$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-v-qcow2-9440-28182/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-v-qcow2-9440-28182/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin 3d6b64312bf0c2f74648e92b6b441813497c42dc:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         3d6b64312bf0c2f74648e92b6b441813497c42dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3d6b643 Release 3.2.12-10.2.0.qcow2.2