modules of cabal-install

Hi, I would like to reuse the module Distribution.Client.Tar from the cabal-install package. Are you willing to split up your package? Is it worth to have single module packages? Currently, Distribution.Client.Tar depends on Distribution.Client.Utils.writeFileAtomic, but this final call could be left to the user. Maybe writeFileAtomic should be in another package, too? Trying to avoid copying source code, Christian