[Bug 1866124] Re: ps -eo lxc no longer shows a task's lxc container

[Forest]

The top command's LXC column (not shown by default, but can be enabled
through the 'f' menu) also shows a - for all processes, including those
that belong to containers.

My containers are unprivileged, in case that matters.

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https://bugs.launchpad.net/bugs/1866124

Title:
  ps -eo lxc no longer shows a task's lxc container

Status in lxc package in Ubuntu:
  New
Status in procps package in Ubuntu:
  New

Bug description:
  When I use the ps command's "lxc" format specifier, for example:

  ps -eo pid,lxc,command

  The second output column is supposed to show "the name of the lxc
  container within which a task is running.  If a process is not running
  inside a container, a dash ('-') will be shown." [1]

  This worked fine until I upgraded from ubuntu 19.04 to 19.10, which
  brought me from lxc 3.03 to 3.04.  Now, that column always contains a
  dash instead of the container name, even for processes that are
  running inside a container.  The "lxc" format specifier seems to be
  broken now.

  [1]
  https://manpages.ubuntu.com/manpages/eoan/man1/ps.1.html#standard%20format%20specifiers

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