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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34
nix/host-modules/glue-builder-oidc-client.nix Normal file
View file

@ -0,0 +1,34 @@
# Glue: register the swarm builder as an OIDC client wherever authelia runs.
#
# ONE PAIRING PER FILE — swarm-builder ← authelia, and nothing else. Deleting
# this leaves a builder whose token requests authelia answers with a 401, and
# no minted secret for swarm-secret-publish to put in the store.
#
# ⚠️ Gated on authelia being HERE, and NOT on this host running the builder,
# for ./glue-controller-oidc-client.nix's reason: a client is a row in THIS
# host's provider config. Registered whether or not any host enables the
# builder: nothing in `swarm.*` records that, so a swarm without one carries
# one unused client and one unused minted secret.
{
lib,
config,
...
}:
let
hyperhiveCfg = config.services.hyperhive;
deployCfg = hyperhiveCfg.deploy;
clientId = hyperhiveCfg.swarm.builder.clientId;
in
{
config = lib.mkIf deployCfg.authelia.enable {
services.hyperhive.swarm.authelia.oidc.clients = [
{
id = clientId;
description = "HyperHive swarm builder";
# `client_credentials`: a daemon authenticating as itself.
kind = "machine";
audience = [ clientId ];
}
];
};
}