setup-opds.sh: add boot watchdog cron to restart dir2opds if books mount is empty after reboot

hub/setup-opds.sh

@@ -306,6 +306,28 @@ fi
 sleep 3
 docker logs caddy-opds --tail 5 2>/dev/null || true
 
+header "Setting Up Mount Watchdog"
+
+WATCHDOG_SCRIPT="/usr/local/bin/opds-watchdog.sh"
+cat > "$WATCHDOG_SCRIPT" << EOF
+#!/usr/bin/env bash
+BOOKS_PATH="${BOOKS_PATH}"
+SERVER_NAME="${OPDS_SERVER}"
+if [ -d "\$BOOKS_PATH" ] && [ -z "\$(ls -A "\$BOOKS_PATH" 2>/dev/null)" ]; then
+    docker restart "\$SERVER_NAME" 2>/dev/null || true
+fi
+EOF
+chmod +x "$WATCHDOG_SCRIPT"
+
+CRON_LINE="@reboot sleep 30 && $WATCHDOG_SCRIPT"
+EXISTING_ROOT_CRON=$(crontab -l 2>/dev/null || true)
+if ! echo "$EXISTING_ROOT_CRON" | grep -qF "opds-watchdog"; then
+    { echo "$EXISTING_ROOT_CRON"; echo "$CRON_LINE"; } | crontab -
+    info "Watchdog crontab entry added — restarts $OPDS_SERVER if mount is empty on boot."
+else
+    info "Watchdog crontab entry already exists."
+fi
+
 header "OPDS Setup Complete"
 echo ""
 echo -e "  OPDS URL:     ${GREEN}https://${OPDS_DOMAIN}${NC}"