[Bug 1809027] Re: Make retired Ubuntu keyrings available from the archive

[Scott Moser]

The easiest thing to do would be to just ship a keyring that had the
obsolete public signing keys.  Then the consumer could hard code
that 'precise' was signed with keys A, B, C.  and work stuff out like
that.

Alternatively possibly we might want to deliver some distro-info like
data.

ubuntu-release|
fingerprint | status | used-releases
790BC7277767219C42C86F933B4FE6ACC0B21F32 | expired | precise quantal raring saucy trusty utopic ...
F6ECB3762474EDA9D21B7022871920D1991BC93C | current | trusty utopic vivid wily xenial yakkety ...

Then the consumer expecting to verify 'precise' data could determine
they should use the 790B key.

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https://bugs.launchpad.net/bugs/1809027

Title:
  Make retired Ubuntu keyrings available from the archive

Status in ubuntu-keyring package in Ubuntu:
  New

Bug description:
  Currently, if an Ubuntu developer (or their code) is attempting to
  interact with the precise archive (which is still supported in some
  form via ESM) from a machine running bionic or later, they will run in
  to issues verifying signatures, because the keys used to sign the
  precise archive are no longer included in the default keyring as of
  bionic.

  (Some form of this problem will present every time an archive key
  rotation happens; eventually the old key will no longer be trusted,
  and similar failures to the ones today will occur.)

  Whilst the old keys should never be used by the system's apt (or other
  installed software), it would be good if there were some way to
  install those keys from the archives for projects which knowingly want
  to use the older signatures.  (The old keys should be in a path that
  isn't currently used by anything, so that they have to be explicitly
  used.)

  (This bug came out of a discussion on
  https://code.launchpad.net/~smoser/vmbuilder/mfdiff-apt-key-
  transition/+merge/313797.)

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