$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-psafont2-9103-27940/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-psafont2-9103-27940/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin a7d3ac1181542585dfba4c2f567e0afd93f150c7:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         a7d3ac1181542585dfba4c2f567e0afd93f150c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a7d3ac1 bump release for test build