[Bug 1814727] Re: Backport never pinning and Packages-Require-Authorization

[Julian Andres Klode]

I have reverfied from the autopkgtest runs that the specified tests have
passed in all releases:

- 1.7.4 in cosmic
- 1.6.10 in bionic
- 1.2.31 in xenial
- 1.0.1ubuntu2.22 in trusty

** Tags removed: verification-needed verification-needed-bionic verification-needed-cosmic verification-needed-trusty verification-needed-xenial
** Tags added: verification-done verification-done-bionic verification-done-cosmic verification-done-trusty verification-done-xenial

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https://bugs.launchpad.net/bugs/1814727

Title:
  Backport never pinning and Packages-Require-Authorization

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Trusty:
  Fix Committed
Status in apt source package in Xenial:
  Fix Committed
Status in apt source package in Bionic:
  Fix Committed
Status in apt source package in Cosmic:
  Fix Committed
Status in apt source package in Disco:
  Fix Released

Bug description:
  [Impact]
  These are not driven from a direct user experience, but are related to other developments:

  (1) unattended-upgrades could use the never pinning to disable
  repositories rather than switching candidates. That would simplify
  code quite a bit.

  (2) Packages-Require-Authorization lets a repository declare that
  downloading packages from it requires authorization. This is useful
  both for private repositories, as it can prevent unattended-upgrades
  failures if you remove authorization info; and it also allows creating
  a new form of semi-private repository, where only pool/ requires
  authorization.

  [Test case]
  Tests are included in autopkgtests and cover the common scenarios
  https://salsa.debian.org/apt-team/apt/blob/master/test/integration/test-packages-require-authorization:
  (1) Add repository with Packages-Require-Authorization and no auth.conf entry: pin -32768
  (2) Add repository with Packages-Require-Authorization and a auth.conf entry: pin 500
  (3) As (2), but a custom pin still applies

  https://salsa.debian.org/apt-team/apt/blob/master/test/integration/test-policy-pinning#L365
  (1) Test that Pin-Priority: never overrides both per-package pins and per-repository pins
  (2) Test that Pin-Priority: never is only applied for per-repository (Package: *) pins

  [Regression potential]
  The changes might introduce regressions in pinning. The pinning implementation in trusty is substantially different from the other releases, and should thus require more testing.

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