[WIP]vdo_test : adding VDO testing files.

roles/backend_setup/molecule/vdo/Dockerfile.j2

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+# Molecule managed
+
+{% if item.registry is defined %}
+FROM {{ item.registry.url }}/{{ item.image }}
+{% else %}
+FROM {{ item.image }}
+{% endif %}
+
+RUN if [ $(command -v apt-get) ]; then apt-get update && apt-get install -y python sudo bash ca-certificates && apt-get clean; \
+    elif [ $(command -v dnf) ]; then dnf makecache && dnf --assumeyes install python sudo python-devel python2-dnf bash && dnf clean all; \
+    elif [ $(command -v yum) ]; then yum makecache fast && yum install -y python sudo yum-plugin-ovl bash && sed -i 's/plugins=0/plugins=1/g' /etc/yum.conf && yum clean all; \
+    elif [ $(command -v zypper) ]; then zypper refresh && zypper install -y python sudo bash python-xml && zypper clean -a; \
+    elif [ $(command -v apk) ]; then apk update && apk add --no-cache python sudo bash ca-certificates; \
+    elif [ $(command -v xbps-install) ]; then xbps-install -Syu && xbps-install -y python sudo bash ca-certificates && xbps-remove -O; fi
+
+RUN yum install -y lvm2 util-linux libudev-devel libselinux-python gcc python-virtualenv xfsprogs policycoreutils-python PyYAML vdo kmod-kvdo

roles/backend_setup/molecule/vdo/INSTALL.rst

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+*******
+Docker driver installation guide
+*******
+
+Requirements
+============
+
+* General molecule dependencies (see https://molecule.readthedocs.io/en/latest/installation.html)
+* Docker Engine
+* docker-py
+* docker
+
+Install
+=======
+
+Ansible < 2.6
+
+.. code-block:: bash
+
+    $ sudo pip install docker-py
+
+Ansible >= 2.6
+
+.. code-block:: bash
+
+    $ sudo pip install docker

roles/backend_setup/molecule/vdo/molecule.yml

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+---
+dependency:
+  name: galaxy
+driver:
+  name: docker
+lint:
+  name: yamllint
+platforms:
+  - name: instance
+    image: centos/systemd
+    command: /sbin/init
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:ro
+      - /dev:/dev:rw
+    privileged: true
+provisioner:
+  name: ansible
+  lint:
+    name: ansible-lint
+scenario:
+  name: vdo
+verifier:
+  name: testinfra
+  lint:
+    name: flake8

roles/backend_setup/molecule/vdo/playbook.yml

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+---
+- name: Converge
+  hosts: all
+  roles:
+    - role: backend_setup
+      vars:
+        # Set a disk type. Options: JBOD, RAID6, RAID10 - Default: JBOD
+        gluster_infra_disktype: RAID10
+        gluster_infra_dalign: 256K
+        gluster_infra_diskcount: 10
+        gluster_infra_stripe_unit_size: 128
+        gluster_infra_vdo:
+          - name: hc_vdo_1
+            device: /dev/loop0
+            slabsize: 128M
+        gluster_infra_volume_groups:
+          - vgname: vg_vdb
+            pvname: /dev/mapper/hc_vdo_1
+        gluster_infra_thick_lvs:
+          - vgname: vg_vdb
+            lvname: vg_vdb_thicklv1
+            size: 1G
+        gluster_infra_thinpools:
+          - vgname: vg_vdb
+            thinpoolname: foo_thinpool
+            thinpoolsize: 400M
+            poolmetadatasize: 200M
+        gluster_infra_lv_logicalvols:
+          - vgname: vg_vdb
+            thinpool: foo_thinpool
+            lvname: vg_vdb_thinlv
+            lvsize: 500M
+        gluster_infra_mount_devices:
+          - path: /mnt/thicklv
+            vgname: vg_vdb
+            lvname: vg_vdb_thicklv1
+          - path: /mnt/thinlv1
+            vgname: vg_vdb
+            lvname: vg_vdb_thinlv

roles/backend_setup/molecule/vdo/prepare.yml

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+---
+- name: Prepare
+  hosts: all
+  tasks:
+  - name: Allocate space to a file
+    command: "fallocate -l 5G /var/{{item}}"
+    args:
+      creates: "/var/{{item}}"
+    with_items:
+      - data0
+      - data1
+  - name: Create loopback devices
+    command: "losetup -f /var/{{item.1}}"
+    with_together:
+      - ['loop0', 'loop1']
+      - ['data0', 'data1']
+    loop_control:
+      pause: 5

roles/backend_setup/molecule/vdo/tests/test_default.py

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+import os
+
+import testinfra.utils.ansible_runner
+
+testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
+    os.environ['MOLECULE_INVENTORY_FILE']).get_hosts('all')
+
+
+def test_hosts_file(host):
+    f = host.file('/etc/hosts')
+
+    assert f.exists
+    assert f.user == 'root'
+    assert f.group == 'root'