$ git clone -n https://src.fedoraproject.org/rpms/rubygem-xpath.git /var/lib/mock/f45-build-35449-695/root/chroot_tmpdir/scmroot/rubygem-xpath
Cloning into '/var/lib/mock/f45-build-35449-695/root/chroot_tmpdir/scmroot/rubygem-xpath'...
$ git fetch origin d0345af955ca1e2d52128f48abd70f7bdea3fc97:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-xpath
 * [new ref]         d0345af955ca1e2d52128f48abd70f7bdea3fc97 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d0345af Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild