commit 949ed03de5428c90c728aa8ad1e1c7bd85374622
Author: Pierre Riteau <pierre@stackhpc.com>
Date:   Tue Oct 13 23:11:16 2020 +0200

    Fix failures in Docker storage driver check
    
    In some environments the can_talk_to_docker key is missing from the
    result of docker_host_info when the call succeeds. Assume we can talk to
    Docker if this key is not present, instead of failing due to a missing
    attribute error.
    
    Change-Id: I7670410394b0bb5fc96e4166b6a20714f847250b

diff --git a/ansible/docker-devicemapper.yml b/ansible/docker-devicemapper.yml
index ce0e012..70ead14 100644
--- a/ansible/docker-devicemapper.yml
+++ b/ansible/docker-devicemapper.yml
@@ -30,12 +30,12 @@
           check_mode: True
           register: devicemapper_docker
           when: docker_config_file.stat.exists
-        when: not docker.can_talk_to_docker
+        when: not (docker.can_talk_to_docker | default(true))
 
       - name: Fail if devicemapper is in use while another storage driver was requested
         fail:
           msg: "Docker storage driver {{ docker_storage_driver }} was requested, but devicemapper is in use"
-        when: (docker.can_talk_to_docker and docker.host_info.Driver == 'devicemapper') or (devicemapper_docker.found | default(0) == 1)
+        when: (docker.can_talk_to_docker | default(true) and docker.host_info.Driver == 'devicemapper') or (devicemapper_docker.found | default(0) == 1)
       when: docker_storage_driver != 'devicemapper'
 
     - name: Ensure Docker devicemapper storage is configured