$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-10083-28705/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-10083-28705/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 582ed79b1e259d8138cbd4f8c089532c809264b9:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         582ed79b1e259d8138cbd4f8c089532c809264b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 582ed79 bump release for test build