[reboot] While rebooting device, execute platform specific reboot tool when available (#188)

* [fast-reboot] Explicitly call Linux native reboot tool

* [reboot tool] Reboot device with platform specific tool when available

/usr/bin is in front of /sbin in search path. Adding reboot script here
will get executed when reboot was called without absolute path.

This script will call platform specific reboot tool (name: platform_reboot
under device folder) when available. Otherwise, dispatch to native Linux
reboot.

* [reboot] call sync before calling platform specific reboot tool

The platform specific reboot tool could be power cycling.

* [reboot] sleep 3 seconds after sync-ing

* [reboot] also stop snmp service

Author: yxieca

scripts/fast-reboot

@@ -59,6 +59,6 @@ sync
 sleep 1
 sync
 
-# Reboot
+# Reboot: explicity call Linux native reboot under sbin
 echo "Rebooting to $NEXT_SONIC_IMAGE..."
-reboot
+/sbin/reboot

scripts/reboot

@@ -0,0 +1,28 @@
+#! /bin/bash
+
+function stop_sonic_services()
+{
+    echo "Stopping sonic services..."
+    systemctl stop swss
+    systemctl stop teamd
+    systemctl stop bgp
+    systemctl stop lldp
+    systemctl stop snmp
+}
+
+# Obtain our platform as we will mount directories with these names in each docker
+PLATFORM=`sonic-cfggen -v platform`
+
+DEVPATH="/usr/share/sonic/device"
+REBOOT="platform_reboot"
+
+if [ -x ${DEVPATH}/${PLATFORM}/${REBOOT} ]; then
+    stop_sonic_services
+    sync
+    sleep 3
+    echo "Rebooting with platform ${PLATFORM} specific tool ..."
+    ${DEVPATH}/${PLATFORM}/${REBOOT}
+    exit 0
+fi
+
+/sbin/reboot $@

setup.py

@@ -49,6 +49,7 @@ def get_test_suite():
         'scripts/port2alias',
         'scripts/portconfig',
         'scripts/portstat',
+        'scripts/reboot',
         'scripts/teamshow'
     ],
     data_files=[