[Pkg-dspam-misc] Bug#695275: handling of shared resources in M-A:same packages of dspam

[Thomas Preud'homme]

Le dimanche 6 janvier 2013 17:09:48, Helmut Grohne a écrit :
> [Adding multiarch-devel to CC for a comment on point 3.]
> 
> On Sun, Jan 06, 2013 at 12:50:35PM +0100, Thomas Preud'homme wrote:
> > Ah yes sorry. I searched explicitely for user locking but of course it's
> > the case for any shared (among arch) resources modified/removed on
> > purge.
> 
> Actually looking at it again I believe that simply removing Multi-Arch
> for wheezy would be the best thing to do. My reasons for that are:
> 
> 1) The release time likes one-line-fixes.

Yep and keeping multiarch would be a much bigger change.

> 2) None of those libraries has external (i.e. outside of src:dspam)
>    reverse dependencies. So the benefit of Multi-Arch is kind of
>    limited.

We were saying this on IRC few minutes ago.

> 3) Handling shared resources in M-A:same packages is yet an unsolved
>    problem. As more packages stumble across this problem there will
>    likely be a helper for such situations. This will not happen for
>    wheezy, so save yourself a bit of time and just defer this issue.

Yeah but I'm not sure a helper would be enough. I was already writing such a 
small helper for myself (see below) but I stumbled upon the problem of 
dbconfig-common in my case. It's used with debconf to install conf files and 
it would be invoked twice if a multiarchified package was installed for 2 
different architectures. I'm sure there is some other such example.

% cat debian/last_arch_installed 
#!/bin/sh

# Multi-arch was added in dpkg in the same version as the db:Status-Abbrev
# virtual field was added to dpkg-query. Hence, either this bug cannot be
# encountered, or db:Status-Abbrev virtual field is available in dpkg-query.
! dpkg --assert-multi-arch ||
        ! dpkg-query '-f=${db:Status-Abbrev}\n' -W $1 | grep -vE '(.n|pc)' 
>/dev/null


> 
> Helmut

Best regards,

Thomas Preud'homme
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