#!/bin/sh -e
# This script can be called in the following ways:
#
# Before the package is installed:
#	<new-preinst> install
#
# Before removed package is upgraded:
#	<new-preinst> install <old-version>
#
# Before the package is upgraded:
#	<new-preinst> upgrade <old-version>
#
#
# If postrm fails during upgrade or fails on failed upgrade:
#	<old-preinst> abort-upgrade <new-version>


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

    if [ -e "$CONFFILE" ]; then
        md5sum="`md5sum \"$CONFFILE\" | sed -e \"s/ .*//\"`"
        old_md5sum="`sed -n -e \"/^Conffiles:/,/^[^ ]/{\\\\' $CONFFILE '{s/ obsolete$//;s/.* //;p}}\" /var/lib/dpkg/status`"
        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
}

# Prepare to move a conffile without triggering a dpkg question
prep_mv_conffile() {
    CONFFILE="$1"

    if [ -e "$CONFFILE" ]; then
        md5sum="`md5sum \"$CONFFILE\" | sed -e \"s/ .*//\"`"
        old_md5sum="`sed -n -e \"/^Conffiles:/,/^[^ ]/{\\\\' $CONFFILE '{s/ obsolete$//;s/.* //;p}}\" /var/lib/dpkg/status`"
        if [ "$md5sum" = "$old_md5sum" ]; then
            mv -f "$CONFFILE" "$CONFFILE".dpkg-bak
	else
            mv -f "$CONFFILE" "$CONFFILE".dpkg-moving
        fi
    fi
}


# Disable udevadm from being run during an upgrade
disable_udevadm()
{
    dpkg-divert --local --rename --divert /sbin/udevadm.upgrade \
    		--add /sbin/udevadm

    cat <<'UDEVADM' > /sbin/udevadm
#!/bin/sh

if [ "${0##*/}" = "udevtrigger" ] || [ "$1" = "trigger" ]; then
    echo "udevadm trigger is not permitted while udev is unconfigured." 1>&2
    exit 1
fi

if [ "${0##*/}" = "udevsettle" ] || [ "$1" = "settle" ]; then
    echo "udevadm settle is not permitted while udev is unconfigured." 1>&2
    exit 1
fi

exec /bin/bash -c "exec -a \"\$0\" /sbin/udevadm.upgrade \"\$@\"" "$0" "$@"
UDEVADM
    chmod +x /sbin/udevadm
}


# Prepare to remove Ubuntu rules in favour of upstream ones
prep_rm_ubuntu_rules()
{
    prep_rm_conffile /etc/udev/rules.d/05-options.rules
    prep_rm_conffile /etc/udev/rules.d/05-udev-early.rules
    prep_rm_conffile /etc/udev/rules.d/20-names.rules
    prep_rm_conffile /etc/udev/rules.d/30-cdrom_id.rules
    prep_rm_conffile /etc/udev/rules.d/40-basic-permissions.rules
    prep_rm_conffile /etc/udev/rules.d/40-permissions.rules
    prep_rm_conffile /etc/udev/rules.d/60-persistent-input.rules
    prep_rm_conffile /etc/udev/rules.d/60-persistent-storage-tape.rules
    prep_rm_conffile /etc/udev/rules.d/60-persistent-storage.rules
    prep_rm_conffile /etc/udev/rules.d/60-symlinks.rules
    prep_rm_conffile /etc/udev/rules.d/61-persistent-storage-edd.rules
    prep_rm_conffile /etc/udev/rules.d/65-id-type.rules
    prep_rm_conffile /etc/udev/rules.d/66-persistent-storage-edd.rules
    prep_rm_conffile /etc/udev/rules.d/75-cd-aliases-generator.rules
    prep_rm_conffile /etc/udev/rules.d/75-persistent-net-generator.rules
    prep_rm_conffile /etc/udev/rules.d/80-programs.rules
    prep_rm_conffile /etc/udev/rules.d/90-modprobe.rules
    prep_rm_conffile /etc/udev/rules.d/95-udev-late.rules
}


case "$1" in
    install|upgrade)
    	disable_udevadm

	# Upgrade from intrepid
	if dpkg --compare-versions "$2" lt "136-4"; then
	    prep_rm_ubuntu_rules
	fi

	# Upgrade from jaunty
	if dpkg --compare-versions "$2" lt "143-3"; then
	    prep_rm_conffile /etc/scsi_id.config
	fi
	;;

    abort-upgrade)
	;;

    *)
	echo "$0 called with unknown argument \`$1'" 1>&2
	exit 1
	;;
esac

# Automatically added by dh_installinit
if [ "$1" = install ] || [ "$1" = upgrade ]; then
	if [ -e "/etc/init.d/udev" ] && [ ! -L "/etc/init.d/udev" ]; then
		if [ "`md5sum \"/etc/init.d/udev\" | sed -e \"s/ .*//\"`" != \
		     "`dpkg-query -W -f='${Conffiles}' udev | sed -n -e \"\\\\' /etc/init.d/udev '{s/ obsolete$//;s/.* //p}\"`" ]
		then
			echo "Obsolete conffile /etc/init.d/udev has been modified by you, renaming to .dpkg-bak"
			mv -f "/etc/init.d/udev" "/etc/init.d/udev.dpkg-bak"
		else
			rm -f "/etc/init.d/udev"
		fi
	fi
fi
# End automatically added section
# Automatically added by dh_installinit
if [ "$1" = install ] || [ "$1" = upgrade ]; then
	if [ -e "/etc/init.d/udev-finish" ] && [ ! -L "/etc/init.d/udev-finish" ]; then
		if [ "`md5sum \"/etc/init.d/udev-finish\" | sed -e \"s/ .*//\"`" != \
		     "`dpkg-query -W -f='${Conffiles}' udev | sed -n -e \"\\\\' /etc/init.d/udev-finish '{s/ obsolete$//;s/.* //p}\"`" ]
		then
			echo "Obsolete conffile /etc/init.d/udev-finish has been modified by you, renaming to .dpkg-bak"
			mv -f "/etc/init.d/udev-finish" "/etc/init.d/udev-finish.dpkg-bak"
		else
			rm -f "/etc/init.d/udev-finish"
		fi
	fi
fi
# End automatically added section

exit 0