datalad.api.rev_save(path=None, message=None, dataset=None, version_tag=None, recursive=False, recursion_limit=None, updated=False, message_file=None, to_git=None)

Save the current state of a dataset

Saving the state of a dataset records changes that have been made to it. This change record is annotated with a user-provided description. Optionally, an additional tag, such as a version, can be assigned to the saved state. Such tag enables straightforward retrieval of past versions at a later point in time.


Save any content underneath the current directory, without altering any potential subdataset (use –recursive for that):

% datalad save .

Save any modification of known dataset content, but leave untracked files (e.g. temporary files) untouched:

% dataset save -d <path_to_dataset>

Tag the most recent saved state of a dataset:

% dataset save -d <path_to_dataset> --version-tag bestyet


For performance reasons, any Git repository without an initial commit located inside a Dataset is ignored, and content underneath it will be saved to the respective superdataset. DataLad datasets always have an initial commit, hence are not affected by this behavior.

  • path (sequence of str or None, optional) – path/name of the dataset component to save. If given, only changes made to those components are recorded in the new state. [Default: None]
  • message (str or None, optional) – a description of the state or the changes made to a dataset. [Default: None]
  • dataset (Dataset or None, optional) – “specify the dataset to save. [Default: None]
  • version_tag (str or None, optional) – an additional marker for that state. Every dataset that is touched will receive the tag. [Default: None]
  • recursive (bool, optional) – if set, recurse into potential subdataset. [Default: False]
  • recursion_limit (int or None, optional) – limit recursion into subdataset to the given number of levels. [Default: None]
  • updated (bool, optional) – if given, only saves previously tracked paths. [Default: False]
  • message_file (str or None, optional) – take the commit message from this file. This flag is mutually exclusive with -m. [Default: None]
  • to_git (bool, optional) – flag whether to add data directly to Git, instead of tracking data identity only. Usually this is not desired, as it inflates dataset sizes and impacts flexibility of data transport. If not specified - it will be up to git-annex to decide, possibly on .gitattributes options. Use this flag with a simultaneous selection of paths to save. In general, it is better to pre-configure a dataset to track particular paths, file types, or file sizes with either Git or git- annex. See [Default: None]
  • on_failure ({'ignore', 'continue', 'stop'}, optional) – behavior to perform on failure: ‘ignore’ any failure is reported, but does not cause an exception; ‘continue’ if any failure occurs an exception will be raised at the end, but processing other actions will continue for as long as possible; ‘stop’: processing will stop on first failure and an exception is raised. A failure is any result with status ‘impossible’ or ‘error’. Raised exception is an IncompleteResultsError that carries the result dictionaries of the failures in its failed attribute. [Default: ‘continue’]
  • proc_post – Like proc_pre, but procedures are executed after the main command has finished. [Default: None]
  • proc_pre – DataLad procedure to run prior to the main command. The argument a list of lists with procedure names and optional arguments. Procedures are called in the order their are given in this list. It is important to provide the respective target dataset to run a procedure on as the dataset argument of the main command. [Default: None]
  • result_filter (callable or None, optional) – if given, each to-be-returned status dictionary is passed to this callable, and is only returned if the callable’s return value does not evaluate to False or a ValueError exception is raised. If the given callable supports **kwargs it will additionally be passed the keyword arguments of the original API call. [Default: None]
  • result_renderer ({'default', 'json', 'json_pp', 'tailored'} or None, optional) – format of return value rendering on stdout. [Default: None]
  • result_xfm ({'datasets', 'successdatasets-or-none', 'paths', 'relpaths', 'metadata'} or callable or None, optional) – if given, each to-be-returned result status dictionary is passed to this callable, and its return value becomes the result instead. This is different from result_filter, as it can perform arbitrary transformation of the result value. This is mostly useful for top- level command invocations that need to provide the results in a particular format. Instead of a callable, a label for a pre-crafted result transformation can be given. [Default: None]
  • return_type ({'generator', 'list', 'item-or-list'}, optional) – return value behavior switch. If ‘item-or-list’ a single value is returned instead of a one-item return value list, or a list in case of multiple return values. None is return in case of an empty list. [Default: ‘list’]