[Bug 1288171] Re: 0.9.3 regression: Setting APT::Architecture now downloads wrong indexes

[Julian Andres Klode]

The same tests ran successfully during the build, and there is no reason
they should fail in autopkgtest. Especially not on files that were
specifically excluded from the pyflakes test. I don't know what's
happening there.

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Title:
  0.9.3 regression: Setting APT::Architecture now downloads wrong
  indexes

Status in “python-apt” package in Ubuntu:
  Fix Committed
Status in “python-apt” source package in Trusty:
  Fix Committed
Status in “python-apt” package in Debian:
  Fix Released

Bug description:
  trusty-proposed now got python-apt 0.9.3.1 which, compared to trusty's
  0.9.1ubuntu1 regresses the support for using "sandboxes" with a
  different architecture, with e. g.

    apt.apt_pkg.config.set('APT::Architecture', 'armhf')

  This can be seen in apport's autopkgtest, which now fails the
  backend_apt_dpkg.test_install_packages_armhf test
  (https://jenkins.qa.ubuntu.com/job/trusty-adt-
  apport/144/ARCH=i386,label=adt/consoleText):

  ======================================================================
  ERROR: test_install_packages_armhf (__main__.T)
  install_packages() for foreign architecture armhf
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/apt/cache.py", line 441, in update
      pulse_interval)
  SystemError: W:GPG error: http://ddebs.ubuntu.com precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ECDCAD72428D7C01, W:Failed to fetch http://ports.ubuntu.com/dists/precise/main/binary-i386/Packages  404  Not Found [IP: 91.189.88.140 80]
  , E:Some index files failed to download. They have been ignored, or old ones used instead.

  Note that it now tries to download "binary-i386/", not "binary-armhf/"
  as configured.

  Direct reproducer:

  apt-get source apport
  cd apport-*
  cp backends/packaging-apt-dpkg.py apport/packaging_impl.py
  test/run backend_apt_dpkg.test_install_packages_armhf

  I'll try to come up with a standalone reproducer.

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