$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9663-28386/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9663-28386/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 4a383b146dea9b0cc5f276d27289be0563164624:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         4a383b146dea9b0cc5f276d27289be0563164624 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4a383b1 bump release for test build