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Bug#688863: marked as done (non-uniform treatment of self-conflicts for real/virtual "M-A: same" packages)

Your message dated Tue, 16 Oct 2012 16:32:34 +0000
with message-id <E1TOA4I-0006HO-6C@franck.debian.org>
and subject line Bug#688863: fixed in apt 0.9.7.6
has caused the Debian Bug report #688863,
regarding non-uniform treatment of self-conflicts for real/virtual "M-A: same" packages
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
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-- 
688863: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=688863
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: apt
Severity: important

[ Re-posting this as APT bug report, to keep track of it. The original
  version is at https://lists.debian.org/deity/2012/09/msg00088.html ,
  the thread with further discussion (and in particular the POV of one
  of the Policy Editors) at
  https://lists.debian.org/deity/2012/09/msg00088.html ]

Executive summary: it seems that APT treats differently self-conflicts
for "Multi-Arch: same" packages, depending on whether the conflicts
happen on "real" or "virtual" package names. Conflicts on virtual
package names are ignored, whereas conflicts on real package names are
not.

Early discussions with -policy people seem to hint at a desired behavior
where "M-A: same" packages should be co-installable across different
architectures, ignoring self-conflicts, no matter if the conflicts
happen via real or virtual package names.

Cheers.

On Thu, Sep 13, 2012 at 04:26:03PM -0700, Russ Allbery wrote:
> > That does sound like a bug.  The intuitive behavior when foo both
> > Provides and Conflicts with bar would be for the Conflicts to only
> > apply to other packages.
> Indeed.  This particular combination of package metadata has a specific
> meaning defined in Policy 7.4:
[…]
>     their own package name, or with a virtual package which they provide
>     (see below): this does not prevent their installation, and allows a
>     package to conflict with others providing a replacement for it. You
>     use this feature when you want the package in question to be the only
>     package providing some feature.
> 
> So you need to specifically recognize the case of Conflicts naming the
> package itself or a virtual package that this package provides, and in
> that case the Conflicts should not be applied to that package for
> installability determination.
> 
> None of this language has, as yet, been updated for multiarch, but I think
> it makes logical sense for a M-A: same package to be coinstallable even if
> it Conflicts with its own package name or a virtual package it Provides,
> by extension from the intention of this construct without multiarch.

[…]

I could use double checking about the correctness of current APT's
behavior. From how Russ put it above, it shouldn't matter whether the
conflict is via a virtual package name or via a real package name:
self-conflicts across architecture boundaries should be ignored for M-A:
same packages.

According to the attached tests (which are courtesy of Pietro Abate), it
seems that APT does ignore self-conflict across arch boundaries when
they are via virtual packages (test 1), but it doesn't ignore them when
they are via real packages (test 2).


Looking on a random "desktop-like" laptop machine with various suites,
we've found ~200 packages which declare self-conflicts on their real
names (probably due to historical package renaming, that have remained
around). None of them is M-A: same, so the above alleged APT issue is
only theoretical at this point. But it might become real with the
increasing popularity of multiarch-ed packages in the Debian archive.


Cheers.
-- 
Stefano Zacchiroli  . . . . . . .  zack@upsilon.cc . . . . o . . . o . o
Maître de conférences . . . . . http://upsilon.cc/zack . . . o . . . o o
Debian Project Leader . . . . . . @zack on identi.ca . . o o o . . . o .
« the first rule of tautology club is the first rule of tautology club »

Packages
========

    Package: a1
    Version: 1
    Architecture: arch1
    Multi-Arch: same
    Provides: ap
    Conflicts: ap

    Package: a1
    Version: 1
    Architecture: arch2
    Multi-Arch: same
    Provides: ap
    Conflicts: ap

    Package: a2
    Version: 1
    Architecture: arch1
    Multi-Arch: same
    Conflicts: a2

    Package: a2
    Version: 1
    Architecture: arch2
    Multi-Arch: same
    Conflicts: a2

    Package: a3
    Version: 1
    Architecture: arch1
    Multi-Arch: same

    Package: a3
    Version: 1
    Architecture: arch2
    Multi-Arch: same


Test 1
======

    $./fakeapt.sh test install a1:arch1 a1:arch2
    [...]
    The following NEW packages will be installed:
      a1 a1:arch2
    0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
    Inst a1 (1 localhost [arch1])
    Inst a1:arch2 (1 localhost [arch2])
    Conf a1 (1 localhost [arch1])
    Conf a1:arch2 (1 localhost [arch2])


Test 2
======

    $./fakeapt.sh test install a2:arch1 a2:arch2 
    Some packages could not be installed. This may mean that you have
    requested an impossible situation or if you are using the unstable
    distribution that some required packages have not yet been created
    or been moved out of Incoming.
    The following information may help to resolve the situation:

    The following packages have unmet dependencies:
     a2 : Conflicts: a2:arch2 but 1 is to be installed
     a2:arch2 : Conflicts: a2 but 1 is to be installed
    E: Unable to correct problems, you have held broken packages.


Test 3
======

    $./fakeapt.sh test install a3:arch1 a3:arch2
    [...]
    The following NEW packages will be installed:
      a3 a3:arch2
    0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
    Inst a3 (1 localhost [arch1])
    Inst a3:arch2 (1 localhost [arch2])
    Conf a3 (1 localhost [arch1])
    Conf a3:arch2 (1 localhost [arch2])

Attachment: fakeapt.sh
Description: Bourne shell script

Attachment: signature.asc
Description: Digital signature


--- End Message ---
--- Begin Message --- 
Source: apt
Source-Version: 0.9.7.6

We believe that the bug you reported is fixed in the latest version of
apt, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 688863@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Michael Vogt <mvo@debian.org> (supplier of updated apt package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Format: 1.8
Date: Tue, 16 Oct 2012 18:08:53 +0200
Source: apt
Binary: apt libapt-pkg4.12 libapt-inst1.5 apt-doc libapt-pkg-dev libapt-pkg-doc apt-utils apt-transport-https
Architecture: source all amd64
Version: 0.9.7.6
Distribution: unstable
Urgency: low
Maintainer: APT Development Team <deity@lists.debian.org>
Changed-By: Michael Vogt <mvo@debian.org>
Description: 
 apt        - commandline package manager
 apt-doc    - documentation for APT
 apt-transport-https - https download transport for APT
 apt-utils  - package managment related utility programs
 libapt-inst1.5 - deb package format runtime library
 libapt-pkg-dev - development files for APT's libapt-pkg and libapt-inst
 libapt-pkg-doc - documentation for APT development
 libapt-pkg4.12 - package managment runtime library
Closes: 688863 689323 689331
Changes: 
 apt (0.9.7.6) unstable; urgency=low
 .
   [ Program translation updates ]
   * Ukrainian (A. Bondarenko)
 .
   [ David Kalnischkies ]
   * apt-pkg/pkgcachegen.cc:
     - ensure that dependencies for packages:none are always generated
     - add 2 missing remap registrations causing a segfault in case
       we use the not remapped iterators after a move of the mmap again
     - write the native architecture as unique string into the cache header
       as it is used for arch:all packages as a map to arch:native.
       Otherwise arch comparisons later will see differences (Closes: #689323)
   * apt-pkg/pkgcache.cc:
     - ignore negative dependencies applying in the same group for M-A:same
       packages on the real package name as self-conflicts (Closes: #688863)
   * cmdline/apt-cache.cc:
     - print versioned dependency relations in (r)depends if the option
       APT::Cache::ShowVersion is true (default: false) as discussed in
       #218995 to help debian-cd fixing #687949. Thanks to Sam Lidder
       for initial patch and Steve McIntyre for nagging and testing!
   * apt-pkg/edsp.cc:
     - include reinstall requests and already installed (= protected) packages
       in the install-request for external resolvers (Closes: #689331)
   * apt-pkg/policy.cc:
     - match pins with(out) an architecture as we do on the commandline
       (partly fixing #687255, b= support has to wait for jessie)
   * apt-pkg/contrib/netrc.cc:
     - remove the 64 char limit for login/password in internal usage
     - remove 256 char line limit by using getline() (POSIX.1-2008)
 .
   [ Colin Watson ]
   * apt-pkg/pkgcachegen.cc:
     - Fix crash if the cache is remapped while writing a Provides version
       (LP: #1066445).
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