$ git clone -n https://src.fedoraproject.org/rpms/x2goserver.git /var/lib/mock/f45-build-38581-725/root/chroot_tmpdir/scmroot/x2goserver
Cloning into '/var/lib/mock/f45-build-38581-725/root/chroot_tmpdir/scmroot/x2goserver'...
$ git fetch origin c0cc71a4219c8dcbfcfe001cb2964697335696b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/x2goserver
 * [new ref]         c0cc71a4219c8dcbfcfe001cb2964697335696b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c0cc71a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild