$ git clone -n https://github.com/xcp-ng-rpms/xapi /var/lib/mock/v8.3-u-psafont1-10493-29050/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-psafont1-10493-29050/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 165129dab9b02347a616cd80ad54f5eef2ecbed6:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         165129dab9b02347a616cd80ad54f5eef2ecbed6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 165129d bump release for test build