#!/bin/sh
# postinst script for ifupdown2
#
# see: dh_installdeb(1)

set -e

# summary of how this script can be called:
#        * <postinst> `configure' <most-recently-configured-version>
#        * <old-postinst> `abort-upgrade' <new version>
#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
#          <new-version>
#        * <postinst> `abort-remove'
#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
#          <failed-install-package> <version> `removing'
#          <conflicting-package> <version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package

process_udev()
{
    # override default udev bridge and hotplug rules because they interfere with
    # networking init script
    udev_user_rulesdir=/etc/udev/rules.d/
    udev_sys_rulesdir=/lib/udev/rules.d/
    if [ -e $udev_user_rulesdir ]; then
        udev_ifupdown2_overrides="80-networking.rules
        60-bridge-network-interface.rules"
        for u in ${udev_ifupdown2_overrides}
        do
            if [ -e ${udev_sys_rulesdir}/$u -a ! -e ${udev_user_rulesdir}/$u ]; then
                (cd ${udev_user_rulesdir} && ln -sf /dev/null $u)
            fi
        done
    fi
}

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

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

case "$1" in
    configure)

        # work around to rename the existing dhclient6 lease file containing a space
        for filename in `find /var/lib/dhcp/ -name "dhclient.*.leases "`
        do
            if [ -f "$filename " ];
            then
                interface_name=`echo $filename | cut -d'.' -f2,3,4,5`
                mv "$filename " /var/lib/dhcp/dhclient6.$interface_name
            fi
        done

        # Generic stuff done on all configurations
        if [ -f /etc/network/interfaces ] ; then
            if ! grep -q -E "^[[:space:]]*iface[[:space:]]+l[o0]([[:space:]]+inet([[:space:]]+loopback)?)?[[:space:]]*$" /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

        process_udev
        ;;

  purge)
    ;;
esac

#DEBHELPER#

exit 0