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|
#!/bin/sh -e
#
# Script used to configure vRouter interface
configVRouter()
{
cat juju-header
echo "auto $1"
if [ -e "$2" ]; then
cat "$2"
else
echo "iface $1 inet manual"
fi
printf "\n%s\n" "auto vhost0"
if [ -e "$3" ]; then
cat "$3"
else
echo "iface vhost0 inet dhcp"
fi
cat <<-EOF
pre-up ip link add address \$(cat /sys/class/net/$1/address) type vhost
pre-up vif --add $1 --mac \$(cat /sys/class/net/$1/address) --vrf 0 --vhost-phys --type physical
pre-up vif --add vhost0 --mac \$(cat /sys/class/net/$1/address) --vrf 0 --type vhost --xconnect $1
post-down vif --list | awk '/^vif.*OS: vhost0/ {split(\$1, arr, "\\/"); print arr[2];}' | xargs vif --delete
post-down vif --list | awk '/^vif.*OS: $1/ {split(\$1, arr, "\\/"); print arr[2];}' | xargs vif --delete
post-down ip link delete vhost0
EOF
}
ifacedown()
{
for iface; do
# ifdown interface
# if bridge, save list of interfaces
# if bond, save list of slaves
if [ ! -e /sys/class/net/$iface ]; then
continue
fi
[ -d /sys/class/net/$iface/bridge ] && saveIfaces $iface
[ -d /sys/class/net/$iface/bonding ] && saveSlaves $iface
ifdown --force $iface
done
}
ifaceup()
{
for iface; do
# ifup interface
# if bridge, restore list of interfaces
# restore list of slaves if exists (bond)
restoreSlaves $iface
ifup $iface
[ -d /sys/class/net/$iface/bridge ] && restoreIfaces $iface
done
return 0
}
restoreIfaces()
{
if [ -e $TMP/$1.ifaces ]; then
cat $TMP/$1.ifaces | xargs -n 1 brctl addif $1 || true
fi
}
restoreSlaves()
{
if [ -e $TMP/$1.slaves ]; then
cat $TMP/$1.slaves | xargs ifup
fi
}
saveIfaces()
{
if [ -z "$(find /sys/class/net/$1/brif -maxdepth 0 -empty)" ]; then
find /sys/class/net/$1/brif | tail -n +2 | xargs -n 1 basename \
> $TMP/$1.ifaces
fi
}
saveSlaves()
{
if [ -s /sys/class/net/$1/bonding/slaves ]; then
cat /sys/class/net/$1/bonding/slaves | tr " " "\n" \
> $TMP/$1.slaves
fi
}
TMP=$(mktemp -d /tmp/create-vrouter.XXX)
if [ $# -ne 0 ]; then
interface=$1
else
# use default gateway interface
interface=$(route -n | awk '$1 == "0.0.0.0" { print $8 }')
fi
ifacedown $interface vhost0; sleep 5
# add interfaces.d source line to /etc/network/interfaces
if ! grep -q '^[[:blank:]]*source /etc/network/interfaces\.d/\*\.cfg[[:blank:]]*$' \
/etc/network/interfaces; then
printf "\n%s\n" "source /etc/network/interfaces.d/*.cfg" \
>> /etc/network/interfaces
# it's possible for conflicting network config to exist in
# /etc/network/interfaces.d when we start sourcing it
# so disable any config as a precautionary measure
for cfg in /etc/network/interfaces.d/*.cfg; do
[ -e "$cfg" ] || continue
mv "$cfg" "$cfg.save"
done
fi
mkdir -p /etc/network/interfaces.d
for cfg in /etc/network/interfaces /etc/network/interfaces.d/*.cfg \
/etc/network/*.config; do
# for each network interfaces config, extract the config for
# the chosen interface whilst commenting it out in the subsequent
# replacement config
[ -e "$cfg" ] || continue
awk -v interface=$interface -v interface_cfg=$TMP/interface.cfg \
-v vrouter_cfg=$TMP/vrouter.cfg -f vrouter-interfaces.awk "$cfg" \
> $TMP/interfaces.cfg
if ! diff $TMP/interfaces.cfg "$cfg" > /dev/null; then
# create backup
mv "$cfg" "$cfg.save"
# substitute replacement config for original config
cat juju-header $TMP/interfaces.cfg > "$cfg"
fi
done
# use extracted interface config to create new vrouter config
configVRouter $interface $TMP/interface.cfg $TMP/vrouter.cfg \
> /etc/network/interfaces.d/vrouter.cfg
ifaceup $interface vhost0
rm -rf $TMP
|
