fwbank: Add support to keep_settings

package/base-files/files/usr/libexec/rpcd/fwbank

@@ -22,7 +22,7 @@ fwbank_get_bootbank() {
 
 case "$1" in
 	list)
-		echo '{ "dump" : {}, "set_bootbank" : {"bank":32} , "upgrade": {"path":"String","auto_activate":true,"bank":32}}'
+		echo '{ "dump" : {}, "set_bootbank" : {"bank":32} , "upgrade": {"path":"String","auto_activate":true,"bank":32,"keep_settings":true}}'
 	;;
 	call)
 		case "$2" in
@@ -126,6 +126,7 @@ case "$1" in
 				json_get_var path path
 				json_get_var auto_activate auto_activate
 				json_get_var bank bank
+				json_get_var keep_settings keep_settings
 
 				ret=0
 
@@ -147,6 +148,9 @@ case "$1" in
 					exit
 				}
 
+				# Set the default value for keep_settings
+				keep_settings=${keep_settings:-1}
+
 				# This ubus call does not reboot the system at any one time.
 				# Although, the newly upgraded bank is activated by default.
 				# Thus, pass "--no-reboot" if the bank is to be activated,
@@ -158,6 +162,11 @@ case "$1" in
 					sysupgrade_flag="--no-activate"
 				fi
 
+				# Set the flag to do not save configuration over reflash
+				if [ "${keep_settings}" -eq 0 ]; then
+					sysupgrade_flag="${sysupgrade_flag} -n"
+				fi
+
 				# Call sysupgrade synchonously. It should not time out the ubus call,
 				# as it will just verify the image and do an ubus call, leading to
 				# do_stage2 doing the actual upgrade.