#! /bin/bash

# Copyright (C) 2015 GRNET S.A.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.


set -e
. "@commondir@/common.sh"

INTERFACES="$SNF_IMAGE_TARGET/etc/network/interfaces"

networking_opts "$@"

# initialize
if [ "$initialize" = yes ]; then

    if [ -f "$INTERFACES" ]; then
        mv "$INTERFACES" "${INTERFACES}.snf-image-$RANDOM"
    fi

    cat > "$INTERFACES" <<EOF
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# Entries were automatically added by snf-image's ConfigureNetwork task.

# The loopback network interface
auto lo
iface lo inet loopback

EOF

    exit 0
fi

# finalize
if [ "$finalize" = yes ]; then
    exit 0
fi

nic="auto eth${index}\n"
nic+="allow-hotplug eth${index}\n"

if [ "$ipv4" = "dhcp" ]; then
    nic+="iface eth${index} inet dhcp\n"
elif [ "$ipv4" = "static" ]; then
    netmask="$(cidr2mask "${SUBNET##*/}")"
    nic+="iface eth${index} inet static\n"
    nic+="    address $IP\n"
    nic+="    netmask $netmask\n"
    if [ -n "$GATEWAY" ]; then
        nic+="    gateway $GATEWAY\n"
    fi
fi

if [ "$ipv6" = "dhcp" ]; then
    nic+="iface eth${index} inet6 dhcp\n"
elif [ "$ipv6" = "slaac" ]; then
    nic+="iface eth${index} inet6 auto\n"
    nic+="    privext 0\n"
elif [ "$ipv6" = "slaac_dhcp" ]; then
    nic+="iface eth${index} inet6 auto\n"
    nic+="    privext 0\n"
    nic+="    dhcp 1\n"
fi

echo -e "$nic" >> "$INTERFACES"

# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :