.. _installation:

==========================

Installation on Unix/Linux

==========================

The following describes three different ways of installing Kallithea:

- :ref:`installation-source`: The simplest way to keep the installation

  up-to-date and track any local customizations is to run directly from

  source in a Kallithea repository clone, preferably inside a virtualenv

  virtual Python environment.

- :ref:`installation-virtualenv`: If you prefer to only use released versions

  of Kallithea, the recommended method is to install Kallithea in a virtual

  Python environment using `virtualenv`. The advantages of this method over

  direct installation is that Kallithea and its dependencies are completely

  contained inside the virtualenv (which also means you can have multiple

  installations side by side or remove it entirely by just removing the

  virtualenv directory) and does not require root privileges.

Regardless of the installation method you may need to make sure you have

appropriate development packages installed, as installation of some of the

Kallithea dependencies requires a working C compiler and libffi library

headers. Depending on your configuration, you may also need to install

Git and development packages for the database of your choice.

For Debian and Ubuntu, the following command will ensure that a reasonable

set of dependencies is installed::

    sudo apt-get install build-essential git libffi-dev python3-dev

For Fedora and RHEL-derivatives, the following command will ensure that a

reasonable set of dependencies is installed::

    sudo yum install gcc git libffi-devel python3-devel

.. _installation-source:

Installation from repository source

-----------------------------------

To install Kallithea in a virtualenv using the stable branch of the development

repository, use the following commands in your bash shell::

        hg clone https://kallithea-scm.org/repos/kallithea -u stable

        cd kallithea

        python3 -m venv venv

        . venv/bin/activate

        pip install --upgrade pip setuptools

        pip install --upgrade -e .

        python3 setup.py compile_catalog   # for translation of the UI

.. note::

   This will install all Python dependencies into the virtualenv. Kallithea

   itself will however only be installed as a pointer to the source location.

   The source clone must thus be kept in the same location, and it shouldn't be

   updated to other revisions unless you want to upgrade. Edits in the source

   tree will have immediate impact (possibly after a restart of the service).

You can now proceed to :ref:`install-front-end`.

.. _installation-virtualenv:

Installing a released version in a virtualenv

---------------------------------------------

problematic when upgrading the system or Kallithea.

An additional benefit of virtualenv is that it doesn't require root privileges.

- Don't install as root - install as a dedicated user like ``kallithea``.

  If necessary, create the top directory for the virtualenv (like

  ``/srv/kallithea/venv``) as root and assign ownership to the user.

  Make a parent folder for the virtualenv (and perhaps also Kallithea

  configuration and data files) such as ``/srv/kallithea``. Create the

  directory as root if necessary and grant ownership to the ``kallithea`` user.

- Create a new virtual environment, for example in ``/srv/kallithea/venv``,

  specifying the right Python binary::

    python3 -m venv /srv/kallithea/venv

- Activate the virtualenv in your current shell session and make sure the

  basic requirements are up-to-date by running the following commands in your

  bash shell::

    . /srv/kallithea/venv/bin/activate

    pip install --upgrade pip setuptools

.. note:: You can't use UNIX ``sudo`` to source the ``activate`` script; it

   will "activate" a shell that terminates immediately.

- Install Kallithea in the activated virtualenv::

    pip install --upgrade kallithea

.. note:: Some dependencies are optional. If you need them, install them in

   the virtualenv too::

     pip install --upgrade kallithea python-ldap python-pam psycopg2

   This might require installation of development packages using your

   distribution's package manager.

   Alternatively, download a .tar.gz from http://pypi.python.org/pypi/Kallithea,

   extract it and install from source by running::

     pip install --upgrade .

- This will install Kallithea together with all other required

  Python libraries into the activated virtualenv.

You can now proceed to :ref:`install-front-end`.

Prepare front-end files

-----------------------

Finally, the front-end files with CSS and JavaScript must be prepared. This

depends on having some commands available in the shell search path: ``npm``

version 6 or later, and ``node.js`` (version 12 or later) available as

``node``. The installation method for these dependencies varies between

operating systems and distributions.

Prepare the front-end by running::

    kallithea-cli front-end-build

You can now proceed to :ref:`setup`.