$ git clone -n https://src.fedoraproject.org/rpms/gtk4.git /var/lib/mock/f40-build-795288-140106/root/chroot_tmpdir/scmroot/gtk4
Cloning into '/var/lib/mock/f40-build-795288-140106/root/chroot_tmpdir/scmroot/gtk4'...
$ git fetch origin 4cf34a5eb2719ba9b97703b11340fe0422492912:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtk4
 * [new ref]         4cf34a5eb2719ba9b97703b11340fe0422492912 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4cf34a5 Update to 4.13.9