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DEVELOPING.md

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For Developers

Releasing

Start from a clean checkout at master.

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.

Determining Semantic Version

rules_python is currently using Zero-based versioning and thus backwards-incompatible API changes still come under the minor-version digit. 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.

Steps

  1. Update version.bzl with the new semantic version X.Y.Z.
  2. Run bazel build //distro:rules_python-X.Y.Z to build the distributed tarball.
  3. Calculate the Sha256 hash of the tarball. This hash will be used in the http_archive rules that download the new release.
    1. Example command for OSX: shasum --algorithm 256 bazel-bin/distro/rules_python-0.1.0.tar.gz
  4. Update nested examples in examples/*/WORKSPACE to get the new semantic version with the new sha256 hash.
  5. Create commit called "Release X.Y.Z"
    1. "release 0.1.0" is an example commit.
  6. Tag that commit as X.Y.Z. Eg. git tag X.Y.Z
  7. Push the commit and the new tag to master.
  8. Run bazel build //distro:relnotes from within workspace and then from repo root run cat bazel-bin/distro/relnotes.txt to get the 'install instructions' that are added as release notes.
    1. Check the sha256 value matches the one you calculated earlier.
  9. "Draft a new release" in Github (manual for now), selecting the recently pushed X.Y.Z tag. Upload the release artifact from rules_python-[version].tar.gz. Also copy the relnotes.txt from step 8, adding anything extra if desired.

After release creation in Github

  1. Update README.md to point at new release.
  2. Ping @philwo to get the new release added to mirror.bazel.build. See this comment on issue #400 for more context.
  3. Announce the release in the #python channel in the Bazel slack (bazelbuild.slack.com).