datalad.api.rev_create(path=None, initopts=None, force=False, description=None, dataset=None, no_annex=False, fake_dates=False)

Create a new dataset from scratch.

This command initializes a new dataset at a given location, or the current directory. The new dataset can optionally be registered in an existing superdataset (the new dataset’s path needs to be located within the superdataset for that, and the superdataset needs to be given explicitly via dataset). It is recommended to provide a brief description to label the dataset’s nature and location, e.g. “Michael’s music on black laptop”. This helps humans to identify data locations in distributed scenarios. By default an identifier comprised of user and machine name, plus path will be generated.

This command only creates a new dataset, it does not add existing content to it, even if the target directory already contains additional files or directories.

Plain Git repositories can be created via the no_annex flag. However, the result will not be a full dataset, and, consequently, not all features are supported (e.g. a description).

To create a local version of a remote dataset use the install() command instead.


Power-user info: This command uses git init and git annex init to prepare the new dataset. Registering to a superdataset is performed via a git submodule add operation in the discovered superdataset.

  • path (str or Dataset or None, optional) – path where the dataset shall be created, directories will be created as necessary. If no location is provided, a dataset will be created in the current working directory. Either way the command will error if the target directory is not empty. Use force to create a dataset in a non-empty directory. [Default: None]
  • initopts – options to pass to git init. Options can be given as a list of command line arguments or as a GitPython-style option dictionary. Note that not all options will lead to viable results. For example ‘–bare’ will not yield a repository where DataLad can adjust files in its worktree. [Default: None]
  • force (bool, optional) – enforce creation of a dataset in a non-empty directory. [Default: False]
  • description (str or None, optional) – short description to use for a dataset location. Its primary purpose is to help humans to identify a dataset copy (e.g., “mike’s dataset on lab server”). Note that when a dataset is published, this information becomes available on the remote side. [Default: None]
  • dataset (Dataset or None, optional) – specify the dataset to perform the create operation on. If a dataset is given, a new subdataset will be created in it. [Default: None]
  • no_annex (bool, optional) – if set, a plain Git repository will be created without any annex. [Default: False]
  • fake_dates (bool, optional) – Configure the repository to use fake dates. The date for a new commit will be set to one second later than the latest commit in the repository. This can be used to anonymize dates. [Default: False]
  • 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', 'paths', 'relpaths', 'successdatasets-or-none', '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’]