$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-psafont2-9749-28460/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-psafont2-9749-28460/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 15aafdebb34526162a48ea742ec81034724e882e:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         15aafdebb34526162a48ea742ec81034724e882e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 15aafde bump release for test build