Installation & Run
==================

Usage and publication policy
----------------------------

When using CARACal please be aware of and adhere to the `CARACal publication policy <https://docs.google.com/document/d/e/2PACX-1vTqZoKhdewnWvxvEI4C9DxI-IHP1FTCoC5Iqz_MqlX63q8UnnpcqoZvVf-sSfqACu8sA_nufkXICUH6/pub>`_.

Requirements
------------
* `Python <https://www.python.org>`_ 3.9 - 3.12. (For Python version below 3.12 if working on Ubuntu> 22.04. Install the earlier Python version through this `link <https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa>`_)
* Container technology of your choice. It can be one of the following:
    * `Docker <https://www.docker.com>`_
    * `Podman <https://podman.io>`_
    * `Singularity <https://github.com/sylabs/singularity>`_ 3.5 - 4.1 (nearly all functionality available for > 2.6.0-dist, see `here <https://github.com/caracal-pipeline/caracal/issues/1154>`_ for further information) 
        * `Apptainer <https://apptainer.org>`_ does not support all CARACal functionalities (at the moment).

============
Installation
============

We strongly recommend and describe an installation using a `Python3` virtual environment. Only try outside a virtual environment if you know what you are doing. Any name as ``${name}`` occurring in the description below can be chosen arbitrarily. If it symbolises directories or files, those directories or files should exist and the user should have **write** access.

There are three (3) available methods to install the `caracal` pipeline: 

1. Manual
---------

Choose the name of the virtual environment `${caracal-venv}`. Then:

..  code-block:: bash

    $ python3 -m venv ${caracal-venv}  # Ensure Python version is between 3.9 and 3.12.

OR, if the command above does not work

..  code-block:: bash

    virtualenv -p python3 ${caracal-venv}
    source ${caracal-venv}/bin/activate
    pip install -U pip setuptools wheel

For a CARACal stable release run:

..  code-block:: bash

    pip install -U caracal

And CARACal developer version which is not recommended for users:

..  code-block:: bash

    pip install -U 'caracal @ git+https://github.com/caracal-pipeline/caracal.git@master'


*Ignore any error messages concerning `pyregion`.*

1.1 container configuration 
---------------------------

In case you are *not* carrying out a fresh installation, remove earlier Stimela images with:

..  code-block:: bash

    stimela clean -ac


Then, if using `Docker <https://www.docker.com>`_:

..  code-block:: bash

    stimela pull

If using `Singularity <https://github.com/sylabs/singularity>`_, choose a pull folder ``${singularity_pull_folder}``, where the `Singularity <https://github.com/sylabs/singularity>`_ images are stored and define an environment variable by adding this in the rc file of your shell (e.g. .bashrc):

..  code-block:: bash

    export SINGULARITY_PULLFOLDER=${WORKSPACE_ROOT}/singularity_images

and run:

..  code-block:: bash

    stimela pull -s

If using `Podman <https://podman.io>`_:

..  code-block:: bash

  stimela pull -p 


2. `caratekit.sh` script
------------------------

Download the installation script `caratekit.sh <https://github.com/caracal-pipeline/caracal/blob/master/caratekit.sh>`_ . Choose the parent directory ``${workspace}`` and the name of the CARACal directory ``${caracal_dir}``. Any name as ``${name}`` occurring in the description below can be chosen arbitrarily. If it symbolises directories or files, those directories or files should exist and the user should have write acccess.

If using `Docker <https://www.docker.com>`_:

..  code-block:: bash

    caratekit.sh -ws ${workspace} -cr -di -ct ${caracal_dir} -rp install -f -kh


If using `Singularity <https://github.com/sylabs/singularity>`_:

..  code-block:: bash

    caratekit.sh -ws ${workspace} -cr -si -ct ${caracal_testdir} -rp install -f -kh


3. Poetry (For developers)
--------------------------

Installation from source using `poetry`. First, install poetry:

..  code-block:: bash

    pip install poetry


In the working directory where source is checked out run `poetry install` or to include all optional dependencies:

..  code-block:: bash

    poetry install

=========================================
Installation on (ILIFU) slurm environment
=========================================

The installation of CARACal on ilifu has been tried and tested on the Ubuntu 20.0 operating system, although, it should also work on other OS versions. On the login node, follow these instructions:

..  code-block:: bash

    cd /path/to/working/area
    module add python/3.9.4
    python3 -m venv <venv-name>
    source <venv-name>/bin/activate
    pip install -U pip setuptools wheel
    git clone https://github.com/caracal-pipeline/caracal.git
    pip install -U -e caracal
    deactivate

where ``/path/to/working/area`` is the actual path to the directory where you wish to install CARACal.
In principle, this can also be done in the Slurm environment of ILIFU by submitting an *sbatch* script.
Please amend your `pip install` command with `[all]` option when needed in accordance with the instructions above.
Install the latest release with:

..  code-block:: bash

    pip install -U caracal


NB: The latest version of stimela singularity images needed for CARACal are stored in this location:
``/idia/software/containers/STIMELA_IMAGES/``. For older versions, refer to the legacy directory:
``/idia/software/containers/STIMELA_IMAGES_legacy/``. 

=======