[Bug 1960065] Re: cloud archive: apt upgrade from rocky to stein keeps back some ceph packages

[James Page]

Stepping between UCA pockets is really akin to a distribution upgrade so
I think its appropriate that only a dist-upgrade action would complete
the transition correctly (or an install as detailed in #8).

We could provide transitional packages but this would need to be done as
patches ontop of the ceph packages from the associated source Ubuntu
repository and as there is a clear path to complete an upgrade
successfully I'm reticent to follow this path.

** Changed in: ceph (Ubuntu)
       Status: Triaged => Invalid

** Changed in: ceph (Ubuntu)
       Status: Invalid => Won't Fix

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Title:
  cloud archive: apt upgrade from rocky to stein keeps back some ceph
  packages

Status in ceph package in Ubuntu:
  Won't Fix

Bug description:
  The ceph python2 packages have been dropped between rocky and stein.
  (in Disco, from 13.2.1+dfsg1-0ubuntu3 to 13.2.2+dfsg1-0ubuntu1 [1]).

  The packages python-{cephfs,rados,rbd} have no upgrades, but have
  exact versioned dependencies on packages that have upgrades.

  So, during `apt upgrade` the former block the latter from being
  upgraded, which in turn block  other ceph packages from being upgraded
  (e.g., ceph-{common,mon,osd,mgr}).

  Note this isn't a problem on `apt full-upgrade` or `apt dist-upgrade`
  as these allow package removals (`apt upgrade` does not), then `apt`
  just decides to remove those 3 packages.

  It's possible to fix this with dummy transitional packages that remove
  the exact versioned dependency (patch provided/tested in comment #5).

  [1] https://launchpad.net/ubuntu/+source/ceph/13.2.2+dfsg1-0ubuntu1

  Steps to Reproduce:
  ---

  Setup Bionic container:

  $ lxc launch ubuntu:bionic bionic-uca
  $ lxc exec bionic-uca -- su - ubuntu

  $ sudo apt --yes purge unattended-upgrades
  $ sudo apt update

  Install ceph from Bionic (Queens):

  $ sudo apt --yes install ceph

  $ dpkg -s ceph | grep Version
  Version: 12.2.13-0ubuntu0.18.04.10

  Upgrade to UCA Rocky:

  $ sudo add-apt-repository --yes cloud-archive:rocky

  $ sudo apt --dry-run upgrade
  ...
  The following packages will be upgraded:
    ceph ceph-base ceph-common ceph-mgr ceph-mon ceph-osd libcephfs2 librados2 libradosstriper1 librbd1 python-cephfs python-pecan python-rados python-rbd
    python-webob python3-jsonpatch
  ...

  $ sudo apt --yes upgrade

  $ dpkg -s ceph | grep Version
  Version: 13.2.8-0ubuntu0.18.10.1~cloud0

  Upgrade to UCA Stein:

  $ sudo add-apt-repository --yes cloud-archive:stein

  $ sudo apt --dry-run upgrade
  ...
  The following packages have been kept back:
    ceph ceph-base ceph-common ceph-mgr ceph-mon ceph-osd libcephfs2 librados2 libradosstriper1 librbd1
  ...

  Issue above.

  Check:
  ---

  $ sudo apt -o Debug::pkgProblemResolver=1 --dry-run upgrade
   ...
   Entering ResolveByKeep 10%

     Dependencies are not satisfied for python-cephfs:amd64 < 13.2.8-0ubuntu0.18.10.1~cloud0 @ii mK Ib >
   Keeping package python-cephfs:amd64
     Dependencies are not satisfied for python-cephfs:amd64 < 13.2.8-0ubuntu0.18.10.1~cloud0 @ii mK Ib >
   Package python-cephfs:amd64 python-cephfs:amd64 Depends on libcephfs2:amd64 < 13.2.8-0ubuntu0.18.10.1~cloud0 -> 13.2.9-0ubuntu0.19.04.1~cloud3 @ii umU > (= 13.2
   .8-0ubuntu0.18.10.1~cloud0)
     Keeping Package libcephfs2:amd64 due to Depends

  ...

  Details:
  -------

  python-cephfs at version 13.2.__8__ has exact version dep on
  libcephfs2, which is being upgraded to 13.2.__9__.

  Why isn't python-cephfs being upgraded to 13.2.__9__ too?

  AH, there's no 13.2.__9__ version for python-cephfs, only for libcephfs2.
  So, it stopped on 13.2.__8__ in UCA Rocky, there's no 13.2.__9__ in UCA Stein, as there's for libcephfs2.

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