On Sat, 8 May 2010, Steve Langasek wrote:
> On Wed, May 05, 2010 at 06:38:49PM +0200, Julian Andres Klode wrote:
> > > On Wed, May 05, 2010 at 02:23:16AM +0200, Jean-Christophe Dubacq wrote:
> > > > This one was a bit hard to track down. After a while, my /etc/motd
> > > > would be reduced to one empty line or info about packages updates.
>
> > > > It happens that pam_motd executes /etc/update-motd.d if it exists (with
> > > > run-parts) but nothing in this directory rebuilds the standard motd.
> > I did not know this.
>
> > > > This could be a bug in update-notifier-common, or in pam (not providing
> > > > a small file such as:
> > > > ebene:~$ cat /etc/update-motd.d/00-header
> > > > #!/bin/sh
> > > > uname -snrvm
> > > > [ -f /etc/motd.tail ] && cat /etc/motd.tail
>
> > > Yes, I think this is a bug in update-notifier-common for shipping this
> > > file
> > > in Debian without having an appropriate versioned dep on something that
> > > builds the main part of the motd. Reassigning.
> > Is there something that builds it?
>
> In Debian, I don't think there is yet (and if not, update-notifier-common
> should avoid shipping this code in Debian). In Ubuntu,
> /etc/update-motd.d/00-header is provided as part of base-files, since that's
> the package which owns /etc/motd historically.
In Debian, the file /etc/motd is created the very first time
base-files is installed (by debootstrap) in this way:
if [ "$1" = "configure" ] && [ "$2" = "" ]; then
[...]
install_from_default /usr/share/base-files/motd /etc/motd
Also, on upgrades, base-files tries to upgrade the file in this way:
if [ "$1" = "configure" ] && [ "$2" != "" ]; then
if [ -f /etc/motd ]; then
oldmd=`awk 'NR > 2' /etc/motd | md5sum | awk '{print $1}'`
newmd=`awk 'NR > 2' /usr/share/base-files/motd | md5sum | awk '{print $1}'`
if [ "$oldmd" != "$newmd" ]; then
if grep -q "$oldmd" /usr/share/base-files/motd.md5sums; then
awk 'NR <= 2' /etc/motd > /etc/motd.new
awk 'NR > 2' /usr/share/base-files/motd >> /etc/motd.new
mv /etc/motd /etc/motd.old
mv /etc/motd.new /etc/motd
fi
fi
fi
fi
If anybody is going to break this I will appreciate that it could be
discussed first, at least.
(I was warned about this bug by a neutral observer).
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