#!/bin/sh

set -e

# Prepare to remove a no-longer used conffile
prep_rm_conffile()
{
    PKGNAME="$1"
    CONFFILE="$2"

    if [ -e "$CONFFILE" ]; then
        md5sum="`md5sum \"$CONFFILE\" | sed -e \"s/ .*//\"`"
        old_md5sum="`dpkg-query -W -f='${Conffiles}' $PKGNAME | sed -n -e \"\\\\' $CONFFILE'{s/ obsolete$//;s/.* //p}\"`"
        if [ "$md5sum" != "$old_md5sum" ]; then
            echo "Obsolete conffile $CONFFILE has been modified by you, renaming to .dpkg-bak"
            mv -f "$CONFFILE" "$CONFFILE".dpkg-bak
        else
            mv -f "$CONFFILE" "$CONFFILE".dpkg-obsolete
        fi
    fi
}

case "$1" in
    install|upgrade)
    	# if the /etc/dhclient.conf from dhcp-client was modified, 
	# bring it forward to /etc/dhcp3/dhclient.conf, but in a way not
	# to upset dpkg about a changed conffile
        if [ ! -e /etc/dhcp3/dhclient.conf ] && [ -e /etc/dhclient.conf ] && \
	    ! >/dev/null 2>&1 md5sum -c - <<-EOF; then
		10830c7543724cfd36f10dd87a5f98eb  /etc/dhclient.conf
		EOF
		mkdir -p /etc/dhcp3
		cp /etc/dhclient.conf /etc/dhcp3/dhclient.conf.oldconfig
        fi

	# We renamed debug-enter to debug - handle the transition
	if [ ! -e /etc/dhcp3/dhclient-enter-hooks.d/debug ] && \
	      [ -e /etc/dhcp3/dhclient-enter-hooks.d/debug-enter ]; then
		mv /etc/dhcp3/dhclient-enter-hooks.d/debug-enter \
		   /etc/dhcp3/dhclient-enter-hooks.d/debug
	else
	    rm -f /etc/dhcp3/dhclient-enter-hooks.d/debug-enter
	fi

	# We renamed debug-exit to debug - handle the transition
	if [ ! -e /etc/dhcp3/dhclient-exit-hooks.d/debug ] && \
	      [ -e /etc/dhcp3/dhclient-exit-hooks.d/debug-exit ]; then
		mv /etc/dhcp3/dhclient-exit-hooks.d/debug-exit \
		   /etc/dhcp3/dhclient-exit-hooks.d/debug
	else
	    rm -f /etc/dhcp3/dhclient-exit-hooks.d/debug-exit
	fi

	# We moved /etc/dhcp3/dhclient-script to /sbin in 3.0.4-2
	if dpkg --compare-versions "$2" lt-nl "3.0.4-2"; then
		if [ -e /etc/dhcp3/dhclient-script ]; then
			if >/dev/null 2>&1 md5sum -c - <<-EOF; then
			2b18b5c59b26d00aa115716b3da2ed26  /etc/dhcp3/dhclient-script
			EOF
				rm -f /etc/dhcp3/dhclient-script
			fi
		fi
	fi

	if dpkg --compare-versions "$2" lt-nl 3.1.2-1ubuntu7; then
		prep_rm_conffile dhcp3-client /etc/network/if-pre-up.d/dhclient3-apparmor
	fi

        ;;

    abort-upgrade)
        ;;

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

APP_PROFILE="sbin.dhclient3"
APP_CONFFILE="/etc/apparmor.d/$APP_PROFILE"
APP_COMPLAIN="/etc/apparmor.d/force-complain/$APP_PROFILE"
if [ "$1" = "upgrade" ]; then
    mkdir -p `dirname $APP_COMPLAIN` 2>/dev/null || true
    if dpkg --compare-versions $2 lt "3.0.4-12ubuntu4" ; then
        # force-complain for pre-apparmor upgrades
        ln -sf $APP_CONFFILE $APP_COMPLAIN
    fi
fi

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.



exit 0