$ git clone -n https://src.fedoraproject.org/rpms/kf6-prison.git /var/lib/mock/f40-build-2371144-60394/root/chroot_tmpdir/scmroot/kf6-prison
Cloning into '/var/lib/mock/f40-build-2371144-60394/root/chroot_tmpdir/scmroot/kf6-prison'...
$ git fetch origin 48f656435e2fde51e3a4e1aa50b6db809ac9b4c0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-prison
 * [new ref]         48f656435e2fde51e3a4e1aa50b6db809ac9b4c0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 48f6564 5.249.0