$ git clone -n https://github.com/xcp-ng-rpms/xapi /var/lib/mock/v8.3-u-psafont1-10274-28850/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-psafont1-10274-28850/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin fcb22cd2f933c6029a7f0013b60169ecf6101ed2:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         fcb22cd2f933c6029a7f0013b60169ecf6101ed2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fcb22cd bump release for test build