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RELEASE.md

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Release management for protocol buffer specifications

This repository primary provides two features:

  • Protobuf specifications for messages used within Sigstore.
  • Language bindings for different ecosystems.

During a release, a few steps have to be synchronized to release the messages and the language clients.

Notes on semantic versioning

General information on evolving protocol buffers is described here.

Major version change

As expected this indicate a breaking change. Any major update MUST update the package name of the generated code. Examples of breaking changes are (non-complete list):

  • Deletion or rename of a field.
  • Changing the type of a field.
  • Altering the field number (NEVER DO THIS!).

Minor version change

An update which does not break the functionality of existing (older) clients. For more information on forward compatible changes in protobuf see the Language Guide.

Patch version change

Any update which does not change the behaviour. For the protocol buffer messages this is limited to only capture changes in the comments, not the messages themselves. For language bindings patch versions MAY be used for bug-fixes.

Releasing new versions of the messages

Checklist prior to releasing:

  1. Gather consensus among the community and maintainers of this repository that the messages are ready to be released. Create an issue to inform the community. The issue should describe the intended release, and any changes it introduces. The issue must be open for comments at least for a complete week (7 days).
  2. Decide the new version of this release. The releases are versioned via semver.
  3. Two of the messages, Bundle and TrustedRoot, are expected to be persisted and serialized to disk, and exchanged via other mechanisms such as the Sigstore TUF root. Therefore they contain a media_type. The media types are versioned, and so they must be updated appropriately according to semver. Each message SHOULD be versioned independently and so MAY differ from the targeted release. The media type represents the version of the message, not the release. Note that the media type does NOT capture the patch version, only major/minor.
  4. Update pyproject.toml so the version matches the targeted release.
  5. Update package.json so the version matches the targeted release.

When all of the above are set, prepare for release by creating a tag with the following pattern: vX.Y.Z and push to the repository. Bonus point if the tag is signed 🍾.

Releasing new language bindings

Go

No extra step is needed. On every commit a new Go language client is generated as part of the action workflow.

Java

Prepare a tag with the following pattern release/java/vX.Y.Z and push it. The workflow will automatically start. After the job is finished, complete the release following java release instructions.

Python

Prepare a tag with the following pattern release/python/vX.Y.Z and push it. The workflow will automatically start.

Rust

Prepare a tag with the following pattern release/rust/vX.Y.Z and push it. The workflow will automatically start.

TypeScript

Prepare a tag with the following pattern release/typescript/vX.Y.Z and push it. The workflow will automatically start.