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

[Balint Reczey]

Public bug reported:

[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

** Affects: pam (Ubuntu)
     Importance: Undecided
     Assignee: Balint Reczey (rbalint)
         Status: In Progress

** Changed in: pam (Ubuntu)
     Assignee: (unassigned) => Balint Reczey (rbalint)

** Changed in: pam (Ubuntu)
       Status: New => In Progress

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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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