Re: patch applied (cabal-install): Disable cabal upgrade and add cabal install --upgrade-dependencies

On Tue, 2010-06-01 at 16:48 +0200, Peter Robinson wrote:

On 31 May 2010 15:18, Duncan Coutts wrote:

...

Mon May 31 06:03:06 PDT 2010 Duncan Coutts * Disable cabal upgrade and add cabal install --upgrade-dependencies cabal upgrade now gives an error message telling people to use install or, if they know what they're doing, install --upgrade-dependencies

How about also adding a reference to 'cabal install world'? I think that's the behaviour most people actually want when running upgrade (at least I do :) ).

Yes, I was thinking about that. I think we need a little more work before the world feature is recommended to the masses. http://hackage.haskell.org/trac/hackage/ticket/695 As you point out, we would really need to start tracking programs. The other thing I'm not yet convinced about is keeping just the flags in the world file. I suspect we'll need more eventually and should perhaps plan the format with that in mind. Also currently we do not properly assign flags to individual packages, that's not the fault of the world feature, it's a problem elsewhere in cabal-install. Don't get me wrong, the world feature is definitely what we need (and works well for distros) but generally I think we need more experience of how it works in practise. I suspect one of the first things we'll find is that the dep resolver runs into problems when trying to install world. While it could find install plans for each package individually it might not be able to find a plan for all the world packages simultaneously. We may need some significant improvements in the solver and we might have to do things like treating the flags etc as suggestions rather than hard "all or nothing" constraints. Duncan