ntpsec-rs-wait-0.3.49 is not a library.

ntpsec-rs-wait — ntpwait-rs

NTP wait tool — blocks until an NTP server becomes reachable or a time condition is met.

Part of the ntpsec-rs workspace — a forensic Rust reconstruction of NTPsec. Version 0.3.48.

Overview

ntpwait-rs is a utility tool that blocks execution until an NTP server becomes reachable or a time synchronization condition is satisfied. It is a forensic Rust reconstruction of the NTPsec ntpwait Python client.

This tool is primarily used in boot scripts and deployment automation to ensure that time synchronization is established before starting time-sensitive services.

Use Cases

Boot Scripts

In system startup sequences, ntpwait-rs ensures the system clock is synchronized before dependent services start:

#!/bin/sh
# Start NTP daemon
ntpd-rs -n &
# Wait for synchronization
ntpwait-rs -t 60
# Start time-sensitive services
postgresql start

Deployment Automation

In container orchestration or CI/CD pipelines, verify time sync before running distributed tests:

ntpwait-rs -t 300 -v
if [ $? -eq 0 ]; then
    echo "Time is synchronized. Proceeding with deployment..."
    deploy
else
    echo "WARNING: NTP did not synchronize within timeout."
fi

Configuration Management

As a precondition in Ansible, Puppet, or Chef playbooks:

- name: Wait for NTP sync
  command: ntpwait-rs -t 120
  register: ntp_result

Command-Line Flags

Flag	Description	Default
`-t, --timeout <secs>`	Maximum wait time in seconds	`30`
`-p, --poll-interval <secs>`	How often to poll for sync status	`1`
`-v, --verbose`	Enable verbose output showing polling progress	false
`-c, --command <cmd>`	ntpq command to check synchronization status	`rv 0`

Exit Codes

Code	Meaning
`0`	NTP server is reachable / time condition met
`1`	Timeout reached without synchronization
`2`	Error (connection refused, protocol error, etc.)

Usage Examples

Basic Wait (30-second default timeout)

ntpwait-rs

Wait with Custom Timeout

ntpwait-rs -t 120

Waits up to 120 seconds for NTP synchronization.

Verbose Mode

ntpwait-rs -v -t 60

Shows periodic status updates while waiting:

ntpwait-rs v0.3.48 — NTP wait tool (Rust)
Waiting up to 60 seconds for NTP sync...
  poll 1: not synchronized yet (stratum=16)
  poll 2: not synchronized yet (stratum=16)
  poll 3: synchronized (stratum=3, offset=0.000456s)
NTP synchronization achieved after 3 seconds.

Fast Polling

ntpwait-rs -p 5 -t 30

Polls every 5 seconds instead of the default 1 second.

Integration with systemd

[Unit]
Description=MyService - requires NTP sync
Requires=ntpd-rs.service
After=ntpd-rs.service

[Service]
Type=oneshot
ExecStartPre=/usr/bin/ntpwait-rs -t 60
ExecStart=/usr/bin/my-service

Related Crates

All crates in the ntpsec-rs workspace on crates.io:

Crate	Description	crates.io
ntpsec-rs-core	Deterministic engine, wire codec, Mode 6, auth, refclocks, NTS
ntpsec-rs-io	Real I/O layer (system clock, network, state store)
ntpsec-rs	Umbrella facade crate
ntpsec-rs-d	ntpd-rs — NTP daemon binary
ntpsec-rs-query	ntpq-rs — Mode 6 query client
ntpsec-rs-dig	ntpdig-rs — NTP query tool
ntpsec-rs-keygen	NTP key generation
ntpsec-rs-leapfetch	Leap second file fetcher
ntpsec-rs-mon	Real-time NTP monitoring tool
ntpsec-rs-trace	NTP path trace tool
ntpsec-rs-wait	Wait until NTP server reachable
ntpsec-rs-viz	NTP data visualization
ntpsec-rs-frob	NTP configuration manipulator
ntpsec-rs-snmpd	SNMP monitoring daemon
ntpsec-rs-time	Single-shot time query tool
ntpsec-rs-sweep	Sweep through servers collecting stats
ntpsec-rs-loggps	GPS reference clock logging
ntpsec-rs-logtemp	System temperature logging