$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_mkdir.git /var/lib/mock/f41-build-810486-146724/root/chroot_tmpdir/scmroot/rust-uu_mkdir
Cloning into '/var/lib/mock/f41-build-810486-146724/root/chroot_tmpdir/scmroot/rust-uu_mkdir'...
$ git fetch origin b5c57e392344557e9cffb81afe4bb7f69027ab16:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_mkdir
 * [new ref]         b5c57e392344557e9cffb81afe4bb7f69027ab16 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5c57e3 Rebuild with Rust 1.78 to fix incomplete debuginfo and backtraces