$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov1-9133-27954/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov1-9133-27954/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 68f4283b93bbad8d49c6569b537759f5586c9f36:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         68f4283b93bbad8d49c6569b537759f5586c9f36 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 68f4283 bump release for test build