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feat(host/gamescope): headless game mode that follows the box + matches the client
Make Steam game mode work on a display-less streaming host and stream it at the
client's resolution:

* Ship /etc/gamescope-session-plus/sessions.d/steam (packaging/bazzite/
  gamescope-headless-session, installed by the RPM + Arch PKGBUILD): fall back to
  gamescope's headless backend when no display is connected, so "Switch to Game
  Mode" boots offscreen instead of crashing on the missing panel (and 5-striking
  back to desktop). No-op on display-attached boxes; only sets unset values so
  the host's per-client mode still wins.

* Default Bazzite/SteamOS to ATTACH (PUNKTFUNK_GAMESCOPE_ATTACH=1 in host.env):
  the box owns its session (Desktop<->Game, persistent), the host follows +
  captures it and never tears it down — so switching is rock-solid and a
  disconnect leaves the box in its mode (reconnect returns there).

* Resize-on-attach (gamescope.rs): on connect, ensure the box's own game-mode
  session runs at the CLIENT's resolution — reuse it when already matching (fast
  path, no restart), else reconfigure + restart the box's own autologin
  gamescope-session-plus@<client> at the client mode (cooperative: no competing
  unit, so no autologin-respawn fight). Detect the live gamescope's -W/-H via
  argv[0] in /proc (its /proc/<pid>/exe is unreadable for that process).

Validated live on a headless bazzite-deck-nvidia box: game mode boots headless +
stable (0 strikes); the host attaches + streams video/audio/EIS input; a
5120x1440 client reuses the matching session and streams at 5120x1440.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-28 11:09:45 +00:00
..

Packaging punktfunk for Fedora / Bazzite

The punktfunk host is Linux-only and links system FFmpeg (NVENC), PipeWire, Opus and the NVIDIA driver. This directory packages it for the Fedora Atomic / Bazzite world (rpm-ostree + bootc), where most of those deps are already present.

👉 Ubuntu/Debian hosts install via apt from Gitea's package registry — see debian/README.md (apt update && apt upgrade for new builds).

👉 End-to-end Bazzite setup walkthrough (install → udev/group → host.env → service → firewall → verify → troubleshooting): bazzite/README.md. This file is the higher-level packaging rationale.

packaging/
  rpm/punktfunk.spec      # the RPM (builds punktfunk-host from source with cargo)
  bazzite/host.env        # gamescope-default config for a Bazzite appliance
  bazzite/README.md       # step-by-step Bazzite setup guide
  bootc/Containerfile     # bake punktfunk into a Bazzite-based atomic image
  copr/                   # COPR build-from-SCM settings

What's needed beyond base Fedora

Dependency Where it comes from
ffmpeg-libs with NVENC RPM Fusion nonfree (ffmpeg, not ffmpeg-free)
NVIDIA driver (libnvidia-encode, libEGL_nvidia) Bazzite -nvidia images ship it; plain Fedora: akmod-nvidia + xorg-x11-drv-nvidia-cuda
gamescope, PipeWire, wireplumber Bazzite ships these; plain Fedora: dnf install gamescope pipewire wireplumber
opus, libei Fedora base / updates

On Bazzite the only genuinely new runtime bits are ffmpeg-libs (RPM Fusion) + opus + libei — the rest of the stack is already there. The default backend is gamescope (packaging/bazzite/host.env), which the host spawns headless per session — no desktop login.

The host's RPM is published to unom's self-hosted Gitea RPM registry (CI builds it on every push), mirroring the Debian/apt setup. Add one repo file, install, and track updates with rpm-ostree upgrade — no COPR account needed. Full guide: rpm/README.md.

# GPG-signed pkgs + Gitea-signed metadata → gpgcheck=1, repo_gpgcheck=1 (see rpm/README.md)
sudo tee /etc/yum.repos.d/punktfunk.repo >/dev/null <<'REPO'
[gitea-unom-bazzite]
name=punktfunk (unom, Bazzite)
baseurl=https://git.unom.io/api/packages/unom/rpm/bazzite
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://git.unom.io/api/packages/unom/rpm/repository.key
       https://git.unom.io/api/packages/unom/generic/punktfunk-keys/1/RPM-GPG-KEY-punktfunk
REPO
rpm-ostree install punktfunk && systemctl reboot
# updates:  rpm-ostree upgrade && systemctl reboot

Option B — COPR (per-host, rpm-ostree install)

  1. Create a COPR project, enable build-from-SCM pointing at this repo, spec path packaging/rpm/punktfunk.spec (see copr/README.md). Under External Repositories add RPM Fusion nonfree so ffmpeg-devel resolves at build time.
  2. On the Bazzite host:
    # RPM Fusion (for the NVENC ffmpeg) — usually already enabled on Bazzite
    rpm-ostree install \
      https://mirrors.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm \
      https://mirrors.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$(rpm -E %fedora).noarch.rpm
    # enable the COPR + install punktfunk
    sudo wget -O /etc/yum.repos.d/_copr_punktfunk.repo \
      https://copr.fedorainfracloud.org/coprs/enricobuehler/punktfunk/repo/fedora-$(rpm -E %fedora)/
    rpm-ostree install punktfunk
    systemctl reboot
    

Option B — bootc (image-based, atomic)

Layer punktfunk into a Bazzite image once, then rebase any number of hosts onto it — no per-host drift. See bootc/Containerfile:

podman build -t ghcr.io/<you>/bazzite-punktfunk -f packaging/bootc/Containerfile .
podman push  ghcr.io/<you>/bazzite-punktfunk
# on the target:
sudo bootc switch ghcr.io/<you>/bazzite-punktfunk && systemctl reboot

First-run setup (either option)

ujust add-user-to-input-group           # virtual gamepads need /dev/uinput (then re-login).
                                        # On Bazzite use ujust, NOT `usermod -aG input` (atomic OS — it won't stick).
mkdir -p ~/.config/punktfunk
cp /usr/share/punktfunk/host.env.bazzite ~/.config/punktfunk/host.env   # edit (gamescope app, etc.)
systemctl --user enable --now punktfunk-host

# Management web console (pairing + status) — pulled in by default (the host RPM Recommends it;
# `--no-install-recommends` / headless-only boxes can skip it). Enable it and read the login password:
systemctl --user enable --now punktfunk-web
journalctl --user -u punktfunk-web-init | sed -n 's/.*password generated: //p'   # then open http://<host-ip>:3000

Pair a stock Moonlight client (mDNS-discovered), or connect the native punktfunk/1 client — via the web console at http://<host-ip>:3000 or directly.

⚠️ COPR caveat: COPR's mock chroot has no bun, so a COPR build produces only punktfunk + punktfunk-clientnot punktfunk-web. For the console on a COPR/bootc host, install from the Gitea RPM registry (Option A — it carries punktfunk-web), which is also why bootc/Containerfile installs from there rather than COPR.

Why not Flatpak (for the HOST)?

The host needs unsandboxed access the zero-copy NVENC path, /dev/uinput, the PipeWire graph and the compositor's privileged protocols — a Flatpak sandbox fights all of these. An RPM (or the bootc layer) installs into the host system where those just work.

👉 The client is a different story — it IS shipped as a Flatpak (the only viable Steam Deck install path: SteamOS /usr is read-only and lacks libadwaita/libSDL3). See flatpak/README.md. The client sandbox only needs the GPU render node, Wayland, PipeWire audio, the network and hidraw — all expressible as finish-args.

Building the SRPM/RPM locally (Fedora only)

git archive --format=tar.gz --prefix=punktfunk-0.0.1/ -o ~/rpmbuild/SOURCES/punktfunk-0.0.1.tar.gz HEAD
rpmbuild -ba packaging/rpm/punktfunk.spec     # needs the BuildRequires from the spec

(Not buildable on Debian/Ubuntu — use a Fedora toolbox/container or COPR.)