$ git clone -n https://src.fedoraproject.org/rpms/kalk.git /var/lib/mock/f40-build-2111416-50662/root/chroot_tmpdir/scmroot/kalk
Cloning into '/var/lib/mock/f40-build-2111416-50662/root/chroot_tmpdir/scmroot/kalk'...
$ git fetch origin 831da015213ce0c747a540115e830ad2653eba3e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kalk
 * [new ref]         831da015213ce0c747a540115e830ad2653eba3e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 831da01 24.01.80