buck2-rule-basics

Buck2 rules define build logic by combining actions, artifacts, and targets. This tutorial guides you through writing your first rule step-by-step, teaching you rule syntax, how actions transform inputs, and how to configure outputs so you can automate custom build processes.

In Buck2, rules define build logic, actions execute commands, artifacts are the outputs produced, and targets are named build goals. Understanding these core concepts and how they interconnect is essential for writing effective build rules and structuring your build model.

The select() function in Buck2 lets you conditionally choose values based on configuration flags. This interactive tutorial teaches you when and how to apply select() to make your rules adapt to different build configurations and environments.

Yes. This hands-on tutorial is designed for developers transitioning from other build systems. It bridges your existing build knowledge by teaching Buck2-specific concepts like rules, actions, and the Buck2 build model through practical, guided steps.

You need Buck2 and Python 3 installed. The tutorial is an eight-step interactive walkthrough that builds progressively, so no prior Buck2 experience is required—just a working environment and readiness to practice hands-on.

The interactive tutorial progresses through eight steps at your own pace, assessing your understanding at each stage and providing immediate feedback. Most learners complete it in under an hour, depending on how deeply you explore each concept.