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

[Robie Basak]

See also: bug 1915547

> It is highly unlikely that the configuration file on one distro is
replaced with one that was shipped on a different one.

I think it's more likely than you say in cases that a configuration
shipped is primarily a set of boolean values and enumerations of a
limited set of strings, and the difference in distributions is mostly in
choices of those values. The extreme example would be a configuration
file that ships just one boolean setting. I think this unattended-
upgrades case is closer to that extreme example than it is to openssh's
sshd_config.

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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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