The controller is a Go program and was the one piece of the mesh's own Go
code still shipped and run as an image (novox/hq issue 213; ADR 0188 §1:
a module's own code is bundles; §3: a service bundle is a process).
The manifest now builds one Go bundle, `controller`, and runs it as the
process `mesh-controller` (`./mesh-controller serve`) under an account
the module declares. What the container gave it, replaced:
- host network: a process is on the host's network; nothing it reads
names a container network
- user 65534: the account `mesh-controller`, which owns its secrets and
its state directory
- the eight mounts: the env names the host paths the mesh already places
(the store, broker and bus files under the state directory, the
broker's certificate under /var/lib/mesh-broker-tls); the `broker`
mount was read by nothing and is gone with the others
- `container-runtime` is no longer required on its machine
Its preparation is the same binary with `prepare`, as a run-once process,
and the process `replaces` the container `server`: the host keeps the
container answering until the process is running (mesh-host). Needs the
previous commit live in the running controller, and the host's
`replaces` on the controller's machine, before it is registered.
No image is built by the mesh any more. The Dockerfile stays for genesis
and the lab (`make image`, its Go base now pinned in the Makefile).
jochen
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