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#!/bin/bash
. /opt/openslx/config
[ -z "$SLX_NTP_SERVER" ] && exit 0
declare -a cmd
if command -v ntpdate &> /dev/null; then
cmd=( ntpdate )
ntpdate --help 2>&1 | grep -q '\s-B\s' && cmd+=( -B )
ntpdate --help 2>&1 | grep -q '\s-t\s' && cmd+=( -t 5 )
elif command -v ntpdig &> /dev/null; then
cmd=( ntpdig )
ntpdig --help 2>&1 | grep -q '\s-s\s' && cmd+=( -s )
ntpdig --help 2>&1 | grep -q '\s-t\s' && cmd+=( -t 5 )
ntpdig --help 2>&1 | grep -q '\s-p\s' && cmd+=( -p 2 )
elif busybox ntpd --help &> /dev/null; then
command -v timeout &> /dev/null && cmd=( timeout 5 )
cmd+=( busybox ntpd -q -n -p )
fi
# Random delay if not run on terminal
[ -t 0 ] || sleep $(( RANDOM % 60 ))
for srv in $SLX_NTP_SERVER; do
"${cmd[@]}" "$srv" || continue
# Success
echo "Time updated from NTP"
command -v hwclock &> /dev/null || exit 0
sleep 1
if [ "$SLX_BIOS_CLOCK" = "local" ]; then
hwclock -l -w || echo "... but could not set BIOS clock to localtime"
elif [ "$SLX_BIOS_CLOCK" = "utc" ]; then
hwclock -u -w || echo "... but could not set BIOS clock to UTC"
fi
exit 0
done
echo 'No NTP server reachable!'
exit 1
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