potiuk opened a new pull request, #76837:
URL: https://github.com/apache/airflow/pull/76837
## Why
One of the points that cancelled the AIP-120 vote: fork CI tests the tip of
the contributor's
branch, while project CI tests the PR merged into the target branch, so a
gated PR could go
green on a stale base and merge on that result.
## What
- When a fork run turns green, the fork CI monitor compares the head commit
with the base
branch: the merge base the run tested, how many commits the base branch
has since, and which
of the PR's files the base branch changed since.
- `CI passed` is reported only when the base is fewer than 200 commits
behind and changed none
of the PR's files. Otherwise it is posted as pending with "Rebase on
<base> and push", and the
state comment lists the overlapping files and the rebase commands.
- Every green state comment and the `CI passed` description name the base
commit the run was
tested on.
- Testing the merge commit in the fork itself was considered and rejected
(every checkout of the
fork run would change, there is no merge ref before the PR exists, GitHub
recomputes it
asynchronously, and the monitor would have to trust the run's own report);
the reasons are in
the design doc's "Known limitations".
- The check runs once per head commit, like project CI's `pull_request` run,
and no paths are
exempt from the overlap check; both can be revisited if rebase churn
becomes a problem.
related: https://lists.apache.org/thread/5603zwgpj7pgj6j979hbgpr72xsjbbws
---
##### Was generative AI tooling used to co-author this PR?
- [X] Yes — Claude Code (Opus 5)
Generated-by: Claude Code (Opus 5) following [the
guidelines](https://github.com/apache/airflow/blob/main/contributing-docs/05_pull_requests.rst#gen-ai-assisted-contributions)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
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