[warm-reboot] Check if warm restart flag is set when issuing a warm-reboot (sonic-net#1460)

Check if any warm restart flag is set when issuing a warm-reboot. This check avoids starting a warm reboot while another warm restart is in progress. In the scenario where a warm reboot is issued with another warm restart in progress, the warm restart flag may be reset and part of the components have a risk of doing cold reboot.

Author: shi-su

scripts/fast-reboot

@@ -398,6 +398,19 @@ function save_counters_folder() {
     fi
 }
 
+function check_warm_restart_in_progress() {
+    sonic-db-cli STATE_DB keys "WARM_RESTART_ENABLE_TABLE|*" | while read key ; do
+        if [[ x"$(sonic-db-cli STATE_DB hget $key enable)" == x"true" ]]; then
+            if [[ x"${FORCE}" == x"yes" ]]; then
+                debug "Ignoring warm restart flag for ${key#*|}"
+            else
+                echo "Warm restart flag for ${key#*|} is set. Please check if a warm restart for ${key#*|} is in progress."
+                exit "${EXIT_FAILURE}"
+            fi
+        fi
+    done
+}
+
 # main starts here
 parseOptions $@
 
@@ -419,6 +432,7 @@ case "$REBOOT_TYPE" in
         sonic-db-cli STATE_DB SET "FAST_REBOOT|system" "1" "EX" "180" &>/dev/null
         ;;
     "warm-reboot")
+        check_warm_restart_in_progress
         if [[ "$sonic_asic_type" == "mellanox" ]]; then
             REBOOT_TYPE="fastfast-reboot"
             BOOT_TYPE_ARG="fastfast"