$ git clone -n https://src.fedoraproject.org/rpms/rubygem-domain_name.git /var/lib/mock/f45-build-34911-692/root/chroot_tmpdir/scmroot/rubygem-domain_name
Cloning into '/var/lib/mock/f45-build-34911-692/root/chroot_tmpdir/scmroot/rubygem-domain_name'...
$ git fetch origin 6429f15af7e9245b12328456c6233d6e19d30e37:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-domain_name
 * [new ref]         6429f15af7e9245b12328456c6233d6e19d30e37 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6429f15 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild