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@@ -16,42 +16,69 @@ For more information about the project visit: http://studyforrest.org
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How to obtain the data files
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----------------------------
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-This repository contains metadata and information on the identity of all
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-included files. However, the actual content of the (sometime large) data
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-files is stored elsewhere. To obtain any dataset component, git-annex_ is
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-required in addition to Git_.
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+This repository is a `DataLad <https://www.datalad.org/>`__ dataset. It provides
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+fine-grained data access down to the level of individual files, and allows for
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+tracking future updates up to the level of single files. In order to use
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+this repository for data retrieval, `DataLad <https://www.datalad.org>`_ is
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+required. It is a free and open source command line tool, available for all
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+major operating systems, and builds up on Git and `git-annex
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+<https://git-annex.branchable.com>`__ to allow sharing, synchronizing, and
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+version controlling collections of large files. You can find information on
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+how to install DataLad at `handbook.datalad.org/en/latest/intro/installation.html
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+<http://handbook.datalad.org/en/latest/intro/installation.html>`_.
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-1. Clone this repository to the desired location.
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-2. Enter the directory with the local clone and run::
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+Get the dataset
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+^^^^^^^^^^^^^^^
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- git annex init
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+A DataLad dataset can be ``cloned`` by running::
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- Older versions of git-annex may require you to run the following
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- command immediately afterwards::
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+ datalad clone <url>
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- git annex enableremote mddatasrc
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+Once a dataset is cloned, it is a light-weight directory on your local machine.
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+At this point, it contains only small metadata and information on the
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+identity of the files in the dataset, but not actual *content* of the
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+(sometimes large) data files.
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-Now any desired dataset component can be obtained by using the ``git annex get``
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-command. To obtain the entire dataset content run::
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+Retrieve dataset content
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+^^^^^^^^^^^^^^^^^^^^^^^^
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- git annex get .
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+After cloning a dataset, you can retrieve file contents by running::
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-Keep data up-to-date
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---------------------
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+ datalad get <path/to/directory/or/file>
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-If updates to this dataset are made in the future, update any local clone by
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-running::
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+This command will trigger a download of the files, directories, or
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+subdatasets you have specified.
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- git pull
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+DataLad datasets can contain other datasets, so called *subdatasets*. If you
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+clone the top-level dataset, subdatasets do not yet contain metadata and
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+information on the identity of files, but appear to be empty directories. In
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+order to retrieve file availability metadata in subdatasets, run::
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-followed by::
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+ datalad get -n <path/to/subdataset>
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- git annex get .
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+Afterwards, you can browse the retrieved metadata to find out about
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+subdataset contents, and retrieve individual files with ``datalad get``. If you
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+use ``datalad get <path/to/subdataset>``, all contents of the subdataset will
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+be downloaded at once.
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-to fetch all new files.
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+Stay up-to-date
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+^^^^^^^^^^^^^^^
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+DataLad datasets can be updated. The command ``datalad update`` will *fetch*
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+updates and store them on a different branch (by default
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+``remotes/origin/master``). Running::
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+ datalad update --merge
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+will *pull* available updates and integrate them in one go.
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+
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+More information
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+^^^^^^^^^^^^^^^^
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+
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+More information on DataLad and how to use it can be found in the DataLad Handbook at
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+`handbook.datalad.org <http://handbook.datalad.org/en/latest/index.html>`_. The
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+chapter "DataLad datasets" can help you to familiarize yourself with the
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+concept of a dataset.
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.. _Git: http://www.git-scm.com
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