$ git clone -n https://src.fedoraproject.org/rpms/kde-gtk-config.git /var/lib/mock/f41-build-860453-168945/root/chroot_tmpdir/scmroot/kde-gtk-config
Cloning into '/var/lib/mock/f41-build-860453-168945/root/chroot_tmpdir/scmroot/kde-gtk-config'...
$ git fetch origin b609b20f3bb4890f45b8938595af205a65181b95:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kde-gtk-config
 * [new ref]         b609b20f3bb4890f45b8938595af205a65181b95 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b609b20 6.2.2