OpenStack in a snap!
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# Oneshot daemon which creates a networking bridge.
# Creates br-ex, and sets up an ip address for it. We put this in a
# oneshot so that the ip address persists after reboot, without
# needing to add networking entries to the host system. (We want this
# to work well when we turn off classic confinement.)
set -ex
extcidr=$(snapctl get extcidr)
# Create external integration bridge
ovs-vsctl --retry --may-exist add-br br-ex
# Configure br-ex
ip address add $extcidr dev br-ex || :
ip link set br-ex up || :
sudo iptables -w -t nat -A POSTROUTING -s $extcidr ! -d $extcidr -j MASQUERADE
exit 0