Make sure loh_helpers is sourced only once

log_helpers

@@ -1,11 +1,8 @@
 #!/bin/bash
 # set -x 
 
-#if [ ${log_helpers_sourced:-1} = "1" ]; then
-#    readonly log_helpers_sourced=${BASH_SOURCE[0]}
-#else
-#    return 0
-#fi 
+if [ ${log_helpers_sourced:-1} = "1" ]; then    # include ony once
+    readonly log_helpers_sourced=${BASH_SOURCE[0]}
 
     readonly log_file=/var/log/update_controller.log
     if ! [ -f "$log_file" ]; then
@@ -79,5 +76,5 @@ log_fatal() {
             exit 1
         fi
     }
-
-# log "test message1" "test message2"
+###############################################################################
+fi ### include guard