$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-11308-29641/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-11308-29641/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 09c9c48d8cd454c6c4f645f46e3d3b8c886e37b2:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         09c9c48d8cd454c6c4f645f46e3d3b8c886e37b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 09c9c48 bump release for test build