$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v9.0-u-ydi1-11604-29896/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v9.0-u-ydi1-11604-29896/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin d8a46781c5872854b15e955c1d930f4db70c730a:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         d8a46781c5872854b15e955c1d930f4db70c730a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d8a4678 bump release for test build