$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9154-27976/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9154-27976/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 6aa123f8fb3bf62a7b42274242e4c56e0419b9c5:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         6aa123f8fb3bf62a7b42274242e4c56e0419b9c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6aa123f bump release for test build