Description of problem: If the backend hasn't been launched, you see this error: $ guestfish -a /dev/null list-filesystems libguestfs: error: list_devices: call launch before using this function (in guestfish, don't forget to use the 'run' command) Version-Release number of selected component (if applicable): 1.17.3 How reproducible: 100% Expected results: We should check that the appliance is up, and if not issue a clearer error.
Closing this, as I don't think it's a serious problem. We've also decided upstream to have a policy of not rewriting error messages.