# Gebos

IoT telemetry stack on bare-metal NixOS.

This repo is a monorepo containing all code, NixOS modules, host configurations,
and CI/CD pipelines for the project. Everything is one `flake.nix`.

## Architecture

Three hosts (see issue #21 for the full design discussion):

| Host          | Role                                      | Public hostname        |
| ------------- | ----------------------------------------- | ---------------------- |
| `mqtt-ingest` | HiveMQ CE + Go MQTT→Postgres ingester     | `ingest.ge-bos.de`     |
| `db-host`     | Postgres 17 + TimescaleDB (telemetry+auth)| internal only          |
| `app-host`    | Caddy + Kong + Supabase (compose) + SPA   | `app.ge-bos.de`, `api.ge-bos.de` |

Public REST surface is PostgREST + SQL `/rpc/` functions, fronted by Kong, TLS-terminated by Caddy.
Supabase Studio is bound to `127.0.0.1` on `app-host` — reach it with `ssh -L 3000:127.0.0.1:3000 app-host`.

## Repo layout

```
flake.nix
frontend/                # Vite + React SPA
ingester/                # Go MQTT → Postgres
nix/
  modules/               # NixOS modules (one per service)
  hosts/                 # nixosConfigurations: mqtt-ingest, db-host, app-host
  supabase/              # vendored Supabase docker-compose, db init SQL
  dev/                   # process-compose for local development
  deploy.nix             # deploy-rs node map
.gitea/workflows/        # CI + CD
```

## Local development

```
nix run .#dev
```

Brings the full stack up on one machine via process-compose-flake (Postgres,
Supabase compose, Kong, Caddy, ingester, Vite dev server). NixOS required.

## Deployment

`deploy-rs` from a Gitea Actions runner on push to `main`. Closures are built
once, copied to each host, activated with auto-rollback. Order: `db-host` →
`app-host` → `mqtt-ingest`.

```
nix run github:serokell/deploy-rs -- .#db-host       # one host
nix run github:serokell/deploy-rs -- .                # all hosts
```

## Secrets

Out-of-band file at `/etc/gebos/secrets.env` on each host, mode `0400`, loaded
by systemd `EnvironmentFile=`. Not in the repo, not in the Nix store. Rotation
is manual (ssh + edit + restart unit).