#!/bin/sh -e

if [ "$1" = "configure" ] && [ -e /usr/share/debconf/confmodule ]; then
    . /usr/share/debconf/confmodule

    # Get answers to questions
    db_get ifupdown/convert-interfaces;    ATTEMPT_CONVERSION="$RET"
elif [ "$1" = "configure" ] && dpkg --compare-versions "$2" le "0.6.2pr-3"
then
    echo
    cat <<EOF
The format of /etc/network/interfaces has had a minor but incompatible
change made between version 0.5.x and 0.6.x of ifupdown. It is however
possible to automatically convert from the old format to the new in
most cases.
EOF
    echo
    echo "Should I attempt to automatically update /etc/network/interfaces? [Y/n] "
    read upg
    if [ "$upg" = "N" -o "$upg" = "n" ]; then
        ATTEMPT_CONVERSION="false"
    else
        ATTEMPT_CONVERSION="true"
    fi
fi

if [ "$1" = "configure" ] &&
        dpkg --compare-versions "$2" le "0.6.2pr-3" &&
        [ "$ATTEMPT_CONVERSION" = "true" ]
then
    echo
    echo -n "Automatically converting /etc/network/interfaces"
    (
        cd /etc/network;
        if /usr/share/ifupdown/upgrade-from-0.5.x.pl \
                < interfaces > interfaces.dpkg-new 2>/dev/null
        then
            echo " succeeded."
            mv interfaces interfaces.dpkg-old
            mv interfaces.dpkg-new interfaces
            echo "Old interfaces file saved as interfaces.dpkg-old."
        else
            echo " failed."
            echo
            echo "If you wish to reattempt the conversion you may run"
            echo "    cat /etc/network/interfaces |"
            echo "         /usr/share/ifupdown/upgrade-from-0.5.x.pl"
            echo
	    if [ ! -e /usr/share/debconf/confmodule ]; then
	        echo -n "Press enter to continue:"
	        read blah
	    fi # debconf users can't be prompted. stupid program.
        fi
    )
fi

if [ "$1" = configure -a -e /var/run/ifupdown.state -a \
	! -e /etc/network/ifstate ]
then
	mv /var/run/ifupdown.state /etc/network/ifstate
fi

if [ "$1" = "configure" ] \
     && dpkg --compare-versions "$2" le "0.6.4-4.1" \
     && [ -f /etc/network/ifstate ] \
     && [ -x /sbin/dhclient ]
then
    # for every[1] active ifupdown-controlled dhclient interface, copy
    # /var/run/dhclient.pid, so that the new ifdown is able to kill
    # dhclient.
    #
    # [1] old version has a bug with more than one DHCP iface anyway,
    #     just we don't know which one made it if there are several.
    sed -e 's/^.*=//' /etc/network/ifstate |
        while read iface
        do
            # handle \<newline>-continued lines
            sed -e '/^[[:space:]]*#/b;:g /\\$/{N;s/\\\n//;bg;}' /etc/network/interfaces |\
                if grep -e "^[[:space:]]*iface[[:space:]]*\\b${iface}\\b[[:space:]]*.*\\bdhcp\\b.*" >/dev/null 2>&1 \
                        && [ -f "/var/run/dhclient.pid" ] \
                        && [ ! -f "/var/run/dhclient.${iface}.pid" ]
                then
                    # copy original file.  If dhclient was started
                    # manually, one can still use dhclient.pid, if started
                    # by ifupdown, the new ifupdown can take it down with 
                    # dhclient.${iface}.pid.  Obsolete files are removed during
                    # next boot (bootmisc.sh).
                    cp /var/run/dhclient.pid "/var/run/dhclient.${iface}.pid"
                fi
        done
fi


update-rc.d ifupdown start 39 S . >/dev/null

##DEBHELPER##