$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_expand.git /var/lib/mock/f40-build-774046-127569/root/chroot_tmpdir/scmroot/rust-uu_expand
Cloning into '/var/lib/mock/f40-build-774046-127569/root/chroot_tmpdir/scmroot/rust-uu_expand'...
$ git fetch origin ea28dd33a07b8636c6ef220e628ce758e5e4b2a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_expand
 * [new ref]         ea28dd33a07b8636c6ef220e628ce758e5e4b2a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea28dd3 Initial package (rhbz#2257522)