One of user usecases is, that they list latest builds in tag and they are satitsfied with versions listed there. After that they start build and it fails on missing required nvrs. It means, that kojira didn't finished repo regen before build started. It could be solved easily if user know, that he can use wait-repo command.

Usability could be better if wait-repo is included in build command itself. Some option should provide this waiting possibility. This behaviour shouldn't be default as it is used in very limited set of usecases and could be propagated to fedpkg build command with same options.

koji build --wait-for-repo target source would have same semantics as koji wait-repo --target target && koji build target source, while koji build --wait-for-build nvr target source would be same as koji wait-repo --target target --build nvr && koji build target source