[Bug 1905986] Re: Don't provide transitional package for python3-google-compute-engine, add Breaks: in google-guest-agent instead

[Łukasz Zemczak]

Hello Balint, or anyone else affected,

Accepted gce-compute-image-packages into groovy-proposed. The package
will build now and be available at https://launchpad.net/ubuntu/+source
/gce-compute-image-packages/20201222.00-0ubuntu2~20.10.0 in a few hours,
and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
groovy to verification-done-groovy. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-groovy. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: gce-compute-image-packages (Ubuntu Groovy)
       Status: New => Fix Committed

** Tags added: verification-needed verification-needed-groovy

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https://bugs.launchpad.net/bugs/1905986

Title:
  Don't provide transitional package for python3-google-compute-engine,
  add Breaks: in google-guest-agent instead

Status in gce-compute-image-packages package in Ubuntu:
  New
Status in google-guest-agent package in Ubuntu:
  Fix Released
Status in gce-compute-image-packages source package in Groovy:
  Fix Committed

Bug description:
  [Impact]

   * gce-compute-image-packages has been split to multiple source packages and google-guest-agent (written in Go) replaced the services originally written in Python. The upgrade to gce-compute-image-packages compatible with google-guest-agent replaced the Python modules (python3-google-compute-engine) with an empty transitional package. The removal of the modules could break local software relying on those modules.
   * The fix is not providing the empty python3-google-compute-engine transitional package, but adding Breaks: to google-guest-agent to force the removal of it. Since removals are not performed automatically by apt-get upgrade (not unattended-upgrades) the administrator needs to approve removal.

  [Test Case]

   * Set up a system with the unfixed version of the packages, including python3-google-compute-engine installed.
   * Upgrade to the new set of packages:
     apt-get upgrade
   * Observe that the gce-compute-image-packages is kept back
   * Upgrade gce-compute-image-package manually:
     apt install gce-compute-image-package
   * This should succeed, removing python3-google-compute-engine

  [Where problems could occur]

   * The packages may become uninstallable upon upgrade or dist-upgrade.
  Testing was performed to avoid such regressions.

   * Since the aim of this fix is preventing accidental upgrades should
  a security update of the affected packages be released the fix will
  prevent automatic application of this updated. In such case the the
  transitional package can be reintroduced and the Breaks: can be
  converted to a versioned Breaks: on the non-transitional package
  versions.

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