41 lines
1.9 KiB
Markdown
41 lines
1.9 KiB
Markdown
# swarm-builder
|
|
|
|
The swarm builder's build service, in the `swarm-builder` container on the
|
|
host that sets `deploy.builder.enable`. The design is
|
|
[`docs/swarm/builder.md`](../docs/swarm/builder.md).
|
|
|
|
swarm-controller sends one request per config PR head: an agent, a commit and
|
|
the PR. This service builds that agent config on the agent base this host was
|
|
deployed with, through the host's nix daemon, and answers with the system
|
|
closure's store path or the tail of what `nix` printed. The controller turns
|
|
the answer into a `swarm-builder` commit status on the PR's head.
|
|
|
|
## What a build is
|
|
|
|
- `nix build` of `nix/builder/check-flake`'s `check` output, with its three
|
|
inputs overridden: `hyperhive` and `nixpkgs` to this host's own sources,
|
|
and `agent` to `git+https://<forge>/agent-configs/<agent>?ref=refs/pull/<pr>/head&rev=<rev>`.
|
|
- The evaluation runs here, pure; the builds run in the host daemon's sandbox
|
|
as an untrusted client, so a config can neither set daemon options nor read
|
|
this service's environment.
|
|
- Nothing is pushed and nothing is recorded: the closure stays in the host's
|
|
store until it is collected.
|
|
|
|
## Credentials
|
|
|
|
The container holds one credential: its own store certificate, which nspawn
|
|
hands in at start without a copy on disk. With it the service reads its
|
|
queue client secret at start and again when authelia refuses it, and its
|
|
read-only forge token at every build.
|
|
`git` gets the token through a credential helper reading the child's
|
|
environment, never in a URL or an argument, and the helper answers only an
|
|
`https` request for the forge's host. Its store role reads exactly
|
|
those two paths.
|
|
|
|
## Archetypes
|
|
|
|
The service also answers archetype evaluations: `nix eval` of the `meta` of
|
|
every `hyperhiveArchetypes` entry in this host's hyperhive source, with
|
|
nixpkgs pointed at this host's. It fetches nothing and uses no token, and it
|
|
doesn't wait for a running build. See
|
|
[`docs/swarm/archetypes.md`](../docs/swarm/archetypes.md).
|