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Filename Latest commit message Latest commit date
atlas 270430a4b4 docs(swarm): facts + structure pass 
swarm/README.md opens with the swarm and its control plane; hive identity
and the directory follow as the substrate. Upgrade notes move into a
<details> block, the per-agent queue publishing detail into another, and
the one-paragraph pointer sections collapse into a link list.

Fact fixes, checked against origin/main:
- an empty swarm.hives fails eval (swarm.nix:341-354); it does not mean
  "not in a swarm"
- swarm.domain is required with a hive (hive-network.nix:156,188), hiveName
  with a hive, store or homeserver (hyperhive.nix:161-166)
- the matrix container trusts the hive's trust-bundle.pem at runtime under
  self-signed certs (hive-matrix.nix:1046-1052, lib/hive-ca-trust.nix:76-85)
- singleHostSwarm also defaults the controller, localHostsEntry, the nats
  callout keys and the bao bootstrap token path (local-defaults.nix:72-129)
- swarm-controller serves far more than /health: roster, wanted state, job
  graph, agent creation and credential mints (main.rs:2874-2899)
- swarmctl user add needs --email for the forge account and refuses an
  existing user (setup.md:67-71, swarmctl/src/main.rs:425-430); document
  agent mint-identity and mint-forge-token
- agent creation also mints store identity, forge token and matrix
  account, and declares the agent paused (main.rs:1822-1920, 247-248)

Refs #3902
2026-10-02 12:50:34 +02:00
..
src forge: external forge accounts live in swarm bao; the agent fetches them itself 2026-10-01 18:05:33 +02:00
Cargo.toml swarm-controller: first credential-renewal pass waits for the queue connection 2026-09-30 15:46:56 +02:00
README.md docs(swarm): facts + structure pass 2026-10-02 12:50:34 +02:00

README.md

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

The swarm's control plane. The swarm UI and swarmctl are its clients.

  • Hive directory — serves swarm.hives (GET /api/hives) and what each hive last published about itself (GET /api/hives/status).
  • Agent roster and wanted state — every agent the swarm knows (GET /api/agents, /api/agents/status), and the state it declares for each one on its hive (up/offline/paused/destroyed, PUT /api/hives/{hive}/agents/{agent}/state).
  • Job graph — a hive-jobq scheduler, served at GET /api/jobq/graph. Every provisioning step below runs as a node in it.
  • Agent creation — POST /api/agents queues the SSO identity (through swarm-authelia-bridge), forge user, config repo, store identity, forge token and matrix account, declares the agent paused, then sends its hive a deploy message.
  • Agent credentials — at start and every five minutes it re-checks every agent's forge token and matrix account, and renews store certificates and queue secrets as they age.
  • Swarm-wide forge objects and webhooks → docs/swarm/README.md.
  • Relays — each agent's terminal and turn-state header as SSE, agent icons, the cross-repo issue report, and the UI's quick links.

It reads its configuration once at startup, from the environment the nix module sets. The one file it persists is webhook-secret in its state directory. The job graph lives in memory; hive status and wanted state live in the swarm queue, so both survive a restart.

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.