$ git clone -n https://src.fedoraproject.org/rpms/gtk4.git /var/lib/mock/f40-build-2199173-51724/root/chroot_tmpdir/scmroot/gtk4
Cloning into '/var/lib/mock/f40-build-2199173-51724/root/chroot_tmpdir/scmroot/gtk4'...
$ git fetch origin d0b9ccc73eab45e5556407fc3bd40542610bf904:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtk4
 * [new ref]         d0b9ccc73eab45e5556407fc3bd40542610bf904 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d0b9ccc Update to 4.13.4