Bug#662868: debian-edu-config: Obsolete generator for shutdown-at-night cause wakeonlan to fail

[Petter Reinholdtsen <pere@hungry.com>]

Package: debian-edu-config
Version: 1.452

The wakeonlan feature for shutdown-at-night is not working in
Skolelinux/Squeeze.  This means machines turned off automatically at
night have to be manually turned on if nvram-wakeup do not work.

I discovered emails like this sent to root on a Main Server:

  From: root@postoffice.intern (Cron Daemon)
  To: root@postoffice.intern
  Subject: Cron <root@tjener> test -x
    /usr/lib/shutdown-at-night/wakeupclients &&
    /usr/lib/shutdown-at-night/wakeupclients

  ICMP Host Unreachable from 10.0.2.2 for ICMP Echo sent to
    delltest.intern (10.0.16.20)
  ICMP Host Unreachable from 10.0.2.2 for ICMP Echo sent to delltest
    (10.0.16.20)
  ICMP Host Unreachable from 10.0.2.2 for ICMP Echo sent to
    delltest.intern (10.0.16.20)
  Use of uninitialized value in concatenation (.) or string at
    /usr/lib/shutdown-at-night/wakeupclients line 48.
  Use of uninitialized value $hwaddr in concatenation (.) or string at
    /usr/lib/shutdown-at-night/wakeupclients line 61.
  Use of uninitialized value $hwaddrs{"delltest.intern"} in
    concatenation (.) or string at
    /usr/lib/shutdown-at-night/wakeupclients line 48.
  Use of uninitialized value $hwaddr in concatenation (.) or string at
    /usr/lib/shutdown-at-night/wakeupclients line 61.

I tracked this down to /etc/shutdown-at-night/clients-generator, which
give this output on my test installation:

  root@tjener:~# /etc/shutdown-at-night/clients-generator
  delltest
  delltest.intern
  root@tjener:~#

But /usr/lib/shutdown-at-night/wakeupclients now expect it to include
lines with hostname and MAC address separated by space, and thus fail
with the messages listed above.  The MAC address is needed for wakeonlan
to work.

I guess the fix is to rewrite the generator to look up all hosts in the
shutdown-at-night-hosts netgroup in the sitesummary database and output
the MAC address found there.
-- 
Happy hacking
Petter Reinholdtsen