$ git clone -n https://src.fedoraproject.org/rpms/kf6-prison.git /var/lib/mock/f42-build-side-1-3533142-46342/root/chroot_tmpdir/scmroot/kf6-prison
Cloning into '/var/lib/mock/f42-build-side-1-3533142-46342/root/chroot_tmpdir/scmroot/kf6-prison'...
$ git fetch origin 925d866667182e389c868b9f17dff45daed1c198:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-prison
 * [new ref]         925d866667182e389c868b9f17dff45daed1c198 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 925d866 6.14.0