$ git clone -n https://src.fedoraproject.org/rpms/gtk4.git /var/lib/mock/f41-build-836297-158800/root/chroot_tmpdir/scmroot/gtk4
Cloning into '/var/lib/mock/f41-build-836297-158800/root/chroot_tmpdir/scmroot/gtk4'...
$ git fetch origin 9850b534e0aa58c7b25a0e7651a673a25502b0f6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtk4
 * [new ref]         9850b534e0aa58c7b25a0e7651a673a25502b0f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9850b53 Update to 4.15.4