Remove --daemon and --pid-file option from __main__.py (#64345)

* Remove --pid-file option from __main__.py

* Remove --daemon option from __main__.py

homeassistant/__main__.py

@@ -90,12 +90,6 @@ def get_arguments() -> argparse.Namespace:
     parser.add_argument(
         "-v", "--verbose", action="store_true", help="Enable verbose logging to file."
     )
-    parser.add_argument(
-        "--pid-file",
-        metavar="path_to_pid_file",
-        default=None,
-        help="Path to PID file useful for running as daemon",
-    )
     parser.add_argument(
         "--log-rotate-days",
         type=int,
@@ -119,76 +113,12 @@ def get_arguments() -> argparse.Namespace:
     parser.add_argument(
         "--script", nargs=argparse.REMAINDER, help="Run one of the embedded scripts"
     )
-    if os.name == "posix":
-        parser.add_argument(
-            "--daemon", action="store_true", help="Run Home Assistant as daemon"
-        )
 
     arguments = parser.parse_args()
-    if os.name != "posix" or arguments.debug or arguments.runner:
-        setattr(arguments, "daemon", False)
 
     return arguments
 
 
-def daemonize() -> None:
-    """Move current process to daemon process."""
-    # Create first fork
-    if os.fork() > 0:
-        sys.exit(0)
-
-    # Decouple fork
-    os.setsid()
-
-    # Create second fork
-    if os.fork() > 0:
-        sys.exit(0)
-
-    # redirect standard file descriptors to devnull
-    # pylint: disable=consider-using-with
-    infd = open(os.devnull, encoding="utf8")
-    outfd = open(os.devnull, "a+", encoding="utf8")
-    sys.stdout.flush()
-    sys.stderr.flush()
-    os.dup2(infd.fileno(), sys.stdin.fileno())
-    os.dup2(outfd.fileno(), sys.stdout.fileno())
-    os.dup2(outfd.fileno(), sys.stderr.fileno())
-
-
-def check_pid(pid_file: str) -> None:
-    """Check that Home Assistant is not already running."""
-    # Check pid file
-    try:
-        with open(pid_file, encoding="utf8") as file:
-            pid = int(file.readline())
-    except OSError:
-        # PID File does not exist
-        return
-
-    # If we just restarted, we just found our own pidfile.
-    if pid == os.getpid():
-        return
-
-    try:
-        os.kill(pid, 0)
-    except OSError:
-        # PID does not exist
-        return
-    print("Fatal Error: Home Assistant is already running.")
-    sys.exit(1)
-
-
-def write_pid(pid_file: str) -> None:
-    """Create a PID File."""
-    pid = os.getpid()
-    try:
-        with open(pid_file, "w", encoding="utf8") as file:
-            file.write(str(pid))
-    except OSError:
-        print(f"Fatal Error: Unable to write pid file {pid_file}")
-        sys.exit(1)
-
-
 def closefds_osx(min_fd: int, max_fd: int) -> None:
     """Make sure file descriptors get closed when we restart.
 
@@ -213,11 +143,9 @@ def cmdline() -> list[str]:
     if os.path.basename(sys.argv[0]) == "__main__.py":
         modulepath = os.path.dirname(sys.argv[0])
         os.environ["PYTHONPATH"] = os.path.dirname(modulepath)
-        return [sys.executable, "-m", "homeassistant"] + [
-            arg for arg in sys.argv[1:] if arg != "--daemon"
-        ]
+        return [sys.executable, "-m", "homeassistant"] + list(sys.argv[1:])
 
-    return [arg for arg in sys.argv if arg != "--daemon"]
+    return sys.argv
 
 
 def try_to_restart() -> None:
@@ -277,14 +205,6 @@ def main() -> int:
     config_dir = os.path.abspath(os.path.join(os.getcwd(), args.config))
     ensure_config_path(config_dir)
 
-    # Daemon functions
-    if args.pid_file:
-        check_pid(args.pid_file)
-    if args.daemon:
-        daemonize()
-    if args.pid_file:
-        write_pid(args.pid_file)
-
     # pylint: disable=import-outside-toplevel
     from . import runner