$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-11415-29729/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-11415-29729/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin f574944ab148bb2f5d3900cd7a00438793cad473:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         f574944ab148bb2f5d3900cd7a00438793cad473 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f574944 bump release for test build