update example ntp.script
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>
diff --git a/examples/var_service/ntpd/ntp.script b/examples/var_service/ntpd/ntp.script
index 76c34bf..8542181 100755
--- a/examples/var_service/ntpd/ntp.script
+++ b/examples/var_service/ntpd/ntp.script
@@ -10,12 +10,30 @@
dt=`date '+%Y-%m-%d %H:%M:%S'`
+echo "`tail -n 199 -- "$0.log" 2>/dev/null`" >"$0.log.$$"
+
+if test x"$1" = x"unsync" \
+; then
+ # No replies for our NTP requests were seen for some time.
+ #
+ # Among more mundate cases like network outages, this happens
+ # if we ran for a LONG time (days) and ntp server's IP has changed.
+ # ntpd has no code to re-resolve peers' addresses to IPs,
+ # we need to help it:
+ #
+ echo "$dt: $1"\
+ "syncronization lost, restarting ntpd"\
+ >>"$0.log.$$"
+ mv -- "$0.log.$$" "$0.log"
+ kill $PPID
+ exit
+fi
+
if test x"$stratum" != x"" \
&& test x"$poll_interval" != x"" \
&& test 4 -ge "$stratum" \
&& test 128 -le "$poll_interval" \
; then
- echo "`tail -n 199 -- "$0.log" 2>/dev/null`" >"$0.log.$$"
echo "$dt: $1"\
"freq_drift_ppm=$freq_drift_ppm"\
"offset=$offset"\
@@ -27,7 +45,6 @@
exec hwclock --systohc
fi
-echo "`tail -n 199 -- "$0.log" 2>/dev/null`" >"$0.log.$$"
echo "$dt: $1"\
"freq_drift_ppm=$freq_drift_ppm"\
"offset=$offset"\