[Bug 1917677] [NEW] ubuntu: ucf tracking of valid known md5sums should be limited to only those md5sums that affect a given distro release

[Chad Smith]

Public bug reported:

Currently the project tracks all valid md5sums of permutations of
50unattended-upgrades.conf in a single md5sum file that contains every
md5sum of every historic version of all unique distros:

 50unattended-upgrades.Debian
 50unattended-upgrades.Devuan
 50unattended-upgrades.Raspbian
 50unattended-upgrades.Ubuntu

Ultimately ucf for a given packaging release should only track the
applicable md5sums which are expected to be seen on that particular
distribution and release.

For example:
   On Ubuntu Bionic: valid md5sums should be limited to the md5sum of the most recent Ubuntu Xenial 50unattended-upgrades.conf and the md5sums of previous Ubuntu Bionic releases to allow Xenial->Bionic and Bionic->Bionic upgrades without prompt.

** Affects: unattended-upgrades (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: unattended-upgrades (Ubuntu Bionic)
     Importance: Undecided
         Status: New

** Affects: unattended-upgrades (Ubuntu Focal)
     Importance: Undecided
         Status: New

** Affects: unattended-upgrades (Ubuntu Groovy)
     Importance: Undecided
         Status: New

** Affects: unattended-upgrades (Ubuntu Hirsute)
     Importance: Undecided
         Status: New

** Also affects: unattended-upgrades (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: unattended-upgrades (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Also affects: unattended-upgrades (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

** Also affects: unattended-upgrades (Ubuntu Bionic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1917677

Title:
  ubuntu: ucf tracking of valid known md5sums   should be limited to
  only those md5sums that affect a given distro release

Status in unattended-upgrades package in Ubuntu:
  New
Status in unattended-upgrades source package in Bionic:
  New
Status in unattended-upgrades source package in Focal:
  New
Status in unattended-upgrades source package in Groovy:
  New
Status in unattended-upgrades source package in Hirsute:
  New

Bug description:
  Currently the project tracks all valid md5sums of permutations of
  50unattended-upgrades.conf in a single md5sum file that contains every
  md5sum of every historic version of all unique distros:

   50unattended-upgrades.Debian
   50unattended-upgrades.Devuan
   50unattended-upgrades.Raspbian
   50unattended-upgrades.Ubuntu

  Ultimately ucf for a given packaging release should only track the
  applicable md5sums which are expected to be seen on that particular
  distribution and release.

  For example:
     On Ubuntu Bionic: valid md5sums should be limited to the md5sum of the most recent Ubuntu Xenial 50unattended-upgrades.conf and the md5sums of previous Ubuntu Bionic releases to allow Xenial->Bionic and Bionic->Bionic upgrades without prompt.

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