#!/bin/sh
set -e

MYNAME="${0##*/}"

report() { echo "${MYNAME}: $*" ; }
report_warn() { report "Warning: $*" >&2 ; }
report_err() { report "Error: $*" >&2 ; }

case "$1" in
    configure)
        # Create /etc/network/run 
        [ -d /run/network ] || mkdir -p /run/network

        # for backward compatibility
        if [ ! -f /etc/network/run ]; then
            ln -sf /run/network /etc/network/run
        fi

        ln -sf /usr/share/python-ifupdown2/generate_interfaces.py /usr/share/doc/python-ifupdown2/examples/generate_interfaces.py

        [ -d /etc/network/if-pre-up.d ] || mkdir -p /etc/network/if-pre-up.d
        [ -d /etc/network/if-up.d ] || mkdir -p /etc/network/if-up.d
        [ -d /etc/network/if-post-up.d ] || mkdir -p /etc/network/if-post-up.d

        [ -d /etc/network/if-pre-down.d ] || mkdir -p /etc/network/if-pre-down.d
        [ -d /etc/network/if-down.d ] || mkdir -p /etc/network/if-down.d
        [ -d /etc/network/if-post-down.d ] || mkdir -p /etc/network/if-post-down.d


        # Generic stuff done on all configurations
        if [ -f /etc/network/interfaces ] ; then
            # TODO: This should be handled with debconf and the script
            # could introduce the line there directly
            if ! grep -q "^[[:space:]]*iface[[:space:]]\+lo0\?[[:space:]]\+inet[[:space:]]\+loopback\>" /etc/network/interfaces ; then
                report_warn "No 'iface lo' definition found in /etc/network/interfaces"
            fi

            if ! grep -q "^[[:space:]]*\(allow-\|\)auto[[:space:]]\+\(.*[[:space:]]\+\|\)lo0\?\([[:space:]]\+\|$\)" /etc/network/interfaces ; then
                report_warn "No 'auto lo' statement found in /etc/network/interfaces"
            fi
        else  # ! -f /etc/network/interfaces
            if [ -z "$2" ]; then
                echo "Creating /etc/network/interfaces."
                echo "# interfaces(5) file used by ifup(8) and ifdown(8)" > /etc/network/interfaces
                echo "auto lo" >> /etc/network/interfaces
                    echo "iface lo inet loopback" >> /etc/network/interfaces
            else
                    report_warn "/etc/network/interfaces does not exist"
            fi
        fi

        [ -e /sbin/ifup ] || ln -s /sbin/ifupdown /sbin/ifup
        [ -e /sbin/ifdown ] || ln -s /sbin/ifupdown /sbin/ifdown
        [ -e /sbin/ifquery ] || ln -s /sbin/ifupdown /sbin/ifquery
        [ -e /sbin/ifreload ] || ln -s /sbin/ifupdown /sbin/ifreload

        (cd /usr/share/man/man8/ && ln -sf /usr/share/man/man8/ifup.8.gz ifdown.8.gz)

        mkdir -p /etc/network/interfaces.d/
        ;;

  purge)
    # Note: We don't remove /etc/network/interfaces
    rm -f /run/network/ifstate
    rm -f /sbin/ifquery
    rm -f /sbin/ifup
    rm -f /sbin/ifdown
    rm -f /usr/share/doc/python-ifupdown2/generate_interfaces.py
    ;;
esac

if [ -x "/etc/init.d/networking" ]; then
    update-rc.d networking start 40 S . start 35 0 6 . >/dev/null || exit $?
fi

#DEBHELPER#