[Bug 1238616] Re: creating apt cache with rootdir= still considers global apt config

[Martin Pitt]

Michal and I debugged this over IRC, and tracked it down. He had an
/etc/apt/apt.conf with explicitly setting Architecture:, and creating an
apt.Cache(rootdir="...") object still takes that global configuration
into account.

The attached test script works on a default installation, downloads the
armhf saucy main index, and creates
/tmp/r/var/lib/apt/lists/ports.ubuntu.com_dists_saucy_main_binary-
armhf_Packages.

But Michal has something like this config:

echo 'APT::Architectures:: "amd64";' | sudo tee
/etc/apt/apt.conf.d/01explicit_arch

After doing that, running the test script shows the same failure:

Err http://ports.ubuntu.com saucy/main amd64 Packages                                                                                                        
Get:4 http://ports.ubuntu.com saucy/main armhf Packages [1219 kB]
[...]
E:Some index files failed to download. They have been ignored, or old ones used instead.

So, it might certainly be that I'm using python-apt wrongly here, but I
would certainly expect apt.Cache(rootdir=/path/to/my/sandbox) to not
consider anything from /etc/apt/?

** Attachment added: "test script"
   https://bugs.launchpad.net/ubuntu/+source/python-apt/+bug/1238616/+attachment/3874724/+files/test.py

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https://bugs.launchpad.net/bugs/1238616

Title:
  creating apt cache with rootdir= still considers global apt config

Status in “python-apt” package in Ubuntu:
  New

Bug description:
  I've tried to retrace a unity8 .crash from the phone on my desktop,
  using lp:daisy config, but the retrace process bails out after failing
  to download i386 and amd64 from ports.ubuntu.com. See the attached log
  for details.

  The command I used:

  ⟫ LANG=C apport-retrace -v -S daisy/retracer/config/ -C cache/ -o
  unity8.crash _usr_bin_unity8.32011.crash 2>&1 | tee retrace.log

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