Add xfs ftype check during install

Since we know xfs ftype=0 is incompatible with the container usage,
let's fail hard with a message if the system has an improperly
configured filesystem.

Change-Id: I06f80003d7f3f6443f75f39973d4e68ac24673be
Related-Bug: #1765121

tasks/docker.yml

@@ -10,6 +10,31 @@
     state: present
     reload: yes
 
+# NOTE(aschultz): LP#1765121 - need to check that we don't have any ftype=0
+# volumes because other wise docker is very unhappy
+- name: Check if there are XFS volumes with ftype=0
+  become: true
+  shell: |
+    for dev in $(df -h | grep '/dev/' | grep -v 'tmp' | cut -d' ' -f1)
+    do
+      parseftype=$(xfs_info $dev | grep ftype=0);
+      if [[ ! -z "$parseftype" ]]; then
+        ftype="ftype=0";
+        break;
+      fi
+    done
+    echo $ftype;
+  register: ftype
+  changed_when: false
+
+- name: Check ftype
+  fail:
+    msg: >
+      XFS volumes formatted using ftype=0 are incompatible
+      with the docker overlayfs driver.
+  when:
+    - ftype.stdout == 'ftype=0'
+
 - name: ensure docker is installed
   package:
     name: docker