[Nix-dev] fixing ghc-pkg update

[roconnor at theorem.ca]

Nixers interested cabal might be intersting in following this bug I posted 
to GHC trac:

http://hackage.haskell.org/trac/ghc/ticket/4884

basically

    ghc-pkg --package-conf=myPkg1 --package-conf=myPkg2 --package-conf=myPkg3 --global --user update newPkg.conf

doesn't work properly.  This is especially problematic for Nixers since 
this is the usual behavour for the wrapper of ghc-pkg.  And ghc-pkg update 
is called by runhaskell Setup.hs install.  So basically the cabal 
installer (not to be confused with cabal-install) is useless in Nix at the 
moment.

Why would you want to use the installer for cabal as opposed to hack-nix? 
I don't know the answer to that, but we should strive to make cabal work 
none the less. ;)

-- 
Russell O'Connor                                      <http://r6.ca/>
``All talk about `theft,''' the general counsel of the American Graphophone
Company wrote, ``is the merest claptrap, for there exists no property in
ideas musical, literary or artistic, except as defined by statute.''