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ckanext-envvars

This CKAN extension checks for environmental variables conforming to an expected format and updates the corresponding CKAN config settings with its value.

For the extension to correctly identify which env var keys map to the format used for the config object, env var keys should be formatted in the following way:

All uppercase
Replace periods ('.') with two underscores ('__')
Keys must begin with 'CKAN' or 'CKANEXT'

Some examples:

ckan.site_id --> CKAN__SITE_ID
ckanext.s3filestore.aws_bucket_name --> CKANEXT__S3FILESTORE__AWS_BUCKET_NAME

For keys that don't normally begin with 'CKAN', add 'CKAN___' (3 underscores) to the beginning to help the extension identify these keys, e.g.:

sqlalchemy.url --> CKAN___SQLALCHEMY__URL
beaker.session.secret --> CKAN___BEAKER__SESSION__SECRET

Starting from CKAN 2.10 (and ckanext-envvars 0.0.4), if a configuration option is defined using CKAN's configuration declaration the key is not further processed. This allows to keep eg upper case setttings like SECRET_KEY, WTF_CSRF_ENABLED, e.g:

SECRET_KEY --> CKAN___SECRET_KEY
WTF_CSRF_ENABLED --> CKAN___WTF_CSRF_ENABLED

Requirements

Tested in CKAN 2.7, CKAN 2.8, CKAN 2.9 and CKAN 2.10, but may work in other versions.

To ensure all config settings are overridden by env var values, envvars must be the last plugin entry in the ckan.plugins list (see 'Installation' below).

Installation

To install ckanext-envvars:

Activate your CKAN virtual environment, for example:
```
. /usr/lib/ckan/default/bin/activate
```
Install the ckanext-envvars Python package into your virtual environment:
```
pip install ckanext-envvars
```
Add envvars to the ckan.plugins setting in your CKAN config file (by default the config file is located at /etc/ckan/default/production.ini).
Restart CKAN. For example if you've deployed CKAN with Apache on Ubuntu:
```
sudo service apache2 reload
```

Development Installation

To install ckanext-envvars for development, activate your CKAN virtualenv and do:

git clone https://github.com/okfn/ckanext-envvars.git
cd ckanext-envvars
python setup.py develop
pip install -r dev-requirements.txt

Running the Tests

They follow the guidelines for testing CKAN extensions.

To run the tests, do:

pytest --ckan-ini=test.ini ckanext/envvars/tests.py

ckanext-envvars on PyPI

ckanext-envvars is availabe on PyPI as ckanext-envvars.

Releasing a New Version of ckanext-envvars

To release a new version of this CKAN extension you should:

Update the setup.py file with a new version number (N.N.N)
Tag this repo with the new version

git tag vN.N.N
git push --tags

Create a source distribution of the new version:

python setup.py sdist

Set up twine. The $HOME/.pypirc file must containg the following:

[pypi]
username = __token__
password = <the token value, including the `pypi-` prefix>

Upload the new version to PyPI:

pip install twine
twine check dist/*
twine upload dist/*