[Bug 1645906] Re: new dist-upgrader tarballs necessary so they are signed with 4k key

[Launchpad Bug Tracker]

** Branch linked: lp:ubuntu/trusty-proposed/ubuntu-release-upgrader

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https://bugs.launchpad.net/bugs/1645906

Title:
  new dist-upgrader tarballs necessary so they are signed with 4k key

Status in ubuntu-release-upgrader package in Ubuntu:
  New
Status in ubuntu-release-upgrader source package in Precise:
  New
Status in ubuntu-release-upgrader source package in Trusty:
  In Progress
Status in ubuntu-release-upgrader source package in Xenial:
  In Progress
Status in ubuntu-release-upgrader source package in Yakkety:
  Fix Committed

Bug description:
  With the ubuntu-archive-publishing change in
  https://code.launchpad.net/~xnox/ubuntu-archive-publishing/migrate-
  dist-upgrade-to-4k/+merge/311181 the signing process for the dist-
  upgrader tarball has been changed.  This change should be tested now,
  rather than doing an ubuntu-release-upgrader change months from now
  and wondering why things aren't working (if they are broken).

  Due to the way the gpg signature is generated we can't just remove it
  and have it regenerated as the timestamp for the signature will not
  change, so the change will not propogate to the mirrors.  Hence the
  need for a mostly no change (mirrors and demotions may change) upload
  of ubuntu-release-upgrader.

  Test Case
  ---------
  1) run do-release-upgrade -p --frontend DistUpgradeViewText
  2) ensure the tarball for the next release e.g. xenial.tar.gz is downloaded and the signature verification passes

  Regression Potential
  --------------------
  It's possible the signing is wrong and the verification of the signature will fail thereby causing release upgrades to be impossible.

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