[Bug 1892516] Re: uuidgen possible problem with v3 uuids

[Dave Ford]

We've not yet moved to U20 LTS due to block on the upgrade path - but I
note that after downloading and testing the same on U20 20.04 TLS, the
behaviour of uuidgen has changed

uuidgen --namespace @dns --name 'foo' -m
3f46ae03-c654-36b0-a55d-cd0aa042c9f2

So clearly this has changed between the V 2.34 on U20 and V 2.31.1 on
U18.

This is all rather unfortunately as these are supposed to be
deterministic.  Should I expect that the behaviour of uuidgen to change
on the older LTS versions? Or does the LTS status indicate that this
different version wouldn't be backported?

As long I know how/when these uuid's are generated I can work around it
(or just use sha1 versions).

Thanks!

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https://bugs.launchpad.net/bugs/1892516

Title:
  uuidgen possible problem with v3 uuids

Status in util-linux package in Ubuntu:
  New

Bug description:
  Generating a version 3 uuid on Ubuntu appears to be producing
  inconsistent output compared to online checkers and versions of this
  tool compiled on different OSs.  E.g.

  On U18.04.5
  uuidgen --namespace @dns --name 'foo' -m  (version 3 using md5)
  3f46ae03-c654-36b0-855d-cd0aa042c9f2

  uuidgen --namespace @dns --name 'foo' -s (version 5 with sha1)
  b84ed8ed-a7b1-502f-83f6-90132e68adef

  On Gentoo,
  uuidgen --namespace @dns --name 'foo' -m
  3f46ae03-c654-36b0-a55d-cd0aa042c9f2   (note a55d rather than 855d)

  uuidgen --namespace @dns --name 'foo' -s
  b84ed8ed-a7b1-502f-83f6-90132e68adef

  On raspbian
  uuidgen --namespace @dns --name 'foo' -m
  3f46ae03-c654-36b0-a55d-cd0aa042c9f2   (note a55d same as on gentoo)

  uuidgen --namespace @dns --name 'foo' -s
  b84ed8ed-a7b1-502f-83f6-90132e68adef

  Looking at this https://github.com/karelzak/util-linux/issues/683

  gave me pause to see if I could replicate this similar problem
  On Ubuntu, using the python library I get
  python -c "import uuid ; print(uuid.uuid3(uuid.UUID('6ba7b810-9dad-11d1-80b4-00c04fd430c8'), 'foo'))"
  3f46ae03-c654-36b0-a55d-cd0aa042c9f2

  The same result is returned on raspbian and Gentoo.

  This makes me wonder if there's a problem with the uuidgen tool, as
  python is giving me consistent results on all three OS's and agrees
  with the uuidgen tool in Gentoo and Raspbian and also agrees with the
  output of this webtool

  https://uuidonline.com/

  and this

  https://www.uuidtools.com/v3

  Ubuntu is producing a different result.

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