[slx-clock] add ntp-sync script

1 files changed, 55 insertions, 0 deletions

diff --git a/builder/modules.d/slx-clock/scripts/ntp-sync.sh b/builder/modules.d/slx-clock/scripts/ntp-sync.sh
new file mode 100755
index 00000000..887d5b13
--- /dev/null
+++ b/builder/modules.d/slx-clock/scripts/ntp-sync.sh
@@ -0,0 +1,55 @@
+#!/bin/ash
+# Sync time via network
+
+. /etc/openslx
+
+ntp_sync() {
+	# Try to merge with servers from DHCP. Prefer DHCP, skip duplicates
+	for SERVER in $SLX_NTP_SERVER; do
+		if ! echo "$SLX_DHCP_NTP" | grep -wq "$SERVER"; then
+			SLX_DHCP_NTP="$SLX_DHCP_NTP $SERVER"
+		fi
+	done
+	local SUCCESS=
+	for SERVER in $SLX_DHCP_NTP; do
+		if ntpdate -u -p 2 "$SERVER"; then
+			echo "Successfully queried $SERVER for time."
+			if [ "x$SLX_BIOS_CLOCK" = "xlocal" ]; then
+				usleep 100000
+				hwclock -l -w || echo "... but could not set BIOS clock to localtime"
+			elif [ "x$SLX_BIOS_CLOCK" = "xutc" ]; then
+				usleep 100000
+				hwclock -u -w || echo "... but could not set BIOS clock to UTC"
+			fi
+			SUCCESS=1
+			break
+		fi
+		echo "Error querying $SERVER for current time."
+	done
+	if [ -z "$SUCCESS" ]; then
+		echo "No NTP server reachable"
+		# See if we have a timestamp in our server-config - should only be a few seconds off by now
+		if [ -n "$SLX_NOW" ] && [ "$SLX_NOW" -gt 1234567890 ]; then
+			TTS="$SLX_NOW"
+			if [ -n "$CONFIG_DOWNLOAD_TIME" ]; then
+				NOW_TIME=$(sed -r 's/^([0-9]+)\.([0-9]+).*$/\1\2/' /proc/uptime)
+				if [ "$CONFIG_DOWNLOAD_TIME" -gt 0 ] && [ "$NOW_TIME" -gt 0 ]; then
+					TTS=$(( TTS + ( NOW_TIME - CONFIG_DOWNLOAD_TIME ) / 100 ))
+				fi
+			fi
+			echo "Setting time to SLX_NOW ($SLX_NOW, corrected $TTS)"
+			date -s "@$TTS"
+		else
+			echo "No fallback option for timesync available, relying on correct RTC setup"
+			if [ "x$SLX_BIOS_CLOCK" = "xlocal" ]; then
+				# Linux defaults to RTC = UTC, so read again in this case
+				hwclock -l -s
+			fi
+		fi
+	fi
+}
+
+ntp_sync &
+
+true
+