The network-bridge script is fragile because of how grep is used. As
one example, if I already have "xenbridge", I can't create "xenbr". 
(It's actually worse than that, because it's even grepping the header
output by brctl show.)
Assuming dom0 is on Linux with /sys mounted (is that a safe
assumption?) we can check for the existence of a bridge, and check if a
device is on the bridge, by looking in /sys. The attached patch does
that.
If that's not a safe assumption, at least add "-w" to the two instances
of grep. Not perfect, but better.

Attachment: xen-network-bridge.diff
Description: Binary data

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