This is not a pressing issue, but something to think about for the future.

Every module build generates a new build of module-build-macros. Currently the version is hard-coded to 0.1, and the release varies every time. Because Koji uses $name/$version/$release/ in the build path, this will eventually result in a very large module-build-macros/0.1 directory. While most file systems allow fairly arbitrary directory sizes, there can be performance issues past 10000 or so. Some systems (e.g. a netapp) might have actual limits that we could reach over time.