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hyperhive/swarm-controller
Repository files (latest commit first)
Filename Latest commit message Latest commit date
atlas 78d8d69c7f swarm-controller: mint each hive's matrix sender token
A hive whose homeserver runs on another host has no local
matrix-appservice-token, so hive-c0re's matrix sweep returned before
reaching the store read in ensure_hive_user: no @hive-<name>: token, no
Space, no chat room, no invites, and a sweep-health banner.

swarm-controller now mints @hive-<name>: with the swarm appservice
token for every hive in its directory, as a MintHiveSenderToken job
node queued by a five-minute pass, and stores it at
swarm/hives/<name>/matrix/sender-token, the same matrix::Credential
swarm-matrix-ctl writes there. It is keep-if-live, reusing agent_token's
classify/plan: a stored token whoami confirms as @hive-<name>: is left
alone, so only an absent or dead one is minted. agent_token's probe and
mint steps are lifted into probe_at/mint_at so both passes share them.

swarm-matrix-ctl mint still writes the path for its own hive when it is
empty. If both mint an empty path at once, one token is invalidated
(same pinned device); the next pass classifies it Revoked and re-mints.

hive-c0re's ensure_all no longer returns when there is no local
as_token. ensure_hive_user reads the store first on every sweep and
overwrites its token file when the store's token differs, keeps the
file when the store has none, mints with the local as_token only when
neither holds one, and fails with one error when there is nothing at
all. The decision is sender_source, unit-tested.

The controller's bao policy gains create/read/update on
swarm/hives/+/matrix/sender-token (`+`, since `*` is a glob only at the
end of a path), pinned in module-eval.

Refs #4427
2026-09-29 22:14:40 +02:00
..
src swarm-controller: mint each hive's matrix sender token 2026-09-29 22:14:40 +02:00
Cargo.toml swarm-controller: re-issue agent certificates and re-mint queue secrets at half-life 2026-09-28 21:35:01 +02:00
README.md nix: gate hive-c0re on deploy.hive-controller.enable, drop hyperhive.enable 2026-09-26 01:19:49 +02:00

swarm-controller

The swarm-level daemon. Where hive-c0re owns the agents on one host, this owns what is true across hives — so a swarm runs one of them and most hives leave it off.

Opt-in per host via services.hyperhive.deploy.swarm-controller.enable, which is deliberately not derived from services.hyperhive.deploy.hive-controller.enable: turning it on is a statement about swarm topology, not about whether this host runs a hive.

What it does today

Serves one /health endpoint and holds no state.

That is the whole intent of the first slice. The point is to make the unit real — service user, runtime and state directories, socket, nginx reachability — so the swarm-level surfaces that follow have somewhere to land. Inventing those surfaces before they are agreed would bake in a shape nobody chose. See the hyperhive.swarm consolidation epic.

Why a unix socket, not a port

The hive-gateway's nginx is the only intended client and reaches the socket through a bind-mount. A listener that is never bound to an address cannot be reached from off-host by mistake.

The socket path is services.hyperhive.deploy.swarm-controller.socketPath, default /run/swarm-controller/controller.sock, exported to the process as SWARM_CONTROLLER_SOCKET.

⚠️ The socket's directory is its access control

The socket is 0666. It has to be: nginx runs as a different user and connect(2) needs write. This matches how hive-c0re publishes the per-agent sockets, and rests on the same argument — "the bind source dir is per-agent on host so blast radius is unchanged."

What keeps that safe is that the directory holds one socket. So:

Never point socketPath at a directory that carries anything else. /run/hyperhive above all — it holds host.sock, the host admin socket. Pointing nginx at that directory to reach this socket would put the admin socket within its reach too.

nginx is a host service, so nothing narrows what it can reach except the directory itself — that is the whole of the access control. A unit test pins the default path so a tidying edit fails instead of reviewing cleanly.

RuntimeDirectoryPreserve=yes and the daemon's stale-socket unlink on start are a pair: preserving the directory without the unlink means bind fails with EADDRINUSE after a restart.

Packaging

Built by the workspace derivation and extracted as its own package (nix build .#swarm-controller). Deliberately not in nix/packages' daemonBins — that list is the core stack and drives the bundle services.hyperhive.c0re.package points at, so folding this in would put a swarm-scoped service into every hive's closure.