[rb-general] Bug#872263: linux-image-4.11.0-1-amd64-dbg: file overwrite error upgrading from stretch-backports

[Ben Hutchings]

On Wed, 2017-08-16 at 17:51 +0000, Daniel Shahaf wrote:
> Chris Lamb wrote on Wed, 16 Aug 2017 07:54 -0700:
> > > Still, it seems like there is a wider problem here: if the exact same
> > > code is ever built in two unrelated packages then their debug info
> > > packages will conflict even if the regular binary packages don't.
> > 
> > I've seen this outside of reproducibility where I was shipping the exact
> > same binary in the redis-server and redis-sentinel packages (it changes
> > behaviour based on argv[0]).
> > 
> > The -dbgsym packages then conflicted for the same reason.
> 
> Stupid question, but why _do_ the packages conflict?  Couldn't the
> package manager notice that the file versions that would be installed by
> each package are equivalent [= same name, chmod, and bit-by-bit
> contents], and keep the file existing so long as _either_ package is
> installed?

In the case of the kernel packages, the identical binaries (vDSOs) are
emebedded in kernel images with different filenames.  The identical
debug info is installed with different filenames.  But the symlinks to
them underneath /usr/lib/debug/.build-id therefore have the same (hash-
based) name and *different* content.

Ben.

-- 
Ben Hutchings
The generation of random numbers is too important to be left to chance.
                                                       - Robert Coveyou

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