[Bug 2150665] Re: cephadm: missing Depends on python3-ceph-common

[Luciano Lo Giudice]

This bug is being handled with the SRU for 20.2.1:
https://bugs.launchpad.net/ubuntu/+source/ceph/+bug/2151199

[ Impact ]

 * cephadm fails to run due to missing dependencies. In particular, the Ceph
   Python ceph-common package is missing.
   
 * The new packages will solve this by adding the necessary dependencies.

[ Test Plan ]

 * In order to test this, the functional tests for Canonical's Ceph containers
   repository will be run (https://github.com/canonical/ceph-containers).

 * These tests involve using the cephadm tool for cluster deployment using
   Canonical's custom Ceph images.

 * If the new packages fix this issue, the tests will run to completion.

[ Where problems could occur ]

 * cephadm is used as a simple tool to deploy Ceph clusters. Notably, neither
   the Ceph charms nor Microceph make use of it, but users of Ubuntu can make
   use of it independently.

 * Any problems with cephadm will thus prevent users from deploying their own
   Ceph clusters with the exceptions noted above.

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https://bugs.launchpad.net/bugs/2150665

Title:
  cephadm: missing Depends on python3-ceph-common

Status in ceph package in Ubuntu:
  Confirmed

Bug description:
  The cephadm binary package in resolute (20.2.0-0ubuntu2) imports
  ceph.cephadm.images at startup but does not declare a Depends on
  python3-ceph-common which provides that module. Running
  `cephadm bootstrap` (or any cephadm subcommand) on a fresh install
  fails immediately with:

    Traceback (most recent call last):
      File "/usr/sbin/cephadm", line 141, in <module>
        from cephadmlib import runscripts
      File "/usr/lib/python3/dist-packages/cephadmlib/runscripts.py", line 10, in <module>
        ...
      File "/usr/lib/python3/dist-packages/cephadmlib/container_types.py", line 12, in <module>
        from ceph.cephadm.images import DefaultImages
    ModuleNotFoundError: No module named 'ceph'

  Currently declared Depends are only `lvm2 | python3` per
  https://packages.ubuntu.com/resolute/cephadm.

  Reproducer (LXD VM):
    $ lxc launch --vm ubuntu:26.04 c1
    $ lxc shell c1 -- apt-get update
    $ lxc shell c1 -- apt-get install -y cephadm
    $ lxc shell c1 -- cephadm version
    ModuleNotFoundError: No module named 'ceph'

  Workaround:
    apt-get install -y cephadm python3-ceph-common

  Expected fix: add `python3-ceph-common (>= ${binary:Version})` to
  cephadm's Depends in debian/control. The squid (19.x) cephadm in noble
  shipped as a single-file script with no Python imports beyond the
  stdlib, so this regression is specific to the Tentacle refactor that
  moved logic into cephadmlib/ and ceph/cephadm/.

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