set env variable to let pre/post install knows whether we're doing an install or upgrade
set env variable to let pre/post install knows whether we're doing an install or upgrade



tpkg/pkgs,tpkg/client,tpkg/client,tpkg/pkgs,tpkg/server,tpkg/pkgs,tpkg/server,jaeheung90/tpkg-client,jaeheung90/tpkg-client,tpkg/client,tpkg/server,jaeheung90/tpkg-client