$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-incoming-9052-27920/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-incoming-9052-27920/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin f1206869e4dfaf036e9cd60e87b2ecc95a06212b:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         f1206869e4dfaf036e9cd60e87b2ecc95a06212b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f120686 Release 3.2.12-3.3