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CONTRIBUTING.md

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Contributors' Guide

This guide will help familiarize contributors to the containerd/containerd repository.

Prerequisite

First read the containerd project's general guidelines around contribution which apply to all containerd projects.

Getting started

See BUILDING.md for instructions for setting up a development environment.

If you are also a new user to containerd, you can first check out the Getting started with containerd guide.

Setting up your local environment

At a minimum, the dev tools from script/setup/install-dev-tools should be installed. Run make install-deps to install dependencies used for running and developing the CRI plugin. Other install scripts under script/setup may need to be run depending on your environment and your preference for installing libraries and dependencies. The versions used by containerd/containerd CI can be found in script/setup and referred to if installing manually.

$ script/setup/install-dev-tools
$ make install-deps

Code style

  • Go files adhere to standard Go formatting and styling
  • Protobuf files use tabs for indentation
  • Other files must not contain trailing whitespace and should end with a single new line character

Use the check command in the makefile to verify your code matches the expected style.

make check

Updating protobuf files

Ensure protoc and dev tools have been installed, then run make protos

Note When running make protos, the current working directory should be found under the GOPATH environment variable to ensure protoc can properly resolve the paths of protofiles in the project.

Naming packages

Package names should be short and simple. Avoid using _ and repeating words from parent directories.

Where to put packages

Try to put a new package under the appropriate root directories. The root directory is reserved for configuration and build files, no source files will be accepted in root since containerd v2.0.

  • api - All protobuf service definitions and types used by services
  • bin - Autogenerated during build, do not check in file here
  • client - All Go files for the containerd client (formerly in containerd/containerd root in 1.x)
  • cmd - All Go main packages and the packages used only for that main package
  • contrib - Files, configurations, and packages related to external tools or libraries
  • docs - All containerd technical documentation using markdown
  • man- All containerd reference manuals used for the man command
  • pkg - All Go packages shared and used by other containerd packages.
  • plugins - All included containerd plugins which are registered via init
  • releases - All release note files
  • script - All scripts used for testing, development, and CI
  • test - Test scripts used for external end to end testing of containerd, do not add new files here
  • vendor - Autogenerated vendor files from make vendor command, do not manually edit files here
  • version - Version package with the current containerd version