#! /bin/sh
#
# /usr/share/dahdi/dahdi_handle_device
#
# Called by UDEV when a dahdi device is added/removed
#

me=`basename $0`
dir=`dirname $0`
LOGGER="logger -i -t '$me'"
NAME=`basename "$DEVPATH" | tr -c 'A-Za-z0-9-' '_'`

# Always redirect stderr somewhere, otherwise the shell script will die
# when it tries to do I/O related stuff on closed file descriptor.
# Our default is to throw it down the bit-bucket.
exec 2> /dev/null
# If you wish to trace this script:
#exec 2> "/tmp/${me}.$NAME" 1>&2
#exec 2> /dev/console

# Our directory in the beginning, so we can use local lab setup
PATH="$dir:/usr/sbin:/sbin:/usr/bin:/bin"

set -e

#echo >&2 "$0($ACTION): DEBUG($# args): '$*'"

# Do we have a configuration?
if [ -f /etc/dahdi/init.conf ]; then
	. /etc/dahdi/init.conf
fi

if [ "$DAHDI_UDEV_DISABLE_DEVICES" = 'yes' ]; then
	echo "DAHDI_UDEV_DISABLE_DEVICES=yes. Skip $DEVPATH" | $LOGGER
	exit 0
fi

# Can we pass a different value so we can use
# alternate (testing) configuration?
# Meanwhile, make it hard-coded.
DAHDICONFDIR='/etc/dahdi'
export DAHDICONFDIR

case "$ACTION" in
add)
	echo "$ACTION: $DEVPATH" | $LOGGER

	# Check if we can safely do our job
	if [ ! -f /sys/module/dahdi/parameters/auto_assign_spans ]; then
		if [ -f /sys/module/dahdi ]; then
			$LOGGER "Old driver (no auto_assign_spans parameter). Skip $DEVPATH"
			exit 0
		fi
	fi
	if [ `cat /sys/module/dahdi/parameters/auto_assign_spans` -eq 1 ]; then
		echo "auto_assign_spans=1. Skip $DEVPATH" | $LOGGER
		exit 0
	fi

	# Can have alternate dahdi configuration directory for debugging
	# export DAHDICONFDIR="/tmp/xortel/dahdi"

	# Don't block udev for too long
	(
		if [ -r "$DAHDICONFDIR/span-types.conf" ]; then
			dahdi_span_types set "/sys$DEVPATH"
		fi
		if [ -r "$DAHDICONFDIR/assigned-spans.conf" ]; then
			dahdi_span_assignments add "/sys$DEVPATH"
		else
			# No configuration. No order guaranteed
			dahdi_span_assignments auto "/sys$DEVPATH"
		fi
	) 2>&1 < /dev/null | $LOGGER &
	;;
remove)
	# Nothing to do yet...
	echo "$ACTION: $DEVPATH" | $LOGGER
	;;
*)
	echo "UNHANDLED: $ACTION: $DEVPATH" | $LOGGER
	;;
esac