Add support for mounting host volumes with Z and z options

lib/ansible/modules/cloud/docker/docker.py

@@ -81,8 +81,7 @@ options:
   volumes:
     description:
       - List of volumes to mount within the container using docker CLI-style
-      - 'syntax: C(/host:/container[:mode]) where "mode" may be "rw" or "ro".'
-    required: false
+      - 'syntax: C(/host:/container[:mode]) where "mode" may be "rw", "ro", "Z", "z".'
     default: null
   volumes_from:
     description:
@@ -638,14 +637,14 @@ class DockerManager(object):
                 # host mount (e.g. /mnt:/tmp, bind mounts host's /tmp to /mnt in the container)
                 elif 2 <= len(parts) <= 3:
                     # default to read-write
-                    ro = False
+                    mode = 'rw'
                     # with supplied bind mode
                     if len(parts) == 3:
-                        if parts[2] not in ['ro', 'rw']:
-                            self.module.fail_json(msg='bind mode needs to either be "ro" or "rw"')
+                        if parts[2] not in ['ro', 'rw', 'z', 'Z']:
+                            self.module.fail_json(msg='bind mode needs to be one of "ro", "rw", "z", or "Z"')
                         else:
-                            ro = parts[2] == 'ro'
-                    self.binds[parts[0]] = {'bind': parts[1], 'ro': ro }
+                            mode = parts[2]
+                    self.binds[parts[0]] = {'bind': parts[1], 'mode': mode }
                 else:
                     self.module.fail_json(msg='volumes support 1 to 3 arguments')
 
@@ -1225,10 +1224,7 @@ class DockerManager(object):
                 for host_path, config in self.binds.iteritems():
                     if isinstance(config, dict):
                         container_path = config['bind']
-                        if config['ro']:
-                            mode = 'ro'
-                        else:
-                            mode = 'rw'
+                        mode = config['mode']
                     else:
                         container_path = config
                         mode = 'rw'