updated to allow deployment to be driven by a configuration file
diff --git a/roles/head-node/files/compute-node.yml.j2 b/roles/head-node/files/compute-node.yml.j2
new file mode 100644
index 0000000..4a6a50d
--- /dev/null
+++ b/roles/head-node/files/compute-node.yml.j2
@@ -0,0 +1,4 @@
+- hosts: all
+  remote_user: ubuntu
+  roles:
+    - {{ provision.role }}
diff --git a/roles/head-node/tasks/main.yml b/roles/head-node/tasks/main.yml
index 3eb2785..a9f5e60 100644
--- a/roles/head-node/tasks/main.yml
+++ b/roles/head-node/tasks/main.yml
@@ -9,7 +9,7 @@
 - name: Ensure Ansible Compute Config Files
   become: yes
   git:
-    repo=http://gerrit.opencord.org/maas
+    repo={{ provision.location }}
     dest=/tmp/ansible.maas
     clone=yes
     force=yes
@@ -17,20 +17,16 @@
 
 - name: Ensure Ansible Roles Exist
   become: yes
-  command: cp -rf /tmp/ansible.maas/{{ item }} /etc/maas/ansible
-  with_items:
-    - roles
+  command: cp -rf /tmp/ansible.maas/{{ provision.role_path }} /etc/maas/ansible
 
 - name: Ensure Ansible Roles Ownership
   become: yes
-  file: dest=/etc/maas/ansible/{{ item }} owner=maas group=maas recurse=yes
-  with_items:
-    - roles
+  file: dest=/etc/maas/ansible/{{ provision.role_path }} owner=maas group=maas recurse=yes
 
 - name: Ensure Compute Node Playbook
   become: yes
-  copy:
-    src=files/compute-node.yml
+  template:
+    src=files/compute-node.yml.j2
     dest=/etc/maas/ansible/compute-node.yml
     owner=maas
     group=maas
diff --git a/roles/head-node/vars/main.yml b/roles/head-node/vars/main.yml
new file mode 100644
index 0000000..e97daf1
--- /dev/null
+++ b/roles/head-node/vars/main.yml
@@ -0,0 +1,9 @@
+provision:
+    # CHANGE:
+    #   'location'   git URL from which to clone a repository that contains the role
+    #                definitions to be used then provisioning a compute node
+    #   'role_path'  directory path within the repo that contains the roles.
+    #   'role'       name of the role to provision for new compute nodes
+    location: "{{ prov_location | default('http://gerrit.opencord.org/maas') }}"
+    role_path: "{{ prov_role_path | default('roles') }}"
+    role: "{{ prov_role | default('compute-node') }}"