$ git clone -n https://src.fedoraproject.org/rpms/rust-tower.git /var/lib/mock/f39-build-1543650-36573/root/chroot_tmpdir/scmroot/rust-tower
Cloning into '/var/lib/mock/f39-build-1543650-36573/root/chroot_tmpdir/scmroot/rust-tower'...
$ git fetch origin 4c8ee1661ecdf4904abb24a96a3c61f1392a2ebe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tower
 * [new ref]         4c8ee1661ecdf4904abb24a96a3c61f1392a2ebe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4c8ee16 Initial import (#2214392)