This is a bug in the /etc/pam.d/login configuration, which has:
session optional pam_motd.so motd=/run/motd.dynamic noupdate
session optional pam_motd.so
This tells login to display the dynamic motd /without updating it/, and
then to call pam_motd again for the static motd... and updating the
dynamic file. So the motd displayed will always be one run out of date.
The ssh package has this the correct way around:
session optional pam_motd.so motd=/run/motd.dynamic
session optional pam_motd.so noupdate
** Package changed: pam (Ubuntu) => shadow (Ubuntu)
** Changed in: shadow (Ubuntu)
Status: Confirmed => Triaged
** Changed in: shadow (Ubuntu)
Assignee: (unassigned) => Colin Watson (cjwatson)
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https://bugs.launchpad.net/bugs/1368864
Title:
old motd is displayed on login
Status in “shadow” package in Ubuntu:
Triaged
Bug description:
On Trusty, during login, the motd displayed is from the cache file
/run/motd.dynamic. After being displayed, the scripts from /etc
/update-motd.d are run to refresh /run/motd.dynamic. This behavior of
displaying the cache first is not very convenient and didn't happen on
Precise. This is also does not match the documentation (man 5 update-
motd) nor the users' expectations.
Steps to reproduce:
$ cat << "EOF" | sudo tee /etc/update-motd.d/60-test
#!/bin/sh
printf "motd from: $(date +%T)\n"
EOF
$ sudo chmod +x /etc/update-motd.d/60-test
$ echo 'echo "real time: $(date +%T)";exit' | ssh -T localhost
Welcome to Ubuntu 14.04.1 LTS (GNU/Linux 3.13.0-35-generic x86_64)
* Documentation: https://help.ubuntu.com/
motd from: 6:05:43
real time: 12:36:14
The above is just an example of how old/stale the output can be.
More details:
$ lsb_release -rd
Description: Ubuntu 14.04.1 LTS
Release: 14.04
$ apt-cache policy libpam-modules
libpam-modules:
Installed: 1.1.8-1ubuntu2
Candidate: 1.1.8-1ubuntu2
Version table:
*** 1.1.8-1ubuntu2 0
500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
100 /var/lib/dpkg/status
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: libpam-modules 1.1.8-1ubuntu2
ProcVersionSignature: Ubuntu 3.13.0-36.63-generic 3.13.11.6
Uname: Linux 3.13.0-36-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.4
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Sep 12 12:22:09 2014
InstallationDate: Installed on 2014-01-26 (228 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140124)
SourcePackage: pam
UpgradeStatus: No upgrade log present (probably fresh install)
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