$ git clone -n https://src.fedoraproject.org/rpms/rust-rd-util.git /var/lib/mock/f39-build-2087789-50159/root/chroot_tmpdir/scmroot/rust-rd-util
Cloning into '/var/lib/mock/f39-build-2087789-50159/root/chroot_tmpdir/scmroot/rust-rd-util'...
$ git fetch origin 40d1785c0f17e34b9b5b642c4726e7103c42f637:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rd-util
 * [new ref]         40d1785c0f17e34b9b5b642c4726e7103c42f637 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 40d1785 Bump page_size dependency from 0.4 to 0.6