$ git clone -n https://src.fedoraproject.org/rpms/plasma-firewall.git /var/lib/mock/f42-build-side-1-3566280-46733/root/chroot_tmpdir/scmroot/plasma-firewall
Cloning into '/var/lib/mock/f42-build-side-1-3566280-46733/root/chroot_tmpdir/scmroot/plasma-firewall'...
$ git fetch origin ab98f2004acc0312a8ca864be6f3b18a30d96298:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-firewall
 * [new ref]         ab98f2004acc0312a8ca864be6f3b18a30d96298 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ab98f20 6.4.0