$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-abourgeois1-10238-28812/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-abourgeois1-10238-28812/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin b93eef8c236810931fda58f21de045cf0b977664:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         b93eef8c236810931fda58f21de045cf0b977664 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b93eef8 bump release for test build