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

[Brian Murray]

** Description changed:

  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.
+ 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.

** Also affects: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided
       Status: New

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

** Changed in: ubuntu-release-upgrader (Ubuntu)
     Assignee: (unassigned) => Brian Murray (brian-murray)

** Changed in: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided => High

** Changed in: ubuntu-release-upgrader (Ubuntu Bionic)
       Status: New => Triaged

** Changed in: ubuntu-release-upgrader (Ubuntu Cosmic)
       Status: New => Triaged

** Changed in: ubuntu-release-upgrader (Ubuntu Bionic)
   Importance: Undecided => High

** Changed in: ubuntu-release-upgrader (Ubuntu Cosmic)
   Importance: Undecided => High

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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:
  In Progress
Status in update-manager package in Ubuntu:
  In Progress
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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