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Load env files in your tox envs.

Project description

tox-envfile

Load env files in your tox envs.

tox-envfile reads environment variables from a file named .devdata.env in the same directory as your tox.ini file and adds them to the environment that tox runs your commands in.

This is a pretty dumb plugin for now: all of the environment variables in .devdata.env will be loaded into the environment for every tox env that you run, unconditionally. Any existing envvars with conflicting names will be overwritten. Only a single environment file is supported and it must be named .devdata.env.

env File Format

python-dotenv is used for the env file parsing.

The .devdata.env file should be an env file with contents that look like this:

# a comment that will be ignored.
REDIS_ADDRESS=localhost:6379
MEANING_OF_LIFE=42
MULTILINE_VAR="hello\nworld"

Or like this:

export S3_BUCKET=YOURS3BUCKET
export SECRET_KEY=YOURSECRETKEYGOESHERE

POSIX variable expansion works, using variables from the environment or from earlier lines in the env file:

CONFIG_PATH=${HOME}/.config/foo
DOMAIN=example.org
EMAIL=admin@${DOMAIN}

Setting up Your tox-envfile Development Environment

First you'll need to install:

  • Git. On Ubuntu: sudo apt install git, on macOS: brew install git.
  • GNU Make. This is probably already installed, run make --version to check.
  • pyenv. Follow the instructions in pyenv's README to install it. The Homebrew method works best on macOS. The Basic GitHub Checkout method works best on Ubuntu. You don't need to set up pyenv's shell integration ("shims"), you can use pyenv without shims.

Then to set up your development environment:

git clone https://github.com/hypothesis/tox-envfile.git
cd tox_envfile
make help

Releasing a New Version of the Project

  1. First, to get PyPI publishing working you need to go to: https://github.com/organizations/hypothesis/settings/secrets/actions/PYPI_TOKEN and add tox-envfile to the PYPI_TOKEN secret's selected repositories.

  2. Now that the tox-envfile project has access to the PYPI_TOKEN secret you can release a new version by just creating a new GitHub release. Publishing a new GitHub release will automatically trigger a GitHub Actions workflow that will build the new version of your Python package and upload it to https://pypi.org/project/tox-envfile.

Changing the Project's Python Versions

To change what versions of Python the project uses:

  1. Change the Python versions in the cookiecutter.json file. For example:

    "python_versions": "3.10.4, 3.9.12",
    
  2. Re-run the cookiecutter template:

    make template
    
  3. Commit everything to git and send a pull request

Changing the Project's Python Dependencies

To change the production dependencies in the setup.cfg file:

  1. Change the dependencies in the .cookiecutter/includes/setuptools/install_requires file. If this file doesn't exist yet create it and add some dependencies to it. For example:

    pyramid
    sqlalchemy
    celery
    
  2. Re-run the cookiecutter template:

    make template
    
  3. Commit everything to git and send a pull request

To change the project's formatting, linting and test dependencies:

  1. Change the dependencies in the .cookiecutter/includes/tox/deps file. If this file doesn't exist yet create it and add some dependencies to it. Use tox's factor-conditional settings to limit which environment(s) each dependency is used in. For example:

    lint: flake8,
    format: autopep8,
    lint,tests: pytest-faker,
    
  2. Re-run the cookiecutter template:

    make template
    
  3. Commit everything to git and send a pull request

Testing Manually

To test it manually you can install your local development copy of tox-envfile into the local development environment of another tox-using project such as cookiecutter-pypackage-test:

  1. Install a local development copy of cookiecutter-pypackage-test in a temporary directory:

    git clone https://github.com/hypothesis/cookiecutter-pypackage-test.git /tmp/cookiecutter-pypackage-test
    
  2. Run cookiecutter-pypackage-test's make sure command to make sure that everything is working and to trigger tox to create its .tox/.tox venv:

    make --directory "/tmp/cookiecutter-pypackage-test" sure
    
  3. Uninstall the production copy of tox-envfile from cookiecutter-pypackage-test's .tox/.tox venv:

    /tmp/cookiecutter-pypackage-test/.tox/.tox/bin/pip uninstall tox-envfile
    
  4. Install your local development copy of tox-envfile into cookiecutter-pypackage-test's .tox/.tox venv:

    /tmp/cookiecutter-pypackage-test/.tox/.tox/bin/pip install -e .
    
  5. Now cookiecutter-pypackage-test commands will use your local development copy of tox-envfile:

    make --directory "/tmp/cookiecutter-pypackage-test" test
    

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