[Bug 1836713] Re: upgrade of openvswitch packages resets alternative binaries to auto

[Corey Bryant]

This bug was fixed in the package openvswitch - 2.11.5-0ubuntu0.19.04.1~cloud0
---------------

 openvswitch (2.11.5-0ubuntu0.19.04.1~cloud0) bionic; urgency=medium
 .
   * d/openvswitch-switch{-dpdk}.prerm,postinst: Tidy with case statements,
     only remove alternatives when package is being removed (LP: #1836713).
   * New upstream point release (LP: #1912225) including security fixes for:
   * SECURITY UPDATE: buffer overflow decoding malformed packets in lldp
     - CVE-2015-8011
   * SECURITY UPDATE: Externally triggered memory leak in lldp
     - CVE-2020-27827


** Changed in: cloud-archive/stein
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1836713

Title:
  upgrade of openvswitch packages resets alternative binaries to auto

Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive queens series:
  Fix Released
Status in Ubuntu Cloud Archive stein series:
  Fix Released
Status in Ubuntu Cloud Archive train series:
  Fix Released
Status in openvswitch package in Ubuntu:
  Fix Released
Status in openvswitch source package in Bionic:
  Fix Released
Status in openvswitch source package in Disco:
  Won't Fix
Status in openvswitch source package in Eoan:
  Fix Released

Bug description:
  [Impact]
  Package upgrades on installations using the dpdk binary will be automatically switched back to the non-dpdk binary on upgrade.

  This will break all configured networking within openvswitch.

  [Test Case]
  sudo apt install openvswitch-switch-dpdk
  sudo update-alternatives --set ovs-vswitchd /usr/lib/openvswitch-switch-dpdk/ovs-vswitchd-dpdk
  sudo update-alternatives --query ovs-vswitchd
  Name: ovs-vswitchd
  Link: /usr/sbin/ovs-vswitchd
  Status: manual
  Best: /usr/lib/openvswitch-switch/ovs-vswitchd
  Value: /usr/lib/openvswitch-switch-dpdk/ovs-vswitchd-dpdk

  Alternative: /usr/lib/openvswitch-switch-dpdk/ovs-vswitchd-dpdk
  Priority: 50

  Alternative: /usr/lib/openvswitch-switch/ovs-vswitchd
  Priority: 100

  sudo apt install --reinstall openvswitch-switch-dpdk
  sudo update-alternatives --query ovs-vswitchd
  Name: ovs-vswitchd
  Link: /usr/sbin/ovs-vswitchd
  Status: auto
  Best: /usr/lib/openvswitch-switch/ovs-vswitchd
  Value: /usr/lib/openvswitch-switch/ovs-vswitchd

  Alternative: /usr/lib/openvswitch-switch-dpdk/ovs-vswitchd-dpdk
  Priority: 50

  Alternative: /usr/lib/openvswitch-switch/ovs-vswitchd
  Priority: 100

  [Regression Potential]
  Low - the fix was been in Ubuntu since Eoan and the maintainer script usage of update-alternatives was broken since the -dpdk binary was introducted.

  The main challenge is actually upgrading a -dpdk installation without
  disabling the -dpdk binary with the existing prerm script.

  To avoid this:

  sudo sed -i "/update-alternatives/d" /var/lib/dpkg/info/openvswitch-
  switch-dpdk.prerm

  before completing the package upgrade thus ensuring the -dpdk version
  of the binary never gets removed.

  [Original Bug Report]
  Upgrading and existing openvswitch installation which has been manually configured to use the DPDK alternative binary using:

    sudo update-alternatives --set ovs-vswitchd /usr/lib/openvswitch-
  switch-dpdk/ovs-vswitchd-dpdk

  results in the ovs-vswitchd being reset back to 'auto':

  Setting up openvswitch-switch (2.11.0-0ubuntu2~cloud0) ...
  update-alternatives: using /usr/lib/openvswitch-switch/ovs-vswitchd to provide /usr/sbin/ovs-vswitchd (ovs-vswitchd) in auto mode

  The prerm maintainer scripts always remove the alternatives, which
  purges any manual setting done of the binaries.

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