1. I'm calling it through the host_service, something like:

host_service = connection.system_service().hosts_service().host_service(host.id)

is_upgrade = host_service.upgrade_check()

To my surprise, is_upgrade is None. I expected a Boolean.

2. In addition, when trying to upgrade via:

host_service.upgrade()

I'm getting Operation Failed - and it complains there are no upgrades available.

Alas, in the UI it shows that upgrades available and upgrade does work through the UI.

Am I misusing the functions?

(The host is a regular host, not ovirt-node btw).

TIA,

Y.