$ git clone -n https://src.fedoraproject.org/rpms/rpcsvc-proto.git /var/lib/mock/f45-build-34638-690/root/chroot_tmpdir/scmroot/rpcsvc-proto
Cloning into '/var/lib/mock/f45-build-34638-690/root/chroot_tmpdir/scmroot/rpcsvc-proto'...
$ git fetch origin 02894b2cf3a61a09bfd5ec320b64b79838b76750:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rpcsvc-proto
 * [new ref]         02894b2cf3a61a09bfd5ec320b64b79838b76750 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 02894b2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild