`runtime_kind='microvm'` placed a mission on a KVM-capable node and then nothing
executed it: config accepted without a reader, one of the four seams this project
keeps closing. This is the reader.
`microvm_executor` — inject → run → collect → destroy, the shape copy mode
already proved for containers with a VM boundary instead of a namespace one. The
checkout goes in as a tar, the work comes back as a tar over the SAME host path,
so `mission_delivery::capture_phase_diff_at` needs no change at all.
The agent is told NOT to push, unlike the container path's session prompt. Two
reasons: delivery is already host-side and diffs the collected tree against the
recorded clone point (covering committed, staged and unstaged work in one pass),
so pushing would add a second untested way for work to arrive; and pushing would
mean forge credentials inside the VM, when the point of collecting is that the
guest never holds them.
Exactly ONE topology_runs row (tier='microvm'), mirroring launch_direct_session:
close_finished_phases, evaluation, capture and delivery all key off those rows,
and a second completion path would be a second way for a phase to finish with one
of them untested. The row and the phase flip happen BEFORE any fallible VM work,
so a missing token or a node that lost its capability shows up as a failed run an
operator can see — not a phase that stays pending and retries every ten seconds.
Fail-closed points, each the reader for a guarantee built earlier:
- credentials resolve BEFORE the VM boots, so a missing subscription token
fails the phase instead of booting a VM whose agent sits unauthenticated
- a VM reporting egress:false is REFUSED, which is what makes create's
egress/egress_host/egress_guest fields more than decoration — a turn without
egress does not fail, it hangs
- the injected checkout is PROVEN present in the guest before an agent turn is
spent on it; an inject that reports success while landing nothing would
otherwise become an agent reporting an empty repository
- work is collected even when the agent exits non-zero — a turn that failed
partway still wrote files, and a retry needs to see them
- a turn that ran but could not be collected is a FAILED phase, not a happy one
- destroy runs on every exit path, or an 8 GB sparse rootfs leaks
Two integration gaps found while wiring, both of which would have produced a
mission that completed having delivered nothing:
- `capture_finished_coding_phases` pulls work out of a CONTAINER before
capturing. A microvm mission has none, so the docker connect would fail, the
loop would `continue`, and capture would be skipped forever while the phase
sat marked completed. Its work is already collected by the executor.
- `launch_phase` provisioned a runtime container, copied the checkout into it
and wrote a runtime binding + pairing code describing a runtime nothing uses;
and the orchestrator's workspace pin — deliberately FATAL — would have failed
a microVM launch on a container it was never going to use.
461 tests pass, clippy clean.
NOT YET PROVEN END TO END: no mission has run through this path. The pieces under
it are each verified on tank (image, credentials, egress, a real agent turn), but
this executor has only been compiled and unit-tested. Deploy + one real microvm
mission is the remaining step.
Co-Authored-By: Claude Opus 5 <[email protected]>
