$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-v-qcow2-9484-28218/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-v-qcow2-9484-28218/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin 5bcafd024f1a9d4fd57ed9a4392f2dd81cdb7d60:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         5bcafd024f1a9d4fd57ed9a4392f2dd81cdb7d60 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5bcafd0 Release 3.2.12-10.2.0.qcow2.6