$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-v-qcow2-9458-28199/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-v-qcow2-9458-28199/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin 2354010c3da513dc7be3e8f71fb6518e935dc933:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         2354010c3da513dc7be3e8f71fb6518e935dc933 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2354010 Release 3.2.12-10.2.0.qcow2.3