From add0d445e82e3c4600fd48360e221b74f357e941 Mon Sep 17 00:00:00 2001
From: "Yang, Wei" <wei.yang1@linux.alibaba.com>
Date: Wed, 19 Jun 2019 16:09:47 +0800
Subject: [PATCH] rootfs: configure chronyc service with makestep

The current chrony service does not step the system clock,
so add the modification to do this if the adjustment is
larger than one second

Fixes: #316

Signed-off-by: Yang, Wei <wei.yang1@linux.alibaba.com>
---
 rootfs-builder/rootfs.sh | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/rootfs-builder/rootfs.sh b/rootfs-builder/rootfs.sh
index 7e8baa6937..ebe2b710fd 100755
--- a/rootfs-builder/rootfs.sh
+++ b/rootfs-builder/rootfs.sh
@@ -395,7 +395,12 @@ if [ ${distro} == ubuntu ] || [ ${distro} == debian ] ; then
 fi
 
 info "Configure chrony file ${chrony_conf_file}"
-echo "refclock PHC /dev/ptp0 poll 3 dpoll -2 offset 0" >> ${chrony_conf_file}
+cat >> "${chrony_conf_file}" <<EOT
+refclock PHC /dev/ptp0 poll 3 dpoll -2 offset 0
+# Step the system clock instead of slewing it if the adjustment is larger than
+# one second, at any time
+makestep 1 -1
+EOT
 
 # Comment out ntp sources for chrony to be extra careful
 # Reference:  https://chrony.tuxfamily.org/doc/3.4/chrony.conf.html