$ git clone -n https://github.com/xcp-ng-rpms/xcp-python-libs /var/lib/mock/v8.3-incoming-9969-28628/root/chroot_tmpdir/scmroot/xcp-python-libs
Cloning into '/var/lib/mock/v8.3-incoming-9969-28628/root/chroot_tmpdir/scmroot/xcp-python-libs'...
$ git fetch origin 119d29c8e92dd0e0ae9c65cb4fc2c4932eaf7ef4:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-python-libs
 * [new ref]         119d29c8e92dd0e0ae9c65cb4fc2c4932eaf7ef4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 119d29c Fixup old changelog for diffs