New-to-Haskell, i.e. elementary, Haskell questions; extended discussions

Derrell Piper | 9 Oct 2012 17:31

problem with cabal-install-1.16.0 and Cabal-1.16.0.1 on Haskell Platform for OS X

Hi,

New Haskell user here.  I have the latest Haskell Platform 2012.2.0.0 for Mac OS X, 64 bit installed.  I have not installed any additional packages.  Believe me, the Prelude hurts enough.  Anyways, seeing the big update to cabal, I decided to install it and did a: 

cabal install cabal-install-1.16.0 Cabal-1.16.0.1

...per the announcement.  The installation seemingly went well (log attached) but I'm left with a symlink farm that's still pointing at the old version.  NB: I did the installation in my own account (ddp), not via sudo which looks like what was probably expected given the ownerships I do see.  Here's what I'm left with:

% which cabal
/usr/bin/cabal
% ls -la /usr/bin/cabal
lrwxr-xr-x  1 root  wheel  - 26 Oct  8 16:42 /usr/bin/cabal -> /Library/Haskell/bin/cabal
% ls -la /Library/Haskell/bin/cabal*
lrwxr-xr-x  1 ddp   wheel  -   10 Oct  8 16:42 /Library/Haskell/bin/cabal -> cabal.wrap
lrwxr-xr-x  1 ddp   wheel  -   37 Oct  8 16:42 /Library/Haskell/bin/cabal.real -> ../lib/cabal-install-0.14.0/bin/cabal
-rwxr-xr-x  1 root  admin  - 4197 May 27 12:37 /Library/Haskell/bin/cabal.wrap

I find that it actually installed itself here:

% ls -la ~/Library/Haskell/bin/cabal*
lrwxr-xr-x  1 ddp  staff  - 47 Oct  8 20:45 /Users/ddp/Library/Haskell/bin/cabal -> ../ghc-7.4.1/lib/cabal-install-1.16.0/bin/cabal

So I guess my questions are:

1) did I miss some step along the way?
2) what's the correct way to fix this?  Just change the cabal.real symlink to point to where it actually is?
3) which, if any, directories should I have in my PATH in general: /Library/Haskell/bin, ~/Library/Haskell/bin, neither or both?

Thanks,

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Johan Tibell | 9 Oct 2012 17:48

Re: problem with cabal-install-1.16.0 and Cabal-1.16.0.1 on Haskell Platform for OS X

Hi,

Thanks for the detailed problem description. I've CCed Mark Lentczner,
who designed the directory layout for the Haskell Platform on OS X.
Hopefully he'll be able to tell you what to do.

On Tue, Oct 9, 2012 at 8:31 AM, Derrell Piper <ddp <at> electric-loft.org> wrote:
> Hi,
>
> New Haskell user here.  I have the latest Haskell Platform 2012.2.0.0 for Mac OS X, 64 bit installed.  I have not installed any additional packages.  Believe me, the Prelude hurts enough.  Anyways, seeing the big update to cabal, I decided to install it and did a:
>
> cabal install cabal-install-1.16.0 Cabal-1.16.0.1
>
> ...per the announcement.  The installation seemingly went well (log attached) but I'm left with a symlink farm that's still pointing at the old version.  NB: I did the installation in my own account (ddp), not via sudo which looks like what was probably expected given the ownerships I do see.  Here's what I'm left with:
>
> % which cabal
> /usr/bin/cabal
> % ls -la /usr/bin/cabal
> lrwxr-xr-x  1 root  wheel  - 26 Oct  8 16:42 /usr/bin/cabal -> /Library/Haskell/bin/cabal
> % ls -la /Library/Haskell/bin/cabal*
> lrwxr-xr-x  1 ddp   wheel  -   10 Oct  8 16:42 /Library/Haskell/bin/cabal -> cabal.wrap
> lrwxr-xr-x  1 ddp   wheel  -   37 Oct  8 16:42 /Library/Haskell/bin/cabal.real -> ../lib/cabal-install-0.14.0/bin/cabal
> -rwxr-xr-x  1 root  admin  - 4197 May 27 12:37 /Library/Haskell/bin/cabal.wrap
>
> I find that it actually installed itself here:
>
> % ls -la ~/Library/Haskell/bin/cabal*
> lrwxr-xr-x  1 ddp  staff  - 47 Oct  8 20:45 /Users/ddp/Library/Haskell/bin/cabal -> ../ghc-7.4.1/lib/cabal-install-1.16.0/bin/cabal
>
> So I guess my questions are:

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