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.
minimal standalone reproducer. Note that this always uses /tmp/sandbox/ for easier investigation, and does not clean it up. So you need to rm -r it in between runs.