.. _install:

Installing ``repo2docker``
==========================

repo2docker requires Python 3.4 and above on Linux and macOS. See
:ref:`below <windows>` for more information about Windows support.

Prerequisite: docker
--------------------

Install `Docker <https://www.docker.com>`_ as it is required
to build Docker images. The
`Community Edition <https://www.docker.com/community-edition>`_,
is available for free.

Recent versions of Docker are recommended.
The latest version of Docker, ``18.03``, successfully builds repositories from
`binder-examples <https://github.com/binder-examples>`_.
The `BinderHub <https://binderhub.readthedocs.io/>`_ helm chart uses version
``17.11.0-ce-dind``.  See the
`helm chart <https://github.com/jupyterhub/binderhub/blob/master/helm-chart/binderhub/values.yaml#L167>`_
for more details.

Installing with ``pip``
-----------------------

We recommend installing ``repo2docker`` with the ``pip`` tool::

    python3 -m pip install jupyter-repo2docker

For information on using ``repo2docker``, see :ref:`usage`.

Installing from source code
---------------------------

Alternatively, you can install repo2docker from source,
i.e. if you are contributing back to this project::

  git clone https://github.com/jupyter/repo2docker.git
  cd repo2docker
  pip install -e .

That's it! For information on using ``repo2docker``, see
:ref:`usage`.

.. _windows:

Windows support
---------------

Windows support for ``repo2docker`` is still in the experimental stage.

An article about `using Windows and the WSL`_ (Windows Subsytem for Linux or
Bash on Windows) provides additional information about Windows and docker.


.. _using Windows and the WSL: https://nickjanetakis.com/blog/setting-up-docker-for-windows-and-wsl-to-work-flawlessly

.. _jupyterhub_ready:

JupyterHub-ready images
-----------------------

JupyterHub_ allows multiple
users to collaborate on a shared Jupyter server. ``repo2docker`` can build
Docker images that can be shared within a JupyterHub deployment.  For example,
`mybinder.org <https://mybinder.org>`_ uses JupyterHub and ``repo2docker``
to allow anyone to build a Docker image of a git repository online and
share an executable version of the repository with a URL to the built image.

To build JupyterHub_-ready Docker images with ``repo2docker``, the
version of your JupterHub deployment must be included in the
``environment.yml`` or ``requirements.txt`` of the git repositories you
build.

If your instance of JupyterHub uses ``DockerSpawner``, you will need to set its
command to run ``jupyterhub-singleuser`` by adding this line in your
configuration file::

  c.DockerSpawner.cmd = ['jupyterhub-singleuser']

.. _JupyterHub: https://github.com/jupyterhub/jupyterhub