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tutor/docs/dev.rst

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.. _development:
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Using Tutor for Open edX development
====================================
In addition to running Open edX in production, you can use the docker containers for local development. This means you can hack on Open edX without setting up a Virtual Machine. Essentially, this replaces the devstack provided by edX.
Run a local development webserver
---------------------------------
::
tutor dev runserver lms # Access the lms at http://localhost:8000
tutor dev runserver cms # Access the cms at http://localhost:8001
Open a bash shell
-----------------
::
tutor dev shell lms
tutor dev shell cms
Point to a local edx-platform
-----------------------------
If you have one, you can point to a local version of `edx-platform <https://github.com/edx/edx-platform/>`_ on your host machine. To do so, pass a ``-P/--edx-platform-path`` option to the commands. For instance::
tutor dev shell lms --edx-platform-path=/path/to/edx-platform
If you don't want to rewrite this option every time, you can instead define the environment variable::
export TUTOR_EDX_PLATFORM_PATH=/path/to/edx-platform
All development commands will then automatically mount your local repo.
**Note:** containers are built on the Ironwood release. If you are working on a different version of Open edX, you will have to rebuild the ``openedx`` docker images with the version. See the ":ref:`fork edx-platform <edx_platform_fork>`.
Prepare the edx-platform repo
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In order to run a fork of edx-platform, dependencies need to be properly installed and assets compiled in that repo. To do so, run::
export TUTOR_EDX_PLATFORM_PATH=/path/to/edx-platform
tutor dev run lms npm install
tutor dev run lms pip install --requirement requirements/edx/development.txt
tutor dev run lms python setup.py install
tutor dev run lms openedx-assets build
Debug edx-platform
~~~~~~~~~~~~~~~~~~
To debug a local edx-platform repository, add a ``import pdb; pdb.set_trace()`` breakpoint anywhere in your code and run::
tutor dev runserver lms --edx-platform-path=/path/to/edx-platform
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Customised themes
-----------------
With Tutor, it's pretty easy to develop your own themes. Start by placing your files inside the ``env/build/openedx/themes`` directory. For instance, you could start from the ``edx.org`` theme present inside the ``edx-platform`` repository::
cp -r /path/to/edx-platform/themes/edx.org $(tutor config printroot)/env/build/openedx/themes/
Then, run a local webserver::
tutor dev runserver lms
The LMS can then be accessed at http://localhost:8000.
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Then, follow the `Open edX documentation to apply your themes <https://edx.readthedocs.io/projects/edx-installing-configuring-and-running/en/latest/configuration/changing_appearance/theming/enable_themes.html#apply-a-theme-to-a-site>`_. You will not have to modify the ``lms.env.json``/``cms.env.json`` files; just follow the instructions to add a site theme in http://localhost:8000/admin (starting from step 3).
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Watch the themes folders for changes (in a different terminal)::
tutor dev watchthemes
Make changes to some of the files inside the theme directory: the theme assets should be automatically recompiled and visible at http://localhost:8000.
Assets management
-----------------
Assets building and collecting is made more difficult by the fact that development settings are `incorrectly loaded in Ironwood <https://github.com/edx/edx-platform/pull/18430/files>`_. This should be fixed in the next Open edX release. Meanwhile, do not run ``paver update_assets`` while in development mode. When working locally on a theme, build assets by running in the container::
openedx-assets build
Alternatively, run from the host::
tutor dev run lms openedx-assets build
This command will take quite some time to run. You can speed up this process by running only part of the full build. Run ``openedx-assets -h`` for more information.
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Running python commands
-----------------------
These commands will open a python shell in the lms or the cms::
tutor dev run lms python
tutor dev run cms python
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You can then import edx-platform and django modules and execute python code.
Custom edx-platform settings
----------------------------
By default, tutor settings files are mounted inside the docker images at ``/openedx/edx-platform/lms/envs/tutor/`` and ``/openedx/edx-platform/cms/envs/tutor/``. In the various ``dev`` commands, the default ``edx-platform`` settings module is set to ``tutor.development`` and you don't have to do anything to set up these settings.
If, for some reason, you want to use different settings, you will need to pass the ``-S/--edx-platform-settings`` option to each command. Alternatively, you can define the ``TUTOR_EDX_PLATFORM_SETTINGS`` environment variable.
For instance, let's assume you have created the ``/path/to/edx-platform/lms/envs/mysettings.py`` and ``/path/to/edx-platform/cms/envs/mysettings.py`` modules. These settings should be pretty similar to the following files::
$(tutor config printroot)/env/apps/openedx/tutor/lms/development.py
$(tutor config printroot)/env/apps/openedx/tutor/cms/development.py
Alternatively, the ``mysettings.py`` files can import the tutor development settings::
# Beginning of mysettings.py
from .tutor.development import *
You should then specify the settings to use on the host::
export TUTOR_EDX_PLATFORM_SETTINGS=mysettings
From then on, all ``dev`` commands will use the ``mysettings`` module. For instance::
tutor dev runserver lms --edx-platform-path=/path/to/edx-platform