playbooks: bifrost-create-dib-image: Add required dib packages

mkfs.ext4 is used when building dib images so we need to make sure
it's installed on the host. This adds a new dib_host_required_packages
list to denote which packages are required on the host for the dib
process to work properly.

Change-Id: I7701e4525b6b6a4e01a324d724d139e9d7466d19

playbooks/roles/bifrost-create-dib-image/tasks/main.yml

@@ -13,6 +13,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 ---
+- name: Ensure required packages are installed
+  package:
+    name: "{{ dib_host_required_packages }}"
+    state: present
 # If attempting to utilize a base Ubuntu image, diskimage-builder
 # is the recommended, and default path.
 - name: "Test if image is present"

playbooks/roles/bifrost-create-dib-image/vars/main.yml

@@ -0,0 +1,16 @@
+# Copyright (c) 2017 SUSE Linux GmbH.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+dib_host_required_packages:
+  - e2fsprogs