$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-psafont2-10945-29411/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-psafont2-10945-29411/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 3246ab637e131e5dae39231f017a19ce4e815116:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         3246ab637e131e5dae39231f017a19ce4e815116 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3246ab6 bump release for test build