#!/bin/sh -e

remove_options_file() {
  [ -z "$2" -o ! -e /etc/network/options ] || return 0
  if dpkg --compare-versions "$2" ge "4.22-1"; then
    return 0
  fi

  # on which conditions should /etc/network/options be silently removed?
}

update_hosts_file() {
  if [ -f /etc/hosts ] && ! grep -qE "^::1[[:space:]]" /etc/hosts; then
    cat >>/etc/hosts <<-EOF

	::1     localhost ip6-localhost ip6-loopback
	fe00::0 ip6-localnet
	ff00::0 ip6-mcastprefix
	ff02::1 ip6-allnodes
	ff02::2 ip6-allrouters
EOF
  fi
}

update_rc() {
  if dpkg --compare-versions "$2" lt "4.35ubuntu2~boot1"; then
    update-rc.d -f networking remove >/dev/null
  fi
  update-rc.d networking start 35 0 6 . > /dev/null
}

create_networks() {
  if [ -e /etc/networks ]; then return 0; fi

  cat >> /etc/networks <<-EOF
	default		0.0.0.0
	loopback	127.0.0.0
	link-local	169.254.0.0
	
EOF
}

case "$1" in
    configure)
    #remove_options_file "$@"
    update_hosts_file
    update_rc
    create_networks
    ;;

    abort-upgrade|abort-remove|abort-deconfigure)
    ;;

    *)
    echo "postinst called with unknown argument '$1'" >&2
    exit 1
    ;;
esac