#! /bin/bash

# modified from upstream fai example
error=0; trap 'error=$(($?>$error?$?:$error))' ERR # save maximum error code

newnicnames() {

    # determine predictable network names only for stretch and above

    [ $do_init_tasks -eq 0 ] && return

    ver=$($ROOTCMD dpkg-query --showformat='${Version}' --show udev)
    if dpkg --compare-versions $ver lt 220-7; then
	return
    fi

    [ -z $NIC1 ] && return

    fields="ID_NET_NAME_FROM_DATABASE ID_NET_NAME_ONBOARD ID_NET_NAME_SLOT ID_NET_NAME_PATH"
    for field in $fields; do
	name=$(udevadm info /sys/class/net/$NIC1 | sed -rn "s/^E: $field=(.+)/\1/p")
	if [[ $name ]]; then
	    NIC1=$name
	    break
	fi
    done
    if ifclass VM; then
        NIC1=ens3
        return
    fi
    if [[ ! $name ]]; then
	echo "$0: error: could not find systemd predictable network name. Using $NIC1."
    fi
}

newnicnames
CIDR=$(ip -o -f inet addr show $NIC1 | awk '{print $4}')
if ifclass DHCPC && [ $FAI_ACTION = "install" -o $FAI_ACTION = "dirinstall" ]; then

    if ifclass VM; then

        # note, this condition would apply to the elif below too,
        # but I don't specify a static ip in fai, so not bothering
        cat > $target/etc/network/interfaces <<-EOF
	# generated by FAI
	auto lo $NIC1
	iface lo inet loopback
	iface $NIC1 inet dhcp
EOF
    else
        cat > $target/etc/network/interfaces <<-EOF
        # generated by FAI
        auto lo br0
        iface lo inet loopback
        iface $NIC1 inet manual
        # make a bridge by default so we can have bridged vms.
        # Some example I read had stp on, but i don't need stp,
        # and it causes a vm to fail pxe boot, presumably unless
        # you add some delay.
        # http://wiki.libvirt.org/page/PXE_boot_%28or_dhcp%29_on_guest_failed
        iface br0 inet dhcp
          bridge_ports $NIC1
          bridge_stp off
          bridge_maxwait 0
EOF
    fi
elif [ $FAI_ACTION = "install" -o $FAI_ACTION = "dirinstall" ]; then
    [ -n "$CIDR" ] && cat > $target/etc/network/interfaces <<-EOF
	# generated by FAI
	auto lo $NIC1
	iface lo inet loopback
	iface $NIC1 inet static
	  address $CIDR
	  gateway $GATEWAYS
EOF
    [ -n "$NETWORK" ] && echo "localnet $NETWORK" > $target/etc/networks
    if [ ! -L $target/etc/resolv.conf -a -e /etc/resolv.conf ]; then
	cp -p /etc/resolv.conf $target/etc
    fi
fi

# here fcopy is mostly used, when installing a client for running in a
# different subnet than during the installation
fcopy -iM /etc/resolv.conf
fcopy -iM /etc/network/interfaces /etc/networks

exit $error