$ git clone -n https://github.com/xcp-ng-rpms/xcp-python-libs /var/lib/mock/v8.3-incoming-9030-27901/root/chroot_tmpdir/scmroot/xcp-python-libs
Cloning into '/var/lib/mock/v8.3-incoming-9030-27901/root/chroot_tmpdir/scmroot/xcp-python-libs'...
$ git fetch origin 74bf9e56a5733a03d354bc6e678ea42bcdb1f8f3:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-python-libs
 * [new ref]         74bf9e56a5733a03d354bc6e678ea42bcdb1f8f3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 74bf9e5 Merge branch 'XS-8.3' into XS-1555