diff --git a/log_helpers b/log_helpers
index ad051e1..2148a25 100755
--- a/log_helpers
+++ b/log_helpers
@@ -1,83 +1,80 @@
 #!/bin/bash
 # set -x 
 
-#if [ ${log_helpers_sourced:-1} = "1" ]; then
-#    readonly log_helpers_sourced=${BASH_SOURCE[0]}
-#else
-#    return 0
-#fi 
-    
-readonly log_file=/var/log/update_controller.log
-if ! [ -f "$log_file" ]; then
-    touch $log_file
-fi
+if [ ${log_helpers_sourced:-1} = "1" ]; then    # include ony once
+    readonly log_helpers_sourced=${BASH_SOURCE[0]}
 
-readonly DEBUG=0
-readonly INFO=1
-readonly WARN=2
-readonly CRIT=3
-readonly ERROR=4
-readonly FATAL=5
-readonly MAX_DEBUG_LEVEL=6
-
-log_level=0
-
-set_dbg_level () {
-    if [ $1 < $MAX_DEBUG_LEVEL ]; then
-        log_level=$1
+    readonly log_file=/var/log/update_controller.log
+    if ! [ -f "$log_file" ]; then
+        touch $log_file
     fi
-}
 
-dbg_level () {
-    return $log_level
-}
+    readonly DEBUG=0
+    readonly INFO=1
+    readonly WARN=2
+    readonly CRIT=3
+    readonly ERROR=4
+    readonly FATAL=5
+    readonly MAX_DEBUG_LEVEL=6
 
-log() {
-    if [[ $(("$(wc -l < $log_file)")) -ge $((100000)) ]]; then
-        # remove first line
-        sed -e 1d -i $log_file
-    fi
-    local msg="$(date +'%Y-%m-%d_%T'): $*"
-    printf "log:$msg\n" >&2
-    printf "$msg\n" >> $log_file
-}
+    log_level=0
 
-log_debug() {
-    if [ $log_level = $DEBUG ]; then
-        log "DEBUG $*"
-    fi
-}
+    set_dbg_level () {
+        if [ $1 < $MAX_DEBUG_LEVEL ]; then
+            log_level=$1
+        fi
+    }
 
-log_info() {
-    if [ $log_level -le $INFO ]; then
-        log "INFO  $*"
-    fi
-}
+    dbg_level () {
+        return $log_level
+    }
 
-log_warn() {
-    if [ $log_level -le $WARN ]; then
-        log "WARN  $*"
-    fi
-}
+    log() {
+        if [[ $(("$(wc -l < $log_file)")) -ge $((100000)) ]]; then
+            # remove first line
+            sed -e 1d -i $log_file
+        fi
+        local msg="$(date +'%Y-%m-%d_%T'): $*"
+        printf "log:$msg\n" >&2
+        printf "$msg\n" >> $log_file
+    }
 
-log_crit() {
-    if [ $log_level -le $CRIT ]; then
-        log "CRIT  $*"
-    fi
-}
+    log_debug() {
+        if [ $log_level = $DEBUG ]; then
+            log "DEBUG $*"
+        fi
+    }
 
-log_error() {
-    if [ $log_level -le $ERROR ]; then
-        log "ERROR  $*"
-    fi
-}
+    log_info() {
+        if [ $log_level -le $INFO ]; then
+            log "INFO  $*"
+        fi
+    }
 
-log_fatal() {
-    if [ $log_level -le $FATAL ]; then
-        log "FATAL  $*"
-        log "exiting ..."
-        exit 1
-    fi
-}
+    log_warn() {
+        if [ $log_level -le $WARN ]; then
+            log "WARN  $*"
+        fi
+    }
 
-# log "test message1" "test message2"
+    log_crit() {
+        if [ $log_level -le $CRIT ]; then
+            log "CRIT  $*"
+        fi
+    }
+
+    log_error() {
+        if [ $log_level -le $ERROR ]; then
+            log "ERROR  $*"
+        fi
+    }
+
+    log_fatal() {
+        if [ $log_level -le $FATAL ]; then
+            log "FATAL  $*"
+            log "exiting ..."
+            exit 1
+        fi
+    }
+###############################################################################
+fi ### include guard