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## Why PR CI should test the exact commit that was pushed to the PR branch. By default, GitHub's `pull_request` event checks out a synthetic merge commit from `refs/pull/<number>/merge`, so the tested tree can include an implicit merge with the current base branch instead of matching the pushed head SHA. Using the PR head SHA makes each check result correspond to a concrete commit the author submitted. This also behaves better for stacked PR workflows, including Sapling stacks and other Git stack tooling: a middle PR's head commit already contains the lower stack changes in its tree, without pulling in commits above it or GitHub's temporary merge ref. ## What Changed - Set every `actions/checkout` in `pull_request` workflows under `.github/workflows` to use `github.event.pull_request.head.sha` on PR events and `github.sha` otherwise. - Updated `blob-size-policy` to compare `github.event.pull_request.base.sha` and `github.event.pull_request.head.sha`, since it no longer checks out GitHub's merge commit where `HEAD^1`/`HEAD^2` represented the PR range. ## Verification - Parsed the edited workflow YAML files with Ruby. - Checked that every checkout block in the `pull_request` workflows has the PR-head `ref`.
Workflow Strategy
The workflows in this directory are split so that pull requests get fast, review-friendly signal while main still gets the full cross-platform verification pass.
Pull Requests
bazel.ymlis the main pre-merge verification path for Rust code. It runs Bazeltestand Bazelclippyon the supported Bazel targets, including the generated Rust test binaries needed to lint inline#[cfg(test)]code.rust-ci.ymlkeeps the Cargo-native PR checks intentionally small:cargo fmt --checkcargo shearargument-comment-linton Linux, macOS, and Windowstools/argument-comment-lintpackage tests when the lint or its workflow wiring changes
Post-Merge On main
bazel.ymlalso runs on pushes tomain. This re-verifies the merged Bazel path and helps keep the BuildBuddy caches warm.rust-ci-full.ymlis the full Cargo-native verification workflow. It keeps the heavier checks off the PR path while still validating them after merge:- the full Cargo
clippymatrix - the full Cargo
nextestmatrix - release-profile Cargo builds
- cross-platform
argument-comment-lint - Linux remote-env tests
- the full Cargo
Rule Of Thumb
- If a build/test/clippy check can be expressed in Bazel, prefer putting the PR-time version in
bazel.yml. - Keep
rust-ci.ymlfast enough that it usually does not dominate PR latency. - Reserve
rust-ci-full.ymlfor heavyweight Cargo-native coverage that Bazel does not replace yet.