$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-u-abourgeois1-9584-28334/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-u-abourgeois1-9584-28334/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin 2be25c0cc7ad4daeb3121fae0d9f4ce1a1ef4241:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         2be25c0cc7ad4daeb3121fae0d9f4ce1a1ef4241 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2be25c0 bump release for test build