[warm-reboot] initialize warm reboot state table before warm rebooting (#492)

* [warm-reboot] initialize warm reboot state table before warm rebooting

Make sure that when the new image boots up, the component state won't
be 'reconciled'.

Signed-off-by: Ying Xie <[email protected]>

* fix typo

* optimize state deletion

Author: yxieca

scripts/fast-reboot

@@ -106,6 +106,20 @@ function clear_warm_boot()
     fi
 }
 
+function init_warm_reboot_states()
+{
+    # If the current running instanace was booted up with warm reboot. Then
+    # the current DB contents will likely mark warm reboot is done.
+    # Clear these states so that the next boot up image won't get confused.
+    if [[ "$REBOOT_TYPE" = "warm-reboot" || "$REBOOT_TYPE" = "fastfast-reboot" ]]; then
+        redis-cli -n 6 eval "
+            for _, key in ipairs(redis.call('keys', 'WARM_RESTART_TABLE|*')) do
+                redis.call('hdel', key, 'state')
+            end
+        " 0 >/dev/null
+    fi
+}
+
 function initialize_pre_shutdown()
 {
     debug "Initialize pre-shutdown ..."
@@ -285,6 +299,8 @@ if [[ "$REBOOT_TYPE" = "fast-reboot" ]]; then
     /usr/bin/fast-reboot-dump.py -t /host/fast-reboot
 fi
 
+init_warm_reboot_states
+
 setup_control_plane_assistant
 
 if [[ "$REBOOT_TYPE" = "warm-reboot" || "$REBOOT_TYPE" = "fastfast-reboot" ]]; then