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Re: [PATCH] Uninstall .dll last, reinstall first - final version
On Tue, 3 May 2005, Warren Young wrote:
> Igor Pechtchanski wrote:
>
> > Circular dependencies are not bugs.
>
> Well, there are two types of circular dependencies, and they're only a
> problem in one of these instances.
>
> Circular dependencies of packages in operation is not a problem. That
> is, you can say that there is Package A which uses facilities in Package
> B, and vice versa, and this is not a problem. These two packages simply
> have be installed together or uninstalled together to avoid a dependency
> problem.
>
> Circular dependencies during the [un]installation process _is_ a
> problem. This is where we get the old problem of cygwin.dll or bash
> being removed during an upgrade before all the uninstall scripts for
> other packages are run. This requires a different dependency tree than
> required to solve the above problem.
>
> The distinction is this: it can't be said that 'man' requires /bin/sh in
> operation, but its uninstall script does. We shouldn't demand that bash
> be installed along with man, because any of several packages can provide
> /bin/sh. But if bash is the one providing /bin/sh on your system, it has
> to be removed after man during an upgrade where both packages have been
> updated.
I also wrote, in that same message:
> > Besides, installation dependencies aren't quire the same as
> > uninstallation dependencies. I've posted on this topic before...
I understand the need to save bandwidth, but snipping away the relevant
part of the message, and then repeating it in the reply (albeit in some
more detail) isn't a particularly helpful use of the bandwidth either.
Igor
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