$ git clone -n https://src.fedoraproject.org/rpms/kf6-prison.git /var/lib/mock/f42-build-3436183-45433/root/chroot_tmpdir/scmroot/kf6-prison
Cloning into '/var/lib/mock/f42-build-3436183-45433/root/chroot_tmpdir/scmroot/kf6-prison'...
$ git fetch origin 7c07fbfa252e58bda5f2161beef5f721ffa6de68:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-prison
 * [new ref]         7c07fbfa252e58bda5f2161beef5f721ffa6de68 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7c07fbf 6.12.0