[Bug 1502291] Re: 'do-release-upgrade -d' should always offer to upgrade to the most recent development release

[Brian Murray]

We want to provide users the safest upgrade path from one release to
another as such we going to keep it so that the '-d' switch will only
take you to the development release of Ubuntu if you are running the
release immediately before the development one. If testers want to test
the upgrade path described in the description, from Trusty to Wily, then
they can create a local version of the meta-release-development file
with the desired from and to releases.

** Changed in: update-manager (Ubuntu)
       Status: Triaged => Won't Fix

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Title:
  'do-release-upgrade -d' should always offer to upgrade to the most
  recent development release

Status in update-manager package in Ubuntu:
  Won't Fix

Bug description:
  On Trusty, 'do-release-upgrade -d' is currently offering an upgrade to
  14.10. It should offer to upgrade to Wily, because Wily is the current
  development release.

  It makes sense if we are skipping versions for stable releases to also
  skip versions for development releases. The code in update-manager
  parses the meta-release files to determine which release to upgrade.
  As an example here is the meta-release-development entry for Utopic.

  Dist: utopic
  Name: Utopic Unicorn
  Version: 14.10
  Date: Thu, 23 Oct 2014 14:10:00 UTC
  Supported: 0
  Description: This is the 14.10 release
  Release-File: http://archive.ubuntu.com/ubuntu/dists/utopic/Release
  ReleaseNotes: http://changelogs.ubuntu.com/EOLReleaseAnnouncement
  UpgradeTool: http://archive.ubuntu.com/ubuntu/dists/utopic/main/dist-upgrader-all/current/utopic.tar.gz
  UpgradeToolSignature: http://archive.ubuntu.com/ubuntu/dists/utopic/main/dist-upgrader-all/current/utopic.tar.gz.gpg

  We currently just check the date and supported status to determine to
  which release to upgrade, as the meta release files don't really
  contain information about whether or not a release is obsolete. If we
  are running with the -d switch we could check to see if the release
  date is greater than today. There should probably be a fudge factor of
  a day though as otherwise people may not be able to upgrade on release
  day.

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