$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-incoming-11320-29646/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-incoming-11320-29646/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin 67c07318a92346893b8fb3e793fc35e4be1e7cb4:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         67c07318a92346893b8fb3e793fc35e4be1e7cb4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 67c0731 QCOW2 release on 3.2.12-17.2