A hook script in "/etc/dhcp3/dhclient-exit-hooks.d/" should be able to
fix this.
As has been mentioned, X might get angry, but you could always check for
a running X before changing the hostname (assuming it's better to have
the wrong hostname than it is to have a non-working X).
Signaling a "no network" error to users could be done with /etc/motd,
/etc/issue and/or xmessage
A slight improvement on the interface guessing might be chasing up the
default gateway:
host $(ifconfig `ip route | awk '/^default/{print $5}'` | sed -rne
's/.*inet addr:(.*)Bcast.*/\1/p') | cut --delim \ --field 5
--
hostname supplied by dhcp server is not used
https://bugs.launchpad.net/bugs/90388
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