$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-psafont1-9531-28271/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-psafont1-9531-28271/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin d190fa698a1227c3f8007a16f85348038ad99827:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         d190fa698a1227c3f8007a16f85348038ad99827 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d190fa6 bump release for test build