$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-psafont2-10347-28909/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-psafont2-10347-28909/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 0dadc061499ab4ad8509ec3f3c46b64b2693ff48:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         0dadc061499ab4ad8509ec3f3c46b64b2693ff48 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0dadc06 bump release for test build