$ git clone -n https://src.fedoraproject.org/rpms/rust-precomputed-hash.git /var/lib/mock/f45-build-43948-809/root/chroot_tmpdir/scmroot/rust-precomputed-hash
Cloning into '/var/lib/mock/f45-build-43948-809/root/chroot_tmpdir/scmroot/rust-precomputed-hash'...
$ git fetch origin 5f4bfb0c0fa19e5a5e3a7a21c4e480ad0bd29e98:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-precomputed-hash
 * [new ref]         5f4bfb0c0fa19e5a5e3a7a21c4e480ad0bd29e98 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f4bfb0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild