$ git clone -n https://github.com/xcp-ng-rpms/host-upgrade-plugin.git /var/lib/mock/v8.3-incoming-9038-27920/root/chroot_tmpdir/scmroot/host-upgrade-plugin
Cloning into '/var/lib/mock/v8.3-incoming-9038-27920/root/chroot_tmpdir/scmroot/host-upgrade-plugin'...
$ git fetch origin 7a2066982cbd326fedccf1a6a4aeeb24540eb964:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/host-upgrade-plugin
 * [new ref]         7a2066982cbd326fedccf1a6a4aeeb24540eb964 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7a20669 Merge branch 'XS-8.3' into XS-1641