$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-u-abourgeois1-10188-28772/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-u-abourgeois1-10188-28772/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin 856cf26180e3167c1cfb184e1120a462769f6eeb:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         856cf26180e3167c1cfb184e1120a462769f6eeb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 856cf26 bump release for test build