[ovirt-devel] upgrade_check and upgrade API calls (v4)

I'm trying to check if a certain host can be upgraded. 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.