$ git clone -n https://src.fedoraproject.org/rpms/rubygem-track_open_instances.git /var/lib/mock/f45-build-35415-695/root/chroot_tmpdir/scmroot/rubygem-track_open_instances
Cloning into '/var/lib/mock/f45-build-35415-695/root/chroot_tmpdir/scmroot/rubygem-track_open_instances'...
$ git fetch origin 4b80c392574485ef757b39f81bdbecebb71e4647:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-track_open_instances
 * [new ref]         4b80c392574485ef757b39f81bdbecebb71e4647 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b80c39 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild