vinzenz/hyperhive
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swarm-builder: build each agent config PR head and post a commit status

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A new `swarm-builder` service, in its own container on the host that sets
`deploy.builder.enable` (defaulted on by `allSwarmServices` where the host
has the builder's store leaf, like the review classifier).

When an `agent-configs/<agent>` PR is opened, reopened or synchronized,
swarm-controller queues a `build_agent` jobq node. The node sets a
`swarm-builder` commit status to pending on the PR head, sends
`{agent, rev, pr}` to the builder over NATS request-reply
(`$SWARM.builder.build`), and writes success (store path), failure (last
line nix printed) or error (no builder / no reply) on the head. The node
fails when the build does, so the Jobs page matches the PR.

The builder builds nix/builder/check-flake's `check` with every input
overridden: hyperhive and nixpkgs to the host's own
`c0re.hyperhiveFlake`/`c0re.nixpkgsFlake` (what a hive there renders into
its meta flake), and the agent to the PR head on the forge. Evaluation is
pure and runs in the container; builds go to the host nix daemon as an
untrusted client. The private config repo is fetched with the token of a
new read-only `builder` forge account (in the `hives` team), which the
controller mints into `swarm/services/builder/forge/token`; git gets it
from a credential helper reading the child's environment, so it is in no
argument or URL.

Credentials: a `builder` store leaf minted by glue-bao-tls on the store
host, a `swarm-builder` reader policy (forge token + its own OIDC client
secret), an authelia machine client, and a `--builder-client` grant in the
queue's auth-callout responder. The controller gains a grant on the token
path and the secret publisher a deny on it.

This is the agent-config build check atlas scoped on #5081 (slice 3):
nothing is pushed to a cache, nothing is written to KV, and a red status
gates no deploy. The check composes agent-base + the config without the
values a hive adds (CA, docs, claude-code path, ports, input follows), so
it can disagree with a hive's own build.
This commit is contained in:
atlas 2026-10-12 22:04:51 +02:00
commit b68b74d687
43 changed files with 2452 additions and 42 deletions
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26
nix/builder/check-flake/flake.nix Normal file
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# The swarm builder's build check: one agent config on hyperhive's agent base,
# composed the way a hive's meta flake composes it, minus the values a hive
# adds (its CA, docs source, claude-code path and ports).
#
# Every input is replaced at build time with `--override-input`
# (swarm-builder/src/nix_build.rs), so the URLs below are never fetched and
# the flake has no lock.
{
description = "swarm-builder: an agent config built on agent-base";
inputs = {
nixpkgs.url = "flake:nixpkgs";
hyperhive.url = "flake:hyperhive";
hyperhive.inputs.nixpkgs.follows = "nixpkgs";
agent.url = "flake:agent";
};
outputs =
{ hyperhive, agent, ... }:
{
packages.x86_64-linux.check =
(hyperhive.nixosConfigurations.agent-base.extendModules {
modules = [ agent.nixosModules.default ];
}).config.system.build.toplevel;
};
}