Xen devel - Dec 2006 - bug in default interface number computation

Hello.

The network-bridge script tries to automatically find the default
network interface number with the following ligne:
vifnum=${vifnum:-$(ip route list | awk ''/^default / { print $NF
}'' | sed
''s/^[^0-9]*//'')}

However, this fails on mandriva, because the parsed line is:
default via 193.55.250.126 dev eth0  metric 10

This causes many troubles, such as:
http://article.gmane.org/gmane.comp.emulators.xen.user/17846

A simple solution is to change the position-based parsing to something
more robust:
vifnum=${vifnum:-$(ip route list 0.0.0.0/0 | sed ''s/.*dev
[^0-9]\+\([0-9]\+\).*$/\1/'')}

This is also more robust against default interfaces that would be named
otherwise as dev[0-9].

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