[Unit]
Description=Openbox session on the headless Xorg (gives Sunshine something to capture)
# Without a window manager/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 unit renders a session onto :0 so the stream
# shows an actual 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
Environment=DISPLAY=:0
# Wait for the X server to accept connections before launching the WM.
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/openbox-session
# Paint a solid root so a connecting client sees an obvious (non-black) desktop.
# Leading '-' = best-effort; a missing xsetroot must not fail the unit.
ExecStartPost=-/usr/bin/xsetroot -display :0 -solid "#2e3440"
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