$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-incoming-9412-28151/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-incoming-9412-28151/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin e5d7c80d28705fffe431a8a5bd6ca477782c7a8c:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         e5d7c80d28705fffe431a8a5bd6ca477782c7a8c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e5d7c80 Release 3.2.12-10.2