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ddns-scripts: stash the next check time

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Calculating the next check time based on the last update time is not
very accurate if the next check is a large multiple forwards from the
last update time because the cumulative sleeps and wake times are not
exact but best effort of the OS. Other factors including clock-drift
give rise to a larger time discrepancy the further the next update is in
the future.

Stash the next check time which should be quite accurate since it's
only one sleep instance away. This is also for use in the GUI.

Tested on 24.10.2

Signed-off-by: Paul Donald <newtwen+github@gmail.com>
This commit is contained in:
Paul Donald
2025-09-19 01:21:05 +02:00
committed by Florian Eckert
parent 296c15c1f2
commit 1463d79bdf
2 changed files with 6 additions and 2 deletions
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6
net/ddns-scripts/files/usr/lib/ddns/dynamic_dns_updater.sh
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@@ -102,6 +102,7 @@ esac
# set file names
PIDFILE="$ddns_rundir/$SECTION_ID.pid" # Process ID file
UPDFILE="$ddns_rundir/$SECTION_ID.update" # last update successful send (system uptime)
CHKFILE="$ddns_rundir/$SECTION_ID.nextcheck" # next check (system uptime + check interval)
DATFILE="$ddns_rundir/$SECTION_ID.dat" # save stdout data of WGet and other extern programs called
ERRFILE="$ddns_rundir/$SECTION_ID.err" # save stderr output of WGet and other extern programs called
IPFILE="$ddns_rundir/$SECTION_ID.ip" #
@@ -397,7 +398,10 @@ while : ; do
# now we wait for check interval before testing if update was recognized
[ $DRY_RUN -eq 0 ] && {
write_log 7 "Waiting $CHECK_SECONDS seconds (Check Interval)"
get_uptime NOW_TIME
echo $(($NOW_TIME + $CHECK_SECONDS)) > $CHKFILE # save the next scheduled check time
NEXT_CHECK_TIME=$( date -d @$(( $(date +%s) + $CHECK_SECONDS )) +"$ddns_dateformat" )
write_log 7 "Waiting $CHECK_SECONDS seconds (Check Interval); Next check at $NEXT_CHECK_TIME"
sleep $CHECK_SECONDS &
PID_SLEEP=$!
wait $PID_SLEEP # enable trap-handler