$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-incoming-10736-29278/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-incoming-10736-29278/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin 56208a03cbb9575d754978364b97adf53cef66c4:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         56208a03cbb9575d754978364b97adf53cef66c4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 56208a0 Update our patches on 3.2.12-17