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

[Forest]

Public bug reported:

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

** Affects: lxc (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: procps (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: lxc (Ubuntu)
   Importance: Undecided
       Status: New

** Description changed:

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

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to procps in Ubuntu.
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

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1866124/+subscriptions