[Bug 1218612] Re: Support new version number scheme

[Barry Warsaw]

** Changed in: system-image (Ubuntu)
       Status: New => Fix Released

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Title:
  Support new version number scheme

Status in Ubuntu system image (server/client/updater):
  Fix Released
Status in “system-image” package in Ubuntu:
  Fix Released

Bug description:
  After discussions, we've decided to change the image version numbering
  scheme to be sequential from 1.  There are no additional semantics
  associated with version numbers.  The only constraint is that version
  numbers must fit in 16 bits.

  The client must be updated to a new hashing algorithm for Image
  objects to look at the version number (in full updates) or
  base+version (in deltas).  If the version numbers are < 20000000
  (could just be 20130000 but some existing tests use earlier years),
  then just use the version number directly (after verifying they are <=
  16 bits wide).  For version numbers >= 20000000 we continue to use the
  old hashing algorithm.

  Nothing about candidate path calculation changes.  E.g. 20130835 is
  still > 1 so once the new version numbers are available on the server,
  you will have to force update via `system-image-cli -b 0
  --filter=full`.

  Since this is very high priority, I will add a few tests of the new
  version numbering scheme, but I won't modify any existing tests that
  use the old version number scheme.  Best effort will be made to test
  this against a live channel with new version numbers, but we accept
  that some bugs in the client may still after release requiring manual
  intervention.  Once we retire the old version numbers, a tech-debt bug
  will be opened to fix all the old tests.

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