$ git clone -n https://src.fedoraproject.org/rpms/rubygem-delorean.git /var/lib/mock/f45-build-34888-692/root/chroot_tmpdir/scmroot/rubygem-delorean
Cloning into '/var/lib/mock/f45-build-34888-692/root/chroot_tmpdir/scmroot/rubygem-delorean'...
$ git fetch origin 973a9939559429c3e1e77a781313ccfb80f489db:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-delorean
 * [new ref]         973a9939559429c3e1e77a781313ccfb80f489db -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 973a993 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild