mesh/merge-gate pass: builds build-agent, mesh-controller, route-proxy → ace, g14, novox, shanks; no bus step; every machine composes with the change as it…
Two incidents had one shape: a change took effect that nobody saw first (hq issues 241, 304).
Three guards, each silent when nothing is at stake:
- settings show [--history], and a set that answers each key it adds, changes and removes, and
refuses a removal unless --replace; the replaced or cleared layer is kept in settings_history,
in the same transaction as the write (migration 0078).
- every send keeps a summary of what it sent (no file content), plan <node> --diff compares with
it, and push with no machine is refused unless --all.
- a push that would give a running container's mount another host directory holds that machine,
naming the module, mount and both directories, until push <node> --move <module>; a named push's
cascade is held the same way.
Rebased onto main and fitted to it: the hold runs before the push says what it recreates, a whole
push still says so first and leaves machines waiting for a gate, the verb's push with no machine is
still --behind and a push still needs why. The verbs take plan diff, settings replace and history,
and push move beside a machine, each refused where it cannot take effect.
A send carries the machine's whole declaration, so at the switch to roll the next send of
anything would have carried the old default's backlog, unjudged, to every machine. A gated
send now carries and judges everything waiting on its machine; every other send is refused
or leaves the machine; a release plan walks what waits one machine at a time, the control
node last, and one that fails holds the next until a person releases it.
A build that reported applied was sent everywhere; one that then did nothing, served
no tools or broke its machine's word reached every machine. Now the first machine is
judged by the component's health (the core's definitions, as doctor probes H-*, or a
module's own) three times over two minutes within ten; a failing gate puts the previous
build back there once, marks the build, and says it as a condition and an event.
Upgrades roll out by default; the bus is a planned step; a module deleted at its
source is not built (the public-acme plan failure).
Two controllers could both act (issue 204), a reconcile's report could
overtake the apply after it and the digest decided (issue 267), and a grant
could make a second writer of a machine's report.
- The lease (internal/lease, ADR 0229): mesh-controller_lease key `holder`,
15 s age, renewed every 5 s by compare-and-set; the epoch is the revision
it was taken at. The gate is the clock (stops 3 s before expiry); a refused
renewal is a loss and the process exits; a holder that stops gives it back.
serve takes it before asserting the bus. Epochs kept in the store
(migration 0068 controller_epoch) as a floor: a bucket raised from nothing
is compacted past it. Unleased (no epoch, S12 urgent) only when nobody
holds it and the bus will not let it be written. A shell command acts
under the holder's epoch, or its own lease when none.
- Declarations carry `epoch` inside the signed envelope, only to a machine
whose latest account carried a report_sequence (mesh-host #35); would-send
is composed with the epoch last sent. Allot and the send both pass the gate.
- Reports: contract in internal/link/order.go (epoch, sequence,
report_sequence, older_than, refused_older). Accounts kept by epoch, then
sequence, then report sequence; older refused, counted; unordered reports
keep the digest rule. Plans by compare-and-set on a revision, with epoch.
Conditions and calls carry the epoch and are not written off the lease.
- S12 and S13 (naming the writer by epoch) watched, D5 run; reset of the
bucket said. Writers table compiled in and enforced in PermissionsFor; the
controller no longer publishes mesh.control.>. A contract per consumed
kind, and the empty-on-error lint over the repository.
- mesh-host pinned to its main with the epoch in the validator (D1 validates
the envelope as sent).
Needs mesh-host's genesis lock with the lease grant (mesh-host PR) for
TestTheInstallersFirstUserListIsWhatTheControllerWouldCompose.
A named push flushed every other machine whose declaration differed from
what it was last sent (hq ADR 0083). Under an upgrade policy of `record`,
or a plan still waiting on its first machine (ADR 0218), every machine
running the module differs, so `push <one>` sent the held build to all of
them (hq issue 259).
Each send now records which build of each module it carried
(node.sent_builds, migration 0061). The cascade, and the bus holder added
to a named push, skip a machine any of whose modules would move to a
build its policy records or an open plan has not sent it, and say which
module, which build, why, and that `push <node>` sends it. A machine
whose last send was not recorded is held until it is named. The named
machine itself, a whole-mesh push and `push --behind` are unchanged.
jochen