tuhi/tools/tuhi-live.py

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#!/usr/bin/env python3
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
import argparse
import logging
import os
import pwd
import sys
import multiprocessing
from multiprocessing import reduction
manager = None
logger = None
def open_uhid_process(queue_in, conn_out):
while True:
try:
pid = queue_in.get()
except KeyboardInterrupt:
return 0
else:
fd = os.open('/dev/uhid', os.O_RDWR)
reduction.send_handle(conn_out, fd, pid)
def maybe_start_tuhi(queue):
sys.path
try:
should_start, verbose = queue.get()
except KeyboardInterrupt:
return 0
if not should_start:
return
sys.path.append(os.getcwd())
import tuhi.base
if verbose:
tuhi.base.logger.setLevel(logging.DEBUG)
t = tuhi.base.Tuhi()
while True:
try:
t.run()
except KeyboardInterrupt:
pass
def start_tuhi_server(args):
queue = multiprocessing.Queue()
tuhi_process = multiprocessing.Process(target=maybe_start_tuhi, args=(queue,))
tuhi_process.daemon = True
tuhi_process.start()
sys.path.append(os.path.join(os.getcwd(), 'tools'))
# import after spawning the process, or the 2 processes will fight for GLib
import kete
from gi.repository import Gio, GLib
global logger
logger = logging.getLogger('tuhi-live')
logger.addHandler(kete.logger_handler)
logger.setLevel(logging.INFO)
logger.debug('connecting to the bus')
# connect to the session
try:
connection = Gio.bus_get_sync(Gio.BusType.SESSION, None)
except GLib.Error as e:
if (e.domain == 'g-io-error-quark' and
e.code == Gio.IOErrorEnum.DBUS_ERROR):
raise kete.DBusError(e.message)
else:
raise e
logger.debug('looking for tuhi on the bus')
# attempt to connect to tuhi
try:
proxy = Gio.DBusProxy.new_sync(connection,
Gio.DBusProxyFlags.NONE, None,
kete.TUHI_DBUS_NAME,
kete.ROOT_PATH,
kete.ORG_FREEDESKTOP_TUHI1_MANAGER,
None)
except GLib.Error as e:
if (e.domain == 'g-io-error-quark' and
e.code == Gio.IOErrorEnum.DBUS_ERROR):
raise kete.DBusError(e.message)
else:
raise e
started = proxy.get_name_owner() is not None
if not started:
print(f'No-one is handling {kete.TUHI_DBUS_NAME}, attempting to start a daemon')
queue.put((not started, args.verbose))
def run_live(request_fd_queue, conn_fd):
import kete
from gi.repository import Gio, GLib
def on_name_appeared(connection, name, client):
global manager
logger.info('Connected to the Tuhi daemon')
manager = kete.TuhiKeteManager()
for device in manager.devices:
logger.info(f'starting live on {device}, please press button on the device')
request_fd_queue.put(os.getpid())
fd = reduction.recv_handle(conn_fd)
device.start_live(fd)
Gio.bus_watch_name(Gio.BusType.SESSION,
kete.TUHI_DBUS_NAME,
Gio.BusNameWatcherFlags.NONE,
on_name_appeared,
None)
mainloop = GLib.MainLoop()
connected_devices = 0
def on_disconnect(dev, pspec):
mainloop.quit()
wait_for_disconnect = False
try:
mainloop.run()
except KeyboardInterrupt:
pass
finally:
for device in manager.devices:
if device.live:
connected_devices += 1
for device in manager.devices:
if device.live and device.connected:
logger.info(f'stopping live on {device}')
device.connect('notify::connected', on_disconnect)
device.stop_live()
wait_for_disconnect = True
# we re-run the mainloop to terminate the connections
if wait_for_disconnect:
try:
mainloop.run()
except KeyboardInterrupt:
pass
def drop_privileges():
sys.stderr.write('dropping privileges\n')
os.setgroups([])
gid = int(os.getenv('SUDO_GID'))
uid = int(os.getenv('SUDO_UID'))
pwname = os.getenv('SUDO_USER')
os.setresgid(gid, gid, gid)
os.initgroups(pwname, gid)
os.setresuid(uid, uid, uid)
pw = pwd.getpwuid(uid)
# we completely clear the environment and start a new and controlled one
os.environ.clear()
os.environ['XDG_RUNTIME_DIR'] = f'/run/user/{uid}'
os.environ['HOME'] = pw.pw_dir
def parse(args):
desc = 'tool to start the live mode on all devices tuhi knows about'
parser = argparse.ArgumentParser(description=desc)
parser.add_argument('-v', '--verbose',
help='Show some debugging informations',
action='store_true',
default=False)
return parser.parse_args(args[1:])
def main(args=sys.argv):
if not os.geteuid() == 0:
sys.exit('Script must be run as root')
args = parse(args)
request_fd_queue = multiprocessing.Queue()
conn_in, conn_out = multiprocessing.Pipe()
fd_process = multiprocessing.Process(target=open_uhid_process, args=(request_fd_queue, conn_out))
fd_process.daemon = True
fd_process.start()
drop_privileges()
start_tuhi_server(args)
run_live(request_fd_queue, conn_in)
if __name__ == '__main__':
main(sys.argv)