What This Repository Does

Docker CE is the free, open-source version of Docker — the popular tool that lets developers package applications and run them anywhere consistently. This repository holds the code that actually builds Docker CE for Mac, Windows, Linux, and cloud platforms. Think of it as the central hub where Docker Inc. assembles all the pieces needed to ship Docker to users.

How It Works

The repo doesn't contain all the original code written from scratch. Instead, it acts as a clearinghouse that pulls in components from several specialized upstream repositories (like moby/moby for the core engine) and combines them into one unified place. Each component gets its own folder — one for the engine, another for the CLI, and so on. When it's time to release a new version of Docker CE, the team creates a snapshot branch from the master branch and uses that to package and ship the product. Bug fixes that need to go into a release get cherry-picked from upstream or applied directly to the release branch, then ported back upstream to keep everything in sync.

Who Would Use This and Why

This repository is primarily for Docker Inc.'s engineering team and open-source contributors who want to work on Docker CE itself. If you're running Docker on your Mac, Windows, or Linux machine, you're using the product this code builds — but you'd report bugs against the platform-specific repositories (for-mac, for-win, for-linux, etc.) rather than here. Developers who want to contribute improvements to Docker's core engine or understand how Docker's internals fit together would clone this repo and build from it.

What's Notable

The clever part is how this repo unifies code from multiple sources without rewriting history. Using a special tool, it imports commits from upstream repositories while preserving their original metadata, so you can trace any line of code back to where it came from. This design keeps the master branch as a clean assembly point while allowing real development to happen in specialized upstream projects. It's a solution to the common problem of coordinating work across many related but separate codebases.