[Bug 1878769] Re: [SRU] updates to the maas deb2snap package

[Steve Langasek]

Hello Alberto, or anyone else affected,

Accepted maas into focal-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/maas/1:0.7 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-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. 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: maas (Ubuntu Focal)
       Status: New => Fix Committed

** Tags added: verification-needed verification-needed-focal

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https://bugs.launchpad.net/bugs/1878769

Title:
  [SRU] updates to the maas deb2snap package

Status in maas package in Ubuntu:
  New
Status in maas source package in Focal:
  Fix Committed

Bug description:
  The current (1:0.6) maas packages in focal provide transition to the
  MAAS snap.

  This is currently done by getting maas from "stable/ubuntu-$release" for the default branch (which is currently 2.7).
  We want to change this to ensure a consistent behavior, always installing 2.7 even once a new release becomes the default track.

  The attached MP implement this, along with a few fixes/cleanups for the current preinst logic.
  Specifically, the current package doesn't handle an upgrade from a previous version of the transitional package.

  
  [Impact]
  * upgrading to focal currently migrates to the stable/ubuntu-20.04 snap, which is currently 2.7 but will be 2.8 in the future 

  [Testcase]
  * Install maas on bionic (either from archive or ppa:maas/2.6)
  * Upgrade to focal.
  * `snap info maas` shows snap installed from `2.7/stable/ubuntu-20.04`

  [Regression potential]
  * Regression potential is low, aside from the desired change in behavior selecting snap channel the branch prvoides a fix for the case of upgrading the transitional package to a newer version.

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