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Bug#523801: marked as done (Returns invalid Version objects on packages without candidate versions)

Your message dated Sun, 12 Apr 2009 18:17:10 +0000
with message-id <E1Lt4Ew-0004hG-Fi@ries.debian.org>
and subject line Bug#523801: fixed in python-apt 0.7.10.3
has caused the Debian Bug report #523801,
regarding Returns invalid Version objects on packages without candidate versions
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
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
523801: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=523801
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: python-apt
Version: 0.7.10.1
Severity: critical

Hello,

I'm setting the severity to 'critical' because it causes several other
packages to break, including goplay, ept-cache and basically anything
that uses or recommends apt-xapian-index (see #521346, #523737 and
#523747).

I'm attaching a short test case.  When run on a system which contains a
package in status 'config-files' and with no information in the apt
database, package.candidate gives a version object that throws on every
single method.  

I assume that this is a bug: in a normal API, I would expect to get None
when asking for a candidate version: in fact, there is None.

 # dpkg -s bist
 Package: bist
 Status: deinstall ok config-files
 Priority: optional
 Section: science
 Installed-Size: 2664
 Maintainer: David Paleino <d.paleino@gmail.com>
 [...]

 $ ./testcase.py
 Looking for the situation that annoys Enrico...
 Enrico is annoyed by the behaviour of python-apt on bist
 Traceback (most recent call last):
   File "./testcase2.py", line 16, in <module>
     dummy = ver.raw_description
   File "/usr/lib/python2.5/site-packages/apt/package.py", line 257, in raw_description
     return self._records.LongDesc
   File "/usr/lib/python2.5/site-packages/apt/package.py", line 214, in _records
     if self.package._pcache._records.Lookup(self._cand.FileList[0]):
 AttributeError: 'NoneType' object has no attribute 'FileList'


I would rather not have to work around this by wrapping every read of a
property of Version in try/except, and I wish you can fix this soon,
because I'm getting several nasty bug reports.

If you cannot/won't fix it soon, at least let me know.  Please don't
leave me hanging with a nonfunctional package and no answer for a month
like you did with #513315.


Best of all,

Enrico

-- System Information:
Debian Release: squeeze/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.26-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/bash

Versions of packages python-apt depends on:
ii  apt [libapt-pkg-libc6.7-6-4.6 0.7.20.2   Advanced front-end for dpkg
ii  apt-utils [libapt-inst-libc6. 0.7.20.2   APT utility programs
ii  libc6                         2.9-7      GNU C Library: Shared libraries
ii  libgcc1                       1:4.3.3-5  GCC support library
ii  libjs-jquery                  1.3.2-2    JavaScript library for dynamic web
ii  libstdc++6                    4.3.3-5    The GNU Standard C++ Library v3
ii  lsb-release                   3.2-22     Linux Standard Base version report
ii  python                        2.5.4-2    An interactive high-level object-o
ii  python-central                0.6.11     register and build utility for Pyt

Versions of packages python-apt recommends:
pn  iso-codes                     <none>     (no description available)

Versions of packages python-apt suggests:
pn  python-apt-dbg                <none>     (no description available)
pn  python-gtk2                   <none>     (no description available)
pn  python-vte                    <none>     (no description available)

-- no debconf information

#!/usr/bin/python
# Try to reproduce the python-apt problem behind #523737, #523747 and #521346

import apt, sys

print "Looking for the situation that annoys Enrico..."
cache = apt.Cache(memonly=True)
for pkg in cache:
    ver = pkg.candidate
    if ver is None:
        print >>sys.stderr, name, "has no candidate version"
        sys.exit(0)

    # python-apt should not raise an exception at this point
    try:
        dummy = ver.raw_description
    except:
        print "Enrico is annoyed by the behaviour of python-apt on", pkg.name
        raise

print "You don't have any packages that cause python-apt to annoy Enrico"

--- End Message ---
--- Begin Message --- 
Source: python-apt
Source-Version: 0.7.10.3

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

python-apt-dbg_0.7.10.3_amd64.deb
  to pool/main/p/python-apt/python-apt-dbg_0.7.10.3_amd64.deb
python-apt_0.7.10.3.dsc
  to pool/main/p/python-apt/python-apt_0.7.10.3.dsc
python-apt_0.7.10.3.tar.gz
  to pool/main/p/python-apt/python-apt_0.7.10.3.tar.gz
python-apt_0.7.10.3_amd64.deb
  to pool/main/p/python-apt/python-apt_0.7.10.3_amd64.deb



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 523801@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Julian Andres Klode <jak@debian.org> (supplier of updated python-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: Sun, 12 Apr 2009 19:50:26 +0200
Source: python-apt
Binary: python-apt python-apt-dbg
Architecture: source amd64
Version: 0.7.10.3
Distribution: unstable
Urgency: low
Maintainer: APT Development Team <deity@lists.debian.org>
Changed-By: Julian Andres Klode <jak@debian.org>
Description: 
 python-apt - Python interface to libapt-pkg
 python-apt-dbg - Python interface to libapt-pkg (debug extension)
Closes: 523801
Changes: 
 python-apt (0.7.10.3) unstable; urgency=low
 .
   * apt/package.py: Handle cases where no candidate is available, by returning
     None in the candidate property. (Closes: #523801)
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 eada05adb1fc6ea24dd273bcc085ef17272d4144 397790 python-apt_0.7.10.3_amd64.deb
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Files: 
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--- End Message ---
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