Rudder

1) After adding new repository, apt update is not executed, rather directive relays on global parameter "updates_cache_expire". Expected behaviour is to update the apt repository after adding new source, so the package can be installed.

2) Directive may corrupt apt, as It doesn't check if the desired repository already exists on the machine. If it does exist, it will create a .list file with the same content that will cause apt to output warnings.