[Bug 1803162] Re: non-dpkg information and broken format in manifest

[Steve Langasek]

We have never represented the .manifest to be a public machine-parseable
interface.  Why should we not expect it to be the responsibility of
whatever you have that is parsing these files to adapt?

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https://bugs.launchpad.net/bugs/1803162

Title:
  non-dpkg information and broken format in manifest

Status in cloud-images:
  Incomplete
Status in livecd-rootfs package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu images have been accompanied by a 'manifest' file since at least 10.04.
  This manifest file was a list of the dpkg installed packages and their versions.
  The format was as output by dpkg-query --show.
  That format was
    package-name<tab>version

  The offending change was added at
  https://bazaar.launchpad.net/~ubuntu-core-dev/livecd-rootfs/trunk/revision/1706

  The disco images now contain non-dpkg information in them.
  There are a few problems with this:
   a.) the format is now changed.  Some lines will now have 3 fields rather than 2.
   b.) content is not strictly a list of dpkg information.

  I understand the desire to have pre-seeded snap information in this file
  but believe that the correct way to add representation of that information
  is with new files rather extending in non-backwards compatible ways an
  existing file.

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