$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-psafont2-9588-28336/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-psafont2-9588-28336/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 55d7dd9e5f0aca79522a1ff414cb916c3728454a:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         55d7dd9e5f0aca79522a1ff414cb916c3728454a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 55d7dd9 bump release for test build