ops: appliance boot — wait for cameras/LiveKit, power button powers off

.env.example

@@ -1,5 +1,7 @@
 # LiveKit server connection
-LIVEKIT_URL=ws://localhost:7880
+# Local TEST server (autostarted). Switch this URL to the remote
+# LiveKit later; then: systemctl disable --now livekit-server
+LIVEKIT_URL=ws://127.0.0.1:7880
 LIVEKIT_API_KEY=APIKey_xxx
 LIVEKIT_API_SECRET=APIsecret_xxx
 

README.md

@@ -82,12 +82,29 @@ lightweight high-pass + soft-clip DSP path so streams still work.
 Until the 1 s window is full, hops use the DSP fallback so LiveKit is
 not silent on startup.
 
-## systemd (enabled, 24/7)
+## Appliance boot / power button
 
-Two units, enabled for multi-user.target:
+This box is meant to behave like an appliance:
 
-- `livekit-server.service` — `/usr/local/bin/livekit-server` + `deploy/livekit-server.yaml` (:7880)
+- Power button while **off** → BIOS/OS boot → `livekit-cameras` waits for
-- `livekit-cameras.service` — `run.py` (Requires livekit-server)
+  USB cameras + LiveKit, then publishes.
+- Power button while **on** → full `poweroff` (not sleep). Suspend/hibernate
+  targets are masked. Drop-in:
+  `/etc/systemd/logind.conf.d/50-power-button.conf`
+
+## systemd (enabled)
+
+- `livekit-server.service` — **local TEST** LiveKit on :7880 (autostart for now)
+- `livekit-cameras.service` — publishers. `Wants=` the test server, does not
+  `Require` it. Destination is `LIVEKIT_URL` in `.env` (currently
+  `ws://127.0.0.1:7880`).
+
+When the real/remote LiveKit exists, change `.env` `LIVEKIT_URL` and:
+
+```bash
+systemctl disable --now livekit-server
+systemctl restart livekit-cameras
+```
 
 ```bash
 systemctl status livekit-cameras livekit-server

deploy/50-power-button.conf

@@ -0,0 +1,9 @@
+[Login]
+HandlePowerKey=poweroff
+HandlePowerKeyLongPress=poweroff
+HandleSuspendKey=ignore
+HandleHibernateKey=ignore
+HandleLidSwitch=ignore
+HandleLidSwitchExternalPower=ignore
+HandleLidSwitchDocked=ignore
+IdleAction=ignore

deploy/livekit-cameras.service

@@ -1,20 +1,28 @@
 [Unit]
 Description=Publish C920 cameras (speechbrain audio) to LiveKit
+Documentation=file:///home/fdenkena/livekit-cameras/README.md
 After=network-online.target sound.target livekit-server.service
 Wants=network-online.target
-Requires=livekit-server.service
+# Wants, not Requires: local livekit-server is a test stand-in.
+# Point LIVEKIT_URL at a remote server later and you can disable this unit.
+Wants=livekit-server.service
 
 [Service]
 Type=simple
 WorkingDirectory=/home/fdenkena/livekit-cameras
+EnvironmentFile=-/home/fdenkena/livekit-cameras/.env
+Environment=PYTHONUNBUFFERED=1
+Environment=ENHANCE_MODE=force
+ExecStartPre=/home/fdenkena/livekit-cameras/deploy/wait-for-cameras.sh
+ExecStartPre=/home/fdenkena/livekit-cameras/deploy/wait-for-livekit.sh
 ExecStart=/home/fdenkena/livekit-cameras/.venv/bin/python /home/fdenkena/livekit-cameras/run.py
+ExecStop=/bin/kill -TERM $MAINPID
 Restart=always
 RestartSec=5
+TimeoutStartSec=90
 TimeoutStopSec=30
 KillMode=control-group
-Environment=PYTHONUNBUFFERED=1
+KillSignal=SIGTERM
-Environment=LIVEKIT_URL=ws://127.0.0.1:7880
-Environment=ENHANCE_MODE=force
 
 [Install]
 WantedBy=multi-user.target

deploy/livekit-server.service

@@ -1,5 +1,6 @@
 [Unit]
-Description=LiveKit server for the C920 camera fleet
+Description=LiveKit TEST server for the C920 camera fleet (local only)
+Documentation=file:///home/fdenkena/livekit-cameras/README.md
 After=network-online.target
 Wants=network-online.target
 

deploy/wait-for-cameras.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+# Wait for udev to pin C920 nodes after boot. Never fail the unit:
+# discovery can still run with whatever is present.
+set -u
+udevadm settle -t 20 || true
+udevadm trigger --subsystem-match=video4linux --action=add || true
+udevadm trigger --subsystem-match=sound --action=add || true
+for _ in $(seq 1 45); do
+  n=$(ls -1 /dev/cam[0-9][0-9] 2>/dev/null | wc -l)
+  if [ "$n" -ge 1 ]; then
+    echo "wait-for-cameras: $n pinned /dev/camNN nodes"
+    exit 0
+  fi
+  sleep 1
+done
+echo "wait-for-cameras: none yet; starting anyway" >&2
+exit 0

deploy/wait-for-livekit.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+# Wait until LIVEKIT_URL (from .env) accepts TCP. Used so publishers do not
+# race the local test livekit-server on boot. When LIVEKIT_URL points at a
+# remote host this waits on that host instead.
+set -u
+ENV_FILE=/home/fdenkena/livekit-cameras/.env
+if [ -f "$ENV_FILE" ]; then
+  set -a
+  # shellcheck disable=SC1090
+  . "$ENV_FILE"
+  set +a
+fi
+URL="${LIVEKIT_URL:-ws://127.0.0.1:7880}"
+rest="${URL#*://}"
+hostport="${rest%%/*}"
+host="${hostport%%:*}"
+port="${hostport##*:}"
+case "$hostport" in
+  *:*) ;;
+  *)
+    case "$URL" in
+      wss://*) port=443 ;;
+      *) port=80 ;;
+    esac
+    ;;
+esac
+if [ "$host" = "localhost" ]; then
+  host=127.0.0.1
+fi
+echo "wait-for-livekit: $host:$port"
+for _ in $(seq 1 30); do
+  if (echo >/dev/tcp/"$host"/"$port") 2>/dev/null; then
+    echo "wait-for-livekit: ready"
+    exit 0
+  fi
+  sleep 1
+done
+echo "wait-for-livekit: $host:$port not reachable after 30s" >&2
+exit 1