463 lines
24 KiB
Markdown
463 lines
24 KiB
Markdown
# Config changes + helper events
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Config changes are pull requests on the agent's config repo, which an
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operator merges on the forge; that merge deploys them. Helper events are
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how agents stay informed about lifecycle changes that need a reaction.
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## For operators
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- **Config change** — an agent proposed a change to another agent's
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config (or its own, via a sub-manager) as a pull request on
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`agent-configs/<agent>`. Review it on the forge like any other PR, and
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merge it there to deploy it. See [Config changes](#config-changes).
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Everything below this point is the implementation detail behind that
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flow.
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## Config changes
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Config changes flow through a **forge pull request** on the agent's
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`agent-configs/<name>` repo — the same surface agents use for code PRs.
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No MCP tool exists for config changes: opening the PR IS the request.
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1. The submitting agent **clones** `agent-configs/<name>`, edits it there (any
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tracked path, but `agent.nix` is the contract entry point), commits
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with its own git identity, and pushes a branch + opens a PR with
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`hive-forge` — the same way it would change any other repo.
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The bind-mounted `/agents/<name>/config/` is a **copy for reading** a
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config, not the tree to edit: authoring in place there produces no PR.
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(it's currently mounted read-write, which is a defect tracked
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separately, not an authoring path.)
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Branch protection (the agent isn't on the `main` push allowlist;
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merge and approvals allowlist = `operators` team; see "Forge config repos"
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below) makes the agent a write collaborator that **can't merge its own
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config PR**.
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2. An operator reviews the PR **on the forge** (native diff, threaded
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comments, CI status) and merges it there. Merging needs membership of
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the `operators` team in `agent-configs`. The team starts empty: add
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each operator by hand in the forge UI.
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3. swarm-controller gets the `agent-configs` org's `pull_request`
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delivery. A `closed` event with `merged: true` and base branch `main`
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names the commit in `merge_commit_sha`.
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4. The controller looks up which hive's wanted state places the agent
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and publishes a deploy request carrying that commit on that hive's
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deploy subject. With no such hive, or more than one, it deploys
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nothing and logs a warning naming them.
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5. If the hive's `applied/main` already is that commit, it does nothing.
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Otherwise it fetches the config repo's `main`. A commit that
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`applied/main` already contains is a no-op too: requests for two merges
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can arrive in either order. A commit that descends from `applied/main`
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is fast-forwarded to and a rebuild queued. A failure before the rebuild
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(the fetch, or a commit that has diverged from `applied/main`) deploys
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nothing and logs `swarm events: rev not
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applied; nothing queued` at error, which fires the Grafana alert
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`config rev refused`. An agent with no container on that hive yet ignores
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the commit; its first deploy builds what it seeds.
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This path runs **no eval-verify**. A merged config that doesn't
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evaluate or build fails the rebuild, and `applied/main` stays at that
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commit, so the agent's rebuilds keep failing until a fix merges. A
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failed rebuild shows on the hive like any other. A merge whose webhook delivery never reaches the controller
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deploys nothing.
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Creating a brand-new agent is swarm-level (`swarmctl agent create`,
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`POST /api/agents` on the swarm controller), and no hive can originate
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an agent. The swarm controller's `InitAgentConfigRepo` job seeds the
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agent's config repo with a default `agent.nix` template, then asks the
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target hive to deploy it.
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An agent created from an [archetype](../swarm/archetypes.md) gets no
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config repo: its hive builds it from the archetype's module.
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Changing what the template seeded isn't a special case: like every
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later change, it's a PR on that config repo, made from a clone and
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merged by an operator on the forge (see [Config changes](#config-changes)).
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## Agent lifecycle
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### Reminder delivery: file-path semantics
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A reminder may carry a `file_path` (the agent-visible path inside its
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container, for example `/agents/<name>/state/foo.md`). On delivery hive-c0re:
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1. **Translates** the container path to the host path
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(`/var/lib/hyperhive/agents/<name>/state/foo.md`) so c0re can write
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from outside the container.
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2. **Validates** the path: rejects anything outside the agent's own state
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subtree, containing `..` (path traversal), or with an empty relative
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tail. On rejection hive-c0re skips the write and delivers the
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original message inline with a warning — the reminder still fires.
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3. **Defends against symlink escape**: after `create_dir_all`, hive-c0re
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canonicalizes the parent dir and re-verifies it lives under the agent's host
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state root. hive-c0re opens the final file with
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`O_NOFOLLOW | O_CREAT | O_TRUNC` so an existing symlink at the
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basename can't redirect the write to an arbitrary host path.
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4. **Writes the body to disk** and delivers a short pointer message in its
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place, keeping the agent's inbox / wake-prompt small while the agent
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reads the bulky payload out of band.
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`Broker::deliver_reminders_batch` handles atomicity of the inbox INSERT + `reminders.sent_at` UPDATE; the scheduler only computes the
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body strings before calling it.
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### Destroy semantics
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`HostRequest::Destroy { name, purge }` is the lifecycle tear-down.
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Stops + removes the nspawn container and drops the systemd drop-in.
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Persistent state (proposed/applied repos, claude credentials, `/state/`
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notes) is
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**kept by default** — recreating the agent with the same name
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reuses prior config + login. With `purge = true` the agent's
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`/var/lib/hyperhive/{agents,applied}/<name>/` trees are also
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wiped (config history + creds + notes gone forever). The
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root/bootstrap container is destroyable like any other, and stays gone
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until you create ruth again from the swarm dashboard.
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## Meta flake
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A hive has no meta flake of its own. It builds every agent from the swarm's
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`internal/meta`, which swarm-controller commits ([below](#the-swarms-meta-flake)).
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It declares one flake input per agent (`agent-<n>.url =
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"git+<forge>/agent-configs/<n>.git?rev=<sha>"`, the head of `main` on the
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agent's forge config repo, the one config PRs merge into) and one
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`nixosConfigurations.<n>` output per agent. Each output wraps
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`inputs.agent-<n>.nixosModules.default` with the identity +
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`HIVE_PORT` / `HIVE_LABEL` injection module. Values that differ per host
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(the dashboard port, the pinned claude-code, extra OTEL labels, the queue
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address) aren't in it:
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`hive-priv` writes them to the container's `/etc/hyperhive-hive-facts` at
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start (see `docs/process/conventions.md`).
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A config that sits only in the hive's `applied/<n>` mirror, not on forge
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`main`, never deploys.
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What `hive-c0re` still keeps under `/var/lib/hyperhive/meta/` is plain
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state, bound read-only into the root agent's container as `/meta`:
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`topology.json`, the swarm resource limits, and the permission seed files of a
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hive that predates the swarm's permissions. `agent_set::refresh(agents:
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&[AgentSpec])` keeps `topology.json`, the gateway's agent-socket map and its
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nginx include in line with the live agents. `provision_container`, `destroy`,
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`rebuild` and the startup migration call it. It refuses an empty agent list,
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which means `nixos-container list` failed, and it fails when `HIVE_FORGE_URL`
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is unset, since every agent would come up with no forge.
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The dashboard's `deployed:<sha12>` chip per container row shows the config
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commit the agent's last successful build pinned.
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## The swarm's meta flake
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swarm-controller commits `internal/meta`: one `flake.nix` and `flake.lock` for
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every agent any hive places (the pins:
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[`docs/swarm/builder.md`](../swarm/builder.md#meta-flake-lock)). A hive builds
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every agent from it. While the repo has no commit that pins an agent's current
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config, that agent's build fails and names the agent. The controller queues
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its update of the repo before the deploy request for a merged config commit
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and for a new agent, and sends the deploy only when that update succeeded.
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- **Choosing the commit.** The rebuild's `MetaSync` node reads the repo's
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default-branch head with the hive's read token (`forge::reader_token()`)
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and takes it when its `flake.nix` builds the agent the way the agent needs now:
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a custom agent from the config commit at the head of `agent-configs/<n>`
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`main`, an archetype agent from the archetype it has now. An agent switched
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between custom and archetype, or to another archetype, fails that test.
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A hive without the forge credential file that nix's git reads, a repo with no
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commit, a head that lacks the agent and a head behind the config each fail
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the build with an error that names the agent. `MetaSync` records the commit,
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with the hyperhive and config commits the head pins, in `hive-c0re`'s own state,
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`/var/lib/hyperhive/meta-rev/<n>`, which the agent can't write (the container mounts its runtime
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directory read-write); `Prebuild` and `Swap` read that
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record, so both build one flake. A first deploy resolves the commit in its `Create`
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node, since it has no `MetaSync`.
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- **The build.** `hive-c0re` prebuilds
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`git+<forge>/internal/meta.git?rev=<commit>#nixosConfigurations.<n>…` and
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names the commit to `hive-priv` (`meta_rev` on `UpdateContainer` and
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`CreateContainer`). `hive-priv` accepts only a 40-digit lowercase hex
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commit and builds the flake from its own forge URL
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(`HIVE_PRIV_FORGE_URL`); the URL never comes from a request. On the wire the
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`hive_priv_sock::PrivRequest` variants carry a required field:
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`{"op":"update_container","name":"atlas","stream":true,"meta_rev":"<40 hex>"}`.
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- **Fetching.** nix fetches the forge's inputs with `git`. Both `hive-c0re`
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and `hive-priv` carry a `$HOME/.gitconfig` that answers for the forge host
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through `git-credential-hive-forge` (the hive's forge read token, published to
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`/run/hyperhive/forge-hive-token`) and rewrites the
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forge's `https` URL, which `internal/meta`'s lock names its inputs by, to
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`http`.
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- **Hyperhive.** The commit pins one hyperhive rev for the swarm, so an agent
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runs the hyperhive of the controller's deploy, not its hive's.
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- **Markers.** After a successful build `hive-c0re` writes the hyperhive
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commit the head pins to `applied/.<n>.hyperhive-rev`, and the config
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commit to `applied/.<n>.config-rev` (none for an archetype agent). The boot
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reconcile ([below](#autoupdate-on-startup)) and the dashboard's update chip
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read them.
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## Two repos per agent
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```
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/var/lib/hyperhive/agents/<name>/config/ proposed — parent mount is RO
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└── <anything> # any files the submitting
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# agent wants in the commit.
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# agent.nix is the
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# convention entry
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# point; flake.nix is
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# tracked boilerplate
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# (submitting agent doesn't
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# edit it).
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/var/lib/hyperhive/applied/<name>/ applied — core-only
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├── .git/ # tag-rich history
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├── flake.nix # tracked, fixed
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│ # boilerplate exporting
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│ # nixosModules.default
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├── agent.nix # working tree of main
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└── <other committed files> # also tracked
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/var/lib/hyperhive/meta/ plain hive state — core
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├── topology.json # the live agent set
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└── swarm-resource-limits.json # the swarm's per-agent caps
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```
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Why two physical repos: the submitting agent's `/agents/<n>/config/` is
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RW — a buggy or hostile agent can `git clean -fdx` its own
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proposed tree. The applied repo is never bind-mounted (except
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the read-only `.git` exposure described below) so a destructive
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move inside the container can't reach it.
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The container's `--flake` ref is `internal/meta` (see "Meta flake" above).
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The agent's own `applied/<n>/flake.nix`
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is a fixed boilerplate that exports `nixosModules.default =
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import ./agent.nix`; the meta flake imports that module and
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wraps it with identity + `HIVE_PORT` / `HIVE_LABEL`.
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### Tag state machine
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hive-c0re plants `deployed/0` on the seed commit at first spawn. A
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merged config commit that deploys plants no tag: the merged PR on the
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forge and `internal/meta`'s commits record it. A config PR nobody merges
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carries no extra state on the forge side: the PR stays open, and
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the submitter pushes again (or closes it) to retry.
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### Forge config repos
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The bundled `hive-forge` container runs on the swarm's forge host
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(`deploy.forgejo.enable`, see [`../swarm/services.md`](../swarm/services.md)).
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Every agent created through the swarm has a repo in the private
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`agent-configs` Forgejo org, created and seeded by swarm-controller.
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hive-c0re pushes nothing to it: the applied repo's tags (`deployed/0`)
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exist only locally, and forge `main` advances only by an operator's merge.
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hive-c0re reads from it — reseeding a purged `applied`
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(`forge::fetch_config_main_into_applied`), catching `applied` up, and
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seeding `proposed` at first spawn (`forge::clone_config_into_proposed`).
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A legacy agent spawned by the hive alone has no swarm-seeded repo; if its
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`agent-configs/<name>` has no `main`, a first spawn falls back to the local
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template, and reseeding a purged `applied` fails with a `destroy --purge`
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and re-spawn instruction.
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Each agent is a **write collaborator on its own** `agent-configs/<name>`
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repo — so it can push a branch and open a config PR — but not a member
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of any other agent's, so it can't reach another agent's config through
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the forge. Branch protection keeps the agent off the `main` push
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allowlist and allowlists merging to the `operators` team only, so an
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agent can't fast-forward its own config or self-merge its PR (see
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[Config changes](#config-changes) above). hive-c0re passes the credential to
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each `git` call inline, never writing it into
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`applied/<n>/.git/config`; that repo is RO-bind-mounted into the root
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agent, and a stored token would leak the hive's forge credential to an
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agent.
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The dashboard deep-links into this org — a `config repo` link
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per container row. See `docs/web-ui/dashboard.md`.
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### Submitting agent's view of config repos
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An agent holding `ManageRootAgent` has every other agent's config repo
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bind-mounted **read-only** (`hive-c0re/src/lifecycle/host_config.rs`
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calls `bind_child_agent_dirs` for each entry in
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`topology::all_agents()`). it's a copy to *read* another agent's
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current config — not an editing surface. An agent without the
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permission sees no other agent's config at all.
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An agent submits a change to another agent's config the same way it
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makes any other change: **clone the target agent's config repo from the
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forge into its own state dir, commit on a branch, open a PR**, and let
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the operator review and merge it. By design, no second, mount-shaped
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path reaches the same file without the review.
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Agents holding the `manage_root_agent` permission (granted per agent in
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the swarm's `agent-permissions` record; see
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`docs/process/conventions.md#permissions`) get additional host-side bind
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mounts via `set_nspawn_flags`:
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- `/var/lib/hyperhive/agents/` → `/agents/` (RW) — **every** agent's
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proposed repo, not just direct children. The permission means "may
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manage any agent", so the mounted set is every agent.
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- `/var/lib/hyperhive/applied/` → `/applied/` (RO) — every agent's
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authoritative applied repo, including `.git`.
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- `/var/lib/hyperhive/meta/` → `/meta/` (RO) — the hive's plain state
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(topology, swarm limits).
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An agent without the permission only has its direct children's config
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dirs.
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⚠️ nspawn bakes bind flags at container start, so hive-c0re restarts
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an agent, after its current turn, when its `manage_root_agent` changes.
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No agent holds the permission by default: an agent whose record leaves
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`permissions` unset gets the default, which doesn't include
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`manage_root_agent`, whatever the agent's name. The swarm UI's setup
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assistant creates ruth with it. For a ruth that predates that, whose
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permissions were unset, swarm-controller writes the default plus
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`manage_root_agent` into her key once at start, so she keeps her mounts;
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it never touches a key that's already set.
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Each proposed repo (`/agents/<n>/config/`) is pre-configured
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with `applied` as a git remote pointing at
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`/applied/<n>/.git`. Useful incantations from inside an agent with
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the full `/applied` mount:
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```sh
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git -C /agents/<n>/config fetch applied
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git -C /agents/<n>/config log applied/main --oneline
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git -C /agents/<n>/config show applied/refs/tags/deployed/0 # the seed commit
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git -C /agents/<n>/config show applied/refs/tags/denied/<id> # body = operator note
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git -C /agents/<n>/config rebase applied/main # base in-flight work on what's deployed
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```
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The RO binds block push at the kernel level — git plumbing inside the
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container can't corrupt either authoritative repo.
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## Startup migrations (older hosts)
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hive-c0re runs a couple of idempotent migrations on every startup so a
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host set up before the tag-driven-deploy scheme (described above)
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converges to it automatically. Each phase is a no-op
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once already applied:
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- **Tags**: hive-c0re tags agents from before the tag-driven scheme
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`deployed/0` on `main` once. Non-destructive — it doesn't touch live
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containers, state dirs, or claude creds.
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- **Agent files**: rewrites each `applied/<n>/flake.nix` to the
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module-only boilerplate, wires the `applied` remote in each proposed
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repo, and refreshes the files that follow the agent set
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(`agent_set::refresh`) from the current agent list. Set
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`HIVE_SKIP_META_MIGRATION=1` on the service to defer this phase.
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- **Legacy meta repo**: deletes the leftover `.git` in
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`/var/lib/hyperhive/meta/` and the `meta` remote in each proposed repo.
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The files beside the `.git` stay. The `core/meta` repo on the forge is
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not touched.
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No state loss in either migration: claude creds, `/state/` notes, the
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events DB, and both proposed + applied history all survive. The root
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agent keeps its session; sub-agents stay logged in.
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## The root/bootstrap container
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The root agent container runs through the **same lifecycle as
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sub-agents**. Nothing creates it at hive boot: you create ruth from the
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swarm dashboard like any agent, and an existing ruth container starts with
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the hive like every other. The root agent's flake lives at
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`/var/lib/hyperhive/applied/ruth/`; its proposed config at
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`/var/lib/hyperhive/agents/ruth/config/`. The root agent can edit its own
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`agent.nix` (visible inside the container at `/agents/ruth/config/`)
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and open a config PR on `agent-configs/ruth` for operator review,
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same as any other agent.
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Differences from sub-agents:
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- Reference docs: her `agent.nix` turns on `services.hyperhive.agent.docs.enable`.
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Her container builds from `agent-base` like every agent, and the seeded
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`agent.nix` is the same for every name, so a newly created ruth has no docs
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until a config PR adds that line.
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- Web UI port via `lifecycle::agent_web_port("ruth")` — same
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FNV-1a hash as every other agent (8100..8999 range).
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- The root agent holds `manage_root_agent` (the swarm UI's setup
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assistant creates her with it), for which `set_nspawn_flags` adds two extra binds:
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`/var/lib/hyperhive/agents` → `/agents` (RW) so the root agent can edit
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per-agent proposed repos,
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and `/var/lib/hyperhive/applied` → `/applied` (RO) so the root agent
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can `git fetch` deployed/failed/denied tags from any agent's
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authoritative applied repo (see "Root-agent view of applied" below).
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- Its socket comes from the generic per-agent registration, in the same
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per-agent runtime dir as any other agent (`/run/hyperhive/agents/ruth/`),
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not a special manager-only path.
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**Migration note** (for older hosts): drop any `containers.root =
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{ ... }` block from your host NixOS config, and any `services.hyperhive.ruthless`
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definition, then create ruth from the swarm dashboard.
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## Root-agent policy
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The system prompt (`hive-agent/prompts/system.md`, rendered by
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`hive-agent/src/prompt.rs`) is the **same for every agent**; what
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varies is which MCP tools it surfaces (gated by the agent's permissions,
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which the swarm sets). No `role:manager` block renders only
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for the root agent. The root agent's role-specific
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behaviour comes from its AGENTS.md / agent-specific instructions, not
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the system prompt template.
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## Helper events
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`hive_sh4re::manager::HelperEvent` is the wire type for an event urgent
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enough to drive an immediate claude turn (delivered as a regular
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`system` inbox message, same `recv` path as any other message). It
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currently has one variant, `NeedsUpdate { agent }` (sub-agent's
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recorded flake rev is stale, operator rebuilds from the dashboard) —
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and nothing in the tree constructs it; this removal dropped the push path
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(`Coordinator::notify_agent`) once its last caller
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(`notify_manager`, used only for the crash event below) went away.
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`HelperEvent` stays as the type for whatever comes along that
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genuinely needs to interrupt an agent's turn loop, not because
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anything live uses it today.
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**A previously-running container crashing** used to be exactly that
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case (`ContainerCrash`, routed to the root agent via
|
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`Coordinator::notify_manager`) — it no longer drives any agent turn at
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all. `crash_watch` now only `tracing::warn!`s `"container crash
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|
detected"`; a swarm-level grafana alert matches that log line directly
|
|
and pages the operator, with no agent (and no per-hive dashboard
|
|
banner) in the loop. See
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[`docs/scheduler/observability.md`](../scheduler/observability.md#container-crash-alerting-hive-c0re).
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The remaining lower-urgency lifecycle notices — `Rebuilt`, `Killed`,
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`Destroyed`, `NeedsLogin`, `LoggedIn` — are "FYI, check
|
|
when convenient" events with no reason to drive an immediate turn, so
|
|
they go out via `swarm_notices::notify` instead
|
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of a `HelperEvent`: `subsystem = "core"`, `key = "<event>:<agent>"`,
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and a single free-text `summary` (`rebuilt_todo_summary` renders
|
|
`Rebuilt`'s `ok`/`note`/`sha`/`tag` fields into that string).
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To add a new lifecycle notice: if it's "FYI, check when convenient,"
|
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call `swarm_notices::notify` — no new wire type needed. If it needs to
|
|
drive an immediate turn, decide first whether it actually needs an
|
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*agent* in the loop at all (the crash case above didn't, once a
|
|
swarm-level alert could carry the same signal) — only reach for a new
|
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`HelperEvent` variant + `notify_agent`-equivalent call site +
|
|
`prompts/system.md` update when the answer is yes.
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## Autoupdate on startup
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|
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`hive-c0re serve` runs `auto_update::run` in a background task right
|
|
after opening the coordinator. It enumerates managed containers and
|
|
rebuilds any whose recorded hyperhive rev differs from the one
|
|
`internal/meta` pins now. That's how a hive that missed the swarm's
|
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fan-out catches up. Sub-agents and the root agent go through the same
|
|
graceful rebuild subgraph.
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"Rev" = the hyperhive commit pinned by the head of `internal/meta`, as
|
|
the hive reads it with its forge token. Marker
|
|
file: `/var/lib/hyperhive/applied/.<name>.hyperhive-rev`, written after
|
|
a successful build. If the hive can't read the pin (no forge token, the
|
|
forge down, `internal/meta` not published yet), the scan rebuilds
|
|
nothing; a rebuild would have no flake to build from either. A hive deploy
|
|
alone doesn't rebuild agents.
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|
|
|
A stopped agent gets its rebuild at its next start: the start path upgrades
|
|
the start of a stale, stopped agent to a rebuild followed by the start. In
|
|
the window after a config merge, before the swarm's update has pinned the new
|
|
config, that rebuild fails with the error that names the agent, and the
|
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agent stays stopped until the update lands and you ask for the start again.
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|
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The dashboard surfaces pending config changes per agent: a clickable
|
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"needs update ↻" badge appears whenever the agent's applied repo has a
|
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commit that its last build didn't pin. The badge POSTs `/api/rebuild/<name>`, which inserts the
|
|
same `job_queue::templates::rebuild` DAG so manual triggers and the
|
|
startup scan can't drift. When at least one container is stale, a
|
|
top-level `↻ UPD4TE 4LL` button appears that loops over every
|
|
stale container.
|