$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v9.0-u-ydi1-11566-29870/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v9.0-u-ydi1-11566-29870/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 46bde34cab75290524006699fe63d6424c3c2cb6:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         46bde34cab75290524006699fe63d6424c3c2cb6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 46bde34 bump release for test build