Add a script to call ntpd with a list of servers

1 files changed, 36 insertions, 0 deletions

diff --git a/scripts/ntpd-set.sh b/scripts/ntpd-set.sh
new file mode 100755
index 000000000..3581d2421
--- /dev/null
+++ b/scripts/ntpd-set.sh
@@ -0,0 +1,36 @@
+#!/bin/sh
+max_attempts=4
+try_count=0
+
+# This script takes a list of ntp servers and passes them to ntpd to set the
+# system time. If a /etc/ntpd.conf file exists, the servers there are used,
+# if not, some default values are passed
+set_time() {
+    ntpd -n -p $1;
+    return $?
+}
+
+check_time() {
+    for arg ; do
+        echo $arg
+        if set_time $arg ; then
+            return 0
+        fi
+    done
+    # In case we are doing this before the network is up, try again
+    let try_count=try_count+1
+    if [ $try_count -lt $max_attempts ] ; then
+        sleep 2
+        check_time $@
+    else
+        return 1
+    fi
+}
+
+if [ -f /etc/ntpd.conf ]; then
+    server_list=`cat /etc/ntpd.conf | sed ':a;N;$!ba;s/\n/ /g;s/server//g'`
+    check_time $server_list
+else
+    # Use a default list if there's no config
+    check_time 0.pool.ntp.org 1.pool.ntp.org 2.pool.ntp.org 3.pool.ntp.org
+fi