docker / buildx

Contributing to Docker Buildx

This document aims to guide developers interested in contributing to the Docker Buildx project. While there is no official contributing guide available, we can leverage the project’s structure and existing tools to navigate the process.

Understanding the Project

Docker Buildx is written primarily in Go, with supporting files in Dockerfile, Shell, HCL, and Makefile. It’s essential to understand these languages and build tools to navigate the codebase effectively.

Getting Started

  1. Fork the repository: Start by creating a fork of the official Docker Buildx repository on GitHub https://github.com/docker/buildx/. This allows you to work on your own copy of the code.
  2. Clone your fork: Clone your forked repository to your local machine using git clone <your-fork-url>.
  3. Set up development environment: Ensure you have the required tools installed, including Go and Docker. You can refer to the project’s README.md for specific instructions.
  4. Explore the codebase: Familiarize yourself with the project’s structure and the existing code. The cmd folder contains the main application logic, while pkg houses various components.

Contributing to the Project

  1. Identify an issue: Browse the project’s issues https://github.com/docker/buildx/issues to find an area where you can contribute. Look for issues labeled with “good first issue” or “help wanted” to find suitable starting points.
  2. Create a branch: Create a new branch from the main branch for your work. It’s good practice to name branches descriptively, e.g., “fix-issue-123.”
  3. Develop your solution: Implement your changes within your branch. Follow the existing coding style and ensure thorough testing.
  4. Run tests: Run the project’s test suite to verify your changes haven’t introduced regressions. The following commands can be used:
  • make test: Execute all tests.
  • make test-unit: Run unit tests.
  • make test-integration: Run integration tests.
  • make test-driver: Run tests related to the build driver.
  1. Document your changes: Write clear and concise commit messages that explain the purpose of your changes. Additionally, update documentation as necessary to reflect your contributions.
  2. Submit a pull request: Once your changes are complete and tested, create a pull request to the official Docker Buildx repository. Provide a detailed description of your changes, including any relevant context.
  3. Review and iteration: The maintainers of the project will review your pull request and may provide feedback or request changes. Be open to incorporating their feedback and iterate on your contribution until it’s deemed ready for merging.

Useful Commands and Tools

  • make build: Build the application.
  • make docs: Generate documentation.
  • make test: Run tests.
  • make validate-all: Perform validations and tests.
  • docker buildx build: Use Buildx for building images.
  • docker buildx create: Create a new builder instance.
  • docker buildx use <name>: Switch to a specific builder instance.

Remember:

  • Be respectful and collaborative in your interactions with the project maintainers and other contributors.
  • Always follow the project’s coding style and best practices.
  • Ensure your code is well-tested and documented.
  • Be patient and persistent in your contributions.

Contributing to open-source projects like Docker Buildx is a rewarding experience. By following these guidelines, you can help improve the project and learn valuable skills.