Paul Rastoin bb4e427196 ci: run upgrade mutation guard in the merge queue against main (#23216)
Follow-up to #23215 (merged). Rebased on `main`.

## Why

#23215 fixes an instance of a class of bug: an upgrade command whose
version is chosen at `generate:instance-command` time from
`TWENTY_CURRENT_VERSION`, then left behind when `main` bumps the version
before the PR merges (base-drift). The command ships one minor early and
instances already on the newer version skip it forever.

The existing `server-previous-version-upgrade-mutation-guard` in
`ci-server.yaml` runs on `pull_request`, so it validates against the
PR's base. When the base is stale (main moved after the branch was cut),
the guard reads the branch's own `TWENTY_CURRENT_VERSION` and the check
passes even though the command is now a version behind main. That is
exactly how the original bug slipped through.

## What

The version-directory and append-only-timestamp validation is extracted
into a shared composite action,
`.github/actions/upgrade-mutation-guard`, diffed against a
caller-supplied `base_sha`. It is called from two places:

- **`ci-server.yaml`** (PR-level guard, `base = pull_request.base.sha`)
for fast feedback. The job keeps its existing name/check. This replaces
~290 lines of inline shell.
- **`ci-merge-queue.yaml`** (new, `merge_group`-triggered, `base =
merge_group.base_sha`). GitHub builds each merge-queue candidate on top
of the current tip of `main`, so the checks read
`TWENTY_CURRENT_VERSION` and the existing per-directory timestamps from
main's real state at merge time.

Because the candidate is rebased onto main, base-drift is caught by
construction: the same validation simply runs where the base is
guaranteed current. No origin/main comparison hack; the logic now lives
in one place.

## Bypass semantics

The guard has two independent checks, and they are treated differently
on purpose:

- **Version-directory check** keeps its
`ci:allow-previous-version-upgrade-mutation` bypass, a deliberate,
reviewed escape hatch for legitimately touching a previous-version
directory. The PR-level guard reads the label directly; the merge-queue
guard resolves it from the queued PR (the `merge_group` event carries no
labels) and passes it to the composite action, which skips only the
version-directory step.
- **Timestamp / append-only check has no bypass.** The old
`ci:allow-upgrade-command-timestamp-exception` label is removed. A fake
or out-of-order timestamp rewinds the upgrade cursor and re-hides
already-applied columns, so there is no "allowed" version of it: the
timestamp just has to be configured correctly (real epoch millis,
strictly greater than every existing command in the same version
directory). If a blocking existing max is itself a fabricated future
timestamp, re-slot that command to its real merge epoch rather than
reaching for a bypass.

Preventing previous-version mutation is the guard's primary purpose. In
the merge queue the guard job always runs and skips only the
version-directory step when the bypass label is set, so it reports a
real success/failure (the required check never resolves to a skipped
state, and a label-lookup failure fails closed) and the timestamp check
always runs.

## Requires a settings change (not in this diff)

Enabling the merge queue and marking the check required are
branch-protection settings, not file changes. After merge, an admin
needs to:

1. Enable the merge queue for `main` in branch protection.
2. Add `CI - Merge Queue / upgrade-mutation-guard` to the merge queue's
required checks.

## Notes

- Composite action, not a `workflow_call` reusable workflow,
deliberately: converting the `ci-server.yaml` job to a reusable-workflow
call would rename its status check to
`server-previous-version-upgrade-mutation-guard / ` and break that
required-check mapping in branch protection. A composite action dedups
the logic while keeping both callers' check names intact.

---------

Co-authored-by: Paul Rastoin <paul.rastoin@gmail.com>
2026-07-24 14:37:45 +02:00
2026-07-24 14:14:44 +02:00
2026-06-11 11:02:28 +02:00

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