$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-pcoval2-10611-29164/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10611-29164/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin fd3219816f9f73cab0d52f2afe7421ffc771a586:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         fd3219816f9f73cab0d52f2afe7421ffc771a586 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fd32198 bump release for test build