[Bug 1853013] Re: libvirtd looks for ebtables in the wrong location

[Christian Ehrhardt ]

FYI: this is correct for libvirt in the respective releases.

$ lxc exec f bash
root at f:~# which ebtables
/usr/sbin/ebtables
root at f:~# exit

$ lxc exec b bash
root at b:~# which ebtables
/sbin/ebtables

But since Train is Focals libvirt on Bionic the path needs to be adapted
on the backport.

It comes down to this commit [1] which is correct for Focal and Debian, but not Bionic.
Fortunately it also provides you the ENV-Vars to override the paths as needed.

TBH I have done so on some other Bionic backport that I maintain and I'm pretty sure I IRC pinged someone of the openstack Team on this. This is true since:
$ git tag --contains 76e2cb71d4dd77d66424ad03795c1ade23b747ee
debian/5.0.0-2
debian/5.0.0-3
debian/5.0.0-4
debian/5.1.0-1
debian/5.2.0-1
debian/5.2.0-2
debian/5.6.0-1
debian/5.6.0-2

Therefore it applies to two UCA Trains and Stein as Rocky still was
based on 5.0.0-1.

[1]: https://salsa.debian.org/libvirt-
team/libvirt/commit/76e2cb71d4dd77d66424ad03795c1ade23b747ee

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https://bugs.launchpad.net/bugs/1853013

Title:
  libvirtd looks for ebtables in the wrong location

Status in Ubuntu Cloud Archive:
  New

Bug description:
  Using Train packages on a Bionic system makes libvirt unable to setup
  a network, as it looks for ebtables at /usr/sbin/ebtables, while the
  binary is installed as /sbin/ebtables. This is the logged error:

  libvirtd[4230]: libvirt version: 5.4.0, package: 0ubuntu5~cloud0 (Openstack Ubuntu Testing Bot <openstack-testing-bot at ubuntu.com> Thu, 05 Sep 2019 11:37:48 +0000)
  libvirtd[4230]: hostname: swirlix42
  libvirtd[4230]: direct firewall backend requested, but /usr/sbin/ebtables is not available: No such file or directory
  libvirtd[4230]: internal error: Failed to initialize a valid firewall backend
  libvirtd[4230]: internal error: Failed to initialize a valid firewall backend
  [...]

  $ ls -l /usr/sbin/ebtables
  ls: cannot access '/usr/sbin/ebtables': No such file or directory
  $ ls -l /sbin/ebtables
  -rwxr-xr-x 1 root root 10088 Jun 28  2018 /sbin/ebtables

  
  $ dpkg -l | grep libvirt
  ii  libvirt-bin                           4.0.0-1ubuntu8.13                      arm64        programs for the libvirt library
  ii  libvirt-clients                       5.4.0-0ubuntu5~cloud0                  arm64        Programs for the libvirt library
  ii  libvirt-daemon                        5.4.0-0ubuntu5~cloud0                  arm64        Virtualization daemon
  ii  libvirt-daemon-driver-storage-rbd     5.4.0-0ubuntu5~cloud0                  arm64        Virtualization daemon RBD storage driver
  ii  libvirt-daemon-system                 5.4.0-0ubuntu5~cloud0                  arm64        Libvirt daemon configuration files
  ii  libvirt0:arm64                        5.4.0-0ubuntu5~cloud0                  arm64        library for interfacing with different virtualization systems
  ii  python-libvirt                        5.0.0-1~cloud0                         arm64        libvirt Python bindings
  ii  uvtool-libvirt                        0~git140-0ubuntu1                      all          Library and tools for using Ubuntu Cloud Images with libvirt

  
  $ dpkg -l | grep ebtables
  ii  ebtables                              2.0.10.4-3.5ubuntu2.18.04.3            arm64        Ethernet bridge frame table administration

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