[Haskell-cafe] cabal upgrade

[wman]

On Wed, Oct 1, 2008 at 10:52 PM, Duncan Coutts
<duncan.coutts at worc.ox.ac.uk>wrote:

> > and you have network access, start updating it.
>
> That's hard. Detecting if we would be able to make a network connection
> without actually doing it is not something I know how to do (esp in a
> portable way). We would very much appreciate some help in this area.
>
> Duncan
>

Well, i wouldn't try to detect it. If someone has some auto-update interval
specified, it would be sensible enough to try the update automatically imho.

Or, if the package server would responds to ICMP echo requests (seems like
it doesn't), this seems as a cheap-enough way to test whether it should try
to update.

Or how about http/1.1 if-modified-since header field ?
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