/usr/bin/qemu-ifdown is in qemu-common 1.0+noroms-0ubuntu13.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | #!/bin/sh
# NOTE: This script is intended to run in conjunction with qemu-ifup
# which uses the same logic to find your bridge/switch
nic=$1
if [ -f /etc/default/qemu-kvm ]; then
. /etc/default/qemu-kvm
fi
if [ -z "$TAPBR" ]; then
switch=$(ip route list | awk '/^default / { print $5 }')
if [ ! -d "/sys/class/net/${switch}/bridge" ]; then
switch=virbr0
fi
else
switch=$TAPBR
fi
brctl delif $switch $nic
ifconfig $nic 0.0.0.0 down
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