$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-incoming-11596-29890/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-incoming-11596-29890/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin c60366cd6776b61626d002f34492e3189fdc06c1:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         c60366cd6776b61626d002f34492e3189fdc06c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c60366c Release 3.2.12-17.5