> Can you elaborate a bit about the usecase? How would a perfect adduser be > called, and what would the intended result be? Can this be achieved without > pulling in additional dependencies?
My usecase is a tool for testing programs in programming contests (https://github.com/ioi/isolate). It runs the programs in namespace-based sandboxes, for which it needs a range of otherwise unused UIDs and GIDs. To allocate the [UG]IDs, I would like to use the sub[ug]id mechanism. So I created a user in the postinst script, hoping that it gets a range of sub[ug]ids allocated, but it does not happen if it's a system user. The "useradd" tool already has an option for that: --add-subids-for-system. So it would be nice for "adduser --system" to have a similar option, which just gets propagated to useradd. Martin
