$ git clone -n https://src.fedoraproject.org/rpms/plasma-firewall.git /var/lib/mock/f42-bootstrap-3533865-46421/root/chroot_tmpdir/scmroot/plasma-firewall
Cloning into '/var/lib/mock/f42-bootstrap-3533865-46421/root/chroot_tmpdir/scmroot/plasma-firewall'...
$ git fetch origin 5ae1dd32b09f7bd06f2a33bb308415be65043e02:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-firewall
 * [new ref]         5ae1dd32b09f7bd06f2a33bb308415be65043e02 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5ae1dd3 6.3.5