$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-psafont2-10349-28911/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-psafont2-10349-28911/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 3d935a38d84e962866ea1421ee4608ee10a7553f:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         3d935a38d84e962866ea1421ee4608ee10a7553f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3d935a3 bump release for test build