$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-incoming-11490-29795/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-incoming-11490-29795/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin 43ed841973ad7a646ba02cae75015328b9ffeac7:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         43ed841973ad7a646ba02cae75015328b9ffeac7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 43ed841 Merge pull request #90 from xcp-ng-rpms/dtt-rel-8.3-qcow2