$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov1-9254-28041/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov1-9254-28041/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 33fb3dcb4c6b045e48354ff05ad175a7c7da1665:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         33fb3dcb4c6b045e48354ff05ad175a7c7da1665 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 33fb3dc bump release for test build