When deterministic-merge produces a clean git squash but the post-squash
compile fails (typical when master gained a Stage payload field after the
feature branch forked — e.g. story 1018 hit `error[E0063]: missing field
plan` after 1010's PlanState landed), the failure is morally a merge
conflict that git's diff3 missed: the conflicting literal lives in a
different file from the type definition that changed on master. Routing
it as GatesFailed left mergemaster idle and the story stuck.
Changes:
- gates.rs GateFailureKind::classify: detect rustc compile errors
(`error[E\d+]`) as Build instead of falling through to Test. Clippy
errors (`error[clippy::...]`) still classify as Lint.
- agents/merge/mod.rs: new MergeResult::to_merge_failure_kind() method.
GateFailure with failure_kind=Build maps to ConflictDetected (so the
existing 998 subscriber auto-spawns mergemaster). Other gate failures
stay GatesFailed.
- agents/pool/pipeline/merge/runner.rs: replace the inline match with a
call to the new method.
Tests: 6 new unit tests covering the classifier branch and every
to_merge_failure_kind arm. All 2932 tests pass.
A mid-merge server restart used to silently kill the merge: the
in-flight tokio task died with the process, reap_stale_merge_jobs ran
on the new boot, saw the Running entry from the previous boot, and
simply deleted it. Mergemaster polling `get_merge_status` then saw
"Merge job disappeared", treated it as a strike, and after three
restarts escalated the story to MergeFailureFinal — even though no
real merge failure ever happened (this is what trapped story 998
during the bug 1001 iteration cycle).
Reap now also fires a `WatcherEvent::WorkItem reassign` for the
cleared story so the auto-assign watcher loop re-runs
start_merge_agent_work on the fresh boot. The story is still in
4_merge/; the merge resumes automatically. The change is contained to
the reap path — start_merge_agent_work's own behaviour is unchanged.
Added regression test
reap_stale_merge_jobs_emits_reassign_watcher_event that asserts the
new event fires. Existing
reap_stale_merge_jobs_removes_old_running_entry_without_merge still
passes (the "without_merge" guarantee is about agent spawning, not
about absence of watcher events).
Also exposes AgentPool::watcher_tx() as pub(crate) so the merge
runner can fan out re-dispatch events.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Timmy
dave