[Bug 1780841] Re: ubuntu-release-upgrader should transition debs to snaps

Wed Jul 11 23:59:31 UTC 2018

Tested an upgrade from Ubuntu 16.04 to Ubuntu 18.04:

bdmurray at clean-xenial-amd64:/tmp/u-r-u$ head /var/log/dist-upgrade/main.log 
2018-07-11 15:30:56,243 INFO Using config files '['./DistUpgrade.cfg.xenial']'
2018-07-11 15:30:56,243 INFO uname information: 'Linux clean-xenial-amd64 4.4.0-121-generic #145-Ubuntu SMP Fri Apr 13 13:47:23 UTC 2018 x86_64'
2018-07-11 15:30:56,530 INFO apt version: '1.2.26'
2018-07-11 15:30:56,531 INFO python version: '3.5.2 (default, Nov 23 2017, 16:37:01) 
[GCC 5.4.0 20160609]'
2018-07-11 15:30:56,534 INFO release-upgrader version '18.04.20' started
2018-07-11 15:30:56,537 INFO locale: 'en_US' 'UTF-8'
2018-07-11 15:30:56,756 DEBUG Using 'DistUpgradeViewText' view
2018-07-11 15:30:56,801 DEBUG enable dpkg --force-overwrite
2018-07-11 15:30:56,834 DEBUG creating statefile: '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'
bdmurray at clean-xenial-amd64:/tmp/u-r-u$ snap list
Name                  Version    Rev   Tracking  Developer  Notes
core                  16-2.33.1  4917  stable    canonical  core
gnome-3-26-1604       3.26.0     70    stable    canonical  -
gnome-calculator      3.28.2     180   stable/…  canonical  -
gnome-characters      3.28.2     103   stable/…  canonical  -
gnome-logs            3.28.2     37    stable/…  canonical  -
gnome-system-monitor  3.28.2     51    stable/…  canonical  -
gtk-common-themes     0.1        319   stable/…  canonical  -
bdmurray at clean-xenial-amd64:/tmp/u-r-u$ for p in gnome-calculator gnome-characters gnome-logs gnome-system-monitor; do apt-cache policy $p; done
gnome-calculator:
  Installed: 1:3.28.1-1ubuntu1
  Candidate: 1:3.28.1-1ubuntu1
  Version table:
 *** 1:3.28.1-1ubuntu1 500
        500 http://192.168.10.7/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status
gnome-characters:
  Installed: (none)
  Candidate: 3.28.2-0ubuntu1
  Version table:
     3.28.2-0ubuntu1 500
        500 http://192.168.10.7/ubuntu bionic-updates/main amd64 Packages
     3.28.0-3 500
        500 http://192.168.10.7/ubuntu bionic/main amd64 Packages
gnome-logs:
  Installed: (none)
  Candidate: 3.28.0-1
  Version table:
     3.28.0-1 500
        500 http://192.168.10.7/ubuntu bionic/main amd64 Packages
gnome-system-monitor:
  Installed: (none)
  Candidate: 3.28.2-0ubuntu1
  Version table:
     3.28.2-0ubuntu1 500
        500 http://192.168.10.7/ubuntu bionic-updates/main amd64 Packages
     3.28.1-1 500
        500 http://192.168.10.7/ubuntu bionic/main amd64 Packages

The fact that gnome-calculator was not removed was expected because
unity-scope-calculator depends on it. From /var/log/dist-
upgrade/main.log:

2018-07-11 16:55:42,517 DEBUG Start checking for obsolete pkgs
2018-07-11 16:56:07,402 DEBUG package 'gnome-calculator' has unwanted removals, skipping
2018-07-11 16:56:11,692 DEBUG 'gnome-calculator' scheduled for remove but not safe to remove, skipping
2018-07-11 16:56:26,776 DEBUG Finish checking for obsolete pkgs

This completes the main verification of the SRU there is still some
additional testing needed though.

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https://bugs.launchpad.net/bugs/1780841

Title:
  ubuntu-release-upgrader should transition debs to snaps

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Bionic:
  Fix Committed

Bug description:
  For new installs the desktop version of Ubuntu 18.04 includes snap
  apps of some utilities[1]. To ensure that there is little difference
  between a system upgrading between releases of Ubuntu and fresh
  installs ubuntu-release-upgrader should be modified to install the
  snap format of those utilities and remove the deb format package. This
  should only be done for Ubuntu Desktop installs and if the system has
  a connection to the Snap Store.

  [Test Case]
  1) Install an Ubuntu desktop system with Ubuntu 16.04
  2) Upgrade to Ubuntu 18.04
  3) Run 'snap list'

  With the version of ubuntu-release-upgrader from -proposed you should
  see snaps installed for gtk-common-themes, gnome-calculator, gnome-
  characters, gnome-logs, gnome-system-monitor.  Additionally, the deb
  version of those four packages should be removed, although if one of
  the snaps failed to install then the corresponding deb would not be
  removed.

  It also be good to test that it is still possible to upgrade without a
  connection to the Snap store and to test this only happens on a system
  with ubuntu-desktop installed.

  [Regression Potential]
  Its possible that the snaps could be install on a system without ubuntu-desktop so we should explicitly test that scenario. The snaps installed should be tested briefly to ensure they are launchable and we don't leave upgraders without a calculator.

  [Note]
  This has been done in a DistUpgradeQuirk and will look different for Cosmic than Bionic as the function name includes the release i.e. cosmicPostUpgrade vs bionicPostUpgrade.

  [1] https://wiki.ubuntu.com/BionicBeaver/ReleaseNotes#Ubuntu_Desktop

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