1186894f77
Handle an interesting corner case when NTP server is reachable... but on a different IP now. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
55 lines
1.4 KiB
Bash
Executable File
55 lines
1.4 KiB
Bash
Executable File
#!/bin/sh
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# Note that there is no provision to prevent several copies of the script
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# to be run in quick succession. In fact, it happens rather often
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# if initial syncronization results in a step.
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# You will see "step" and then "stratum" script runs, sometimes
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# as close as only 0.002 seconds apart.
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#
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# Script should be ready to deal with this.
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dt=`date '+%Y-%m-%d %H:%M:%S'`
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echo "`tail -n 199 -- "$0.log" 2>/dev/null`" >"$0.log.$$"
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if test x"$1" = x"unsync" \
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; then
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# No replies for our NTP requests were seen for some time.
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#
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# Among more mundate cases like network outages, this happens
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# if we ran for a LONG time (days) and ntp server's IP has changed.
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# ntpd has no code to re-resolve peers' addresses to IPs,
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# we need to help it:
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#
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echo "$dt: $1"\
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"syncronization lost, restarting ntpd"\
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>>"$0.log.$$"
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mv -- "$0.log.$$" "$0.log"
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kill $PPID
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exit
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fi
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if test x"$stratum" != x"" \
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&& test x"$poll_interval" != x"" \
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&& test 4 -ge "$stratum" \
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&& test 128 -le "$poll_interval" \
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; then
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echo "$dt: $1"\
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"freq_drift_ppm=$freq_drift_ppm"\
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"offset=$offset"\
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"stratum=$stratum"\
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"poll_interval=$poll_interval,"\
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"setting hardware clock"\
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>>"$0.log.$$"
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mv -- "$0.log.$$" "$0.log"
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exec hwclock --systohc
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fi
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echo "$dt: $1"\
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"freq_drift_ppm=$freq_drift_ppm"\
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"offset=$offset"\
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"stratum=$stratum"\
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"poll_interval=$poll_interval"\
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>>"$0.log.$$"
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mv -- "$0.log.$$" "$0.log"
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