[Bug 1855089] Re: Please show MOTD in containers' shell started without PAM printing MOTD

[Balint Reczey]

Verified with 3.6-0ubuntu1.19.10.1 :

root at ee-motd-verify:~# apt install show-motd
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following package was automatically installed and is no longer required:
  libfreetype6
Use 'apt autoremove' to remove it.
The following NEW packages will be installed:
  show-motd
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 2304 B of archives.
After this operation, 15.4 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu eoan-proposed/main amd64 show-motd all 3.6-0ubuntu1.19.10.1 [2304 B]
Fetched 2304 B in 0s (18.4 kB/s)    
Selecting previously unselected package show-motd.
(Reading database ... 30302 files and directories currently installed.)
Preparing to unpack .../show-motd_3.6-0ubuntu1.19.10.1_all.deb ...
Unpacking show-motd (3.6-0ubuntu1.19.10.1) ...
Setting up show-motd (3.6-0ubuntu1.19.10.1) ...
root at ee-motd-verify:~# logout
rbalint at yogi:~$ lxc shell ee-motd-verify 
Welcome to Ubuntu 19.10 (GNU/Linux 5.0.0-37-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

  System information as of Wed Dec 18 13:44:08 UTC 2019

  System load:    2.7       Processes:           28
  Usage of /home: unknown   Users logged in:     0
  Memory usage:   0%        IP address for eth0: 10.84.73.58
  Swap usage:     100%


0 updates can be installed immediately.
0 of these updates are security updates.


This message is shown once once a day. To disable it please create the
/root/.hushlogin file.
root at ee-motd-verify:~# logout
rbalint at yogi:~$ lxc shell ee-motd-verify 
root at ee-motd-verify:~# 


** Tags removed: verification-needed verification-needed-eoan
** Tags added: verification-done verification-done-eoan

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https://bugs.launchpad.net/bugs/1855089

Title:
  Please show MOTD in containers' shell started without PAM printing
  MOTD

Status in update-motd:
  New
Status in update-motd package in Ubuntu:
  Fix Released
Status in update-motd source package in Eoan:
  Fix Committed

Bug description:
  [Impact]

    * Users of containers may never see the MOTD of the container if they are always to the container's shell without PAM being involved.
    * MOTD contains important information about the system's health including the security updates to be installed thus it is desired to show MOTD in container shells, too.
    * The fix is creating a snippet in /etc/profile.d which shows, but not necessarily updates MOTD once a day.

  [Test Case]

   * Install show-motd in an LXC container.
   * Observe MOTD shown when starting the container shell with
     $ lxc shell <container name>

  [Regression Potential]

   * The new functionality is added in a new package, shown-motd, thus users of update-motd should not observe any regression.
   * The change in update-motd is adding the --show-only optional option. Both the new and old code patch is exercised in autopkgtest and should be safe.

  [Other Info]

   * The fix relies on PAM setting MOTD_SHOWN=pam to avoid printing MOTD
  twice.

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