うるう秒ゆっくり同期していってね | ^o^　 |

slew_batch.sh

#!/bin/bash

UPSTREAMORIG_NTP_CONF=/etc/ntp.conf.upstream
NO_UPSTREAMORIG_NTP_CONF=/etc/ntp.conf.no_upstream
NTP_CONF=/etc/ntp.conf


# check

if [ ! -e $UPSTREAMORIG_NTP_CONF ]; then
    echo "Not found $UPSTREAMORIG_NTP_CONF"
    exit 1
fi

if [ ! -e $NO_UPSTREAMORIG_NTP_CONF ]; then
    echo "Not found $NO_UPSTREAMORIG_NTP_CONF"
    exit 1
fi

export PATH=/bin:/usr/bin:/sbin:/usr/sbin

print_date() {
    N=$1
    echo $1 "$(date +%Y-%m-%dT%H:%M:%S) "
}

syslog() {
    logger -t slew_batch -p user.info "$1"
}

syslog_and_echo() {
    logger -t slew_batch -p user.info "$1"
    print_date -n
    echo "$1"
}

log_ntpdate() {
    msg=$(ntpdate -q 210.173.160.27 | head -1)
    syslog_and_echo "$msg"
}


# 1ループで15msぐらいずつ合わせる
# 無限ループで手で止める。
n=0
while true; do
    n=$(($n + 1))
    print_date -n
    syslog_and_echo "[loop:$n]"

    # 上位NTPサーバに向ける
    syslog_and_echo "Connecting to MFEED"

    log_ntpdate

    sudo cp "$UPSTREAMORIG_NTP_CONF" "$NTP_CONF"
    sudo /sbin/service ntpd restart

    # 40秒まつ(0.5ms * 40s = 最大20msだけずらす: 実際はiburst同期で実績15msくらい)
    wait=40
    wait_notify_interval=10
    wait_start=$(date +%s)
    wait_notify=$wait_start
    syslog_and_echo "Waiting $wait secs"
    while [ $(($(date +%s) - $wait_start)) -le $wait ]; do
        if [ $(($(date +%s) - $wait_notify)) -ge $wait_notify_interval ]; then
            # $wait_notify_interval ごとにntpdate表示
            # 時間かかるので先にwait_notify更新
            wait_notify=$(date +%s)
            log_ntpdate
        fi
        sleep 1
    done

    # sysclock => hwclock
    syslog_and_echo "Sync to hwclock"
    log_ntpdate

    sudo /sbin/hwclock --systohc

    # 上位NTPサーバを外しhwclockのみ見るようにする
    syslog_and_echo "Disconnecting from MFEED. Only hwclock"

    sudo cp "$NO_UPSTREAMORIG_NTP_CONF" "$NTP_CONF"
    sudo /sbin/service ntpd restart

    # 1024s(default max poll) + 60s(予備) = 1084s まつ
    wait=1084
    wait_notify_interval=100
    wait_start=$(date +%s)
    wait_notify=$wait_start
    syslog_and_echo "Waiting $wait secs"
    while [ $(($(date +%s) - $wait_start)) -le $wait ]; do
        # こちらは待つだけなのでピリオド表示
        if [ $(($(date +%s) - $wait_notify)) -ge $wait_notify_interval ]; then
            # $wait_notify_interval ごとに経過秒数とntpdateを表示
            echo "[$(($(date +%s) - $wait_start))]"
            log_ntpdate

            wait_notify=$(date +%s)
        fi
        # 長く待っても大丈夫なので10秒でsleep
        sleep 10
        echo -n "."
    done
    echo

done