punktfunk/packaging/debian/README.md

# punktfunk-host — Debian/Ubuntu package (apt)

`punktfunk-host` is published as a `.deb` to **Gitea's Debian package registry** in the public
`unom` org, so the Ubuntu hosts update with plain `apt`. CI (`.gitea/workflows/deb.yml`) builds
and publishes on every push to `main` (a rolling `0.5.0~ciN.g<sha>` build to the **`canary`** apt
distribution) and on `vX.Y.Z` tags (a clean `X.Y.Z` to the **`stable`** distribution, plus attached
to the unified Gitea Release). The two are separate apt distributions, so a stable box never jumps
to a canary build — see [Release Channels](https://punktfunk.unom.io/docs/channels). The repo line
below subscribes to `stable`; swap `stable` → `canary` for the latest main builds.

The same workflow also publishes **`punktfunk-web`** (the browser management console — pairing +
status) and **`punktfunk-client`** (the native GTK4/libadwaita Linux client). `punktfunk-host` **Recommends**
`punktfunk-web`, so a default `apt install punktfunk-host` pulls the console too (alongside the
udev/sysctl bits) unless you've disabled weak deps; `punktfunk-client` is independent — install it
on the box you stream *to*. (`punktfunk-probe` is the headless reference/test tool, not packaged
here.)

Package layout mirrors the Fedora RPM (`../rpm/punktfunk.spec`): the host binary, the `/dev/uinput`
udev rule, the systemd **user** unit, headless session helpers, the example config, and the OpenAPI
doc. Runtime `Depends` are computed by `dpkg-shlibdeps` from the binary itself (built in the Ubuntu
26.04 rust-ci image, so the lib soname package names match the target). The NVIDIA driver
(`libnvidia-encode` / `libEGL_nvidia` / `libcuda`) is **not** a dependency — it's installed out of
band, like on the RPM side.

## Install on a host (one-time)

The registry is public, so no apt auth is needed — just trust the repo's signing key:

```sh
sudo install -d -m 0755 /etc/apt/keyrings
curl -fsSL https://git.unom.io/api/packages/unom/debian/repository.key \
  | sudo tee /etc/apt/keyrings/punktfunk.asc >/dev/null

echo "deb [signed-by=/etc/apt/keyrings/punktfunk.asc] https://git.unom.io/api/packages/unom/debian stable main" \
  | sudo tee /etc/apt/sources.list.d/punktfunk.list

sudo apt update
sudo apt install punktfunk-host
```

Then, as the desktop user:

```sh
sudo usermod -aG input "$USER"          # virtual gamepads (re-login to take effect)
mkdir -p ~/.config/punktfunk
cp /usr/share/punktfunk-host/host.env.example ~/.config/punktfunk/host.env   # then edit
systemctl --user enable --now punktfunk-host
# Web console — enable it and read the auto-generated login password (then open https://<host-ip>:47992):
systemctl --user enable --now punktfunk-web
journalctl --user -u punktfunk-web-init | sed -n 's/.*password generated: //p'
```

## Firewall

**Debian ships no firewall and Ubuntu's `ufw` is installed-but-inactive by default**, so out of the
box there is nothing to open. If you turn one on, the `punktfunk-host` package ships a one-liner
opener for both **ufw** and **firewalld** (neither auto-enabled):

```sh
# ufw (Ubuntu) — profile at /etc/ufw/applications.d/punktfunk, read at once (no reload):
sudo ufw allow punktfunk-native        # the default native host
sudo ufw allow punktfunk-gamestream    # …add for Moonlight compat

# firewalld — service definitions at /usr/lib/firewalld/services/:
sudo firewall-cmd --reload                                          # load the installed definition
sudo firewall-cmd --permanent --add-service=punktfunk-native
#                              --add-service=punktfunk-gamestream    # …add for Moonlight compat
sudo firewall-cmd --reload
```

If you installed the **web console** (`punktfunk-web`) and want it reachable from another device,
open its port with the matching one-liner — `sudo ufw allow punktfunk-web` or `sudo firewall-cmd
--permanent --add-service=punktfunk-web && sudo firewall-cmd --reload` — which opens **TCP 47992**
(HTTPS, login-gated). The mgmt API (47990) stays loopback-only.

Prefer explicit rules? Open the ports directly. The **native `punktfunk/1`** plane:

- **QUIC control plane: UDP 9777** (`serve --native-port N` to change).
- **Data plane: a separate UDP port.** By default it's *random* — the host binds `0.0.0.0:0` and
  tells the client which port it got. Video flows host → client, but the **client sends the first
  packet** (a hole-punch), so the host learns the client's real source and streams back — this
  traverses NAT / inter-VLAN with no forwarded port. **You normally don't open it:** if a deny-inbound
  firewall drops the punch, the host waits ~2.5 s and falls back to the client-reported address, and a
  stateful firewall then admits the return (it just adds ~2.5 s to session start). To skip that delay,
  pin it with **`serve --data-port <PORT>`** (or `PUNKTFUNK_DATA_PORT`): the host binds that fixed
  port and streams direct (no punch-wait) — open exactly that one port. A fixed port serves one
  session at a time (concurrent ones fall back to random + hole-punch), and direct mode needs the
  client's reported address to be reachable (flat LAN / a non-remapping port-forward).

And the **GameStream / Moonlight** ports (fixed) — only needed if you run the host with
`serve --gamestream` (opt-in, trusted LAN only); bare `serve` is native-only and doesn't open these:

| Port | Proto | Purpose |
|---|---|---|
| 47984 | TCP | HTTPS nvhttp (paired, mutual-TLS) |
| 47989 | TCP | HTTP nvhttp (`/serverinfo`, `/pair` PIN flow) |
| 48010 | TCP | RTSP handshake |
| 47998–48010 | UDP | Video RTP (+ FEC), ENet control (47999), audio (48000) |
| 5353 | UDP | mDNS auto-discovery |

The mgmt API (TCP 47990) binds to loopback by default — leave it closed unless you move it off
loopback with `--mgmt-bind IP:PORT` (which then requires `--mgmt-token`).

With `ufw` (explicit ports, instead of the shipped profile):

```sh
sudo ufw allow 9777/udp                                 # punktfunk/1 control plane
sudo ufw allow 47984/tcp && sudo ufw allow 47989/tcp && sudo ufw allow 48010/tcp
sudo ufw allow 47998,47999,48000/udp                    # GameStream video/control/audio
sudo ufw allow 5353/udp                                 # mDNS discovery
# The punktfunk/1 data plane uses a random UDP port; leave it closed on a LAN — the host hole-punches
# and falls back (~2.5s at session start if firewalled). To skip that, pin it: `serve --data-port
# 9778` and `ufw allow 9778/udp`.
```

With raw `nftables` (add to your `inet filter input` chain):

```
udp dport 9777 accept                  # punktfunk/1 control plane
tcp dport { 47984, 47989, 48010 } accept
udp dport { 47998-48010, 5353 } accept
# The punktfunk/1 data plane is a random UDP port — normally left closed (hole-punch + ~2.5s
# fallback). Pin it with `serve --data-port <PORT>` to open exactly one instead.
```

## Updates

```sh
sudo apt update && sudo apt upgrade        # picks up the newest published build
systemctl --user restart punktfunk-host    # if the unit was already running
```

## Build a `.deb` locally

```sh
VERSION=0.0.1 bash packaging/debian/build-deb.sh   # -> dist/punktfunk-host_0.0.1_amd64.deb
```

Needs `dpkg-dev` (`dpkg-shlibdeps`, `dpkg-deb`). It builds the release binary first if missing.
Build it in the rust-ci image (or on an Ubuntu 26.04 box) so the resolved `Depends` match the
hosts; building on a GPU box is fine — the NVIDIA driver lib is filtered out either way.