#!/bin/sh -e
#
# 2012-2018 Steven Armstrong (steven-cdist at armstrong.cc)
#
# This file is part of cdist.
#
# cdist 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 3 of the License, or
# (at your option) any later version.
#
# cdist 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 cdist. If not, see <http://www.gnu.org/licenses/>.
#

__package ifupdown
# Use cumulus ifupdown2 instead of ifupown and ifenslave
# ifupdown2 is currently not compatible with network-wait-online.
#__package ifupdown \
#   --name ifupdown2

type_files="$__type/files/debian"
mkdir "$__object/files"
interface_filename="${__object_id}.conf"

(
cat << DONE
# Created by cdist ${__type##*/}
# Do not change. Changes will be overwritten.
#

DONE

if [ -f "$__object/parameter/comment" ]; then
    awk '{ print "# "$0 }' < "$__object/parameter/comment"
fi

if [ -f "$__object/parameter/onboot" ]; then
   # shellcheck disable=SC2154
   printf "auto %s\n" "$name"
elif [ -f "$__object/parameter/hotplug" ]; then
   # shellcheck disable=SC2154
   printf "allow-hotplug %s\n" "$name"
fi

ignored_parameters="linkdelay"
manually_handled_parameters="name comment extra-config state method onboot hotplug nodns noroute no-network-wait-online symmetric-routing bond-slaves"
# shellcheck disable=SC2154
case "$method" in
   dhcp)
      printf "iface %s inet %s\n" "$name" "$method"
      ignored_parameters="$ignored_parameters address broadcast gateway netmask"
   ;;
   static|manual)
      printf "iface %s inet %s\n" "$name" "$method"
   ;;
   *)
      echo "Unsupported value for parameter --method. Got '$method'. See man page for supported values." >&2
      exit 1
   ;;
esac

for param in "$__object"/parameter/*; do
   if echo "$ignored_parameters" | grep -w -q "$param"; then
      continue
   fi
   if echo "$manually_handled_parameters" | grep -w -q "$param"; then
      continue
   fi

   if [ -f "$type_files/name-map" ]; then
      key="$(awk -v param="$param" '{ if ($1 == param) {print $2;} else { print param;} }' "$type_files/name-map")"
   else
      key="$param"
   fi
   printf "  %s %s\n" "$key" "$(cat "$__object/parameter/$param")"
done

if [ -f "$__object/parameter/bond-mode" ] || [ -f "$__object/parameter/bond-primary" ]; then
   # Note: ifenslave is not needed when using ifupdown2
   # install package required for bonding
   __package ifenslave
   if [ -f "$__object/parameter/bond-slaves" ]; then
      printf '  bond-slaves %s\n' "$(cat "$__object/parameter/bond-slaves")"
   else
      # need this or the slave tries to bring the master up, but the master hangs waiting for a slave
      printf '  bond-slaves none\n'
   fi
fi

if [ -f "$__object/parameter/no-network-wait-online" ]; then
   # Do not consider this interface in network-wait-online.service
   printf '  no-network-wait-online yes\n'
fi

if [ -f "$__object/parameter/symmetric-routing" ]; then
   # Deploy scripts that implement the feature ...
   __file /sbin/symmetric-routing \
      --owner root --group root --mode 0755 \
      --source "$__type/files/symmetric-routing"
   require="__package/ifupdown __file/sbin/symmetric-routing" \
      __file /etc/network/if-up.d/symmetric-routing \
         --owner root --group root --mode 0755 \
         --source "$__type/files/debian/ifupdown-symmetric-routing"
   require="__package/ifupdown __file/etc/network/if-up.d/symmetric-routing" \
      __link /etc/network/if-down.d/symmetric-routing \
         --type symbolic \
         --source ../if-up.d/symmetric-routing
   # ... then enable it in interface stanza file.
   printf '  symmetric-routing yes\n'
fi

# shellcheck disable=SC2154
if [ -n "$vlan" ] && [ -n "$device" ]; then
   # Explicit parent interface for vlans
   printf '  vlan-raw-device %s\n' "$device"
fi

if [ -f "$__object/parameter/extra-config" ]; then
   extra_config="$(cat "$__object/parameter/extra-config")"
   if [ "$extra_config" = "-" ]; then
      extra_config="$__object/stdin"
   fi
   awk '{print "  " $0}' "$extra_config"
fi

) >> "$__object/files/$interface_filename"

__directory /etc/network \
   --state present \
   --owner root \
   --group root \
   --mode 755

require="__directory/etc/network" \
   __directory /etc/network/interfaces.d \
      --state present \
      --owner root \
      --group root \
      --mode 755

require="__directory/etc/network" \
   __file /etc/network/interfaces \
      --source "$type_files/interfaces" \
      --owner root \
      --group root \
      --mode 644

# shellcheck disable=SC2154
require="__file/etc/network/interfaces __directory/etc/network/interfaces.d" \
   __file "/etc/network/interfaces.d/$interface_filename" \
      --owner root \
      --group root \
      --mode 644 \
      --source "$__object/files/$interface_filename" \
      --state "$state"


if [ "$method" = "dhcp" ] && [ -f "$__object/parameter/noroute" ]; then
(
cat << DONE
# Created by cdist ${__type##*/}
# Do not change. Changes will be overwritten.
#

if [ "\$interface" = "$name" ]; then

case "\$reason" in
   BOUND|RENEW|REBIND|REBOOT)
      # prevent default gateway to be set by this interface
      unset new_routers
   ;;
esac

fi
DONE
) | \
__file "/etc/dhcp/dhclient-enter-hooks.d/cdist-__network_interface-${name}-noroute" \
   --owner root \
   --group root \
   --mode 644 \
   --source - \
   --state "$state"
fi # end noroute

if [ "$method" = "dhcp" ] && [ -f "$__object/parameter/nodns" ]; then
(
cat << DONE
# Created by cdist ${__type##*/}
# Do not change. Changes will be overwritten.
#

if [ "\$interface" = "$name" ]; then

# Prevent /etc/resolv.conf from being changed by this interface
# by overriding the default 'make_resolv_conf' function.
make_resolv_conf(){
   :
}

fi
DONE
) | \
__file "/etc/dhcp/dhclient-enter-hooks.d/cdist-__network_interface-${name}-nodns" \
   --owner root \
   --group root \
   --mode 644 \
   --source - \
   --state "$state"
fi # end nodns


os=$(cat "$__global/explorer/os")
if [ "$os" = "ubuntu" ]; then
   # workaround the bloody upstart race conditions
   # by deploying a script that delays the emission of the net-device-up
   # signal until the interface is really up and configured.
   #script_name="00000-wait-for-ip"
   #__file "/etc/network/if-up.d/$script_name" \
   #   --owner root --group root --mode 755 \
   #   --source "$type_files/$script_name"

   # Deal with systemd network-online.target race conditions
   require="__package/ifupdown" \
      __file /etc/network/if-pre-up.d/network-online \
         --owner root --group root --mode 0755 \
         --source "$__type/files/debian/network-online"
   require="__file/etc/network/if-pre-up.d/network-online" \
      __link /etc/network/if-up.d/network-online \
         --type symbolic \
         --source ../if-pre-up.d/network-online
fi