On 1 June 2010 18:52, Duncan Coutts <[email protected]> wrote: > On Tue, 2010-06-01 at 16:48 +0200, Peter Robinson wrote: >> On 31 May 2010 15:18, Duncan Coutts <[email protected]> wrote: >> > Mon May 31 06:03:06 PDT 2010 Duncan Coutts <[email protected]> >> > * 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.
Yes, I guess tracking programs will be necessary, although this might not be as urgent as the dep resolver problems. I suppose this is also highly related to the uninstall feature. > 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. You're probably right. For the time being, however, I would settle for getting the simple file format to work without problems. :) > 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. Hmm, yes I've noticed running into problems once the world file reaches >10 lines. At the moment I don't really see how to make the current resolver algorithm handle this issue, but I'll need to take a closer look at the code. Peter _______________________________________________ cabal-devel mailing list [email protected] http://www.haskell.org/mailman/listinfo/cabal-devel
