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CONTRIBUTING.md

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Want to contribute? Great! First, read this page.

Before you contribute

Before we can use your code, you must sign the Google Individual Contributor License Agreement (CLA), which you can do online. The CLA is necessary mainly because you own the copyright to your changes, even after your contribution becomes part of our codebase, so we need your permission to use and distribute your code. We also need to be sure of various other things—for instance that you'll tell us if you know that your code infringes on other people's patents. You don't have to sign the CLA until after you've submitted your code for review and a member has approved it, but you must do it before we can put your code into our codebase. Before you start working on a larger contribution, you should get in touch with us first through the issue tracker with your idea so that we can help out and possibly guide you. Coordinating up front makes it much easier to avoid frustration later on.

Coding Guidelines

All code should conform to the Go style guidelines.

As a secure runtime, we need to maintain the safety of all of code included in gVisor. The following rules help mitigate issues.

Definitions for the rules below:

core:

  • //pkg/sentry/...
  • Transitive dependencies in //pkg/...

runsc:

  • //runsc/...

Rules:

  • No cgo in core or runsc. The final binary must be a statically-linked pure Go binary.

  • Any files importing "unsafe" must have a name ending in _unsafe.go.

  • core may only depend on the following packages:

    • Itself.
    • Go standard library.
      • Except (transitively) package "net" (this will result in a non-cgo binary). Use //pkg/unet instead.
    • @org_golang_x_sys//unix:go_default_library (Go import golang.org/x/sys/unix).
    • Generated Go protobuf packages.
    • @com_github_golang_protobuf//proto:go_default_library (Go import github.com/golang/protobuf/proto).
    • @com_github_golang_protobuf//ptypes:go_default_library (Go import github.com/golang/protobuf/ptypes).

  • runsc may only depend on the following packages:

    • All packages allowed for core.
    • @com_github_google_subcommands//:go_default_library (Go import github.com/google/subcommands).
    • @com_github_opencontainers_runtime_spec//specs_go:go_default_library (Go import github.com/opencontainers/runtime-spec/specs_go).

Code reviews

All changes must be submitted via Gerrit.

All submissions, including submissions by project members, require review. Please see these instructions.

The small print

Contributions made by corporations are covered by a different agreement than the one above, the [Software Grant and Corporate Contributor License Agreement] (https://cla.developers.google.com/about/google-corporate).