$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-11622-29913/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-11622-29913/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin e96ca2706c3beda250d95951ca96ddc27532b6dc:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         e96ca2706c3beda250d95951ca96ddc27532b6dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e96ca27 bump release for test build