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#! /bin/sh
# Script to bring a network (tap) device for qemu up.
# The idea is to add the tap device to the same bridge
# as we have default routing to.
set -x
# in order to be able to find brctl
PATH=$PATH:/sbin:/usr/sbin
ip=$(which ip)
if [ -n "$ip" ]; then
ip link set "$1" up
else
brctl=$(which brctl)
if [ ! "$ip" -o ! "$brctl" ]; then
echo "W: $0: not doing any bridge processing: neither ip nor brctl utility not found" >&2
exit 0
fi
ifconfig "$1" 0.0.0.0 up
fi
switch=$(ip route ls | \
awk '/^default / {
for(i=0;i<NF;i++) { if ($i == "dev") { print $(i+1); next; } }
}'
)
# only add the interface to default-route bridge if we
# have such interface (with default route) and if that
# interface is actually a bridge.
# It is possible to have several default routes too
for br in $switch; do
if [ -d /sys/class/net/$br/bridge/. ]; then
if [ -n "$ip" ]; then
ip link set "$1" master "$br"
else
brctl addif $br "$1"
fi
exit # exit with status of the previous command
fi
done
echo "W: $0: no bridge for guest interface found" >&2
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