final check is performed to assert that src_path and the retrieved archive have the same checksum. If it fails, the retrieved archive is removed and an InterruptedError is raised.

Parameters

  • src_path (str) – path to archive on backend

  • dst_root (str) – local destination directory

  • version (str) – version string

  • tmp_root (Optional[str]) – directory under which archive is temporarily extracted. Defaults to temporary directory of system

  • validate (bool) – verify archive was successfully retrieved from the backend

  • verbose (bool) – show debug messages

Return type

list[str]

Returns

extracted files

Raises

Examples

>>> file = "src.txt"
>>> interface.put_archive(".", "/sub/archive.zip", "1.0.0", files=[file])
>>> os.remove(file)
>>> interface.get_archive("/sub/archive.zip", ".", "1.0.0")
['src.txt']

get_file()

Versioned.get_file(src_path, dst_path, version, *, validate=False, verbose=False)[source]

Get file from backend.

If the folder of dst_path does not exist, it is created.

If dst_path exists with a different checksum, it is overwritten, or otherwise, the operation is silently skipped.

If validate is set to True, a final check is performed to assert that src_path and dst_path have the same checksum. If it fails, dst_path is removed and an InterruptedError is raised.

Parameters

  • src_path (str) – path to file on backend

  • dst_path (str) – destination path to local file

  • version (str) – version string

  • validate (bool) – verify file was successfully retrieved from the backend

  • verbose (bool) – show debug messages

Return type

str

Returns

full path to local file

Raises

  • BackendError – if an error is raised on the backend, e.g. src_path does not exist

  • InterruptedError – if validation fails

  • IsADirectoryError – if dst_path points to an existing folder

  • PermissionError – if the user lacks write permissions for dst_path

  • ValueError – if src_path does not start with '/', ends on '/', or does not match '[A-Za-z0-9/._-]+'

  • ValueError – if version is empty or does not match '[A-Za-z0-9._-]+'

  • RuntimeError – if backend was not opened

Examples

>>> file = "src.txt"
>>> interface.put_file(file, "/file.txt", "1.0.0")
>>> interface.get_file("/file.txt", "dst.txt", "1.0.0")
'...dst.txt'

host

Versioned.host

Host path.

Returns: host path

Examples

>>> interface.host
'host'

join()

Versioned.join(path, *paths)

Join to path on backend.

Parameters

  • path (str) – first part of path

  • *paths – additional parts of path

Return type

str

Returns

path joined by Backend.sep

Raises

ValueError – if path contains invalid character or does not start with '/', or if joined path contains invalid character

Examples

>>> interface.join("/", "file.txt")
'/file.txt'
>>> interface.join("/sub", "file.txt")
'/sub/file.txt'
>>> interface.join("//sub//", "/", "", None, "/file.txt")
'/sub/file.txt'

latest_version()

Versioned.latest_version(path)[source]

Latest version of a file.

Parameters

path (str) – path to file on backend

Return type

str

Returns

version string

Raises

  • BackendError – if an error is raised on the backend, e.g. path does not exist

  • ValueError – if path does not start with '/', ends on '/', or does not match '[A-Za-z0-9/._-]+'

  • RuntimeError –

    if backend was not opened

Examples

>>> file = "src.txt"
>>> interface.put_file(file, "/file.txt", "1.0.0")
>>> interface.put_file(file, "/file.txt", "2.0.0")
>>> interface.latest_version("/file.txt")
'2.0.0'

ls()

Versioned.ls(path='/', *, latest_version=False, pattern=None, suppress_backend_errors=False)[source]

List files on backend.

Returns a sorted list of tuples with path and version. If a full path (e.g. /sub/file.ext) is provided, all versions of the path are returned. If a sub-path (e.g. /sub/) is provided, all files that start with the sub-path are returned. When path is set to '/' a (possibly empty) list with all files on the backend is returned.

Parameters

  • path (str) – path or sub-path (if it ends with '/') on backend

  • latest_version (bool) – if multiple versions of a file exist, only include the latest

  • pattern (Optional[str]) – if not None, return only files matching the pattern string, see fnmatch.fnmatch()

  • suppress_backend_errors (bool) – if set to True, silently catch errors raised on the backend and return an empty list

Return type

list[tuple[str, str]]

Returns

list of tuples (path, version)

Raises

  • BackendError – if suppress_backend_errors is False and an error is raised on the backend, e.g. path does not exist

  • ValueError – if path does not start with '/' or does not match '[A-Za-z0-9/._-]+'

  • RuntimeError – if backend was not opened

Examples

>>> file = "src.txt"
>>> interface.put_file(file, "/file.txt", "1.0.0")
>>> interface.put_file(file, "/file.txt", "2.0.0")
>>> interface.put_archive(".", "/sub/archive.zip", "1.0.0", files=[file])
>>> interface.ls()
[('/file.txt', '1.0.0'), ('/file.txt', '2.0.0'), ('/sub/archive.zip', '1.0.0')]
>>> interface.ls(latest_version=True)
[('/file.txt', '2.0.0'), ('/sub/archive.zip', '1.0.0')]
>>> interface.ls("/file.txt")
[('/file.txt', '1.0.0'), ('/file.txt', '2.0.0')]
>>> interface.ls(pattern="*.txt")
[('/file.txt', '1.0.0'), ('/file.txt', '2.0.0')]
>>> interface.ls(pattern="archive.*")
[('/sub/archive.zip', '1.0.0')]
>>> interface.ls("/sub/")
[('/sub/archive.zip', '1.0.0')]

move_file()

Versioned.move_file(src_path, dst_path, *, version=None, validate=False, verbose=False)[source]

Move file on backend.

If version is None all versions of src_path will be moved.

If dst_path exists and has a different checksum, it is overwritten. Otherwise, src_path is removed and the operation silently skipped.

If validate is set to True, a final check is performed to assert that src_path and dst_path have the same checksum. If it fails, dst_path is removed and an InterruptedError is raised. To ensure src_path still exists in this case it is first copied and only removed when the check has successfully passed.

Parameters

  • src_path (str) – source path to file on backend

  • dst_path (str) – destination path to file on backend

  • version (Optional[str]) – version string

  • validate (bool) – verify file was successfully moved

  • verbose (bool) – show debug messages

Raises

  • BackendError – if an error is raised on the backend

  • InterruptedError – if validation fails

  • ValueError – if src_path or dst_path does not start with '/', ends on '/', or does not match '[A-Za-z0-9/._-]+'

  • ValueError – if version is empty or does not match '[A-Za-z0-9._-]+'

  • RuntimeError – if backend was not opened

Examples

>>> file = "src.txt"
>>> interface.put_file(file, "/file.txt", "1.0.0")
>>> interface.exists("/move.txt", "1.0.0")
False
>>> interface.move_file("/file.txt", "/move.txt", version="1.0.0")
>>> interface.exists("/move.txt", "1.0.0")
True
>>> interface.exists("/file.txt", "1.0.0")
False

owner()

Versioned.owner(path, version)[source]

Owner of file on backend.

If the owner of the file cannot be determined, an empty string is returned.

Parameters

  • path (str) – path to file on backend

  • version (str) – version string

Return type

str

Returns

owner

Raises

  • BackendError – if an error is raised on the backend, e.g. path does not exist

  • ValueError – if path does not start with '/', ends on '/', or does not match '[A-Za-z0-9/._-]+'

  • ValueError – if version is empty or does not match '[A-Za-z0-9._-]+'

  • RuntimeError – if backend was not opened

Examples

>>> file = "src.txt"
>>> interface.put_file(file, "/file.txt", "1.0.0")
>>> interface.owner("/file.txt", "1.0.0")
'doctest'

put_archive()

Versioned.put_archive(src_root, dst_path, version, *, files=None, tmp_root=None, validate=False, verbose=False)[source]

Create archive and put on backend.

The archive type is derived from the extension of dst_path. See audeer.create_archive() for supported extensions.

The operation is silently skipped, if an archive with the same checksum already exists on the backend.

If validate is set to True, a final check is performed to assert that the local archive and dst_path have the same checksum. If it fails, dst_path is removed and an InterruptedError is raised.

Parameters

  • src_root (str) – local root directory where files are located. By default, all files below src_root will be included into the archive. Use files to select specific files

  • dst_path (str) – path to archive on backend

  • version (str) – version string

  • files (Union[str, Sequence[str], None]) – file(s) to include into the archive. Must exist within src_root

  • tmp_root (Optional[str]) – directory under which archive is temporarily created. Defaults to temporary directory of system

  • validate (bool) – verify archive was successfully put on the backend

  • verbose (bool) – show debug messages

Raises

  • BackendError – if an error is raised on the backend

  • FileNotFoundError – if src_root, tmp_root, or one or more files do not exist

  • InterruptedError – if validation fails

  • NotADirectoryError – if src_root is not a folder

  • RuntimeError – if dst_path does not end with zip or tar.gz or a file in files is not below root

  • ValueError – if dst_path does not start with '/', ends on '/', or does not match '[A-Za-z0-9/._-]+'

  • ValueError – if version is empty or does not match '[A-Za-z0-9._-]+'

  • RuntimeError – if backend was not opened

Examples

>>> file = "src.txt"
>>> interface.exists("/sub/archive.tar.gz", "1.0.0")
False
>>> interface.put_archive(".", "/sub/archive.tar.gz", "1.0.0")
>>> interface.exists("/sub/archive.tar.gz", "1.0.0")
True

put_file()

Versioned.put_file(src_path, dst_path, version, *, validate=False, verbose=False)[source]

Put file on backend.

The operation is silently skipped, if a file with the same checksum already exists on the backend.

If validate is set to True, a final check is performed to assert that src_path and dst_path have the same checksum. If it fails, dst_path is removed and an InterruptedError is raised.

Parameters

  • src_path (str) – path to local file

  • dst_path (str) – path to file on backend

  • version (str) – version string

  • validate (bool) – verify file was successfully put on the backend

  • verbose (bool) – show debug messages

Returns

file path on backend

Raises

Examples

>>> file = "src.txt"
>>> interface.exists("/file.txt", "3.0.0")
False
>>> interface.put_file(file, "/file.txt", "3.0.0")
>>> interface.exists("/file.txt", "3.0.0")
True

remove_file()

Versioned.remove_file(path, version)[source]

Remove file from backend.

Parameters

  • path (str) – path to file on backend

  • version (str) – version string

Raises

  • BackendError – if an error is raised on the backend, e.g. path does not exist

  • ValueError – if path does not start with '/', ends on '/', or does not match '[A-Za-z0-9/._-]+'

  • ValueError – if version is empty or does not match '[A-Za-z0-9._-]+'

  • RuntimeError – if backend was not opened

Examples

>>> file = "src.txt"
>>> interface.put_file(file, "/file.txt", "1.0.0")
>>> interface.exists("/file.txt", "1.0.0")
True
>>> interface.remove_file("/file.txt", "1.0.0")
>>> interface.exists("/file.txt", "1.0.0")
False

repository

Versioned.repository

Repository name.

Returns

repository name

Examples

>>> interface.repository
'repo'

sep

Versioned.sep

File separator on backend.

Returns

file separator

Examples

>>> interface.sep
'/'

split()

Versioned.split(path)

Split path on backend into sub-path and basename.

Parameters

path (str) – path containing Backend.sep as separator

Return type

tuple[str, str]

Returns

tuple containing (root, basename)

Raises

ValueError – if path does not start with '/' or does not match '[A-Za-z0-9/._-]+'

Examples

>>> interface.split("/")
('/', '')
>>> interface.split("/file.txt")
('/', 'file.txt')
>>> interface.split("/sub/")
('/sub/', '')
>>> interface.split("/sub//file.txt")
('/sub/', 'file.txt')

versions()

Versioned.versions(path, *, suppress_backend_errors=False)[source]

Versions of a file.

Parameters

  • path (str) – path to file on backend

  • suppress_backend_errors (bool) – if set to True, silently catch errors raised on the backend and return an empty list

Return type

list[str]

Returns

list of versions in ascending order

Raises

  • BackendError – if suppress_backend_errors is False and an error is raised on the backend, e.g. path does not exist

  • ValueError – if path does not start with '/', ends on '/', or does not match '[A-Za-z0-9/._-]+'

  • RuntimeError – if backend was not opened

Examples

>>> file = "src.txt"
>>> interface.put_file(file, "/file.txt", "1.0.0")
>>> interface.put_file(file, "/file.txt", "2.0.0")
>>> interface.versions("/file.txt")
['1.0.0', '2.0.0']