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RELEASING.md

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Releasing

Start from a clean checkout at main.

Before running through the release it's good to run the build and the tests locally, and make sure CI is passing. You can also test-drive the commit in an existing Bazel workspace to sanity check functionality.

Releasing from HEAD

Steps

  1. Determine the next semantic version number.
  2. Update CHANGELOG.md: replace the v0-0-0 and 0.0.0 with X.Y.0.
  3. Replace VERSION_NEXT_* strings with X.Y.0.
  4. Send these changes for review and get them merged.
  5. Create a branch for the new release, named release/X.Y 
    git branch --no-track release/X.Y upstream/main && git push upstream release/X.Y
  6. Create a tag and push: 
    git tag X.Y.0 upstream/release/X.Y && git push upstream --tags
    NOTE: Pushing the tag will trigger release automation.
  7. Release automation will create a GitHub release and BCR pull request.

Determining Semantic Version

rules_python uses semantic version, so releases with API changes and new features bump the minor, and those with only bug fixes and other minor changes bump the patch digit.

To find if there were any features added or incompatible changes made, review CHANGELOG.md and the commit history. This can be done using github by going to the url: https://github.com/bazelbuild/rules_python/compare/<VERSION>...main.

Patch release with cherry picks

If a patch release from head would contain changes that aren't appropriate for a patch release, then the patch release needs to be based on the original release tag and the patch changes cherry-picked into it.

In this example, release 0.37.0 is being patched to create release 0.37.1. The fix being included is commit deadbeef.

  1. git checkout release/0.37
  2. git cherry-pick -x deadbeef
  3. Fix merge conflicts, if any.
  4. git cherry-pick --continue (if applicable)
  5. git push upstream

If multiple commits need to be applied, repeat the git cherry-pick step for each.

Once the release branch is in the desired state, use git tag to tag it, as done with a release from head. Release automation will do the rest.

After release creation in Github

  1. Announce the release in the #python channel in the Bazel slack (bazelbuild.slack.com).

Secrets

PyPI user rules-python

Part of the release process uploads packages to PyPI as the user rules-python. This account is managed by Google; contact [email protected] if something needs to be done with the PyPI account.