[ntp] retry few times in ntpdate init script before giving up (#445229)

[Miroslav Lichvar]

commit 42f496417dc12ecd3cad5a64ac683b2da4aa7a43
Author: Miroslav Lichvar <mlichvar at redhat.com>
Date:   Mon Aug 23 14:51:26 2010 +0200

    retry few times in ntpdate init script before giving up (#445229)

 ntpdate.init      |   13 +++++++++++--
 ntpdate.sysconfig |    5 ++++-
 2 files changed, 15 insertions(+), 3 deletions(-)
---
diff --git a/ntpdate.init b/ntpdate.init
index d12a8cc..a90c254 100755
--- a/ntpdate.init
+++ b/ntpdate.init
@@ -44,8 +44,17 @@ start() {
 	fi
 
 	echo -n $"$prog: Synchronizing with time server: "
-	/usr/sbin/ntpdate $OPTIONS $tickers &> /dev/null
-	RETVAL=$?
+
+	[ -z "$RETRIES" ] && RETRIES=2
+	retry=0
+	while true; do
+		/usr/sbin/ntpdate -U ntp -s -b $OPTIONS $tickers &> /dev/null
+		RETVAL=$?
+		[ $RETVAL -eq 0 ] || [ $retry -ge "$RETRIES" ] && break
+		sleep $[10 * (1 << $retry)]
+		retry=$[$retry + 1]
+	done
+
 	[ $RETVAL -eq 0 ] && success || failure
 	echo
 	if [ $RETVAL -eq 0 ]; then
diff --git a/ntpdate.sysconfig b/ntpdate.sysconfig
index 667093a..35bd732 100644
--- a/ntpdate.sysconfig
+++ b/ntpdate.sysconfig
@@ -1,5 +1,8 @@
 # Options for ntpdate
-OPTIONS="-U ntp -s -b"
+OPTIONS="-q 2"
+
+# Number of retries before giving up
+RETRIES=2
 
 # Set to 'yes' to sync hw clock after successful ntpdate
 SYNC_HWCLOCK=no