[Bug 1855092] Re: [SRU] Please set MOTD_SHOWN=pam when MOTD was shown

[Balint Reczey]

** Patch added: "0001-pam_motd-Export-MOTD_SHOWN-pam-after-showing-MOTD.patch"
   https://bugs.launchpad.net/ubuntu/+source/pam/+bug/1855092/+attachment/5309779/+files/0001-pam_motd-Export-MOTD_SHOWN-pam-after-showing-MOTD.patch

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https://bugs.launchpad.net/bugs/1855092

Title:
  [SRU] Please set MOTD_SHOWN=pam when MOTD was shown

Status in pam package in Ubuntu:
  In Progress

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 in update-motd is creating a snippet in /etc/profile.d which shows MOTD, but only if UPDATE_MOTD is not set, to avoid printing MOTD twice.

  [Test Case]

   * Log in to the system, where PAM prints the MOTD.
   * After seeing the MOTD observe MOTD_SHOWN set:
     $ echo $MOTD_SHOWN
     pam
     $

  [Regression Potential]

   * The fix is simple thus i is unlikely to see any regression due to bad implementation.
   * The newly set environment variable may interact with existing software, but this variable seems to be not used:
   https://codesearch.debian.net/search?q=MOTD_SHOWN&literal=1

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