diff --git a/mirror-image/scripts/salt_bootstrap.sh b/mirror-image/scripts/salt_bootstrap.sh
index 9732123..8dec3ce 100644
--- a/mirror-image/scripts/salt_bootstrap.sh
+++ b/mirror-image/scripts/salt_bootstrap.sh
@@ -1,6 +1,7 @@
 #!/bin/bash -xe
 
-# CLUSTER_MODEL_REF=
+CLUSTER_MODEL_REF=${CLUSTER_MODEL_REF:-master}
+FORMULA_VERSION=${FORMULA_VERSION:-testing}
 SALTSTACK_GPG=${SALTSTACK_GPG:-"https://repo.saltstack.com/apt/ubuntu/16.04/amd64/2016.3/SALTSTACK-GPG-KEY.pub"}
 SALTSTACK_REPO=${SALTSTACK_REPO:-"http://repo.saltstack.com/apt/ubuntu/16.04/amd64/2016.3 xenial main"}
 APT_MIRANTIS_GPG=${APT_MIRANTIS_GPG:-"http://apt.mirantis.com/public.gpg"}
@@ -27,8 +28,9 @@
 export APT_REPOSITORY=" deb [arch=amd64] ${APT_MIRANTIS_SALT_REPO} "
 export APT_REPOSITORY_GPG=${APT_MIRANTIS_GPG}
 if [[ ! -z "${PACKER_OFFLINE_BUILD}" ]];then
-  echo "offline detected!"
-  export BOOTSTRAP_SALTSTACK_COM="http://${PACKER_HTTP_ADDR}/bootstrap.saltstack.com.sh"
+  echo "INFO: build in offline detected!"
+  export BOOTSTRAP_SALTSTACK_COM="file:///tmp/bootstrap.saltstack.com.sh"
+  # extra opts will push bootstrap script NOT install upstream repos.
   export BOOTSTRAP_SALTSTACK_OPTS=${BOOTSTRAP_SALTSTACK_OPTS:- -dXr $BOOTSTRAP_SALTSTACK_VERSION }
 fi
 #