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CONTRIBUTING.md

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Contribution and Maintenance notes

Contributing

Pull Requests and issue reports are very welcome!

If you are unsure whether something would make a good contribution (or you aren't sure how to tackle something), feel free to either open an issue to solicit feedback or chat with us at #nrf-rs:matrix.org. This is preferred over opening a big PR that might then not get merged.

If a Pull Request has not been reviewed for a long time, feel free to ping the maintainers.

Breaking Changes

Since the HAL still evolves rapidly, most releases contain breaking changes, and there is generally no requirement that Pull Requests avoid them.

If some fix is intended to be included in a patch release, breaking changes should be avoided. Otherwise it can not be included in a patch release and has to wait until the next major release.

Note that we do not backport bugfixes, so once any breaking change has landed, future bug fixes, even if not breaking changes by themselves, will only be included in the next major release.

Release process

The release process requires the workspace to be setup as per when performing Continuous Integration. Please follow these steps before you begin (shown for Unix):

  1. Keep a copy of your existing Cargo.toml - mv Cargo.toml Cargo.my.toml. Note that Cargo.my.toml is ignored for the repository so it cannot be accidentally committed.
  2. Activate the CI workspace - cp Cargo.ci.toml Cargo.toml.

When finished releasing, copy or move your Cargo.my.toml back.

In order to release a new version of the HALs, the following steps need to be performed:

  • Changelog: Update the changelog to list all notable changes under the Unreleased section.
    • You can use GitHub's "compare" feature to view all commits added since the last release. Go to https://github.com/nrf-rs/nrf-hal/releases/, select the latest release, and click the link "N commits to master since this release".
  • Version Bump: Determine whether the next release contains breaking changes. This informs what kind of version bump is needed (minor vs. major). Then, bump the crate versions accordingly. Because of the large number of crates, we use cargo-xtask-based automation to bump all version numbers. Invoke it via cargo xtask bump <new-version> to update all version numbers to <new-version>.
  • Pull Request: Open a Pull Request with the version bump and merge it once CI passes.
  • Tag: Run git pull, and tag the release by running git tag -a -m 'vX.Y.Z' 'vX.Y.Z', replacing X.Y.Z with the version you bumped to. Run git push --tags origin.
  • Publish: Publish all HAL crates to crates.io, starting with nrf-hal-common. For that crate, you have to pass --no-verify to cargo publish, since the crate only builds with specific Cargo features. The examples should not be published.
  • GitHub Release: Go to https://github.com/nrf-rs/nrf-hal/releases and click the tag you just pushed. Click Edit Tag and paste the changelog entries for the new version (no Release Title is necessary). Click Publish Release.
  • Announcement: Post a link to the GitHub release in #nrf-rs:matrix.org and any other places you'd like to announce it.