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Contributing to Sceptre

Thanks for your interest in Sceptre! We greatly appreciate any contributions to the project.

Code of Conduct

This project adheres to the Contributor Covenant code of conduct. By participating, you are expected to uphold this code. Please report unacceptable behaviour to [email protected].

How to Contribute

Report Bugs

Before submitting a bug, please check our issues page to see if it's already been reported.

When reporting a bug, fill out the required template, and please include as much detail as possible as it helps us resolve issues faster.

Enhancement Proposal

Enhancement proposals should:

  • Use a descriptive title.
  • Provide a step-by-step description of the suggested enhancement.
  • Provide specific examples to demonstrate the steps.
  • Describe the current behaviour and explain which behaviour you expected to see instead.
  • Keep the scope as narrow as possible, to make it easier to implement.

Contributing Code

Contributions should be made in response to a particular GitHub Issue. We find it easier to review code if we've already discussed what it should do, and assessed if it fits with the wider codebase.

Beginner friendly issues are marked with the beginner friendly tag. We'll endeavour to write clear instructions on what we want to do, why we want to do it, and roughly how to do it. Feel free to ask us any questions that may arise.

A good pull request:

  • Is clear.
  • Works across all supported version of Python.
  • Complies with the existing codebase style (flake8, pylint).
  • Includes docstrings and comments for unintuitive sections of code.
  • Includes documentation for new features.
  • Includes tests cases that demonstrates the previous flaw that now passes with the included patch, or demonstrates the newly added feature. Tests should have 100% code coverage.
  • Is appropriately licensed (Apache 2.0).

Please keep in mind:

  • The benefit of contribution must be compared against the cost of maintaining the feature, as maintenance burden of new contributions are usually put on the maintainers of the project.

Get Started

  1. Fork the sceptre repository on GitHub.

  2. Clone your fork locally

$ git clone [email protected]:<github_username>/sceptre.git
  1. Install Sceptre for development (we recommend you use a virtual environment)
   $ cd sceptre/
   $ pip install -r requirements.txt
   $ pip install -e .
  1. Create a branch for local development:
$ git checkout -b <branch-name>

  1. When you're done making changes, check that your changes pass linting, unit tests and have sufficient coverage and integration tests pass:

    Check linting:

$ make lint

Run unit tests or coverage in your current environment - (handy for quickly running unit tests):

$ make test $ make coverage

Note: Sceptre aims to be compatible with Python 2 & 3, please run unit test against both versions. You will need the corresponding versions of Python installed on your system.

Run unit tests and coverage using tox for Python 2.7 and 3.6:

$ tox -e py27 $ tox -e py36

If you use pyenv to manage Python versions, try pip install tox-pyenv to make tox and pyenv play nicely.

Run integration tests:

If you haven't setup your local environment or personal CircleCI account to run integration tests then follow these steps:

To run on CircleCi (please do this before submitting your PR so we can see that your tests are passing):

  • Login to CircleCi using your Github Account.
  • Click Add Projects, you will be presented with a list of projects from your GitHub Account.
  • On your sceptre fork press the Set Up Project button.
  • You can ignore the setup steps, we already have a CircleCi config file in Sceptre. Click "Start Building".
  • Modify the Project Settings, which can be found by navigating: Builds -> Sceptre and selecting the Settings icon, on the right hand side of the page.
  • Once in the Project Settings section under Permissions select AWS Permissions.
  • Add your Access Key ID and Secret Access Key that is associated with an IAM User from your AWS account. The IAM User will require "Full" permissions for CloudFormation and S3 and Write permissions for STS (AssumeRole).

Once you have set up CircleCi any time you commit to a branch in your fork all tests will be run, including integration tests.

You can also (optionally) run the integration tests locally, which is quicker during development.

To run integration tests locally pip install behave in your sceptre virtualenv and run:

$ behave integration-tests

or to run a specific tests:

$ behave-integration-tests -n "scenario-name"

Note: you will need to make sure you have installed and configured awscli to work with an AWS account that you have access to. You can use the same user that you use for CircleCi.

  1. Make sure the changes comply with the pull request guidelines in the section on Contributing Code.

  2. Commit and push your changes.

    Commit messages should follow these guidelines

    Use the following commit message format [Resolves #issue_number] Short description of change.

    e.g. [Resolves #123] Fix description of resolver syntax in documentation

  3. Submit a pull request through the GitHub website.

Credits

This document took inspiration from the CONTRIBUTING files of the Atom and Boto3 projects.