= Deployment
:toc:
:toclevels: 2

MapTool deploys as a Docker container on the same server the Gitea Actions
runners run on. Two separate runners are registered against the Gitea
instance:

* The existing Docker-based runner (`gitea/runner:3`), labels
  `ubuntu-latest`/`ubuntu-24.04`/`ubuntu-22.04` — runs the `check` job
  in a fresh, isolated container per job, same as before.
* A dedicated native runner, installed directly on the host (no Docker
  around it), label `deploy:host` — runs only the `deploy` job.

They're separate because the Docker-based runner's jobs (whether in
its usual isolated per-job containers, or tried directly inside its
own container via a `host`-scheme label) have no reliable access to
the host's filesystem, `systemctl`, or even a full toolset (its own
container image is missing `rsync`, `docker` CLI, Node.js — it's built
for spawning per-job containers via its `docker.sock` mount, not for
running arbitrary host commands). The native runner sidesteps all of
that: it *is* a host process, so `docker`, `git`, etc. are just
whatever's installed on the server.

== Layout on the server

`/srv/docker/maptool/` holds:

* A checkout of this repository (kept in sync by the deploy job, see
  below) — `Dockerfile`, `docker-compose.yaml`, application code.
* `data/`, *not* part of that sync — uploaded GPX files and
  `offline.pmtiles`. Persisted via a bind mount (`./data:/app/data` in
  `docker-compose.yaml`), so a redeploy (`docker compose up --build`)
  never touches it.

== The native deploy runner

Installed from the official binary (see
https://docs.gitea.com/runner/installation/binary/), running as a
systemd service (`gitea-runner.service`) under a dedicated
`gitea-runner` system user, which needs:

* Docker access (member of the `docker` group).
* Write access to `/srv/docker/maptool`.

Its `config.yaml` (`/etc/gitea-runner/config.yaml`) declares a single
label:

[source,yaml]
----
runner:
  labels:
    - "deploy:host"
----

The `host` scheme means jobs run directly via the runner process's own
shell — no container spawned — which is exactly what a plain, single
purpose deploy runner needs.

== Puma's bind address

`config/puma.rb` binds to `127.0.0.1` by default (see
`docs/architecture.adoc`) — fine for local dev, but inside a container
that would make the app unreachable through Docker's published port
(loopback is scoped to the container's own network namespace).
`docker-compose.yaml` sets `BIND_HOST=0.0.0.0` to override that for
the deployed container specifically; Docker's own port publishing
(`ports:` in the compose file) is the network boundary there instead
of Puma's bind address.

== Secrets (`.env`)

`docker-compose.yaml` reads `SESSION_SECRET`, `GITEA_OAUTH_CLIENT_ID`,
`GITEA_OAUTH_CLIENT_SECRET` and `MAPTOOL_ALLOWED_GITEA_USER` from the
environment (see `docs/architecture.adoc` for what they're for) —
docker compose loads these automatically from a `.env` file next to
`docker-compose.yaml`, i.e. `/srv/docker/maptool/.env`. That file is
gitignored and dockerignored on purpose: nothing here ever puts
secrets in the repository or a built image layer.

It's not created by hand on the server — the deploy job's "Write
.env" step regenerates it on every deploy from repo-level Gitea
Actions secrets (*Settings → Actions → Secrets*): `SESSION_SECRET`,
`OAUTH_CLIENT_ID`, `OAUTH_CLIENT_SECRET`, `MAPTOOL_ALLOWED_GITEA_USER`.
The OAuth2 ones aren't named `GITEA_OAUTH_CLIENT_*` to match the `.env`
var names 1:1 — Gitea rejects secret names starting with `GITEA_` or
`GITHUB_` as reserved — but the workflow step maps them to the right
`.env` var names regardless. Gitea masks secret values in the job log
automatically. Set these once in the repo settings and every deploy
since keeps `.env` in sync — no server-side step needed beyond the
first-time OAuth2 application registration below.

`SESSION_SECRET` must stay the same value across deploys (regenerating
it every push would silently log everyone out every time `main`
changes) — generate it once (`openssl rand -hex 32`) and store that
same value as the secret from then on, don't regenerate per-deploy.

Register the OAuth2 application on the Gitea side (as the
`MAPTOOL_ALLOWED_GITEA_USER` account): *Settings → Applications →
Manage OAuth2 Applications → Create a new OAuth2 Application*, with
redirect URI `https://map.priesol.net/auth/callback`. That gives you
the client id/secret to store as the two `GITEA_OAUTH_*` secrets
above.

== CI deploy job

`.gitea/workflows/ci.yml`'s `deploy` job runs after `check` passes, only
on a push to `main`, with `runs-on: deploy`:

. Checks out the repo with plain `git` (`fetch` + `checkout`,
  authenticated via a one-off `http.extraHeader`) rather than
  `actions/checkout@v4` — a leftover from when this job ran in a
  Node-less container; kept as-is since there's no reason to bring
  Node back in for something this already does.
. Copies the checkout into `/srv/docker/maptool/` using plain `cp`/`rm`:
  clears everything in the target except `data/`, copies the fresh
  checkout over, then drops the copied `.git`.
. `cd /srv/docker/maptool && docker compose -p maptool up --build -d`
  — rebuilds the image and recreates the container if anything
  changed; a no-op if nothing did.