The new implementation of include_runfiles for pkg_tar performs path remapping only on the binaries, and then roots the runfiles in <remapped_binary_path>.runfiles. The runfiles themselves are not remapped, so placing them in a different location is not possible.

My use case for this is placing C++ .so dependencies in a different path (/lib) This would be easy to achieve if remapping applied to runfiles.

My proposed change would be applying remapping to individual runfiles, instead of to the root folder only. I have it working in main...dieortin:rules_pkg:tar-runfile-mapping and would be happy to work on a PR if you think this makes sense.