[Unit]
Description=GNOME session on the headless Xorg (gives Sunshine something to capture)
# Without a desktop running on :0, Sunshine's x11 capture grabs an empty black
# X root window — pairing, NVENC, and input all work but the client sees only
# black. This runs a full GNOME session on :0 so the stream shows a real
# desktop. Only relevant to the X11/NVENC capture backend (capture = x11); the
# wlr backend's compositor renders for itself.
Requires=xorg-headless.service
After=xorg-headless.service
PartOf=graphical-session.target

[Service]
Type=simple
# Force the X11 session path (not Wayland) onto the existing headless Xorg.
# No dbus-run-session wrapper: GNOME integrates with the systemd *user* bus,
# which this service already inherits — a fresh bus would break that.
Environment=DISPLAY=:0
Environment=XDG_SESSION_TYPE=x11
Environment=XDG_CURRENT_DESKTOP=ubuntu:GNOME
Environment=GNOME_SHELL_SESSION_MODE=ubuntu
# Wait for the X server to accept connections before launching the session.
ExecStartPre=/bin/sh -c 'for i in $(seq 1 20); do xset -display :0 -q >/dev/null 2>&1 && exit 0; sleep 0.5; done; exit 1'
ExecStart=/usr/bin/gnome-session --session=ubuntu
Restart=on-failure
RestartSec=2s

[Install]
# Lingering user manager reaches default.target without a graphical login,
# matching the headless-boot drop-in pattern used for Sunshine.
WantedBy=default.target