pantsbuild/pants

★ 3,767PythonAudience · ops devopsComplexity · 4/5Setup · moderate

Mindmap

mindmap
  root((pants))
    What it does
      Monorepo builds
      Incremental rebuilds
      Result caching
    Tech Stack
      Python
      Plugin API
    Use Cases
      Large codebase CI
      Multi-language builds
      Remote execution
    Audience
      Platform engineers
      DevOps teams

mindmap root((pants)) What it does Monorepo builds Incremental rebuilds Result caching Tech Stack Python Plugin API Use Cases Large codebase CI Multi-language builds Remote execution Audience Platform engineers DevOps teams

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Things people build with this

USE CASE 1

Speed up a large monorepo build by only rebuilding the projects affected by a specific code change.

USE CASE 2

Run tests across multiple languages in a single monorepo using one unified build command.

USE CASE 3

Cache build outputs so repeated CI runs skip unchanged modules and finish faster.

USE CASE 4

Extend the build system with a custom plugin to add a new language or deploy step to your workflow.

Tech stack

Python

Getting it running

Difficulty · moderate Time to first run · 1h+

Requires defining explicit BUILD files for each module in your monorepo, initial dependency mapping takes time in large existing codebases.

Not specified in the explanation.

In plain English

A build system is a tool that automates the process of taking source code and producing runnable software. In large projects, this involves compiling code, running tests, packaging outputs, and sometimes deploying to servers. Rather than running each of these steps by hand, a build system tracks what needs to happen and does it in the right order. Pants is a build system designed for monorepos. A monorepo is a single code repository that contains multiple projects or services, often written in different programming languages. Many companies use monorepos because they make it easier to share code across projects and keep everything coordinated. The downside is that builds across a large monorepo can become slow, because the build system has to figure out what changed and what needs to be rebuilt. Pants addresses this by tracking explicit dependencies between parts of the codebase. Instead of rebuilding everything when anything changes, it rebuilds only what is affected by a given change. It also caches results: if a piece of code was already built and its inputs have not changed, Pants reuses the previous output rather than repeating the work. This makes repeated builds faster even in very large codebases. Other features listed in the project include concurrent execution (running multiple build tasks at the same time), remote execution (offloading builds to remote machines), and a unified interface for working with multiple programming languages. Pants also has a plugin API that lets teams extend the system with custom tools or workflows. Documentation is available at the project website.

Copy-paste prompts

Prompt 1

I have a Python monorepo with 20 services and builds are slow. Walk me through setting up Pants so it only rebuilds services affected by a change to a shared library.

Prompt 2

How do I configure Pants to run pytest for all changed Python packages in a monorepo with a single command?

Prompt 3

I want to enable Pants remote execution so build tasks run on a remote cache server instead of my laptop. What does the configuration look like?

Prompt 4

I need to add a custom Pants plugin that packages a service as a Docker image. What does the plugin API look like and where do I register it?

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