Re: 1st unpacking, 2nd dependency checking

[Santiago Vila <sanvila@unex.es>]

On Sat, 10 Oct 1998, Martin Schulze wrote:

> Santiago Vila wrote:
> > > But occasionally I notices that dpkg first unpacks and installs
> > > the files in a particular package and checks dependencies afterwards.
> > > 
> > > This means that wrong dependencies are discovered when it is
> > > too late since the old version of the package is already
> > > overwritten.
> 
> > The rationale is that this would make package installing too much
> > troublesome, if not impossible in some cases. In particular, if A depends
> > on B and B depends on A, you would be unable to install A and B at all.
> > With the current design, you can.
> 
> This should be resolveable in one dpkg run itself since it should
> be able to know which packages it's going to install.  If both,
> A and B, are to be installed at the same time the issue is resolved.

I don't think so, because dpkg processes the packages sequentially
(and the name of the file is irrelevant).

I would say dpkg does it that way for performance reasons, but I
don't know.

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