[Bug 1823410] Re: utils.py's url_downloadable doesn't support https

[Launchpad Bug Tracker]

This bug was fixed in the package ubuntu-release-upgrader - 1:19.04.15

---------------
ubuntu-release-upgrader (1:19.04.15) disco; urgency=medium

  * debian/control: build depend on the new version of update-manager which
    supports checking to see if an https url is downloadable. (LP: #1823410)
  * tests/test_sources.list.py: add a test for https support.
  * Update of demotions and mirrors data.
  * DistUpgrade/DistUpgradeQuirks.py: update the deb2snap quirk for disco,
    bump the version of gnome snap, and include the core18 snap.

 -- Brian Murray <brian at ubuntu.com>  Mon, 08 Apr 2019 14:19:29 -0700

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: In Progress => Fix Released

** Changed in: update-manager (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1823410

Title:
  utils.py's url_downloadable doesn't support https

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in update-manager package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Bionic:
  Triaged
Status in update-manager source package in Bionic:
  Triaged
Status in ubuntu-release-upgrader source package in Cosmic:
  Triaged
Status in update-manager source package in Cosmic:
  Triaged

Bug description:
  In the interest of improving release upgrades for users of PPAs a
  check was added to ubuntu-release-upgrader to see if the release to
  which the system is being upgraded is provided by a sources list entry
  and if it is not that entry is disabled. This check uses the function
  url_downloadable which is provided by update-manager's utils.py. Come
  to find out the url_downloadable check only supports ftp and http, not
  https. This can cause a situation where upgrades to the next release
  of Ubuntu fail if the system's mirror of the Ubuntu archive is using
  https. This is mentioned here -
  https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-
  upgrader/+bug/1807043/comments/10.

  While the bug manifests itself in ubuntu-release-upgrader it needs
  fixing in update-manager and will require a rebuild of ubuntu-release-
  upgrader which has a symlink to utils.py which is shipped in the dist-
  upgrader tarball.

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