gluon/package/gluon-core/luasrc/lib/gluon/upgrade/001-upgrade

#!/usr/bin/lua

local fs = require 'nixio.fs'
local sysconfig = require 'gluon.sysconfig'


if fs.stat('/lib/gluon/version/core') and not sysconfig.gluon_version then
  -- This isn't an initial upgrade, so set gluon_version
  sysconfig.gluon_version = ''
end