$ git clone -n https://github.com/xcp-ng-rpms/openvswitch.git /var/lib/mock/v8.3-incoming-9083-27939/root/chroot_tmpdir/scmroot/openvswitch
Cloning into '/var/lib/mock/v8.3-incoming-9083-27939/root/chroot_tmpdir/scmroot/openvswitch'...
$ git fetch origin 4638def8102cd5fcfbf6f25cd4a972d6db43e0a5:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/openvswitch
 * [new ref]         4638def8102cd5fcfbf6f25cd4a972d6db43e0a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4638def Merge branch 'XS-8.3' into 8.3-XS-1557