Python script to force timedatectl NTP time sync

trigger-timedatectl-sync.py

import socket
import struct
import subprocess
import time

REF_TIME_1970 = 2208988800  # Reference time

def get_ntp_time(addr="0.de.pool.ntp.org") -> int | None:

    client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

    try:
        client.settimeout(5)
        data = b"\x1b" + 47 * b"\0"
        client.sendto(data, (addr, 123))
        data, _ = client.recvfrom(1024)
        if data:
            t = struct.unpack("!12I", data)[10]
            t -= REF_TIME_1970
            return t
    finally:
        client.close()

    return None


if __name__ == "__main__":
    subprocess.run(["timedatectl", "set-ntp", "false"], capture_output=True)
    t = get_ntp_time()
    if t:
        time.clock_settime(time.CLOCK_REALTIME, float(t))
        subprocess.run(["hwclock", "--systohc"], capture_output=True)
        subprocess.run(["timedatectl", "set-ntp", "true"], capture_output=True)