[Bug 1919261] Re: Upgrading Ceph from 14.2.11-0ubuntu0.19.10.1~cloud4 to 15.2.8-0ubuntu0.20.04.1~cloud0 fails when ceph-mds is installed

[Tyler Stachecki]

Hello,

I tried to verify this SRU, but halfway through the process... realized
I was pulling from -updates (current) and not -proposed... and even so,
I could not replicate the bug:

So I guess it's fixed?
Tyler

---

# Boot a clean cloud-init'd 18.04 image:
ubuntu at dev-10-34-138-116:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.6 LTS
Release: 18.04
Codename: bionic

# Configure apt to internal mirror of Train UCA on this LP's file date (2021-03-15)
...

# Install ceph-mds, verify the intended version was installed:
ubuntu at dev-10-34-138-116:~$ sudo DEBIAN_PRIORITY=critical DEBIAN_FRONTEND=noninteractive apt-get install -y ceph-mds
...
ubuntu at dev-10-34-138-116:~$ dpkg-query -W ceph-mds
ceph-mds 14.2.11-0ubuntu0.19.10.1~cloud4

# Remove train UCA and do-release-upgrade
...
ubuntu at dev-10-34-138-116:~$ sudo apt-get update
ubuntu at dev-10-34-138-116:~$ sudo apt -yu full-upgrade
ubuntu at dev-10-34-138-116:~$ sudo apt -y install ubuntu-release-upgrader-core
ubuntu at dev-10-34-138-116:~$ sudo do-release-upgrade -f DistUpgradeViewNonInteractive
...

# Ceph upgraded without failure:
ubuntu at dev-10-34-138-116:~$ dpkg-query -W ceph-mds
ceph-mds 15.2.14-0ubuntu0.20.04.2

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https://bugs.launchpad.net/bugs/1919261

Title:
  Upgrading Ceph from 14.2.11-0ubuntu0.19.10.1~cloud4 to
  15.2.8-0ubuntu0.20.04.1~cloud0 fails when ceph-mds is installed

Status in Ubuntu Cloud Archive:
  Invalid
Status in Ubuntu Cloud Archive ussuri series:
  Fix Committed
Status in ceph package in Ubuntu:
  Invalid
Status in ceph source package in Focal:
  Fix Committed

Bug description:
  [Impact]
  Package upgrades will fail due to a move of a file between packages

  [Test Case]
  Install ceph-mds 14.2.11-0ubuntu0.19.10.1~cloud4 (from UCA) on bionic
  do-release-upgrade to focal
  package upgrade will fail.

  [Where problems could occur]
  Version declarations might not be correct; upgrade might still break with the same conflict.

  [Original Bug Report]
  In a host where ceph-mds is installed, upgrading from 14.2.11-0ubuntu0.19.10.1~cloud4 to 15.2.8-0ubuntu0.20.04.1~cloud0 fails with:

  dpkg: error processing archive /tmp/apt-dpkg-install-Zen6uw/9-ceph-common_15.2.8-0ubuntu0.20.04.1~cloud0_amd64.deb (--unpack):
   trying to overwrite '/usr/bin/cephfs-data-scan', which is also in package ceph-mds 14.2.11-0ubuntu0.19.10.1~cloud4
  dpkg-deb: error: paste subprocess was killed by signal (Broken pipe)
  Errors were encountered while processing:
   /tmp/apt-dpkg-install-Zen6uw/9-ceph-common_15.2.8-0ubuntu0.20.04.1~cloud0_amd64.deb
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  The problem happens because /usr/bin/cephfs-data-scan is provided by
  ceph-mds in 14.2.11-0ubuntu0.19.10.1~cloud4:

  # dpkg -S /usr/bin/cephfs-data-scan
  ceph-mds: /usr/bin/cephfs-data-scan

  However in 15.2.8-0ubuntu0.20.04.1~cloud0 it is provided by ceph-
  common:

  # dpkg -S /usr/bin/cephfs-data-scan
  ceph-common: /usr/bin/cephfs-data-scan

  A quick workaround is to temporarily remove ceph-mds before the
  upgrade (dpkg -r ceph-mds) and then perform the upgrade process using
  apt install. It will upgrade all packages and reinstall ceph-mds.

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