Bug#863193: python-apt: Package.fullname and Package.architecture() is wrong for packages with 'all' architecture.

[Michael Schaller <misch@google.com>]

Package: python-apt
Version: 1.4.0~beta3
Severity: normal

Dear Maintainer,

apt.package.Package's fullname property and architecture method return the wrong architecture for packages with the 'all' architecture. A good example is the 'bash-completion' package:

$ dpkg -l bash-completion
...
ii  bash-completion         1:2.1-4.3        all              programmable completion for the bash shell


$ python
...
>>> cache = apt.Cache()
>>> pkg = cache['bash-completion']
>>> pkg.fullname
'bash-completion:amd64'
>>> pkg.architecture()
'amd64'
>>> pkg._pkg.architecture
'amd64'
>>> pkg.versions
<VersionList: ['1:2.1-4.3']>
>>> pkg.installed.architecture
'all'
>>> pkg.candidate.architecture
'all'


I'm not sure if this is even an issue with python-apt but rather an issue with libapt-pkg.
I'm also not sure what Package.architecture() should report in case the architecture of the installed and candidate package version differ, probably the installed architecture.
Last but not least here is a small test script:

#!/usr/bin/python3

import apt

cache = apt.cache.Cache()
for pkg in cache:
  pkg_arch = pkg.architecture()
  if pkg.installed:
    inst_arch = pkg.installed.architecture
    if pkg_arch != inst_arch:
      print("%s: pkg.architecture() != pkg.installed.architecture: %s != %s" % (pkg.name, pkg_arch, inst_arch))
  if pkg.candidate:
    cand_arch = pkg.candidate.architecture
    if pkg_arch != cand_arch:
      print("%s: pkg.architecture() != pkg.candidate.architecture: %s != %s" % (pkg.name, pkg_arch, cand_arch))


Best,

Michael Schaller


-- System Information:
Debian Release: 9.0
Architecture: amd64
 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.9.0-3-amd64 (SMP w/12 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Init: systemd (via /run/systemd/system)

Versions of packages python-apt depends on:
ii  dirmngr            2.1.18-6
ii  gnupg              2.1.18-6
ii  libapt-inst2.0     1.4.1
ii  libapt-pkg5.0      1.4.1
ii  libc6              2.24-10
ii  libgcc1            1:6.3.0-18
ii  libstdc++6         6.3.0-18
ii  python             2.7.13-2
ii  python-apt-common  1.4.0~beta3
pn  python:any         <none>

Versions of packages python-apt recommends:
ii  iso-codes    3.75-1
ii  lsb-release  9.20161125
ii  xz-utils     5.2.2-1.2+b1

Versions of packages python-apt suggests:
ii  apt             1.4.1
pn  python-apt-dbg  <none>
pn  python-apt-doc  <none>

-- no debconf information