375 lines
11 KiB
Python
375 lines
11 KiB
Python
"""Start Home Assistant."""
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from __future__ import print_function
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import argparse
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import os
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import platform
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import subprocess
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import sys
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import threading
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from typing import Optional, List
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from homeassistant import monkey_patch
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from homeassistant.const import (
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__version__,
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EVENT_HOMEASSISTANT_START,
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REQUIRED_PYTHON_VER,
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REQUIRED_PYTHON_VER_WIN,
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RESTART_EXIT_CODE,
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)
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def attempt_use_uvloop():
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"""Attempt to use uvloop."""
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import asyncio
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try:
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import uvloop
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asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
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except ImportError:
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pass
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def validate_python() -> None:
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"""Validate that the right Python version is running."""
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if sys.platform == "win32" and \
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sys.version_info[:3] < REQUIRED_PYTHON_VER_WIN:
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print("Home Assistant requires at least Python {}.{}.{}".format(
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*REQUIRED_PYTHON_VER_WIN))
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sys.exit(1)
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elif sys.version_info[:3] < REQUIRED_PYTHON_VER:
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print("Home Assistant requires at least Python {}.{}.{}".format(
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*REQUIRED_PYTHON_VER))
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sys.exit(1)
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def ensure_config_path(config_dir: str) -> None:
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"""Validate the configuration directory."""
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import homeassistant.config as config_util
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lib_dir = os.path.join(config_dir, 'deps')
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# Test if configuration directory exists
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if not os.path.isdir(config_dir):
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if config_dir != config_util.get_default_config_dir():
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print(('Fatal Error: Specified configuration directory does '
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'not exist {} ').format(config_dir))
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sys.exit(1)
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try:
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os.mkdir(config_dir)
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except OSError:
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print(('Fatal Error: Unable to create default configuration '
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'directory {} ').format(config_dir))
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sys.exit(1)
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# Test if library directory exists
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if not os.path.isdir(lib_dir):
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try:
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os.mkdir(lib_dir)
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except OSError:
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print(('Fatal Error: Unable to create library '
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'directory {} ').format(lib_dir))
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sys.exit(1)
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def ensure_config_file(config_dir: str) -> str:
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"""Ensure configuration file exists."""
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import homeassistant.config as config_util
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config_path = config_util.ensure_config_exists(config_dir)
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if config_path is None:
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print('Error getting configuration path')
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sys.exit(1)
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return config_path
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def get_arguments() -> argparse.Namespace:
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"""Get parsed passed in arguments."""
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import homeassistant.config as config_util
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parser = argparse.ArgumentParser(
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description="Home Assistant: Observe, Control, Automate.")
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parser.add_argument('--version', action='version', version=__version__)
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parser.add_argument(
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'-c', '--config',
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metavar='path_to_config_dir',
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default=config_util.get_default_config_dir(),
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help="Directory that contains the Home Assistant configuration")
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parser.add_argument(
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'--demo-mode',
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action='store_true',
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help='Start Home Assistant in demo mode')
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parser.add_argument(
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'--debug',
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action='store_true',
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help='Start Home Assistant in debug mode')
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parser.add_argument(
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'--open-ui',
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action='store_true',
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help='Open the webinterface in a browser')
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parser.add_argument(
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'--skip-pip',
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action='store_true',
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help='Skips pip install of required packages on startup')
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parser.add_argument(
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'-v', '--verbose',
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action='store_true',
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help="Enable verbose logging to file.")
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parser.add_argument(
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'--pid-file',
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metavar='path_to_pid_file',
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default=None,
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help='Path to PID file useful for running as daemon')
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parser.add_argument(
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'--log-rotate-days',
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type=int,
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default=None,
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help='Enables daily log rotation and keeps up to the specified days')
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parser.add_argument(
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'--log-file',
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type=str,
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default=None,
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help='Log file to write to. If not set, CONFIG/home-assistant.log '
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'is used')
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parser.add_argument(
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'--runner',
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action='store_true',
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help='On restart exit with code {}'.format(RESTART_EXIT_CODE))
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parser.add_argument(
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'--script',
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nargs=argparse.REMAINDER,
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help='Run one of the embedded scripts')
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if os.name == "posix":
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parser.add_argument(
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'--daemon',
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action='store_true',
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help='Run Home Assistant as daemon')
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arguments = parser.parse_args()
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if os.name != "posix" or arguments.debug or arguments.runner:
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setattr(arguments, 'daemon', False)
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return arguments
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def daemonize() -> None:
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"""Move current process to daemon process."""
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# Create first fork
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pid = os.fork()
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if pid > 0:
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sys.exit(0)
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# Decouple fork
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os.setsid()
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# Create second fork
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pid = os.fork()
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if pid > 0:
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sys.exit(0)
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# redirect standard file descriptors to devnull
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infd = open(os.devnull, 'r')
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outfd = open(os.devnull, 'a+')
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sys.stdout.flush()
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sys.stderr.flush()
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os.dup2(infd.fileno(), sys.stdin.fileno())
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os.dup2(outfd.fileno(), sys.stdout.fileno())
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os.dup2(outfd.fileno(), sys.stderr.fileno())
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def check_pid(pid_file: str) -> None:
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"""Check that Home Assistant is not already running."""
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# Check pid file
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try:
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pid = int(open(pid_file, 'r').readline())
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except IOError:
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# PID File does not exist
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return
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# If we just restarted, we just found our own pidfile.
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if pid == os.getpid():
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return
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try:
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os.kill(pid, 0)
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except OSError:
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# PID does not exist
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return
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print('Fatal Error: HomeAssistant is already running.')
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sys.exit(1)
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def write_pid(pid_file: str) -> None:
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"""Create a PID File."""
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pid = os.getpid()
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try:
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open(pid_file, 'w').write(str(pid))
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except IOError:
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print('Fatal Error: Unable to write pid file {}'.format(pid_file))
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sys.exit(1)
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def closefds_osx(min_fd: int, max_fd: int) -> None:
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"""Make sure file descriptors get closed when we restart.
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We cannot call close on guarded fds, and we cannot easily test which fds
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are guarded. But we can set the close-on-exec flag on everything we want to
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get rid of.
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"""
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from fcntl import fcntl, F_GETFD, F_SETFD, FD_CLOEXEC
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for _fd in range(min_fd, max_fd):
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try:
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val = fcntl(_fd, F_GETFD)
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if not val & FD_CLOEXEC:
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fcntl(_fd, F_SETFD, val | FD_CLOEXEC)
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except IOError:
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pass
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def cmdline() -> List[str]:
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"""Collect path and arguments to re-execute the current hass instance."""
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if sys.argv[0].endswith(os.path.sep + '__main__.py'):
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modulepath = os.path.dirname(sys.argv[0])
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os.environ['PYTHONPATH'] = os.path.dirname(modulepath)
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return [sys.executable] + [arg for arg in sys.argv if
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arg != '--daemon']
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return [arg for arg in sys.argv if arg != '--daemon']
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def setup_and_run_hass(config_dir: str,
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args: argparse.Namespace) -> Optional[int]:
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"""Set up HASS and run."""
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from homeassistant import bootstrap
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# Run a simple daemon runner process on Windows to handle restarts
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if os.name == 'nt' and '--runner' not in sys.argv:
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nt_args = cmdline() + ['--runner']
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while True:
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try:
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subprocess.check_call(nt_args)
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sys.exit(0)
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except subprocess.CalledProcessError as exc:
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if exc.returncode != RESTART_EXIT_CODE:
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sys.exit(exc.returncode)
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if args.demo_mode:
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config = {
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'frontend': {},
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'demo': {}
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}
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hass = bootstrap.from_config_dict(
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config, config_dir=config_dir, verbose=args.verbose,
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skip_pip=args.skip_pip, log_rotate_days=args.log_rotate_days,
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log_file=args.log_file)
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else:
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config_file = ensure_config_file(config_dir)
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print('Config directory:', config_dir)
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hass = bootstrap.from_config_file(
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config_file, verbose=args.verbose, skip_pip=args.skip_pip,
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log_rotate_days=args.log_rotate_days, log_file=args.log_file)
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if hass is None:
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return None
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if args.open_ui:
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# Imported here to avoid importing asyncio before monkey patch
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from homeassistant.util.async import run_callback_threadsafe
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def open_browser(event):
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"""Open the webinterface in a browser."""
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if hass.config.api is not None:
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import webbrowser
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webbrowser.open(hass.config.api.base_url)
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run_callback_threadsafe(
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hass.loop,
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hass.bus.async_listen_once,
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EVENT_HOMEASSISTANT_START, open_browser
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)
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return hass.start()
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def try_to_restart() -> None:
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"""Attempt to clean up state and start a new Home Assistant instance."""
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# Things should be mostly shut down already at this point, now just try
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# to clean up things that may have been left behind.
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sys.stderr.write('Home Assistant attempting to restart.\n')
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# Count remaining threads, ideally there should only be one non-daemonized
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# thread left (which is us). Nothing we really do with it, but it might be
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# useful when debugging shutdown/restart issues.
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try:
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nthreads = sum(thread.is_alive() and not thread.daemon
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for thread in threading.enumerate())
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if nthreads > 1:
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sys.stderr.write(
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"Found {} non-daemonic threads.\n".format(nthreads))
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# Somehow we sometimes seem to trigger an assertion in the python threading
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# module. It seems we find threads that have no associated OS level thread
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# which are not marked as stopped at the python level.
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except AssertionError:
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sys.stderr.write("Failed to count non-daemonic threads.\n")
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# Try to not leave behind open filedescriptors with the emphasis on try.
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try:
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max_fd = os.sysconf("SC_OPEN_MAX")
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except ValueError:
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max_fd = 256
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if platform.system() == 'Darwin':
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closefds_osx(3, max_fd)
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else:
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os.closerange(3, max_fd)
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# Now launch into a new instance of Home Assistant. If this fails we
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# fall through and exit with error 100 (RESTART_EXIT_CODE) in which case
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# systemd will restart us when RestartForceExitStatus=100 is set in the
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# systemd.service file.
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sys.stderr.write("Restarting Home Assistant\n")
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args = cmdline()
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os.execv(args[0], args)
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def main() -> int:
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"""Start Home Assistant."""
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validate_python()
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if os.environ.get('HASS_NO_MONKEY') != '1':
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if sys.version_info[:2] >= (3, 6):
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monkey_patch.disable_c_asyncio()
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monkey_patch.patch_weakref_tasks()
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attempt_use_uvloop()
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args = get_arguments()
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if args.script is not None:
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from homeassistant import scripts
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return scripts.run(args.script)
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config_dir = os.path.join(os.getcwd(), args.config)
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ensure_config_path(config_dir)
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# Daemon functions
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if args.pid_file:
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check_pid(args.pid_file)
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if args.daemon:
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daemonize()
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if args.pid_file:
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write_pid(args.pid_file)
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exit_code = setup_and_run_hass(config_dir, args)
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if exit_code == RESTART_EXIT_CODE and not args.runner:
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try_to_restart()
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return exit_code
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if __name__ == "__main__":
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sys.exit(main())
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