$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9753-28465/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9753-28465/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 0997f71e04e61b12fdbeb8cc2835da9cfa999a7e:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         0997f71e04e61b12fdbeb8cc2835da9cfa999a7e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0997f71 bump release for test build