password.sh

#!/bin/sh

if [ `id -u` != "0" ]; then
    echo You have to run with root user
    exit 1
fi

cat <<EOF | tee /etc/systemd/user/x11vnc-password.service
[Unit]
Description=x11vnc password
Before=x11vnc.service

[Service]
ExecStartPre=/bin/mkdir -m 0700 -p /tmp/.qnap
ExecStartPre=/bin/bash -c "echo PASSWORD > /tmp/.qnap/vncpassword"
ExecStart=/bin/true
Type=oneshot
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target
EOF

systemctl enable /etc/systemd/user/x11vnc-password.service

echo OK