$ git clone -n https://src.fedoraproject.org/rpms/rubygem-listen.git /var/lib/mock/f45-build-35032-693/root/chroot_tmpdir/scmroot/rubygem-listen
Cloning into '/var/lib/mock/f45-build-35032-693/root/chroot_tmpdir/scmroot/rubygem-listen'...
$ git fetch origin 9af457b209a62947e0d96a77154b00c1e38603d6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-listen
 * [new ref]         9af457b209a62947e0d96a77154b00c1e38603d6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9af457b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild