Regenerate list of SMART disk only if too old

xymon/plugins/client/ext/smartoverall

@@ -158,11 +158,13 @@ choose_correct_type() {
 # Create or empty previous files
 true > "${plugin_result}"
 true > "${plugin_state}"
-true > "${device_list}"
+regenerate_if_too_old "${device_list}" 1440
 true > "${drivedb_list}"
 
-# Get the list of all available devices
-smartctl --scan >> "${device_list}"
+# Get the list of all available devices if the previous list was emptied
+if test ! -s "${device_list}"; then
+	smartctl --scan >> "${device_list}"
+fi
 
 # If the file is not empty
 if test -s "${device_list}"; then