datavol: Playbook to provision a data volume

The `datavol.yml` playbook can provision one or more data volumes on
a managed node, using the definitions in the `data_volumes` variable.
This variable must contain a list of dictionaries with the following
keys:

* `dev`: The block device where the data volume is stored (e.g.
  `/dev/vdb`)
* `fstype`: The type of filesystem to create on the block device
* `mountpoint`: The location in the filesystem hierarchy where the
  volume is mounted
* `opts`: (Optional) options to pass to the `mkfs` program when
  formatting the device
* `mountopts`: (Optional) additional options to pass to the `mount`
  program when mounting the filesystem

datavol.yml

@@ -0,0 +1,52 @@
+- hosts: all
+  vars:
+    mkfs_package:
+      btrfs: btrfs-progs
+      ext2: e2fsprogs
+      ext3: e2fsprogs
+      ext4: e2fsprogs
+      xfs: xfsprogs
+
+  tasks:
+  - name: ensure filesystem tools are installed
+    package:
+      name: >-
+        {{
+          data_volumes
+          | map(attribute='fstype')
+          | map('extract', mkfs_package)
+          | list
+        }}
+    tags:
+    - install
+
+  - name: ensure data volume filesystem exists
+    filesystem:
+      dev: '{{ item.dev }}'
+      fstype: '{{ item.fstype }}'
+      opts: '{{ item.opts|d(omit) }}'
+    loop: '{{ data_volumes|d([]) }}'
+    tags:
+    - mkfs
+
+  - name: ensure data volume is mounted
+    mount:
+      path: '{{ item.mountpoint }}'
+      src: '{{ item.dev }}'
+      fstype: '{{ item.fstype }}'
+      opts: '{{ item.mountopts|d(omit) }}'
+      state: mounted
+    loop: '{{ data_volumes|d([]) }}'
+    notify:
+    - reload systemd
+    - fix data volume selinux context
+
+  handlers:
+  - name: reload systemd
+    systemd:
+      daemon_reload: true
+
+  - name: fix data volume selinux context
+    command:
+      restorecon -RF {{ item.mountpoint }}
+    loop: '{{ data_volumes }}'