5. Package an addon (installation)¶
So far we have added applications by adding a module into the project directory or installing via pip.
In each case, the applications had to be configured. However, this
configuration can be automated, making it possible to create self-configuring
applications, that take care of applying the necessary settings when they are
added to a project - so you can install them without having to touch your
settings.py at all.
This is done by providing an application with an aldryn_config.py file, in which the application will check the project and
urls.py and other key configuration
settings are correct.
The Divio Cloud also allows applications to be installed into projects from the
Control Panel, selecting the version to be installed and configuring the
application - i.e. applying some settings - using a web form. This is also
handled by the same
In this section of the tutorial, we’ll start packaging Django Debug Toolbar as a Divio Cloud addon, so that it can install itself into a project.
In the examples below, pay particular attention to the use of dashes
_ in the names of files and directories.
In Python naming conventions, a package name will use dashes, as in
tutorial-django-debug-toolbar. The application name within the package will use
This is significant, because although underscores are theoretically allowed in package names,
various tools, including
pip, will silently convert them to dashes, with predictably
5.1. Register the addon¶
Before your addon can be uploaded, the Divio Cloud must be ready to receive it (just as GitHub requires you to create the repository on the platform before you can push a local repository)
Go to your addons in the Divio Control Panel and Add custom addon.
The Package Name field is the most important, and must be unique on the
system. Call it
From this point onwards for convenience we will refer to this as
tutorial-django-debug-toolbar in examples - but you need to substitute
<your name>-django-debug-toolbar, that you registered the addon with.
Every time you see “tutorial”, remember to use your own name instead.
The other fields:
<your name> Django Debug Toolbar
- Select a license for your addon
- You can leave this blank
When you hit Create addon, the addon
be registered on the system. On the next page, supply a Description for the
Tutorial Django Debug Toolbar ============================= A Divio Cloud addon to install and configure Django Debug Toolbar into Divio Cloud projects. Created as part of the Divio Cloud developer tutorial.
and hit Save once more.
5.2. Add the packaging files¶
We need to work in the project’s
addons-dev directory. Create a new
tutorial-django-debug-toolbar directory in there.
Select Package Information from your addon’s menu. From here, you’ll be able to download system-created versions of the required packaging files. Of course you can also create them yourself, but this will save you the trouble.
In the current set-up, we install the Django Debug Toolbar package manually. We still want it to be installed, but we need the addon to take care of the installation for us instead.
If you now rebuild the project and try to run it, you’ll get an error:
➜ docker-compose build web Building web [...] Successfully built 9317b86c7745 ➜ docker-compose up [...] web_1 | ImportError: No module named debug_toolbar
Instead, move the
setup.py file you downloaded to
tutorial-django-debug-toolbar to handle installation. You’ll need to make one change in it:
# -*- coding: utf-8 -*- from setuptools import setup, find_packages from tutorial_django_debug_toolbar import __version__ setup( name='tutorial-django-debug-toolbar', version=__version__, description=open('README.rst').read(), author='Django Developer', firstname.lastname@example.org', packages=find_packages(), platforms=['OS Independent'], install_requires=["django-debug-toolbar==1.8"], include_package_data=True, zip_safe=False, )
You’ll see from the
setup.py that it expects to find a version number at
from tutorial_django_debug_toolbar import __version__ setup( [...] version=__version__, [...] )
Create a new directory inside the addon, named
tutorial_django_debug_toolbar. Download and move the the
file provided by the Control Panel to the new directory.
By default it declares the version number as
0.0.1, but we recommend
tracking the version number of the application that it installs (in this case,
1.8) so change it to:
__version__ = "18.104.22.168"
(If you create another version of the addon to install
django-debug-toolbar==1.8, that would be version
22.214.171.124. For version
1.9, you’d start at
126.96.36.199 and so on.)
setup.py expects to find a README file:
setup( [...] description=open('README.rst').read(), [...] )
Download and add the
README.rst file. If you haven’t already provided a
Description via the Control Panel, it will be empty, otherwise, it will
contain the description.
5.3. Build the project with the new addon¶
We’re now ready to build the project. Check that the addon file structure looks like this:
addons-dev/ tutorial-django-debug-toolbar/ tutorial_django_debug_toolbar/ __init__.py README.rst setup.py
divio project develop tutorial-django-debug-toolbar
➜ divio project develop tutorial-django-debug-toolbar Building web [...] The package tutorial-django-debug-toolbar has been added to your local development project!
See the divio project develop reference for more.
You can test that it works by starting the project again (
divio project develop <addon> has been run, it doesn’t need to be
executed again. From this point henceforth any changes you make to the addon,
other than in its
setup.py, can be picked up automatically, even while the
project is still running.
- Adding new files may require you to restart the server.
- Changes to
setup.pywill require running
docker-compose build web.
We now have mechanism for a self-installing addon package. The next step is configuration.