$ git clone -n https://src.fedoraproject.org/rpms/rust-primal-estimate.git /var/lib/mock/f45-build-44000-809/root/chroot_tmpdir/scmroot/rust-primal-estimate
Cloning into '/var/lib/mock/f45-build-44000-809/root/chroot_tmpdir/scmroot/rust-primal-estimate'...
$ git fetch origin 5cedc01327b609afd65c4bea067ffbcf80f61cb6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-primal-estimate
 * [new ref]         5cedc01327b609afd65c4bea067ffbcf80f61cb6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5cedc01 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild