[Haskell-cafe] Re: circular dependencies in cabal

Valentyn Kamyshenko kamysh at kamysh.org
Mon Feb 2 22:16:59 EST 2009

Hi Duncan,

The major problem that I see is with
  # cabal update
  # cabal upgrade
sequence of operations (that is, upgrading all installed packages).
I use this regularly to keep packages that I use (or are going to use)  
up to date.
This is the functionality that, I suppose, everybody expects from the  
system like hackage/cabal.

And, so far as I can see, the major problem is that 'cabal upgrade'  
will happily upgrade packages, that the core package depends on, and  
eventually will create configuration with circular dependencies.
Can we do something simple - like, for example, forbidding updates of  
the packages that the core depends on (directly and indirectly)?

-- Valentyn.

On Feb 2, 2009, at 5:34 PM, Duncan Coutts wrote:

> On Tue, 2009-02-03 at 02:11 +0100, Achim Schneider wrote:
>> Duncan Coutts <duncan.coutts at worc.ox.ac.uk> wrote:
>>> That is probably how people are getting into this mess. Using  
>>> upgrade
>>> is not necessarily such a good idea. It does not distinguish between
>>> the interesting packages you might want to upgrade and the core
>>> packages that your probably do not want to touch.
>> There's no need to use cabal upgrade to get into this kind of mess, I
>> successfully pulled conflicting cabal versions just by using cabal
>> install.
> Indeed, it's just easier to shoot yourself in the foot using upgrade.
> Would anyone object if I disable the upgrade command in the next  
> version
> and not re-enable it until it works?
> Duncan
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