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/usr/lib/neard/tools/bt-handover is in neard-tools 0.16-0.1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/usr/bin/python

import os
import sys
import gobject

import dbus
import dbus.mainloop.glib
from optparse import OptionParser
import neardutils

from dbus.lowlevel import MethodCallMessage, HANDLER_RESULT_NOT_YET_HANDLED

mainloop = gobject.MainLoop()

def device_added(path, interfaces):
	for iface, props in interfaces.iteritems():
		if "org.neard.Device" in interfaces:
			print("Pairing with %s" % (path))
			device = dbus.Interface(bus.get_object("org.neard", path),
							"org.neard.Device")
			device.Push(({ "Type" : "Handover", "Carrier" : "bluetooth"}))
			break

def device_removed(path, interfaces):
	for iface in interfaces:
		if "org.neard.Device" in interfaces:
			print("Lost device %s" % (path))
			mainloop.quit()
			break

def remove_paired_devices(bt_adapter):
	manager = dbus.Interface(bus.get_object("org.bluez", "/"),
					"org.freedesktop.DBus.ObjectManager")
	objects = manager.GetManagedObjects()

	all_adapters = (path for path, interfaces in objects.iteritems() if
				"org.bluez.Adapter1" in interfaces.keys()
				and path.endswith(bt_adapter))

	bluez_adapter = None
	for adapter in sorted(all_adapters):
		bluez_adapter = dbus.Interface(bus.get_object("org.bluez",
							adapter),
							"org.bluez.Adapter1")
		break

	if(bluez_adapter is None):
		print("Bluetooth adapter %s could not be found" % bluez_adapter)
		exit()

	adapter_path = bluez_adapter.object_path
	print("Using %s" % adapter_path)

	adapter_props = dbus.Interface(bus.get_object("org.bluez", adapter_path),
					"org.freedesktop.DBus.Properties")

	powered = adapter_props.Get("org.bluez.Adapter1", "Powered")
	if (powered == dbus.Boolean(0)):
		print("Bluetooth adapter %s is not powered" % adapter_path )
		exit()

	all_devices = (path for path, interfaces in objects.iteritems() if
				("org.bluez.Device1" in interfaces.keys()
				and path.startswith(bluez_adapter.object_path)))

	for device in all_devices:
		print("Removing %s" % (device))
		bluez_adapter.RemoveDevice(device)

def remove_paired_devices_bluez4():
	bluez_manager = dbus.Interface(bus.get_object("org.bluez", "/"),
					"org.bluez.Manager")

	bluez_adapter_path = bluez_manager.DefaultAdapter()
	bluez_adapter = dbus.Interface(bus.get_object("org.bluez",
						bluez_adapter_path),
						"org.bluez.Adapter")

	print("Using %s" % bluez_adapter.object_path)

	for bluez_path in bluez_adapter.ListDevices():
		print("Removing %s" % (bluez_path))
		bluez_adapter.RemoveDevice(bluez_path)

if __name__ == '__main__':
	parser = OptionParser()
	parser.add_option("", "--bluez4", action="store_true",
				dest="use_bluez4",
				help="Use BlueZ 4 to remove paired devices.")
	parser.add_option("-a", "--adapter", metavar="BT_ADAPTER",
				dest="bt_adapter", default="",
				help="The bluetooth adapter that is used by "
					"the bluetooth stack. This options is "
					"ignored when using BlueZ 4, instead "
					"the default adapter is used.")
	(options, args) = parser.parse_args()

	dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)

	bus = dbus.SystemBus()

	adapter_path = neardutils.find_adapter().object_path
	print("Adapter path %s" % (adapter_path))
	adapter = dbus.Interface(bus.get_object("org.neard", adapter_path),
							"org.neard.Adapter")

	adapter_props = dbus.Interface(bus.get_object("org.neard", adapter_path),
					"org.freedesktop.DBus.Properties")
	powered = adapter_props.Get("org.neard.Adapter", "Powered")
	if (powered == dbus.Boolean(0)):
		adapter_props.Set("org.neard.Adapter", "Powered", dbus.Boolean(1))

	if (options.use_bluez4):
		remove_paired_devices_bluez4()
	else:
		remove_paired_devices(options.bt_adapter)

	polling = adapter_props.Get("org.neard.Adapter", "Polling")
	if (polling == dbus.Boolean(0)):
		adapter.StartPollLoop("Initiator")

	bus.add_signal_receiver(device_added, bus_name="org.neard",
			dbus_interface="org.freedesktop.DBus.ObjectManager",
			signal_name="InterfacesAdded")

	bus.add_signal_receiver(device_removed, bus_name="org.neard",
			dbus_interface="org.freedesktop.DBus.ObjectManager",
			signal_name="InterfacesRemoved")

	mainloop.run()