move check for database.yml to functions file

contrib/backup/functions

@@ -48,3 +48,11 @@ function backup_db () {
     fi
 }
 
+function check_database_config_exists () {
+    if [ -f ${ZAMMAD_DIR}/${DATABASE_CONFIG} ]; then
+	get_db_credentials
+    else
+	echo "${ZAMMAD_DIR}/${DATABASE_CONFIG} is missing. is zammad configured yet?"
+	exit 1
+    fi
+}

contrib/backup/zammad_backup.sh

@@ -11,15 +11,10 @@ PATH=/sbin:/bin:/usr/sbin:/usr/bin:
 # import functions
 . functions
 
+# exec backup
 delete_old_backups
 
-# check if database.yml exists
-if [ -f ${ZAMMAD_DIR}/${DATABASE_CONFIG} ]; then
-    get_db_credentials
-else
-    echo "${ZAMMAD_DIR}/${DATABASE_CONFIG} is missing. is zammad configured yet?"
-    exit 1
-fi
+check_database_config_exists
 
 get_backup_date