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import os


def openstack_argument_spec():
    # Consume standard OpenStack environment variables.
    # This is mainly only useful for ad-hoc command line operation as
    # in playbooks one would assume variables would be used appropriately
    OS_AUTH_URL=os.environ.get('OS_AUTH_URL', 'http://127.0.0.1:35357/v2.0/')
    OS_PASSWORD=os.environ.get('OS_PASSWORD', None)
    OS_REGION_NAME=os.environ.get('OS_REGION_NAME', None)
    OS_USERNAME=os.environ.get('OS_USERNAME', 'admin')
    OS_TENANT_NAME=os.environ.get('OS_TENANT_NAME', OS_USERNAME)

    spec = dict(
        login_username                  = dict(default=OS_USERNAME),
        auth_url                        = dict(default=OS_AUTH_URL),
        region_name                     = dict(default=OS_REGION_NAME),
        availability_zone               = dict(default=None),
    )
    if OS_PASSWORD:
        spec['login_password'] = dict(default=OS_PASSWORD)
    else:
        spec['login_password'] = dict(required=True)
    if OS_TENANT_NAME:
        spec['login_tenant_name'] = dict(default=OS_TENANT_NAME)
    else:
        spec['login_tenant_name'] = dict(required=True)
    return spec

def openstack_find_nova_addresses(addresses, ext_tag, key_name=None):

    ret = []
    for (k, v) in addresses.iteritems():
        if key_name and k == key_name:
            ret.extend([addrs['addr'] for addrs in v])
        else:
            for interface_spec in v:
                if 'OS-EXT-IPS:type' in interface_spec and interface_spec['OS-EXT-IPS:type'] == ext_tag:
                    ret.append(interface_spec['addr'])
    return ret

