Bug#893754: autopkgtest 5.1 "autopkgtest-default-release" breaks tests that exercise apt

[Iain Lane]

Thanks Steve.

On Wed, Mar 21, 2018 at 05:18:53PM -0700, Steve Langasek wrote:
> When autopkgtest 5.2 was recently rolled out to the Ubuntu infrastructure,
> various package-manager-related test suites began to fail as a result of the
> use of APT::Default-Release introduced in 5.1:
> […]

I see autopkgtest already does:

  for default in default_releases:
      script += 'printf "\nPackage: *\\nPin: release a=%(default)s\\nPin-Priority: 990\\n" >> /etc/apt/preferences.d/autopkgtest-%(release)s; ' % \
          {'release': release, 'default': default}

if there are default releases passed to this function, which there are
only for -updates. But AIUI (jak?) this is effectively the same as
APT::Default-Release anyway, so I'm proposing that we always do this for
the default release instead of the apt.conf.d snippet.

Cheers,

-- 
Iain Lane                                  [ iain at orangesquash.org.uk ]
Debian Developer                                   [ laney at debian.org ]
Ubuntu Developer                                   [ laney at ubuntu.com ]
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