$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov1-11511-29820/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov1-11511-29820/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 072d7d7de69610261ac51858eafceed8d798ddd1:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         072d7d7de69610261ac51858eafceed8d798ddd1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 072d7d7 bump release for test build