$ git clone -n https://src.fedoraproject.org/rpms/plasma-firewall.git /var/lib/mock/f42-build-side-1-3505165-45989/root/chroot_tmpdir/scmroot/plasma-firewall
Cloning into '/var/lib/mock/f42-build-side-1-3505165-45989/root/chroot_tmpdir/scmroot/plasma-firewall'...
$ git fetch origin 7f00dfc84f41b1ef5a868588c1535b12b15eb93e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-firewall
 * [new ref]         7f00dfc84f41b1ef5a868588c1535b12b15eb93e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7f00dfc 6.3.4