$ git clone -n https://src.fedoraproject.org/rpms/kf6.git /var/lib/mock/f40-build-786885-134632/root/chroot_tmpdir/scmroot/kf6
Cloning into '/var/lib/mock/f40-build-786885-134632/root/chroot_tmpdir/scmroot/kf6'...
$ git fetch origin 3bdae3f82cc0c0a3c34926cdcfbe459af6d9478d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6
 * [new ref]         3bdae3f82cc0c0a3c34926cdcfbe459af6d9478d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3bdae3f 6.0.0