$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9736-28445/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9736-28445/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin db547e0f371d8db1658c1481bb3e9b65afb9ee5c:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         db547e0f371d8db1658c1481bb3e9b65afb9ee5c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db547e0 bump release for test build