#!/usr/bin/env bash
# Enable systemd's hardware watchdog on the Pi.
# Run this ON THE PI as the `yaris` user:
#   cd /home/yaris/app/yaris-obd && bash deploy/install_watchdog.sh
set -euo pipefail

REPO_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
CONFIG_FILE="$REPO_DIR/deploy/yaris-watchdog.conf"
CONFIG_DIR="/etc/systemd/system.conf.d"
CONFIG_DEST="$CONFIG_DIR/yaris-watchdog.conf"

if [ ! -e /dev/watchdog0 ]; then
    echo "No /dev/watchdog0 device found; refusing to enable a watchdog."
    exit 1
fi

sudo install -D -m 0644 "$CONFIG_FILE" "$CONFIG_DEST"

# Manager configuration is not covered by daemon-reload. Re-exec systemd so the
# watchdog starts now without requiring an otherwise unnecessary reboot.
sudo systemctl daemon-reexec

runtime_watchdog="$(systemctl show --property=RuntimeWatchdogUSec --value)"
if [ "$runtime_watchdog" = "0" ]; then
    echo "Runtime watchdog did not activate; check $CONFIG_DEST."
    exit 1
fi

echo "Hardware watchdog enabled with RuntimeWatchdogUSec=$runtime_watchdog."
echo "Reboot once when convenient, then rerun this script to verify persistence."