$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-psafont2-9105-27942/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-psafont2-9105-27942/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 89ce36bc7565db0e53c1aec329b20329a8ee30a2:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         89ce36bc7565db0e53c1aec329b20329a8ee30a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 89ce36b bump release for test build