base-files: For sysfixtime use hwclock if RTC available

On systems that have an RTC prefer it to the file-based time fixup (i.e.
use hwclock when there is a permanent clock instead of the faked up time
logic that is needed when there is not RTC).

We can't rely on hctosys kernel feature either as we're usually using
RTC as kernel modules which are usually being loaded after hctosys was
run, leading in the following error:

  hctosys: unable to open rtc device (rtc0)

Signed-off-by: Daniel Dickinson <openwrt@daniel.thecshore.com>
Signed-off-by: Petr Štetiar <ynezz@true.cz>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@48661 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/base-files/files/etc/init.d/sysfixtime b/package/base-files/files/etc/init.d/sysfixtime
index 4010e06..ab946f6 100755 (executable)
--- a/package/base-files/files/etc/init.d/sysfixtime
+++ b/package/base-files/files/etc/init.d/sysfixtime
@@ -2,10 +2,24 @@
 # Copyright (C) 2013-2014 OpenWrt.org
 
 START=00
+STOP=90
+
+RTC_DEV=/dev/rtc0
+HWCLOCK=/sbin/hwclock
 
 boot() {
+       start && exit 0
+
        local curtime="$(date +%s)"
        local maxtime="$(find /etc -type f -exec date -r {} +%s \; | sort -nr | head -n1)"
        [ $curtime -lt $maxtime ] && date -s @$maxtime
 }
 
+start() {
+       [ -e "$RTC_DEV" ] && [ -e "$HWCLOCK" ] && $HWCLOCK -s -f $RTC_DEV
+}
+
+stop() {
+       [ -e "$RTC_DEV" ] && [ -e "$HWCLOCK" ] && $HWCLOCK -w -f $RTC_DEV && \
+               logger -t sysfixtime "saved '$(date)' to $RTC_DEV"
+}