Logging paths of installed files

I'm trying to write a module that logs all files installed by Cabal to a file. I've looked through parts of the source and conclude that some of the information (the one used to generate prefixes) needed to construct absolute file paths for installed files exists in Distribution.Simple.LocalBuildInfo. Where does the actual copying take place and is there a way to list the files being copied or am I better of trying to list all files in the dist/ dir and prepend the prefixes myself? What code decides how files are laid out in dist/? Cheers, Johan